CN100357086C - Production of PE piping materials with thick wall - Google Patents
Production of PE piping materials with thick wall Download PDFInfo
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- CN100357086C CN100357086C CNB2005100448841A CN200510044884A CN100357086C CN 100357086 C CN100357086 C CN 100357086C CN B2005100448841 A CNB2005100448841 A CN B2005100448841A CN 200510044884 A CN200510044884 A CN 200510044884A CN 100357086 C CN100357086 C CN 100357086C
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- wall
- wall pipe
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention respectively improves devices and technologies from the following aspects on the base of the existing pipe material extrusion devices and technologies: (1) the improvement of a mould: the gap of the mouth mould is 1 to 1.05 times than the thickness of a pipe blank; the internal diameter dimension of a sizing sleeve is 0.98 to 1 time than that of the mouth mould of a machine head to ensure the formation of vacuum degree; (2) the improvement of a cutting scheme: a planet cutting saw is not changed; after a section of thick-wall pipe is produced, a section of thin-wall pipe is intermittently produced when the thick-wall pipe is produced; the thick-wall pipe is precut into small sections on the production line of the pipe material; then, the small sections are further cut on a horizontal saw mill according to the processing requirements of a pipe fitting; (3) the improvement of a processing technology: an extruder is started to extrude material blanks; aged layers on the surfaces of drawing pipe ends are removed; preheating time is determined. After the unit weight of the pipe blank is set, the extruder is started to gradually enhance extrusion speed to proper yield. A water pump of a vacuum tank, and a vacuum pump are opened to adjust vacuum degree when the material blanks enter the sizing sleeve; a thick-wall pipe blank is started to be produced. A 0.5m thin-wall pipe is produced before the length of the thick-wall pipe is set so as to be good for the on-line cutting of the thick-wall pipe. Large-caliber pipe fittings made by the thick-wall pipe produced by the technology have stable and reliable quality, conform to the design criterions of plastic pipelines, and has wide market application prospect.
Description
One, technical field: the present invention relates to a kind of PE thick-wall tube production technology.
Two, background technology: in PE pipeline field, pipe fittings such as the main fingering orchid of used connecting tube, reducing, threeway, steel-plastic joint, ball valve, small-bore pipe fitting can be produced by Shooting Technique because itself is in light weight; And many products such as the pipe fitting of big specification such as flange, reducing, reducer tee, steel-plastic joint, ball valve are because complex structure, be difficult to produce by the weldering system, again because weight is big, as adopt Shooting Technique to produce, then need the investment of huge injection-moulding device and mould, do not reach in the market demand under the situation of economic flow rate, very uneconomical, technical also immature, all there is the shrinkage cavity problem that is difficult to overcome in the pipe fitting that now domestic some producer adopts Shooting Technique to produce the above bore of 500mm.
At present, the thickest of tubing extruding production line design is SDR11 (SDR is the ratio of a pipe diameter and wall thickness) standard series, and wall thickness still can't overcome greater than a lot of difficulties of tubing (as about PE heavy wall pipe SDR5) in production technology of SDR11 series.
Three, summary of the invention: purpose of the present invention is exactly on the basis of existing tube extruding equipment and technology, and extruder mould and expressing technique are improved, and makes full use of the machinability of plastics simultaneously and the PE thick-wall tube production technology sent out.
Technical scheme of the present invention is from the following aspects equipment and technology to be improved respectively on the basis of existing PE tubing extruding production line:
(1) improvement of mould: mouthful die clearance is 1-1.05 a times of pipe thickness, and the calibration sleeve internal diameter size is 0.98-1 a times of machine head port mould internal diameter, to guarantee the formation of vacuum; Near the gripper shoe cambered surface diameter of calibration sleeve be 1.05 times of calibration sleeve internal diameter, last gripper shoe cambered surface diameter is 1.03 times of tube outer diameter, intermediate support plate cambered surface size value changes between these two values step by step, and guarantees gripper shoe cambered surface bottom at grade.
(2) improvement of cutting scheme: the planet cast-cutting saw is not made any change, when producing thick-walled pipe, every production drive sleeve is interrupted produces one section light-wall pipe, on pipe production line thick-walled pipe is cut into segment in advance, further cuts according to the pipe fitting processing request on horizontal saw mill then.
(3) improvement of processing technology comprises: open extruder and extrude material base, remove the aging layer of traction tube end surfaces, pipe end is inserted preheating in the material base, determine preheating time, and good up to the joint welding.Start also improves extruded velocity gradually to optimum yield after setting the pipe substance, opens vacuum tank water pump and vavuum pump when material base enters calibration sleeve, adjusts vacuum, begins to produce the heavy wall pipe.In normal productive process, setting production 0.5m light-wall pipe between the thick-wall tube length, and carrying out cut mark at the thin place of wall, be beneficial to the online cutting of thick-walled pipe, produce 3.0～4.0m thin-wall pipes during shutdown, tubing is cooled off fully.
PE thick-wall tube production technology is that existing tubing extruding technology is improved.The heavy caliber pipe fitting steady quality that the thick-wall tube that uses this technology to produce is made is reliable, meet the plastic conduit design specification, obtained user's favorable comment in actual applications, auxiliary products as the PE plastic pipe, have market application foreground widely, filled up domestic heavy caliber PE heavy wall pipe blank.
Four, description of drawings: accompanying drawing is a main technique flow chart of the present invention.
Five, specific embodiment:
This PE thick-wall tube production technology is on the basis of existing PE tubing extruding production line, from the following aspects equipment and technology is improved respectively:
(1) improvement of mould
Because heavy wall pipe wall thickness is thicker,, should be not less than pipe thickness or big slightly by about 2～5% so mouthful die clearance is bigger than common tubing.Simultaneously, the calibration sleeve internal diameter size should or ratio mouth mould internal diameter slightly little about 1% formation with assurance vacuum consistent with the machine head port mould internal diameter.The gripper shoe cambered surface diameter of close calibration sleeve is 1.05 times of calibration sleeve internal diameter, last gripper shoe cambered surface diameter is 1.03 times of tube outer diameter, intermediate support plate cambered surface size value changes between these two values step by step, and guarantees gripper shoe cambered surface bottom at grade.
(2) improvement of cutting scheme
Since this technology can not the criterion of failure pipe production line integrality, the planet cast-cutting saw is not made any change, when producing thick-walled pipe, every production drive sleeve is interrupted produces one section light-wall pipe, on pipe production line, thick-walled pipe is cut into segment in advance, on horizontal saw mill, further cuts then according to the pipe fitting processing request.
(3) improvement of processing technology
In order to eliminate the uneven and minimizing tube wall internal stress of pipe thickness, tubing is extruded the melt temperature of processing and should be extruded output and be controlled at the floor level that hauling machine allows about 150 degree, is controlled at about 300kg/h as 125mm screw extruder output.
(A) equipment preheating
Extrude production requirement by standard tubing machine barrel and die head are carried out preheating;
(B) select suitable mouth mould and calibration sleeve, the calibration sleeve internal diameter size should be consistent with the machine head port mould internal diameter or slightly littler by about 1% than mouthful mould internal diameter; The mouth die clearance is more equal or big slightly by about 2～5% than pipe thickness; The gripper shoe cambered surface diameter of calibration sleeve is 1.05 times of calibration sleeve internal diameter, and last gripper shoe cambered surface diameter is 1.03 times of tube outer diameter, and intermediate support plate cambered surface size value changes between these two values step by step, and guarantees gripper shoe cambered surface bottom at grade;
(C) adjustment of equipment such as hauling machine, cast-cutting saw, roll-over table is identical with the preparation of standard tubing.
(D) joint is made
Open extruder and extrude material base, the aging layer with specific purpose tool removal traction tube end surfaces inserts preheating in the material base with pipe end, rule of thumb determines preheating time, and is good up to the joint welding.
(E) start
Start also improves extruded velocity gradually to optimum yield after setting the pipe substance.When material base enters calibration sleeve, open vacuum tank water pump and vavuum pump, adjust vacuum, begin to produce the heavy wall pipe.
(F) ordinary production of heavy wall pipe
Production technology during heavy wall pipe ordinary production is according to the difference of thick-walled pipe specification and different, but technological temperature is basic identical.See the following form:
| Barrel zone temperature ℃ | Die head temperature ℃ | Vacuum tank temperature ℃ | Bosh temperature ℃ |
| 150～155 | 150～155 | 20～25 | 30～55 |
In normal productive process, tubing is produced the 0.5m light-wall pipe every fixed length (deciding according to need), and (wall thickness is 20～40mm), and carries out cut mark at the thin place of wall, is beneficial to the online cutting of thick-walled pipe.
(G) shut down
Produce 3.0～4.0m thin-wall pipes during shutdown, this is the traction of tubing for convenience, simultaneously in order to guarantee that tubing cools off fully.Keeping the time of vacuum decides according to the length of vacuum tank.
Claims (2)
1, a kind of PE thick-wall tube production method is characterized in that from the following aspects equipment and technology being improved respectively on the basis of existing PE tubing extruding production line:
(1) improvement of mould: mouthful die clearance is 1-1.05 a times of pipe thickness, and the calibration sleeve internal diameter size is 0.98-1 a times of machine head port mould internal diameter, to guarantee the formation of vacuum;
(2) improvement of cutting scheme: the planet cast-cutting saw is not made any change, when producing thick-walled pipe, every production drive sleeve is interrupted produces the long light-wall pipe of one section 0.5m, and carry out cut mark at the thin place of wall, be beneficial to the online cutting of thick-walled pipe, on pipe production line, thick-walled pipe is cut into segment in advance, on horizontal saw mill, further cuts then according to the pipe fitting processing request;
(3) improvement of processing technology comprises: open extruder material extrusion base; remove the aging layer of traction tube end surfaces; pipe end is inserted preheating in the material base, determine preheating time, good up to the joint welding; start also improves extruded velocity gradually to optimum yield after setting the pipe substance; when material base enters calibration sleeve, open vacuum tank water pump and vavuum pump, adjust vacuum, begin to produce the heavy wall pipe; produce 3.0-4.0 rice thin-wall pipes during shutdown, tubing is cooled off fully.
2, PE thick-wall tube production method according to claim 1, it is 1.05 times of calibration sleeve internal diameter that the improvement that it is characterized in that mould also is included in gripper shoe cambered surface diameter near calibration sleeve, last gripper shoe cambered surface diameter is 1.03 times of tube outer diameter, intermediate support plate cambered surface size value changes between these two values step by step, and guarantees gripper shoe cambered surface bottom at grade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100448841A CN100357086C (en) | 2005-09-27 | 2005-09-27 | Production of PE piping materials with thick wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100448841A CN100357086C (en) | 2005-09-27 | 2005-09-27 | Production of PE piping materials with thick wall |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1746004A CN1746004A (en) | 2006-03-15 |
| CN100357086C true CN100357086C (en) | 2007-12-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100448841A Expired - Fee Related CN100357086C (en) | 2005-09-27 | 2005-09-27 | Production of PE piping materials with thick wall |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100357086C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0835177B1 (en) * | 1995-06-26 | 2001-12-12 | Nextrom Holding S.A. | Extrusion apparatus and method for orienting plastic material by using an extrusion apparatus |
| CN2496648Y (en) * | 2001-08-23 | 2002-06-26 | 温樱红 | Two-layer composite PE pipe |
| CN1368428A (en) * | 2001-02-06 | 2002-09-11 | 山东胜利股份有限公司 | Two-step technology for machining plastic pipe with thick-wall PE pipe |
-
2005
- 2005-09-27 CN CNB2005100448841A patent/CN100357086C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0835177B1 (en) * | 1995-06-26 | 2001-12-12 | Nextrom Holding S.A. | Extrusion apparatus and method for orienting plastic material by using an extrusion apparatus |
| CN1368428A (en) * | 2001-02-06 | 2002-09-11 | 山东胜利股份有限公司 | Two-step technology for machining plastic pipe with thick-wall PE pipe |
| CN2496648Y (en) * | 2001-08-23 | 2002-06-26 | 温樱红 | Two-layer composite PE pipe |
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| Publication number | Publication date |
|---|---|
| CN1746004A (en) | 2006-03-15 |
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