CN114750391A - PVC pipe extrusion die capable of eliminating melt stress - Google Patents
PVC pipe extrusion die capable of eliminating melt stress Download PDFInfo
- Publication number
- CN114750391A CN114750391A CN202210476646.1A CN202210476646A CN114750391A CN 114750391 A CN114750391 A CN 114750391A CN 202210476646 A CN202210476646 A CN 202210476646A CN 114750391 A CN114750391 A CN 114750391A
- Authority
- CN
- China
- Prior art keywords
- die
- lead screw
- transmission gear
- fixing bearing
- screw rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001125 extrusion Methods 0.000 title claims abstract description 23
- 239000000155 melt Substances 0.000 claims abstract description 22
- 230000007246 mechanism Effects 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 44
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 229920000915 polyvinyl chloride Polymers 0.000 abstract description 27
- 239000004800 polyvinyl chloride Substances 0.000 abstract description 27
- 239000000463 material Substances 0.000 abstract description 2
- 229920003023 plastic Polymers 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/76—Cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a PVC (polyvinyl chloride) pipe extrusion die for eliminating melt stress, which comprises a die supporting frame, a die body, a rotation driving mechanism, a first screw rod fixing bearing, a second screw rod fixing bearing, a first core rod fixing screw rod and a rotary core rod, wherein the die body is fixedly arranged on the die supporting frame, the rotation driving mechanism is arranged in the die body, the first screw rod fixing bearing and the second screw rod fixing bearing are both fixedly arranged in the die body, the first core rod fixing screw rod is rotatably arranged on the second screw rod fixing bearing, the rotary core rod is rotatably arranged on the first screw rod fixing bearing, the first core rod fixing screw rod is connected with the rotary core rod, and the first core rod fixing screw rod is connected with the rotation driving mechanism. The invention relates to the technical field of plastic pipe extrusion dies, and particularly provides a PVC pipe extrusion die capable of eliminating melt stress, which adopts a special die structure, rearranges PVC material molecular chains in the die, thoroughly eliminates the internal stress of a melt, and solves the problem of 'screw line' phenomenon of PVC pipes.
Description
Technical Field
The invention relates to the technical field of plastic pipe extrusion dies, in particular to a PVC pipe extrusion die for eliminating melt stress.
Background
The PVC molecular structure contains chlorine element, the PVC molecular structure is polar, the flowability is poor, the PVC molecular structure is difficult to process, the production is generally carried out by adopting a counter-conical double-screw extrusion molding method, a screw groove of the counter-conical double-screw is from deep to shallow, the diameter of the screw is from large to small, the formed compression ratio is quite large, PVC can be fully and uniformly plasticized, the quality of a product is ensured, but the internal stress concentration of a PVC melt is easily caused by the ultrahigh compression ratio, continuous annular and uneven 'screw lines' are easily formed on the inner wall of the produced PVC pipe, the appearance of the product is not only ugly seen, but also the water flow resistance is increased, the PVC pipe is not beneficial to practical use, the phenomenon that the pressure of a mold is increased or the rotating speed of the screw is reduced to slow down 'the screw lines' is usually used in the production process, the mold cost is increased, and the productivity is also reduced.
Disclosure of Invention
In order to overcome the defects, the invention provides the PVC pipe extrusion die capable of eliminating the melt stress, which adopts a special die structure, rearranges the molecular chains of the PVC material in the die, thoroughly eliminates the internal stress of the melt and solves the problem of 'screw line' of the PVC pipe.
The invention provides the following technical scheme: the invention provides a PVC (polyvinyl chloride) pipe extrusion die for eliminating melt stress, which comprises a die support frame, a die body, a rotation driving mechanism, a first screw rod fixing bearing, a second core rod fixing screw rod and a rotary core rod, wherein the die body is fixedly arranged on the die support frame, the rotation driving mechanism is arranged in the die body, the first screw rod fixing bearing and the second screw rod fixing bearing are both fixedly arranged in the die body, the second core rod fixing screw rod is rotatably arranged on the second screw rod fixing bearing, the rotary core rod is rotatably arranged on the first screw rod fixing bearing, the first core rod fixing screw rod is connected with the rotary core rod, and the first core rod fixing screw rod is connected with the rotation driving mechanism.
In order to realize the extrusion of PVC by the rotation driving of the rotating mandrel, the rotation driving mechanism comprises a rotating motor, a first transmission gear, a second transmission gear and a transmission chain, the rotating motor is fixedly arranged on the mold supporting frame, the first transmission gear is fixedly arranged on an output shaft of the rotating motor, the second transmission gear is connected with the mandrel fixing screw through a key groove, the first transmission gear and the second transmission gear are sleeved with the transmission chain, and the transmission chain is meshed with the first transmission gear and the second transmission gear.
Preferably, the die supporting frame is rotatably arranged on a chain tensioning wheel, and the transmission chain is sleeved on the chain tensioning wheel and meshed with the chain tensioning wheel.
Furthermore, a plurality of groups of melt diversion trenches are arranged at the compression angle part of the rotary core rod.
Preferably, the connecting end face of the rotating core rod and the die body is provided with a wear-resistant and high-temperature-resistant carbon modified polytetrafluoroethylene sheet.
Further, the rotating electric machine is controlled by frequency conversion.
The invention adopting the structure has the following beneficial effects: according to the PVC pipe extrusion die for eliminating the melt stress, the rotating core rod of the extrusion die is changed into a chain transmission type rotating structure, the melt guide groove is additionally arranged at the compression angle part of the rotating core rod of the die, the rotating core rod rotates to drive the melt guide groove to stir the melt, the internal pressure distribution state of the melt is scattered, the molecular chain of the melt is rearranged at the straight section of the die body opening die, the internal stress of the melt is thoroughly eliminated, and the problem of screw threads on the inner wall of a PVC pipe is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of a PVC pipe extrusion mold for eliminating melt stress according to the present invention;
FIG. 2 is a schematic cross-sectional view of a PVC pipe extrusion mold for eliminating melt stress according to the present invention;
FIG. 3 is a schematic structural diagram of a rotating core rod of a PVC pipe extrusion die for eliminating melt stress according to the present invention.
The device comprises a die supporting frame 1, a die body 2, a die body 3, a first screw rod fixing bearing, a second screw rod fixing bearing, a 5, a mandrel fixing screw rod 6, a rotary mandrel 7, a rotary motor 8, a first transmission gear 9, a second transmission gear 10, a transmission chain 11, a chain tensioning wheel 12, a melt diversion trench 13 and a polytetrafluoroethylene sheet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that as used in the following description, the terms "front," "back," "left," "right," "upper" and "lower" refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1 to 3, the technical solution adopted by the present invention is as follows: the utility model provides an eliminate PVC tubular product extrusion tooling of fuse-element stress, includes mould support frame 1, the mould body 2, rotates actuating mechanism, lead screw fixing bearing 3, lead screw fixing bearing two 4, plug fixing screw 5 and rotatory plug 6, the mould body 2 is fixed to be located on the mould support frame 1, rotate actuating mechanism and locate in the mould body 2, lead screw fixing bearing 3 and lead screw fixing bearing two 4 are all fixed to be located in the mould body 2, plug fixing screw 5 rotates and locates on lead screw fixing bearing two 4, rotatory plug 6 rotates and locates on the lead screw fixing bearing 3, plug fixing screw 5 and rotatory plug 6 link to each other, plug fixing screw 5 links to each other with rotation actuating mechanism.
The rotary driving mechanism comprises a rotary motor 7, a first transmission gear 8, a second transmission gear 9 and a transmission chain 10, the rotary motor 7 is fixedly arranged on the mold supporting frame 1, the first transmission gear 8 is fixedly arranged on an output shaft of the rotary motor 7, the second transmission gear 9 is connected with the mandrel fixing screw rod 5 through a key groove, the transmission chain 10 is sleeved on the first transmission gear 8 and the second transmission gear 9, and the transmission chain 10 is meshed with the first transmission gear 8 and the second transmission gear 9. Rotate on the mould support frame 1 and locate chain take-up pulley 11, drive chain 10 covers and locates on chain take-up pulley 11 and mesh with chain take-up pulley 11. A plurality of groups of melt diversion trenches 12 are arranged at the compression angle part of the rotary core rod 6. The connecting end surface of the rotary core rod 6 and the die body 2 is provided with a wear-resistant and high-temperature-resistant carbon modified polytetrafluoroethylene sheet 13. The rotating motor 7 is controlled by frequency conversion.
When the device is used specifically, the rotating motor 7 is controlled by frequency conversion, the rotating speed can be adjusted according to actual conditions, the rotating motor 7 is started to rotate, the first transmission gear 8 drives the second transmission gear 9 to rotate through the transmission chain 10, the second transmission gear 9 is connected with the mandrel fixing screw 5 by a key groove, the second transmission gear 9 rotates to drive the mandrel fixing screw 5 to rotate, and further drives the rotating mandrel 6 to rotate, in order to prevent the mandrel 6 from deforming or even being stuck and fixed due to high temperature generated by rotation, the end surface of the rotating mandrel 6 is provided with the wear-resistant and high-temperature-resistant carbon modified polytetrafluoroethylene sheet 13, when a melt passes through the rotating mandrel 6, the rotating mandrel 6 is provided with the melt guiding groove 12 with a certain depth, the melt guiding groove 12 mixes the melt when the rotating mandrel 6 rotates, molecule arrangement in the melt is scattered, internal stress of the melt is eliminated, and molecular chain rearrangement is performed on the straight section of the die body 2, thoroughly eliminate the phenomenon of 'screw line' of the PVC pipe.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a eliminate PVC tubular product extrusion tooling of fuse-element stress which characterized in that: including mould support frame, the mould body, rotation actuating mechanism, lead screw fixing bearing I, lead screw fixing bearing II, plug fixation lead screw and rotatory plug, the mould body is fixed to be located on the mould support frame, it is internal that rotation actuating mechanism locates the mould, lead screw fixing bearing I and lead screw fixing bearing II are all fixed to be located in the mould body, plug fixation lead screw rotates to be located on lead screw fixing bearing II, rotatory plug rotates to be located on lead screw fixing bearing I, plug fixation lead screw and rotatory plug link to each other, plug fixation lead screw links to each other with rotation actuating mechanism.
2. The PVC pipe extrusion die for eliminating the melt stress as recited in claim 1, wherein: the rotary driving mechanism comprises a rotary motor, a first transmission gear, a second transmission gear and a transmission chain, the rotary motor is fixedly arranged on the die supporting frame, the first transmission gear is fixedly arranged on an output shaft of the rotary motor, the second transmission gear is connected with the mandrel fixing screw rod through a key groove, the transmission chain is sleeved on the first transmission gear and the second transmission gear, and the transmission chain is meshed with the first transmission gear and the second transmission gear.
3. The PVC pipe extrusion die for eliminating the melt stress as recited in claim 2, wherein: the mould support frame is rotated and arranged on the chain tensioning wheel, and the transmission chain is sleeved on the chain tensioning wheel and meshed with the chain tensioning wheel.
4. The PVC pipe extrusion die for eliminating the melt stress as recited in claim 1, wherein: and a plurality of groups of melt diversion trenches are arranged at the compression angle part of the rotary core rod.
5. The PVC pipe extrusion die for eliminating the melt stress as recited in claim 1, wherein: and the connecting end surface of the rotary core rod and the die body is provided with a wear-resistant and high-temperature-resistant carbon modified polytetrafluoroethylene sheet.
6. The PVC pipe extrusion die for eliminating the melt stress as recited in claim 1, wherein: the rotating motor is controlled by adopting frequency conversion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210476646.1A CN114750391A (en) | 2022-04-30 | 2022-04-30 | PVC pipe extrusion die capable of eliminating melt stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210476646.1A CN114750391A (en) | 2022-04-30 | 2022-04-30 | PVC pipe extrusion die capable of eliminating melt stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114750391A true CN114750391A (en) | 2022-07-15 |
Family
ID=82332828
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210476646.1A Pending CN114750391A (en) | 2022-04-30 | 2022-04-30 | PVC pipe extrusion die capable of eliminating melt stress |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114750391A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2426408Y (en) * | 2000-06-30 | 2001-04-11 | 中国科学院化学研究所 | Rotary extrusion handpiece for plastics tubing |
| CN2642496Y (en) * | 2003-07-31 | 2004-09-22 | 孙明礼 | Pipe die with a rotatable core |
| CN200984809Y (en) * | 2006-12-13 | 2007-12-05 | 华南理工大学 | Internal-spiral silencing water-draining pipe extruding and forming device |
| CN202753385U (en) * | 2012-01-14 | 2013-02-27 | 新疆天业（集团）有限公司 | Pipe machine nose with choke device |
| CN209409247U (en) * | 2018-11-14 | 2019-09-20 | 联塑科技发展(贵阳)有限公司 | A kind of high helicity rotation pipe mold |
| CN211492764U (en) * | 2019-11-07 | 2020-09-15 | 重庆永高塑业发展有限公司 | Structural wall pipe combined mould with reinforcing ribs |
| CN111745934A (en) * | 2020-06-28 | 2020-10-09 | 广东联塑科技实业有限公司 | Mould for producing thick-wall pipe with uniform wall thickness |
| CN212331763U (en) * | 2020-04-28 | 2021-01-12 | 天津华旭盛达机械制造有限公司 | Composite machine head for producing thin-wall pipe |
-
2022
- 2022-04-30 CN CN202210476646.1A patent/CN114750391A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2426408Y (en) * | 2000-06-30 | 2001-04-11 | 中国科学院化学研究所 | Rotary extrusion handpiece for plastics tubing |
| CN2642496Y (en) * | 2003-07-31 | 2004-09-22 | 孙明礼 | Pipe die with a rotatable core |
| CN200984809Y (en) * | 2006-12-13 | 2007-12-05 | 华南理工大学 | Internal-spiral silencing water-draining pipe extruding and forming device |
| CN202753385U (en) * | 2012-01-14 | 2013-02-27 | 新疆天业（集团）有限公司 | Pipe machine nose with choke device |
| CN209409247U (en) * | 2018-11-14 | 2019-09-20 | 联塑科技发展(贵阳)有限公司 | A kind of high helicity rotation pipe mold |
| CN211492764U (en) * | 2019-11-07 | 2020-09-15 | 重庆永高塑业发展有限公司 | Structural wall pipe combined mould with reinforcing ribs |
| CN212331763U (en) * | 2020-04-28 | 2021-01-12 | 天津华旭盛达机械制造有限公司 | Composite machine head for producing thin-wall pipe |
| CN111745934A (en) * | 2020-06-28 | 2020-10-09 | 广东联塑科技实业有限公司 | Mould for producing thick-wall pipe with uniform wall thickness |
Non-Patent Citations (1)
| Title |
|---|
| 封朴: "聚合物合金", 31 January 1997, 同济大学出版社, pages: 202 - 203 * |
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