CN102806651A - Sectional variable pitch screw - Google Patents
Sectional variable pitch screw Download PDFInfo
- Publication number
- CN102806651A CN102806651A CN2011101434127A CN201110143412A CN102806651A CN 102806651 A CN102806651 A CN 102806651A CN 2011101434127 A CN2011101434127 A CN 2011101434127A CN 201110143412 A CN201110143412 A CN 201110143412A CN 102806651 A CN102806651 A CN 102806651A
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- China
- Prior art keywords
- section
- tooth
- teeth
- screw
- axial cross
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- 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.)
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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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/535—Screws with thread pitch varying along the longitudinal axis
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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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a sectional variable pitch screw, which is an outer screw thread straight rod member with a pitch of 100-140 mm and a tooth height of 14-23 mm, and is sequentially divided into a conveying section A, a feeding section B, a compression section C and an extrusion section D from the root to the end of the screw. The conveying section A is provided with 5-7 teeth, and the feeding section B is provided with 2-3 teeth, wherein an axial section area of each tooth of the feeding section B is 20-30% larger than an axial section area of each tooth of the conveying section A. The compression section C is provided with 2-3 teeth, wherein an axial section area of each tooth of the compression section C is 20-30% smaller than an axial section area of each tooth of the feeding section B. The extrusion section D is provided with 3-5 teeth, wherein parameters of various teeth are different, pitches are sequentially increased, tooth heights are sequentially decreased, axial section areas of various teeth of the extrusion section D are maintained to the same, and the section area is equal to an axial section area of each tooth of the extrusion section D. With the screw having a differentiation structure design, pasty BMC produces a kneading effect during extrusion, such that BMC homogenization is promoted, the material can not overflow in a reverse direction, and glass fibers in the pasty BMC can not be broken without reason.
Description
Technical field
The present invention relates to a kind of screw rod of screw extruder, specifically, the present invention relates to a kind of segmented varying pitch screw of screw extruder.
Background technology
Usually do the raw material melting during plastic mould pressing production of articles earlier, and then in mould, inject paste raw materials through screw extruder.BMC is that a kind of glass strengthens the unsaturated polyester (UP) BMC, and these kind plastics are contemporary model engineering plastics, compares with common plastics on physical property, to have to contain glass in the bigger difference, particularly component and help increasing article construction intensity.The glass heat resistance is at 450 ℃～500 ℃, and melting BMC is only about 230 ℃, so contained glass is not melted.When extruding BMC with commercially available screw extruder, because of screw rod is the constant pitch structure, be prone to anti-flash when extruding, anti-flash causes contained glass to be torn, and impaired glass has reduced original humidification, and follow-up pressing intensity index is descended.If in combination, reserve the increment glass, can compensate the glass that is torn, but increase production cost, so this method is used seldom.In addition, also having a big shortcoming when commercially available screw extruder is extruded BMC, is exactly that the constant pitch screw rod is the zero compression ratio when extruding, and it is not enough to constitute the BMC paste material density of extruding, and makes the quality index of follow-up pressing not reach designing requirement.
Summary of the invention
The present invention is primarily aimed at the deficiency of prior art, proposes a kind of segmented varying pitch screw, and this screw-rod structure is simple, and charging is easy, and not anti-flash when extruding is few to including the glass damage, and extrudes the density that improves paste material through supercharging.
The present invention realizes technical goal through following technical proposals.
The segmented varying pitch screw; It is that pitch is 100mm～140mm; The external screw thread straight-bar member of the high 14mm～23mm of tooth; The relevant position segmentation of the corresponding extruder inner chamber of screw rod is provided with the screw thread of different parameters, is divided into transportation section A, feed zone B, compression section C and extruding zone D successively from screw rod root to end.Its improvements are: transportation section A is provided with 5～7 teeth, and feed zone B is provided with 2～3 teeth, and the axial cross section of every tooth of feed zone B is long-pending greater than every tooth axial cross section of transportation section A long-pending 20%～30%.Said compression section C is provided with 2～3 teeth, and every tooth axial cross section is long-pending littler by 20%～30% than feed zone B.Said extruding zone D is provided with 3～5 teeth, every tooth axle parameter difference, and promptly pitch strengthens in proper order, and the high order of tooth reduces, but still keeps every tooth axial cross section long-pending equal, and every tooth axial cross section that this sectional area equals extruding zone D amasss.
In the said structure, the screw rod external screw thread is a single head dextrorotation rectangular thread.
The present invention compared with prior art has following good effect:
1, the segmented varying pitch is simple in structure, and is easy to manufacture;
2, the feed zone screw thread is darker than transportation section screw thread, makes paste material produce a certain amount of radial motion, helps charging, avoids taking place anti-flash from structure, and the glass of also avoiding including simultaneously is torn;
3, screw rod adopts pitch and the Ya Gao structure that changes, and the paste material of extruding is further integrated evenly, and obtain a certain amount of volume compression, facilitates the paste material dense structure that extrudes, and helps improving the quality of follow-up pressing.
Description of drawings
Fig. 1 is screw rod of the present invention and the local structural profile sketch map that cooperates of extruder inner chamber.
The specific embodiment
According to accompanying drawing and combine embodiment, the present invention is described further below.
Segmented varying pitch screw shown in Figure 1; It is that pitch is 100mm～140mm; The external screw thread straight-bar member of the high 14mm～23mm of tooth; The relevant position segmentation of the corresponding extruder inner chamber of screw rod is provided with the screw thread of different parameters, is divided into transportation section A, feed zone B, compression section C and extruding zone D successively from screw rod root to end.Said transportation section A is provided with 5～7 teeth, and feed zone B is provided with 2～3 teeth, and the axial cross section of every tooth of feed zone B is long-pending greater than every tooth axial cross section of transportation section A long-pending 20%～30%.Said compression section C is provided with 2～3 teeth, and every tooth axial cross section is long-pending littler by 20%～30% than feed zone B.Said extruding zone D is provided with 3～5 teeth, every tooth axle parameter difference, and promptly pitch strengthens in proper order, and the high order of tooth reduces, but still keeps every tooth axial cross section long-pending equal, and every tooth axial cross section that this sectional area equals extruding zone D amasss.
The present invention adopts the screw rod of above-mentioned segmented difference structural design, has further optimized the extrusion of BMC.Present embodiment is the MK-90BMC screw extruder, and transportation section A screw thread is provided with 6 teeth, and pitch is 100mm, and the tooth height is 20mm, and rectangular thread helps paste BMC axially-movable.Feed zone B section screw thread is totally 2 teeth, and the tooth height is 23mm, and pitch is 100mm, and the paste BMC that dark slightly screw thread facilitates transportation section A to transmit produces an inside radial motion, helps paste BMC and gets into the extruder inner chamber.Compression section C has produced the paste BMC compacting that radial motion fluffs through the axial cross section that reduces tooth is long-pending with feed zone B, and compression section C screw thread is 2 teeth only, and pitch is 100mm, the high 20mm of tooth.Extruding zone D is provided with 4 pitch threads, and every tooth increases pitch in proper order, high corresponding the reducing of tooth.Promptly the first tooth pitch adds greatly 110mm, the high 18.2mm of tooth.Second tooth pitch is enlarged to 120mm, the high 16.7mm of tooth.The 3rd tooth pitch is enlarged to 130mm, the high 15.4mm of tooth.The 4th tooth pitch is enlarged to 140mm, the high 14.3mm of tooth.Although thread parameter has difference, the axial cross section of every tooth is long-pending identical.Long-pending every the tooth axial cross section of compression section C that equals of every tooth axial cross section of extruding zone D amasss.Through the screw rod of above-mentioned differential structural design, paste BMC is extruded produce slight rubbing effect, promote the BMC homogeneous.Also having a significant positive role when the present invention uses, is exactly BMC at the reverse flash of extrusion, and the glass that includes is not pulled apart without reason, has both improved extrusion efficiency, does not destroy the physical property of the original component of paste BMC yet.
Claims (2)
1. segmented varying pitch screw; It is that pitch is 100mm～140mm; The external screw thread straight-bar member of the high 14mm～23mm of tooth; The relevant position segmentation of the corresponding extruder inner chamber of screw rod is provided with the screw thread of different parameters, is divided into transportation section A, feed zone B, compression section C and extruding zone D successively from screw rod root to end; It is characterized in that: transportation section A is provided with 5～7 teeth, and feed zone B is provided with 2～3 teeth, and the axial cross section of every tooth of feed zone B is long-pending greater than every tooth axial cross section of transportation section A long-pending 20%～30%; Said compression section C is provided with 2～3 teeth, and every tooth axial cross section is long-pending littler by 20%～30% than feed zone B; Said extruding zone D is provided with 3～5 teeth, every tooth axle parameter difference, and promptly pitch strengthens in proper order, and the high order of tooth reduces, but still keeps every tooth axial cross section long-pending equal, and every tooth axial cross section that this sectional area equals extruding zone D amasss.
2. segmented varying pitch screw according to claim 1 is characterized in that: said screw rod external screw thread is a single head dextrorotation rectangular thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101434127A CN102806651A (en) | 2011-05-31 | 2011-05-31 | Sectional variable pitch screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101434127A CN102806651A (en) | 2011-05-31 | 2011-05-31 | Sectional variable pitch screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102806651A true CN102806651A (en) | 2012-12-05 |
Family
ID=47230599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101434127A Pending CN102806651A (en) | 2011-05-31 | 2011-05-31 | Sectional variable pitch screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102806651A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114196201A (en) * | 2021-12-30 | 2022-03-18 | 宁波坚锋新材料有限公司 | Regenerated glass fiber reinforced nylon 66 composite material and preparation method thereof |
| CN114453208A (en) * | 2022-04-11 | 2022-05-10 | 江苏高凯精密流体技术股份有限公司 | Feeding device capable of preventing bubbles from being generated |
-
2011
- 2011-05-31 CN CN2011101434127A patent/CN102806651A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114196201A (en) * | 2021-12-30 | 2022-03-18 | 宁波坚锋新材料有限公司 | Regenerated glass fiber reinforced nylon 66 composite material and preparation method thereof |
| CN114196201B (en) * | 2021-12-30 | 2023-08-25 | 宁波坚锋新材料有限公司 | Regenerated glass fiber reinforced nylon 66 composite material and preparation method thereof |
| CN114453208A (en) * | 2022-04-11 | 2022-05-10 | 江苏高凯精密流体技术股份有限公司 | Feeding device capable of preventing bubbles from being generated |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20121205 |