CN2126516Y - High-efficiency injection screw without metering section - Google Patents
High-efficiency injection screw without metering section Download PDFInfo
- Publication number
- CN2126516Y CN2126516Y CN 92228487 CN92228487U CN2126516Y CN 2126516 Y CN2126516 Y CN 2126516Y CN 92228487 CN92228487 CN 92228487 CN 92228487 U CN92228487 U CN 92228487U CN 2126516 Y CN2126516 Y CN 2126516Y
- Authority
- CN
- China
- Prior art keywords
- screw
- section
- metering section
- screw rod
- plasticizing
- 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.)
- Expired - Fee Related
Links
- 238000002347 injection Methods 0.000 title claims abstract description 14
- 239000007924 injection Substances 0.000 title claims abstract description 14
- 230000006835 compression Effects 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 28
- 238000005979 thermal decomposition reaction Methods 0.000 abstract description 6
- 230000008018 melting Effects 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract description 2
- 229920011532 unplasticized polyvinyl chloride Polymers 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000004927 fusion Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 206010003497 Asphyxia Diseases 0.000 description 1
- 241001661918 Bartonia Species 0.000 description 1
- 210000001015 abdomen Anatomy 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Images
Landscapes
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
无计量段高效注射螺杆，在只有两段组成的螺杆 主体部分的前端联接有带有止逆环的螺纹螺杆头，螺 杆主体段L分为具有较深螺槽的输送段L2和变深 螺槽的塑化段L2，L＝(18-20)D，L1＝(9-10)D， L2＝(9-10)D，深螺槽槽深h1＝(0.14-0.16)D，压缩 比ε＝h1/h2＝2.1-2.3，由于以上结构及设计参数的 改变，相对增加了第一、二段的有效塑化长度，增加了 物料的热历程，使物料可在充分熔融的基础上向前推 进，浅螺槽的计量段的取消，有效地降低了剪切热，防 止了某些物料的热分解。
High-efficiency injection screw without metering section. The front end of the main part of the screw composed of only two sections is connected with a threaded screw head with a non-return ring. The plasticizing section of the groove L 2 , L=(18-20)D, L 1 =(9-10)D, L 2 =(9-10)D, deep groove depth h 1 =(0.14-0.16) D. Compression ratio ε=h 1 /h 2 =2.1-2.3. Due to the changes in the above structure and design parameters, the effective plasticizing length of the first and second stages is relatively increased, and the thermal history of the material is increased, so that the material can be used in On the basis of full melting, it advances forward, and the cancellation of the metering section of the shallow screw groove effectively reduces the shear heat and prevents the thermal decomposition of certain materials.
Description
The utility model relates to a kind of plastic processing machinery, particularly a kind of efficient injection screw of no metering section that is applied on the plastic-injection moulding machine.
Injection screw is the critical component of injection (mo(u)lding) machine, and the correctness that its structural design and optimization of geometric parameters are selected directly has influence on the quality quality of injection molded article and the height of output, and is related to the accommodation of injector to different material.The basic structure of present conventional injection screw as shown in Figure 1, this screw rod is made of screw rod main part 1 and screw head 2, the main part of screw rod 1 is divided into feeding section L again
1, compression section L
2With metering section L
3, three sections sums are generally 18D, and wherein D is the screw rod external diameter, and three sections sums are called L.It each section segment length distributes is: L
1=8D, L
2=6D, L
3=4D, the pitch t=D of screw rod, bosom screw channel groove depth is h
1=0.12D, compression ratio h
1/ h
3=2.5.h
3Be the most shallow place of screw rod screw channel groove depth.The conveying of the conventional screw of this old syllogic and plasticizing mechanism mainly are to be undertaken by friction and internal shear effect between material and screw rod, machine barrel, the spiro rod plasticizing process will be occupied an leading position gradually from the energy of shear heat, and external heat will account for secondary status, and shear heat depends primarily on factors such as the physical property of the shape of screw channel and each section physical dimension and material and rheological property.When solid material is brought L into from expecting mouthful adding and the screw rod that is rotated
1Realize Solid Conveying and Melting in the dark screw channel of section, enter into the L that screw channel shoals gradually then
2Be compressed plasticizing in the section, enter the L of dark screw channels such as having again
3Section is subjected to the further strong homogenization of shearing, and flows into screw front end at last, waits for next time being injected into mold cavity in the injection process.
The problem that this conventional three-stage screw exists have following some:
First: because the L of this screw rod
3Section is longer, makes L
2And L
1Segment length shortens relatively, and the thermal history of material in screw channel is restricted, and makes to enter into L
2The material of section is difficult to complete fusion, promptly can't normally enter into the more shallow L of screw channel
3In the section, so just produce material by the asphyxia by external pressure on the chest and abdomen phenomenon, cause the rising of screw axial pressure and moment of torsion, the screw rod overload maybe can't be rotated, therefore, have to take the slow-speed of revolution to remedy the pile-up phenomenon of material, make screw rod under high rotating speed, not work, have a strong impact on the raising of production capacity with the way of time of staying of prolonging material.
Second: because L
3The existence of section shallow screw channel section, when material at L
2And L
1After the effect that is rubbed continuously and shear, again at L
3Section is subjected to more violent shear action, has caused the bulk deposition of energy, and temperature of charge is risen, for the materials such as hard vinyl chloride of thermostability difference, be easy to therefore produce thermal decomposition, cause the carbonization of material, and produce poison gas, injection can't be carried out.
Three, present, people attempt to adopt the way of the structure that reduces rotating speed and cancellation band check ring screw head to reduce thermal decomposition and the pile-up material problem that shear heat causes, but when the hard vinyl chloride the part with complicated structure of processing, owing to runner and the complicated increase that causes the die cavity resistance of die cavity, and then the very big back-pressure of generation refluxes, can't guarantee high filled film pressure, so can't mold qualified UPVC goods, this also can't use the reason place of UPVC moulding the part with complicated structure just up to now.
The purpose of this utility model just is to overcome the above-mentioned shortcoming and defect of existing in prior technology, and provides a kind of by two-part screw rod main body with have the threaded screw head of check ring and the high productive capacity that constitutes, do not produce thermal decomposition, be applicable to the efficient injection screw of no metering section of moulding UPVC the part with complicated structure.
The purpose of this utility model is to realize by following technical scheme, is connected with the threaded screw head that has check ring at the front end of the screw rod main part of having only two sections compositions, and screw rod main paragraph L is divided into the transportation section L with dark screw channel
2With the fluxing zone L that deepens screw channel
2, L=(18-20) D, L
1=(9-10) D, L
2=(9-10) D, dark screw channel groove depth h
1=(0.14-0.16) D, compression ratio ε=h
1/ h
2=2.1-2.3, because the change of above structure and design parameter, increased effective plasticizing length of first and second section relatively, increased the thermal history of material, material can be pushed ahead on the basis of fully fusion, the cancellation of the metering section of shallow screw channel has reduced shear heat effectively, has prevented the thermal decomposition of some material.
Therefore: remarkable result of the present utility model is:
1, material is difficult for blocking, and rotating speed is improved, so the production capacity height.
2, not only can process common material, and be suitable for the processing of the materials such as UPVC of poor heat stability, enlarge the scope of application.
3, because screw rod shearing heat reduces, can realize low-temperature plasticizing, make material reach the high de-agglomeration degree, so can be provided with the screw head of check ring, prevented the backflow of material effectively, improved cavity pressure, so UPVC goods that can the forming shape complexity.
4, the two-part screw rod is convenient to processing, can reduce manufacturing cost.
Concrete structure of the present utility model is realized by the following examples and accompanying drawing thereof.
Fig. 1 is existing conventional screw structure chart.
Fig. 2 is a structure chart of the present utility model.
Be described in detail below in conjunction with 2 pairs of concrete structures of the present utility model of accompanying drawing:
The utility model is made of with the screw head 2 that is connected with screw rod main paragraph 1 front end screw rod main paragraph 1, and it is characterized in that: screw rod main paragraph 1 is by transportation section L
1With fluxing zone L
2Constitute, screw head 2 is provided with screw thread 2A, is movably installed with check ring 3 on the optical axis section 2B of screw head 2.Referring to Fig. 2
Architectural feature of the present utility model also is:
Transportation section L
1Length be 10-20D, fluxing zone L
2Length be 9-10D, screw rod main paragraph total length L is 18-20D, h
1Be 0.14-0.16D, screw compression is than ε=h
1/ h
2=2.1-2.3.Referring to Fig. 2.
Working mechanism of the present utility model is:
Owing to cancelled metering section L
3Even under the constant situation of screw rod length overall, also equal to have increased by second section L
2With first section L
1Length, increased the thermal history of material at this section, fusion is unlikely at L fully to make material
2Section is stifled squeezes, and its rotating speed can be enhanced about more than once when the identical material of processing.Production capacity is greatly improved.
Owing to cancelled the metering section L of shallow screw channel
3, the ratio from shear energy of storing up, make that has greatly reduced the material energy is controlled, and has increased the ratio of external heat source control, prevents thermal decomposition with the way of accurately controlling temperature of charge, to adapt to the processing of goods such as UPVC.
Because screw rod shearing heat reduces, so can realize low temperatureization, make material reach high decomposition temperature, therefore, can add the threaded screw head 2 of being with check ring 3, the setting of screw thread 2A on the screw head, prevented that not only melt from decomposing in the viscous flow of its head, and the melt owing to anti-stream has been subjected to the sealing of check ring 3 when injection, so can set up higher model pressure, therefore, can mold complex-shaped UPVC goods.
In some cases, very short L also can be set
3Metering section, this moment L
3Length be (0-1) D.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92228487 CN2126516Y (en) | 1992-07-25 | 1992-07-25 | High-efficiency injection screw without metering section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92228487 CN2126516Y (en) | 1992-07-25 | 1992-07-25 | High-efficiency injection screw without metering section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2126516Y true CN2126516Y (en) | 1993-01-06 |
Family
ID=33772128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92228487 Expired - Fee Related CN2126516Y (en) | 1992-07-25 | 1992-07-25 | High-efficiency injection screw without metering section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2126516Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850603A (en) * | 2010-04-30 | 2010-10-06 | 三斯达(福建)塑胶有限公司 | Main-machine screw rod of EVA (Ethylene Vinyl Acetate) leftover material plasticizing and granulating device |
| CN106671389A (en) * | 2016-12-02 | 2017-05-17 | 余国庆 | Plasticizing machine threaded rod for recycling of multiple kinds of rubber |
| CN110587949A (en) * | 2019-10-10 | 2019-12-20 | 安徽皖维皕盛新材料有限责任公司 | Method for improving output of PVB film extruder |
-
1992
- 1992-07-25 CN CN 92228487 patent/CN2126516Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101850603A (en) * | 2010-04-30 | 2010-10-06 | 三斯达(福建)塑胶有限公司 | Main-machine screw rod of EVA (Ethylene Vinyl Acetate) leftover material plasticizing and granulating device |
| CN106671389A (en) * | 2016-12-02 | 2017-05-17 | 余国庆 | Plasticizing machine threaded rod for recycling of multiple kinds of rubber |
| CN110587949A (en) * | 2019-10-10 | 2019-12-20 | 安徽皖维皕盛新材料有限责任公司 | Method for improving output of PVB film extruder |
| CN110587949B (en) * | 2019-10-10 | 2022-03-08 | 安徽皖维皕盛新材料有限责任公司 | Method for improving output of PVB film extruder |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |