CN202293291U - Vacuum system of dual-screw extruder - Google Patents
Vacuum system of dual-screw extruder Download PDFInfo
- Publication number
- CN202293291U CN202293291U CN2011204441147U CN201120444114U CN202293291U CN 202293291 U CN202293291 U CN 202293291U CN 2011204441147 U CN2011204441147 U CN 2011204441147U CN 201120444114 U CN201120444114 U CN 201120444114U CN 202293291 U CN202293291 U CN 202293291U
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- CN
- China
- Prior art keywords
- screw extruder
- reverse
- vacuum system
- vacuum port
- vacuum
- 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 - Lifetime
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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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/76—Venting, drying means; Degassing means
- B29C48/763—Vent constructions, e.g. venting means avoiding melt escape
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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
- B29C48/40—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 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The utility model relates to a vacuum system of a dual-screw extruder, which comprises a vacuum port, wherein at least one of the following four structures is arranged for the vacuum port: the end surface of the vacuum port is an incline end surface, or a reverse shearing component, a reverse transmission component or a baffle plate is arranged in front of the vacuum port. Preferably, the reverse shearing component is a shearing component with the transmission direction opposite to the extrusion direction, and is formed by arranging meshing discs in a certain staggering angle, a spiral angle formed by the meshing discs is in consistent with the spiral direction of the reverse transmission component; and the reverse transmission component is a transmission component with the transmission direction opposite to the extrusion direction. The baffle plate is provided with a plurality of venting holes, for example, the quantity of the venting holes is 5 or 6, and the inclination angle of the incline end face is 15 DEG. According to the vacuum system of the dual-screw extruder, provided by the utility model, has the advantages of skilled design, simple structure, and capability of preventing overflow in a vacuumizing process, and is suitable for massive popularization and application.
Description
Technical field
The utility model relates to the vacuum system technical field, and particularly the extruder vacuum system technical field specifically is meant a kind of double screw extruder vacuum system.
Background technology
The production equipment that is used for modifying plastics at present often is engagement type double screw extruder in the same way.Because resin raw material that modifying plastics is used and processing aid itself have moisture and in reinforced process, more or less can bring some air into; This can cause the degraded and the yellow of resin strand in the high-temperature mixing process; The tie rod air entrainment causes disconnected bar easily in the drafting process; This has not only influenced the quality of product, has also caused the discontinuous of production.Therefore be necessary to adopt the vacuum drawn system, to remove moisture and air wherein strongly at the exhaust outlet of double screw extruder equipment.
With natural exhaust phase ratio, under identical process conditions, vacuumize under the situation of strong exhaust dehydration, molten plastic overflows from exhaust outlet easily, causes unstable product quality, even stops.Therefore be necessary to take suitable measure to prevent the not even vacuum flash of the degassing.
Be used at present prevent that the measure of vacuum flash from having following:
(1) geometric parameter of change screw rod: reduce the spacing of screw rod and machine barrel etc.;
(2) characteristic of change head: the order number of adjustment head screen pack, maintenance filter screen cleaning;
(3) adjusting process parameter: improve head temperature, improve the screw rod revolution, reduce modified plastics output.
But height fill or the process of high modifying plastics granulation of melting finger in, implement above measure and also the situation of vacuum flash possibly occur, and the most effectively extruder vacuum system is transformed.
In sum, be necessary the vacuum system of transformation and optimization double screw extruder, prevent the flash in the vacuum.
The utility model content
The purpose of the utility model is to have overcome above-mentioned shortcoming of the prior art; A kind of double screw extruder vacuum system is provided, and this double screw extruder Vacuum System Design is ingenious, simple for structure; Can prevent the flash in the vacuum, be suitable for large-scale promotion application.
To achieve these goals; The double screw extruder vacuum system of the utility model; Comprise vacuum port; Be characterized in that said vacuum port is provided with one of following four kinds of structures at least: the end face of said vacuum port is an inclined end face, or be provided with reverse shearing elements, reverse delivery element or striker plate before the said vacuum port.
Said reverse shearing elements is throughput direction and extrudes shearing elements in the opposite direction.Preferable, reverse shearing elements is rearranged with certain stagger angle by several mesh plates, and mesh plate generally has four, five, seven; The mesh plate stagger angle has 30 °, 45 °, 60 °; The helical angle that mesh plate forms is consistent with the hand of spiral of reverse delivery element, and shearing elements length has 64,48; 32 etc., regular size has K30 °/7/96L, K45 °/5/48L, K60 °/4/32L etc.
Said reverse delivery element is throughput direction and extrudes delivery element in the opposite direction.Preferable, it is 30 ° that feed angle is selected for use, by the helical pitch specification 32/16L, 48/24L, 64/32L etc. is arranged.
Preferably, said striker plate is provided with some passages.
More preferably, the number of said passage is 5 or 6.
Preferably, the angle of inclination of said inclined end face is 15 °.
The beneficial effect of the utility model specifically is: the double screw extruder vacuum system of the utility model, comprise vacuum port, and be characterized in; Said vacuum port is provided with one of following four kinds of structures at least: the end face of said vacuum port is an inclined end face; Or be provided with reverse shearing elements, reverse delivery element or striker plate before the said vacuum port, thus can prevent the flash in the vacuum, design ingenious; Simple for structure, be suitable for large-scale promotion application.
Description of drawings
Fig. 1 is the partial structurtes sketch map of a specific embodiment of the double screw extruder vacuum system of the utility model.
Fig. 2 is the partial structurtes sketch map of another specific embodiment of the double-screw extruding pelletizing system of the utility model.
The specific embodiment
In order more to be expressly understood the technology contents of the utility model, the special following examples of lifting specify.Should be understood that embodiment is used to explain the utility model, rather than to the restriction of the utility model.Wherein identical parts adopt identical Reference numeral.
The double screw extruder vacuum system of the utility model; Comprise vacuum port 1; Be characterized in; Said vacuum port 1 is provided with one of following four kinds of structures at least: the end face 2 of said vacuum port 1 is inclined end face, or is provided with reverse shearing elements, reverse delivery element or striker plate 3 before the said vacuum port 1.
Said reverse shearing elements is throughput direction and extrudes shearing elements in the opposite direction.Preferable, reverse shearing elements is rearranged with certain stagger angle by several mesh plates, and mesh plate generally has four, five, seven; The mesh plate stagger angle has 30 °, 45 °, 60 °; The helical angle that mesh plate forms is consistent with the hand of spiral of reverse delivery element, and shearing elements length has 64,48; 32 etc., regular size has K30 °/7/96L, K45 °/5/48L, K60 °/4/32L etc.Through reverse shearing elements is set, the conveying of material there is inhibition, prolonged the time of staying of material before vacuum port 1, improved to fill and increased pressure, make material better outgas.
Said reverse delivery element is throughput direction and extrudes delivery element in the opposite direction.Preferable, it is 30 ° that feed angle is selected for use, the reverse delivery element of half helical pitch commonly used has 32/16L, 48/24L, 64/32L etc. by the helical pitch specification.Through reverse delivery element is set, the conveying of material there is inhibition, prolonged the time of staying of material before vacuum port 1, improved to fill and increased pressure, make material outgas better.
See also shown in Figure 1ly, in a specific embodiment of the utility model, be provided with striker plate 3 before the said vacuum port 1.
Said striker plate 3 is provided with easily and hinders the structure that material passes through through air-flow, sees also shown in Figure 1ly, and in a specific embodiment of the utility model, said striker plate 3 is provided with some passages.Striker plate 3 can be fixed on the parts through suitable method, for example is welded on the barrel 4 before the vacuum port 1.Have the setting of the striker plate 3 of passage, neither influence the extraction of vacuum, blocked material again effectively and under the vacuum drawn condition, taken out of, prevented flash by air-flow.
The number of said passage can be any, and in a specific embodiment of the utility model, the number of said passage is 5 or 6.
See also shown in Figure 2ly, in another specific embodiment of the utility model, the end face 2 of said vacuum port 1 is an inclined end face.Make high-temperature molten material obtain buffering, can make synthetic resin and various additive sneak out that gas fully removes in the journey melting, can prevent that again fused materials from overflowing from vacuum port at pumping process.
The angle of inclination of said inclined end face promptly can be confirmed with the angle of horizontal plane as required, sees also shown in Figure 2ly, and in another specific embodiment of the utility model, the angle of inclination of said inclined end face is 15 °.Gradient makes high-temperature molten material that certain buffering arranged under condition of high vacuum degree definitely, is not easy to overflow; Less gradient does not influence the degassing and the dehydration of material yet.
After carrying out above modification measures, the operation in a few years of double screw extruder warp, stable, particular content is following:
1) in the high-temperature mixing process, synthetic resin is not prone to and decomposes and yellow, has effectively extracted air and moisture;
2) in the high filling-modified particle process, the flash phenomenon does not appear;
3) whole production line is stable;
4) modified particle each item Performance Detection is good.
Height melted anti-flash in finger, the high filling-modified plastics vacuum when the utility model was specially adapted to use in the same way the engagement type double screw extruder.
To sum up, the double screw extruder Vacuum System Design of the utility model is ingenious, simple for structure, can prevent the flash in the vacuum, is suitable for large-scale promotion application.
In this specification, the utility model is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and not deviate from the spirit and the scope of the utility model.Therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (6)
1. double screw extruder vacuum system; Comprise vacuum port; It is characterized in that said vacuum port is provided with one of following four kinds of structures at least: the end face of said vacuum port is an inclined end face, or be provided with reverse shearing elements, reverse delivery element or striker plate before the said vacuum port.
2. double screw extruder vacuum system according to claim 1; It is characterized in that; Said reverse shearing elements is throughput direction and extrudes shearing elements in the opposite direction; Rearranged with certain stagger angle by several mesh plates, the helical angle that mesh plate forms is consistent with the hand of spiral of reverse delivery element.
3. double screw extruder vacuum system according to claim 1 is characterized in that, said reverse delivery element is throughput direction and extrudes delivery element in the opposite direction.
4. double screw extruder vacuum system according to claim 1 is characterized in that said striker plate is provided with some passages.
5. double screw extruder vacuum system according to claim 4 is characterized in that, the number of said passage is 5 or 6.
6. double screw extruder vacuum system according to claim 1 is characterized in that, the angle of inclination of said inclined end face is 15 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204441147U CN202293291U (en) | 2011-11-10 | 2011-11-10 | Vacuum system of dual-screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204441147U CN202293291U (en) | 2011-11-10 | 2011-11-10 | Vacuum system of dual-screw extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202293291U true CN202293291U (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204441147U Expired - Lifetime CN202293291U (en) | 2011-11-10 | 2011-11-10 | Vacuum system of dual-screw extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202293291U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110901011A (en) * | 2019-12-10 | 2020-03-24 | 湖南工业大学 | Mixing extrusion natural exhaust flash compression device |
-
2011
- 2011-11-10 CN CN2011204441147U patent/CN202293291U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110901011A (en) * | 2019-12-10 | 2020-03-24 | 湖南工业大学 | Mixing extrusion natural exhaust flash compression device |
| CN110901011B (en) * | 2019-12-10 | 2021-09-10 | 湖南工业大学 | Mixing extrusion natural exhaust flash compression device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |