CN102794901A - Different-diameter extrusion screw of cold feed vented extruder - Google Patents
Different-diameter extrusion screw of cold feed vented extruder Download PDFInfo
- Publication number
- CN102794901A CN102794901A CN2012102816710A CN201210281671A CN102794901A CN 102794901 A CN102794901 A CN 102794901A CN 2012102816710 A CN2012102816710 A CN 2012102816710A CN 201210281671 A CN201210281671 A CN 201210281671A CN 102794901 A CN102794901 A CN 102794901A
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- Prior art keywords
- screw rod
- screw
- section
- cold
- thread
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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
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
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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
- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
-
- 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
- B29C48/252—Drive or actuation means; Transmission means; Screw supporting means
- B29C48/2522—Shaft or screw supports, e.g. bearings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a different-diameter extrusion screw of a cold feed vented extruder, comprising a double-step screw or a multi-step screw, wherein the screw thread external diameter of a working segment comprising the double-step screw or the multi-step screw is different in steps, thus the balance of production capacity is realized; the screw can be an integral structure or a separate structure, the steps are threadedly connected with each other, a positioning segment for guaranteeing the concentricity of external diameters of two adjacent screws is designed, the combination of axial seal and end face seal is adopted for guaranteeing the sealing; screw heads are threadedly connected with a screw body at the metering section, and the screw body at the metering section is provided with a larger water channel. According to the invention, the different-diameter extrusion screw is adopted, the maximum production capacity of the first step cold feed screw using forced cold feed is released handily, the production efficiency of the cold feed vented extruder can be greatly raised, and the unit energy consumption can be reduced.
Description
(1) technical field:
The present invention relates to rubber cold-feed degassing extruder parts, particularly a kind of cold feeding vented extruder reducing extrusion screw rod.
(2) background technology:
Cold feeding vented extruder is a kind of equipment commonly used in the rubber processing process, and its core component is exactly an extrusion screw rod, and whether the structure of extrusion screw rod rationally directly influences the serviceability of whole equipment.
Mostly common extrusion screw rod is the isometrical screw rod of second order; Can regard as by two common screws and be in series, first rank are common cold feed screw, carry out forced feed through the feeding seat that has feeding roller after; Sizing material gets into second rank through first metering section with thin logical section then through plastifying, heating; Second rank are hot feed screw, through the structure of adjustment exhaust section screw rod, increase spiral groove depth, increase lead; Make sizing material not be full of screw channel, at the machine barrel of exhaust section exhaust outlet is set and vacuumizes, under higher temperature and negative pressure acting in conjunction at exhaust section; Water evaporates in the sizing material is the also gasification simultaneously of gaseous state, some solvents and volatile monomer; Little air together with being mingled with originally in the sizing material is taken away by vavuum pump, thereby has realized the sizing material exhaust, and sizing material is through overcompression then; Through the stable head that gets into of second metering section, again through lips gap extrusion molding rubber.This shows that the primary condition of degassing extruder operate as normal is that the first rank screw rod is identical with the production capacity of the second rank screw rod.
The isometrical screw rod of common second order is because first rank are the cold feeding of pressure; Second rank are equivalent to free hot feeding, and for guaranteeing exhaust efficiency, its second rank screw rod is equivalent to inadequate feeding; So the front and back theoretical maximum production capacities of two rank screw rods have huge difference; Two rank production capacity balances before and after can only realizing through the production capacity that limits the first rank screw rod make the production capacity of degassing extruder have only same specification with 50%～60% of pin cold feed extruder under the rotating speed, and when sizing material replacing or the change of extrusion die replacing causing head pressure; Front and back two rank production capacity balances are easy to broken; Overflow occurs or extrude wave phenomenon, exhaust efficiency can't guarantee if the pursuit production capacity promotes then, and exhaust effect is unstable.
(3) summary of the invention:
The purpose of this invention is to provide a kind of cold feeding vented extruder reducing extrusion screw rod, its purpose is to solve that the degassing extruder production capacity is low, and adaptive capacity is poor, and the exhaust effect problem of unstable is to improve and to enlarge the application level and the scope of existing degassing extruder.
Can realize the cold feeding vented extruder reducing extrusion screw rod of above-mentioned purpose, comprise second order screw rod or multistage screw rod, different is for realizing the production capacity balance, the major diameter of thread sublevel change of said each rank screw rod active section.
The conventional second order screw rod that adopts of cold feeding vented extruder, said second order screw rod comprises that the first rank screw rod is the cold feed screw and the second rank screw rod instant heating feed screw.By extruding direction, said cold feed screw active section is respectively feeding section, fluxing zone, first metering section and Bao Tongduan, and said hot feed screw active section is respectively exhaust section, compression section and second metering section; For reaching the production capacity balance, the major diameter of thread of said hot feed screw active section is greater than the major diameter of thread of cold feed screw active section, promptly under the situation that the major diameter of thread of cold feed screw active section remains unchanged, strengthens the major diameter of thread of hot feed screw active section.
Owing to strengthened the major diameter of thread of hot feed screw active section, the production capacity of hot feed screw obtains discharging, and makes forward and backward two rank screw rods be in operation and realization production capacity balance under a kind of stable state.
The three cubed ratio of the cube of said cold feed screw active section major diameter of thread and hot feed screw active section major diameter of thread is 0.5～0.7.
The three cubed preferred ratio of the cube of said cold feed screw active section major diameter of thread and hot feed screw active section major diameter of thread is 0.5,0.55,0.6,0.65,0.7.
Said second order screw rod or multistage screw rod can be overall structure; Second order screw rod or multistage screw rod also can be the branch body structure, when sizing material characteristic or other external condition take place than about-face, change wherein single order screw rod like this, satisfy the adaptability requirement.
In the branch body structure of said second order screw rod or multistage screw rod; Can adopt screw thread to spin between each rank screw rod; Connecting portion is designed with the positioning section that guarantees adjacent two rank screw rod external diameter axialities, and adopts axial seal and end face seal to guarantee the sealing of junction screw rod water channel.
The screw head of said second order screw rod or the last single order screw rod of multistage screw rod is connected on the screw rod body at metering section place with screw thread or welding manner, and the screw rod body of being convenient at the metering section place sets out bigger screw rod water channel, thereby better controls the glue temperature, alleviates screw rod weight.
Advantage of the present invention:
1, cold feeding vented extruder reducing extrusion screw rod of the present invention has changed the pattern that the cold feed screw production capacity in traditional adjusting first rank adapts to the hot feed screw production capacity in second rank; Diameter through adjusting the hot feed screw in second rank is realized the production capacity balance; Discharge the production capacity of degassing extruder to greatest extent; Enhance productivity, reduce specific energy consumption.
2, screw rod of the present invention can adopt overall structure, also can adopt the branch body structure, and adjacent front and back two rank screw rods adopt to be threaded and are convenient for changing, through the great change that more brings generation such as the external condition that adapts to the sizing material characteristic of screw rod.
3, last single order screw head of the present invention can adopt split type being threaded or Welding Structure, strengthens the inner water channel sectional area of this rank screw metering section, helps controlling the sizing material temperature that gets into head, improves and extrudes stability.
(4) description of drawings:
Fig. 1 is the structural representation of one embodiment of the present invention.
Fig. 2 is the further refinement of Fig. 1 embodiment structure.
Fig. 3 is the enlarged drawing of screw flight junction, two rank structure in Fig. 2 embodiment.
Fig. 4 is the enlarged drawing of vented screw head construction in Fig. 2 embodiment.
Figure number sign: 1, second order screw rod; 2, cold feed screw; 3, hot feed screw; 4, screw rod water channel; 5, screw head; 6, axial seal; 7, end face seal; 8, positioning section; 9, screw rod body.
(5) specific embodiment:
Below in conjunction with accompanying drawing technical scheme of the present invention is described further.
The extrusion screw rod conventional design of cold feeding vented extruder is a second order screw rod 1 as shown in Figure 1; Along extruding direction, the first rank screw rod of second order screw rod 1 is that cold feed screw 2, the second rank screw rods are hot feed screw 3, is split-type structural between said cold feed screw 2 and the hot feed screw 3, between the two through the thread connecting mode series connection.
Said cold feed screw 2 begins from feeding, and its active section (adopt production capacity is high, plasticizing effect is good, extrude the peg type structure stable, that adaptive capacity is strong) can be divided into feeding section, fluxing zone, first metering section and Bao Tongduan successively; The active section of said hot feed screw 3 can be divided into exhaust section, compression section and second metering section successively; Cold feed screw 2 is located at Bao Tongduan with the threaded connection place of hot feed screw 3; The junction is designed with the positioning section 8 that guarantees forward and backward two-stage screw rod external diameter axiality; And the sealing of the employing axial seal 6 and the screw rod water channel 4 of end face seal 7 assurance second order screw rods 1 junction, like Fig. 2, shown in Figure 3.
For ease of leading portion at hot feed screw 3; (big water channel can alleviate screw rod weight to process bigger screw rod water channel 4 in the screw rod body 9 at instant heating feed screw 3 second metering section places; Reduce the influence of screw rod deadweight, also help controlling the sizing material temperature, improve and extrude stability); The screw head 5 of hot feed screw 3 and the screw rod body of second metering section 9 adopt and divide body structure; Said screw head 5 can be welded on the screw rod body 9, and also can be screwed on the screw rod body 9 through screw thread (needs through taking seal approach to guarantee that sealing surface between the two is water-tight), as shown in Figure 4.
Be the balance production capacity; The major diameter of thread of said hot feed screw 3 active sections is greater than the major diameter of thread of cold feed screw 2 active sections; Magnitude relationship between both active section major diameter of threads should satisfy: cold feed screw 2 active section major diameter of thread cube and the three cubed ratio of hot feed screw 3 active section major diameter of threads are between 0.5～0.7, and the best value in this interval is respectively 0.5,0.55,0.6,0.65,0.7.
The above is merely the embodiment of a kind of second order screw rod 1 of the present invention, if by finer functional requirement, extrusion screw rod then can be subdivided into multistage screw rod again.All any modifications of within scope disclosed by the invention, being made, be equal to replacement, improvement etc., all be included within protection scope of the present invention.
Claims (7)
1. cold feeding vented extruder reducing extrusion screw rod comprises second order screw rod (1) or multistage screw rod, it is characterized in that: for realizing the production capacity balance, the major diameter of thread sublevel of said each rank screw rod active section changes.
2. cold feeding vented extruder reducing extrusion screw rod according to claim 1; It is characterized in that: said second order screw rod (1) comprises that the first rank screw rod is the cold feed screw (2) and the second rank screw rod instant heating feed screws (3); By extruding direction; Said cold feed screw (2) active section is respectively feeding section, fluxing zone, first metering section and Bao Tongduan; Said hot feed screw (3) active section is respectively exhaust section, compression section and second metering section, and the major diameter of thread of said hot feed screw (3) active section is greater than the major diameter of thread of cold feed screw (2) active section.
3. cold feeding vented extruder reducing extrusion screw rod according to claim 2 is characterized in that: said cold feed screw (2) active section major diameter of thread cube and the three cubed ratio of hot feed screw (3) active section major diameter of thread are 0.5～0.7.
4. cold feeding vented extruder reducing extrusion screw rod according to claim 3 is characterized in that: the best value of said cold feed screw (2) active section major diameter of thread cube and hot feed screw (3) active section major diameter of thread cube ratio is respectively 0.5,0.55,0.6,0.65,0.7.
5. according to any described cold feeding vented extruder reducing extrusion screw rod in the claim 1～4, it is characterized in that: said second order screw rod (1) or multistage screw rod are overall structure or are the branch body structure.
6. cold feeding vented extruder reducing extrusion screw rod according to claim 5; It is characterized in that: in the branch body structure of said second order screw rod (1) or multistage screw rod; Adopt between each rank screw rod and be threaded; Connecting portion is designed with the positioning section (8) that guarantees adjacent two rank screw rod external diameter axialities, and adopts axial seal (6) and end face seal (7) to guarantee the sealing of junction screw rod water channel (4).
7. according to any described cold feeding vented extruder reducing extrusion screw rod in the claim 1～4; It is characterized in that: the screw head (5) of said second order screw rod (1) or the last single order screw rod of multistage screw rod is connected with screw thread or welding manner on the screw rod body (9) at metering section place, and the screw rod body (9) in the metering section place sets out bigger screw rod water channel (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210281671.0A CN102794901B (en) | 2012-08-09 | 2012-08-09 | Different-diameter extrusion screw of cold feed vented extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210281671.0A CN102794901B (en) | 2012-08-09 | 2012-08-09 | Different-diameter extrusion screw of cold feed vented extruder |
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| Publication Number | Publication Date |
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| CN102794901A true CN102794901A (en) | 2012-11-28 |
| CN102794901B CN102794901B (en) | 2015-03-11 |
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| CN201210281671.0A Active CN102794901B (en) | 2012-08-09 | 2012-08-09 | Different-diameter extrusion screw of cold feed vented extruder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105984109A (en) * | 2015-01-27 | 2016-10-05 | 青岛软控机电工程有限公司 | Extruder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201009420Y (en) * | 2006-12-31 | 2008-01-23 | 刘文韬 | Novel double-screw extruder |
| CN202727310U (en) * | 2012-08-09 | 2013-02-13 | 桂林橡胶设计院有限公司 | Different-diameter extrusion screw of cold-feed exhausting extruder |
-
2012
- 2012-08-09 CN CN201210281671.0A patent/CN102794901B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201009420Y (en) * | 2006-12-31 | 2008-01-23 | 刘文韬 | Novel double-screw extruder |
| CN202727310U (en) * | 2012-08-09 | 2013-02-13 | 桂林橡胶设计院有限公司 | Different-diameter extrusion screw of cold-feed exhausting extruder |
Non-Patent Citations (1)
| Title |
|---|
| 孔亚威等: "冷喂料排气挤出机的设计原理", 《橡胶技术与装备》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105984109A (en) * | 2015-01-27 | 2016-10-05 | 青岛软控机电工程有限公司 | Extruder |
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| CN102794901B (en) | 2015-03-11 |
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