CN110789095A - Method for stabilizing outlet pressure of screw extruder and constant-pressure machine head of screw extruder - Google Patents
Method for stabilizing outlet pressure of screw extruder and constant-pressure machine head of screw extruder Download PDFInfo
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- CN110789095A CN110789095A CN201810781385.8A CN201810781385A CN110789095A CN 110789095 A CN110789095 A CN 110789095A CN 201810781385 A CN201810781385 A CN 201810781385A CN 110789095 A CN110789095 A CN 110789095A
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- piston
- screw extruder
- pressure
- barrel
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 13
- 238000001125 extrusion Methods 0.000 claims abstract description 7
- 230000006641 stabilisation Effects 0.000 claims 2
- 238000011105 stabilization Methods 0.000 claims 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 229920001971 elastomer Polymers 0.000 abstract description 21
- 239000005060 rubber Substances 0.000 abstract description 21
- 239000000463 material Substances 0.000 abstract description 11
- 150000001875 compounds Chemical class 0.000 description 7
- 239000006229 carbon black Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 244000043261 Hevea brasiliensis Species 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 229920003052 natural elastomer Polymers 0.000 description 2
- 229920001194 natural rubber Polymers 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229920003051 synthetic elastomer Polymers 0.000 description 2
- 239000005061 synthetic rubber Substances 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010057 rubber processing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
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- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a screw extruder outlet pressure stabilizing method and a screw extruder constant pressure head, wherein the screw extruder constant pressure machine comprises a discharge barrel, one end of the discharge barrel is connected with the discharge end of a screw extruder barrel, at least one axial discharge port is arranged on the barrel body of the discharge barrel, a piston sleeve communicated with the discharge barrel is arranged at the other end of the discharge barrel, a piston in the piston sleeve is matched with the barrel diameter of the discharge barrel, the piston axially moves in the discharge barrel under the control of a liquid flow pressure stabilizing system and is positioned at a position balanced with the extrusion pressure in the discharge barrel, and the balanced position of the piston corresponds to the size of the discharge port opened by the piston. The invention can set the pressure of the cylinder, particularly the pressure of the outlet according to the mixing requirement of the rubber material, and can automatically keep the pressure at the outlet of the extruder stable, thereby keeping the consistent performance of the mixed rubber material.
Description
Technical Field
The invention relates to screw extruder equipment, in particular to a method for stabilizing outlet pressure of a screw extruder and a constant-pressure machine head of the screw extruder.
Background
In the rubber and plastic processing industry, a screw extruder is a mixing, dispersing, plasticizing and molding device, and particularly in the rubber processing industry, the screw extruder is often used as a supplementary mixing, dispersing and plasticizing device for rubber after banburying in an internal mixer.
For a certain configuration of screw extruder, the mixing, dispersing and plasticizing effects are closely related to the pressure in the cylinder. However, the pressure of the cylinder is changed by the influence of the resistance of the machine head, the screw rotation speed, the feeding state, the physical properties of the rubber compound, the thermal state and the like, and is not very stable or even very fluctuated, so that the rubber compound mixing performance is greatly different, and the quality stability of products is seriously influenced.
The existing method for controlling the pressure inside the machine barrel of the extruder is to add a throttling mechanism similar to a valve at the outlet of the machine barrel and control the pressure inside the machine barrel by controlling the flow cross section and the flow of extruded rubber. However, the flow cross-sectional area of the throttling mechanism cannot be automatically adjusted along with the pressure change in the cylinder, and the pressure in the cylinder cannot be preset according to the conditions of viscoelasticity, feeding state, screw rotation speed and the like of rubber, and needs to be manually adjusted in real time according to experience.
Therefore, the conventional extruder cannot set a required internal cylinder pressure in advance and cannot maintain the pressure in the cylinder stably.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method for stabilizing the outlet pressure of a screw extruder and a constant-pressure machine head of the screw extruder.
The invention relates to a method for stabilizing outlet pressure of a screw extruder, which adopts the technical scheme that a piston controlled by a liquid flow pressure stabilizing system is matched in a discharge cylinder at the discharge end of a machine cylinder of the screw extruder, the liquid flow pressure stabilizing system can set output pressure and automatically keep the pressure stable, the piston axially moves in the discharge cylinder under the control of the liquid flow pressure stabilizing system and is positioned at a position balanced with the extrusion pressure in the discharge cylinder, and the balance position of the piston determines the size of an opening of a discharge port on the cylinder body of the discharge cylinder.
One structure of the liquid flow pressure stabilizing system comprises a piston oil cylinder, a piston rod of the piston oil cylinder is connected with a piston, and an oil inlet and an oil outlet of the piston oil cylinder are connected to a hydraulic control loop.
In order to realize the integrated mounting structure, the piston oil cylinder is connected with the discharge barrel through a piston sleeve, and the piston is arranged in the piston sleeve.
One conventional configuration of the discharge port is to taper axially from the discharge end of the barrel of the screw extruder.
The discharge port is preferably in an isosceles sector shape.
The invention relates to a constant pressure machine head of a screw extruder, which adopts the technical scheme that the constant pressure machine head comprises a discharge barrel, wherein one end of the discharge barrel is connected with the discharge end of a machine barrel of the screw extruder in an installing manner, the other end of the discharge barrel is provided with a piston matched with the diameter of the discharge barrel, the piston axially moves in the discharge barrel under the control of a liquid flow pressure stabilizing system and is positioned at a position balanced with the extrusion pressure in the discharge barrel, and the balanced position of the piston corresponds to the size of a discharge hole on the discharge barrel opened by the piston.
One structure of the liquid flow pressure stabilizing system comprises a piston oil cylinder, a piston rod of the piston oil cylinder is connected with a piston, and an oil inlet and an oil outlet of the piston oil cylinder are connected to a hydraulic control loop.
In order to realize the integrated mounting structure, the piston oil cylinder is connected with the discharge barrel through a piston sleeve, and the piston is arranged in the piston sleeve.
One conventional configuration of the discharge port is to taper axially from the discharge end of the barrel of the screw extruder.
The discharge port is preferably in an isosceles sector shape.
The invention has the beneficial effects that:
the method for stabilizing the outlet pressure of the screw extruder and the constant pressure handpiece of the screw extruder can set the barrel pressure, particularly the pressure at the outlet end according to the mixing requirement of rubber materials, and can automatically keep the pressure at the outlet of the extruder stable, thereby keeping the performance of the mixed rubber materials consistent.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a perspective view of the discharge cylinder in the embodiment of fig. 1.
Fig. 3 is a combined structure view of a piston and a piston sleeve in the embodiment of fig. 1.
Fig. 4 is a schematic structural diagram of the piston cylinder in the embodiment of fig. 1, showing a connection relationship between the piston rod and the piston.
FIG. 5 is a plot of head pressure of an extruder versus Mooney viscosity of the compound.
And (3) identifying the figure number: 1. a discharging barrel; 1-1, the left end of the cylinder mouth; 2. a discharge port; 3. a piston; 4. a piston sleeve; 4-1, sleeve body; 5. a piston cylinder; 6. a piston rod; 9. a hydraulic control circuit.
Detailed Description
The technical solution of the present invention will be further explained with reference to the embodiments shown in the drawings.
The invention relates to a constant pressure machine head of a screw extruder, which structurally comprises a discharge barrel 1, a piston sleeve 4, a piston oil cylinder 5 and a hydraulic control loop 9.
The discharge tube comprises a discharge tube 1 (the length of which is 360mm), a discharge tube opening left end 1-1 and a discharge end mounting connection (flange connection structure) of a single-screw extruder barrel (the inner diameter of the tube is 120mm) of the discharge tube 1, wherein an isosceles fan-shaped discharge opening 2 is arranged between two sides of the discharge tube 1, the discharge tube 1 is axially from left to right, the circumferential size of the discharge opening 2 is gradually increased, the axial length of the left end and the right end of the discharge opening 2 is 283mm, the left end is pointed, the right end is bottom end, the circumferential length of the bottom end is 80mm, the discharge tube is close to the joint of the single-screw extruder barrel and the discharge tube 1, and a thermometer for measuring the extrusion temperature and a pressure gauge for detecting the extrusion pressure are arranged on.
The left end of a sleeve body 4-1 of the piston sleeve 4 is connected with the right end of the discharge barrel 1 in an installing mode (a flange connecting structure), a piston 3 (the length is 550mm) in the piston sleeve 4 enters the barrel body of the discharge barrel 1 leftwards, and the piston 3 has an outer diameter size (phi 120mm) matched with the inner diameter of the discharge barrel 1.
The left end of the piston oil cylinder 5 is connected with the right end of the piston sleeve 4 in an installing mode (flange connection structure), a piston rod 6 of the piston oil cylinder 5 enters the cylinder body of the piston sleeve 4 and is connected with the piston 3, the stroke of the piston rod 6 entering the piston sleeve 4 is 360mm, the oil inlet and the oil outlet of the piston oil cylinder 5 are connected to a hydraulic control loop 9 (comprising hydraulic components such as a motor, a hydraulic pump, an overflow valve and a direction control valve), and the hydraulic control loop 9 can set the constant pressure of the piston oil cylinder 5 to be 0-25 MPa.
The working principle of the invention is as follows:
the hydraulic control circuit 9 can set output pressure and automatically keep the pressure stable, the hydraulic control circuit 9 controls a piston rod 6 in a piston oil cylinder 5, the piston rod 6 is linked with a piston 3 in a piston sleeve 4, the piston 3 controls the flow area of a discharge port 2 of the discharge cylinder 1, and the flow area of the discharge port 2 changes along with the pressure of the piston 3 and also along with the pressure of an outlet of a cylinder of the single-screw extruder.
When the output pressure of the hydraulic control circuit 9 is fixed, the size of the flow area of the discharge port 2 only changes along with the outlet pressure of the cylinder of the single-screw extruder, and the outlet pressure of the cylinder of the single-screw extruder is consistent with the pressure of the piston 3; when factors influencing the productivity of the extruder, such as the feeding amount of a feeding port of the single-screw extruder, the rotating speed of a screw, the viscoelasticity of fed rubber materials and the like, change, the size of the flow area of the discharging port 2 changes correspondingly, the pressure of an outlet of a machine barrel of the single-screw extruder is automatically kept unchanged, and therefore the performance of mixing rubber materials related to the pressure is kept consistent all the time.
The method for keeping the outlet pressure of the screw extruder stable by adopting the constant-pressure machine head of the screw extruder comprises the following steps:
the output pressure is set through the hydraulic control circuit 9 and the pressure is automatically kept stable, the hydraulic control circuit 9 controls the piston rod 6 in the piston cylinder 5 to stretch, the piston rod 6 is connected with the piston 3 in the piston sleeve 4 so as to drive the piston 3 to slide in the piston sleeve 4 and the discharge barrel 1, the opening size (namely the actual flow area size) of the discharge port 2 is determined by the position of the piston 3 at the discharge port 2 of the discharge barrel 1, and the position of the piston 3 in the discharge port 2 depends on the balance position of the pressure set by the hydraulic control circuit 9 and the pressure at the outlet of the single-screw extruder barrel.
The application of the invention is as follows:
the rubber-base rubber material for making semi-steel radial tyre tread mainly contains natural rubber, synthetic rubber, carbon black, white carbon black, sulfur, vulcanization accelerator, etc. Natural rubber, synthetic rubber, carbon black and white carbon black in the formula of the rubber material are firstly mixed and plasticated to a certain Mooney viscosity by an internal mixer at a higher temperature, and then vulcanizing agents such as sulfur and the like are added and uniformly dispersed by an open mill at a lower temperature.
Due to the deviation of raw materials, production process and environment, the viscosity and the dispersity of the final rubber compound do not meet the requirements of the tread manufacturing process. If the internal mixer is used for supplementing mixing, the uniformity of mixing temperature is difficult to control, local high temperature can cause scorching, and if the open mixer is used for supplementing mixing, the efficiency is lower. The key problem is that whether an internal mixer or an open mill is used for supplementary mixing, the conditions of process temperature, pressure and time are difficult to grasp and need to depend on experience to obtain rubber materials with expected viscosity.
The screw extruder is adopted for preparing the invention to supplement and mix the rubber material, so the temperature is easy to control, and the production efficiency is higher.
Specifically, the rubber compound is subjected to supplementary mixing by using the extruder and the constant-pressure head, the Mooney viscosity (ML100 ℃ 1+4)77 of the rubber compound is required to be reduced to 60 ℃ or less after the supplementary mixing, and the supplementary mixing temperature is controlled to be 100 ℃ or less.
Through tests, the relationship curve of the pressure of the screw constant-pressure head of the invention at 100 ℃ and the Mooney viscosity of the rubber compound is shown in FIG. 5. Setting the pressure of a constant-pressure machine head to be 11Mpa, and supplementing and mixing the rubber material to 56-59 nylon viscosity.
Claims (8)
1. The method for stabilizing the outlet pressure of the screw extruder is characterized by comprising the following steps: a piston (3) controlled by a liquid flow pressure stabilizing system is matched in a discharge barrel at the discharge end of a machine barrel of the screw extruder, the liquid flow pressure stabilizing system can set output pressure and automatically keep the pressure stable, the piston (3) axially moves in the discharge barrel (1) under the control of the liquid flow pressure stabilizing system and is positioned at a position balanced with extrusion pressure in the discharge barrel (1), and the balance position of the piston (3) determines the opening size of a discharge port (2) on the barrel body of the discharge barrel (1).
2. The screw extruder outlet pressure stabilization method according to claim 1, characterized in that: the liquid flow pressure stabilizing system comprises a piston oil cylinder (5), a piston rod (6) of the piston oil cylinder (5) is connected with a piston (3), and an oil inlet and an oil outlet of the piston oil cylinder (5) are connected to a hydraulic control loop (9).
3. The screw extruder outlet pressure stabilization method according to claim 2, characterized in that: the piston oil cylinder (5) is connected with the discharge barrel (1) through a piston sleeve (4), and the piston (3) is arranged in the piston sleeve (4).
4. A method of stabilizing the outlet pressure of a screw extruder according to any one of claims 1 to 3, characterized in that: and the discharge port (2) is gradually increased from the discharge end of the machine barrel of the screw extruder along the axial direction.
5. Screw extruder constant pressure aircraft nose, its characterized in that: including going out feed cylinder (1), the one end of going out feed cylinder (1) and the discharge end erection joint of screw extruder barrel, the other end that goes out feed cylinder (1) is equipped with piston (3) of matcing feed cylinder (1) barrel footpath, piston (3) under the control of liquid flow steady voltage system axial displacement in feed cylinder (1) and be in with go out feed cylinder (1) in extrusion pressure balanced position mutually, the balanced position that piston (3) were located is corresponding to piston (3) and opens the size of feed cylinder (1) barrel upper discharge mouth (2).
6. The screw extruder constant pressure head according to claim 5, wherein: the liquid flow pressure stabilizing system is characterized in that a piston rod (6) of the piston oil cylinder (5) is connected with a piston (3), and an oil inlet and an oil outlet of the piston oil cylinder (5) are connected to a hydraulic control loop (9).
7. The screw extruder constant pressure head according to claim 6, wherein: the piston oil cylinder (5) is connected with the discharge barrel (1) through a piston sleeve (4), and the piston (3) is arranged in the piston sleeve (4).
8. A screw extruder constant pressure head according to any one of claims 5 to 7, characterized in that: and the discharge port (2) is gradually increased from the discharge end of the machine barrel of the screw extruder along the axial direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810781385.8A CN110789095B (en) | 2018-07-17 | 2018-07-17 | Screw extruder outlet pressure stabilizing method and screw extruder constant pressure machine head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810781385.8A CN110789095B (en) | 2018-07-17 | 2018-07-17 | Screw extruder outlet pressure stabilizing method and screw extruder constant pressure machine head |
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| CN110789095A true CN110789095A (en) | 2020-02-14 |
| CN110789095B CN110789095B (en) | 2024-09-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112497700A (en) * | 2020-11-11 | 2021-03-16 | 浙江工业职业技术学院 | Pressure balance mechanism |
| CN112497701A (en) * | 2020-11-11 | 2021-03-16 | 浙江工业职业技术学院 | Pressure stabilizing system of plastic extruder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03277263A (en) * | 1990-03-26 | 1991-12-09 | Kanebo Ltd | Apparatus for feeding raw material to extruder |
| CN1435310A (en) * | 2002-01-29 | 2003-08-13 | 北京化工大学 | Screw extrusion melt pressure stabilizing device and method |
| CN101166617A (en) * | 2005-04-27 | 2008-04-23 | 倍耐力轮胎股份公司 | Method for extruding a polymeric material and extrusion head therefor |
| CN102001170A (en) * | 2010-03-12 | 2011-04-06 | 北京化工大学 | High molecular material balanced extruder and axial force balancing method thereof |
| CN102653129A (en) * | 2012-05-21 | 2012-09-05 | 贵州大学 | Pressure adjusting method and device of handpiece of screw extruder |
| CN202600507U (en) * | 2012-05-31 | 2012-12-12 | 邱玉佳 | Fluid pressure balancer |
| CN204076775U (en) * | 2014-04-25 | 2015-01-07 | 江苏赛宝龙石化有限公司 | A kind of polystyrene extruded plastic machine |
| CN208714434U (en) * | 2018-07-17 | 2019-04-09 | 桂林橡胶设计院有限公司 | Screw extruder constant pressure head |
-
2018
- 2018-07-17 CN CN201810781385.8A patent/CN110789095B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03277263A (en) * | 1990-03-26 | 1991-12-09 | Kanebo Ltd | Apparatus for feeding raw material to extruder |
| CN1435310A (en) * | 2002-01-29 | 2003-08-13 | 北京化工大学 | Screw extrusion melt pressure stabilizing device and method |
| CN101166617A (en) * | 2005-04-27 | 2008-04-23 | 倍耐力轮胎股份公司 | Method for extruding a polymeric material and extrusion head therefor |
| CN102001170A (en) * | 2010-03-12 | 2011-04-06 | 北京化工大学 | High molecular material balanced extruder and axial force balancing method thereof |
| CN102653129A (en) * | 2012-05-21 | 2012-09-05 | 贵州大学 | Pressure adjusting method and device of handpiece of screw extruder |
| CN202600507U (en) * | 2012-05-31 | 2012-12-12 | 邱玉佳 | Fluid pressure balancer |
| CN204076775U (en) * | 2014-04-25 | 2015-01-07 | 江苏赛宝龙石化有限公司 | A kind of polystyrene extruded plastic machine |
| CN208714434U (en) * | 2018-07-17 | 2019-04-09 | 桂林橡胶设计院有限公司 | Screw extruder constant pressure head |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112497700A (en) * | 2020-11-11 | 2021-03-16 | 浙江工业职业技术学院 | Pressure balance mechanism |
| CN112497701A (en) * | 2020-11-11 | 2021-03-16 | 浙江工业职业技术学院 | Pressure stabilizing system of plastic extruder |
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| Publication number | Publication date |
|---|---|
| CN110789095B (en) | 2024-09-06 |
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Effective date of registration: 20240813 Address after: 541004 No. 77, Qixing Road, Qixing District, Guilin, the Guangxi Zhuang Autonomous Region Applicant after: GUILIN RUBBER DESIGN INSTITUTE Co.,Ltd. Country or region after: China Applicant after: China Chemical Equipment Technology Group Co.,Ltd. Address before: 541004 No. 77, Qixing Road, Qixing District, Guilin, the Guangxi Zhuang Autonomous Region Applicant before: GUILIN RUBBER DESIGN INSTITUTE Co.,Ltd. Country or region before: China |
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