CN1218827C - Stable flow regulator of screw extruder - Google Patents
Stable flow regulator of screw extruder Download PDFInfo
- Publication number
- CN1218827C CN1218827C CNB021592896A CN02159289A CN1218827C CN 1218827 C CN1218827 C CN 1218827C CN B021592896 A CNB021592896 A CN B021592896A CN 02159289 A CN02159289 A CN 02159289A CN 1218827 C CN1218827 C CN 1218827C
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- China
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- head
- regulating block
- machine head
- screw
- screw extruder
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- Expired - Fee Related
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The present invention relates to a stable flow regulator of a screw extruder, which is composed of a machine head composed of a neck mould, a pressure plate, a machine head body, a core rod and a machine head connecting body, a transmission system and a measurement control system, wherein the machine head body is a component and is composed of a machine head front body, a machine head rear body and a regulating block; the two stages of the inner surface of the regulating block respectively form a movable fit with a sideway of the machine head front body and a sideway of the machine head rear body; the outer surface of the regulating block and the inner surface of the machine head front body form a movable fit; a screw rod and the regulating block form screw connection; signals output by the measurement control system are used for controlling the rotary speed of a servo motor; the servo motor drives the screw rod to rotate by the transmission system, so the regulating block is driven to carry out axial reciprocating movement in the sideways of the machine head front body and the machine head rear body. The stable flow regulator of a screw extruder can be matched with a single screw extruder and a double screw extruder to enhance extruded product precision by stable flow regulation.
Description
Technical field the present invention is the improvement to existing screw extruder head, can with the supporting use of single, double screw extruder, regulate by current stabilization and to improve the extruded product precision.
Background technology is used for screw extruder and the direct-connected production line of head that macromolecular material is extruded processing, because the screw rod of extruder had both played the effect of melting mixing material, play the effect of build-up pressure again, in extrusion process, owing to be subjected to the character of material, the feeding fluctuation, reclaimed materials admixture ratio, operating procedure condition variation or the like all multifactor influences, the pressure oscillation of fused mass when the extruder porous plate flows out is bigger, thereby cause the fluctuation of extruding output, make goods produce error along the size of extruding each cross section on the direction, the precision of fabricated product is extruded in influence.Common extruder head mainly is made up of mouth mould, pressing plate, handpiece body, plug and the head connector of moulded products outer surface, and the inner surface of handpiece body is generally inner conical surface, and this face is not a continuous transition surface if article outer surface is not cylindrical.The cross section of fluid channel shape and the size of handpiece body are all fixed, and it is uncontrollable therefore extruding flow rate.
Summary of the invention
Screw extruder current stabilization adjusting device of the present invention is the improvement to common extruder head structure, a kind of mechanism that the screw extruder smelt flow is measured stabilization is proposed, being equipped with one in the handpiece body can axially movable regulating block, make the stationary flowpath in the handpiece body become the runner that can change sectional dimension, make the flow of the fused materials of from machine head port mould, extruding more stable, the variation of extruding flow that minimizing causes with extrusion pressure fluctuation or other reasons, thus the precision of goods can be improved.
Common extruder head is made up of mouth mould 1, pressing plate 2, handpiece body 3, plug 4, head connector 5 as shown in Figure 1.
The head part of invention screw extruder current stabilization adjusting device: mouthful mould, pressing plate, plug are identical with common extruder head with the head connector.
Technical scheme of the present invention is as follows: head that screw extruder current stabilization adjusting device is made up of mouth mould, pressing plate, handpiece body, plug, head connector and transmission system and Measurement and Control System constitute; Handpiece body is an assembly, handpiece body by head precursor, head after body and regulating block form; Two sections of the regulating block inner surface respectively with head precursor slideway and head after the body slideway movingly, regulating block inner surface stage casing is a round slip surface, regulating block outer surface and head precursor inner surface are movingly, leading screw is threaded with regulating block, there are step and head connector location in one termination of leading screw, fixedlys connected with keeper in another termination of leading screw; The rotating speed of the signal controlling servomotor of Measurement and Control System output; Servomotor drives leading screw by transmission system and rotates, and makes axially reciprocating in the body slideway thereby drive regulating block behind head precursor slideway and head.Transmission system is made up of screw gear, adjusting gear ring and travelling gear.Measurement and Control System is made up of gauging instrument and microprocessor.Keeper is back-up ring or thrust bearing.Leading screw and corresponding supporting screw gear thereof are 2 to 4 covers.Regulating block outer surface and head precursor inner surface are cylindrical or prismatic (cross section is square, rectangle, hexagon etc.).
The used gauging instrument of the present invention is to calibrate or the gauging instrument of thickness measuring, with the signal input microprocessor of gauging instrument output.Existing extruding production line generally all is provided with the hauling speed control device, available microprocessors of the present invention promptly replaces original traction control apparatus again as control processor of the present invention, the product size signal that this moment, microprocessor can be imported measuring instrument and the linear velocity value of existing production line are carried out computing and are drawn the extrudate flow rate score as feedback signal, move by driving transmission system drive regulating block by servomotor, the motion of transmission system is controlled by the feedback signal through microprocessor processes.
According to the following theory of extruding: extruder is when stable extruding, and the pass between flow rate by head and head pressure at two ends fall is:
Q＝K
QΔP/η
In the formula: the Q-volume flow, K falls in Δ P-head pressure at two ends
Q-die shape coefficient, the viscosity of melt in the η head.
When the pressure of extruder homogenizing zone end produces fluctuation, will cause variation, therefore by the volume flow rate of head, when Δ P changes, under the situation that keeps head outlet size, shape invariance,, can make the die shape COEFFICIENT K by changing the cross section of fluid channel parameter
QChange, thereby make K
QIt is constant that the value of Δ P keeps, and the Q value is remained unchanged.Extruder current stabilization adjusting device is handled moving of regulating block by the signal value accessory drive of the representative flow rate of microprocessor output, fast the moving of adjusting of control current stabilization governor motion changes the flow channel cross section parameter, directly produces stable effect of extruding flow.
In extrusion, determine to set flow rate value according to extruding fabrication process condition, when the flow rate of extrusion melt equals to set value, it is motionless that regulating block is positioned at the centre position, when the flow rate of extrusion melt surpassed setting value, regulating block moved to the head Way in, reduces K
QValue reduces flow rate.Regulating block moves to the head Way out when the flow rate of extrusion melt is lower than setting value.Increase K
QValue increases flow rate.
With moving and mobile limiting value of microprocessor control and regulation piece.When the signal value of the representative flow rate of microprocessor output during less than setting value, move by the forward of regulating block, thereby changed the flow channel cross sectional shape, make K
QValue improves, and increases the flow of melt extrusion, when the signal value of the representative flow rate of microprocessor output during greater than setting value, by oppositely moving of regulating block, and makes K
QValue reduces, and reduces the flow of melt extrusion.Adopt current stabilization adjusting device of the present invention can significantly reduce the fluctuation of extruding output of extruder extrusion melt, guarantee the state compacted under of goods, effectively raise the dimensional accuracy of extruded product at stable melt flow rate.Current stabilization adjusting device of the present invention is different from existing mouthful of mould governor motion, and existing mouth mould governor motion is that the mouth mould shape and size of the final cross sectional shape that forms goods are mediated, to guarantee having identical sectional dimension on same cross section.Use this current stabilization adjusting device can reduce goods, therefore can improve the precision of goods along the error of extruding each cross section on the direction.
Current stabilization adjusting device of the present invention is applicable to that various screw extruders extrude the extruded product of different shape.
Description of drawings
Fig. 1 is the structure chart of common extruder head.
Fig. 2 is the front view of screw extruder current stabilization adjusting device of the present invention.
Fig. 3 is that A among Fig. 2 is to view.
Fig. 4 is the B-B cutaway view among Fig. 2.
The specific embodiment
Embodiment
As Fig. 2, Fig. 3 and shown in Figure 4, head that screw extruder current stabilization adjusting device of the present invention is made up of mouth mould 1, pressing plate 2, handpiece body, plug 4, head connector 5 and transmission system and Measurement and Control System constitute; Handpiece body is an assembly, handpiece body by head precursor 3-1, head after body 3-2 and regulating block 3-3 form; Two sections 3-3A of regulating block inner surface respectively with head precursor slideway 3-1A and head after body slideway 3-2A movingly, regulating block inner surface stage casing 3-3B is round slip surface (identical with the shape of common extruder head correspondence position), regulating block outer surface 3-3C and head precursor inner surface 3-1B are movingly, leading screw 6 is threaded with regulating block 3-3, there are step 6-1 and head connector 5 location in one termination of leading screw 6, fixedlys connected with keeper 8 in another termination of leading screw 6; The rotating speed of the signal controlling servomotor 10 of Measurement and Control System output; Servomotor 10 drives leading screw 6 by transmission system and rotates, and makes axially reciprocating in the body slideway 3-2A thereby drive regulating block 3-3 behind head precursor slideway 3-1A and head.Transmission system is made up of screw gear 7, adjusting gear ring 9 and travelling gear 11.Measurement and Control System is made up of gauging instrument 12 and microprocessor 13.Keeper 8 is a back-up ring.Leading screw 6 and corresponding supporting screw gear 7 thereof are 4 covers, that is: regulating block 3-3 is provided with 4 screwed holes and cooperates with 4 leading screws 6.Regulating block outer surface 3-3C and head precursor inner surface 3-1B are cylindrical.Step 6-1 on keeper 8 and the leading screw 6 plays the axial location effect, leading screw 6 can only be rotated and can not move vertically.Gauging instrument 12 adopts the JDC-J1 caliper, is installed in the peripheral position of the extruded product of head outlet.The moving range that the mobile limiting value of setting regulating block 3-3 by microprocessor 13 controls to adjust piece 3-3 less than regulating block 3-3 and head precursor 3-1 and head after body 3-2 in axial spacing.
Claims (6)
1, the head be made up of mouth mould (1), pressing plate (2), handpiece body, plug (4), head connector (5) of screw extruder current stabilization adjusting device and transmission system and Measurement and Control System constitute; Handpiece body is an assembly, handpiece body by head precursor (3-1), head after body (3-2) and regulating block (3-3) form; Two sections (3-3A) of regulating block inner surface respectively with head precursor slideway (3-1A) and head after body slideway (3-2A) movingly, regulating block inner surface stage casing (3-3B) is a round slip surface, regulating block outer surface (3-3C) and head precursor inner surface (3-1B) are movingly, with head precursor (3-1), leading screw (6) is threaded with regulating block (3-3), there are step (6-1) and head connector (5) location in one termination of leading screw (6), fixedlys connected with keeper (8) in another termination of leading screw (6); Signal controlling servomotor (10) rotating speed of Measurement and Control System output; Servomotor (10) drives leading screw (6) by transmission system and rotates, and makes axially reciprocating in the body slideway (3-2A) thereby drive regulating block (3-3) behind head precursor slideway (3-1A) and head.
2, device according to claim 1 is characterized in that: transmission system is made up of screw gear (7), adjusting gear ring (9) and travelling gear (11).
3, device according to claim 1 is characterized in that: Measurement and Control System is made up of gauging instrument (12) and microprocessor (13).
4, device according to claim 1 is characterized in that: keeper (8) is back-up ring or thrust bearing.
5, device according to claim 1 and 2 is characterized in that: leading screw (6) and corresponding supporting screw gear (7) thereof are 2 to 4 covers.
6, device according to claim 1 is characterized in that: regulating block outer surface (3-3C) is cylindrical or prismatic with head precursor inner surface (3-1B).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021592896A CN1218827C (en) | 2002-12-30 | 2002-12-30 | Stable flow regulator of screw extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021592896A CN1218827C (en) | 2002-12-30 | 2002-12-30 | Stable flow regulator of screw extruder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1511695A CN1511695A (en) | 2004-07-14 |
| CN1218827C true CN1218827C (en) | 2005-09-14 |
Family
ID=34237413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021592896A Expired - Fee Related CN1218827C (en) | 2002-12-30 | 2002-12-30 | Stable flow regulator of screw extruder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1218827C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101954732A (en) * | 2010-09-30 | 2011-01-26 | 北京化工大学 | Cone-shaped single-screw extruder with parallel screw head section |
| CN109571954B (en) * | 2019-01-29 | 2024-03-05 | 牟振如 | Adjustable slit type extrusion head |
-
2002
- 2002-12-30 CN CNB021592896A patent/CN1218827C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1511695A (en) | 2004-07-14 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Application publication date: 20040714 Assignee: Jiyuan Lanman Energy-Saving Technology Co., Ltd. Assignor: Beijing University of Chemical Technology Contract record no.: 2012990000699 Denomination of invention: Stable flow regulator of screw extruder Granted publication date: 20050914 License type: Exclusive License Record date: 20120924 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050914 Termination date: 20141230 |
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| EXPY | Termination of patent right or utility model |