CN101856862B - Injection apparatus possible back pressure control - Google Patents
Injection apparatus possible back pressure control Download PDFInfo
- Publication number
- CN101856862B CN101856862B CN2009101638964A CN200910163896A CN101856862B CN 101856862 B CN101856862 B CN 101856862B CN 2009101638964 A CN2009101638964 A CN 2009101638964A CN 200910163896 A CN200910163896 A CN 200910163896A CN 101856862 B CN101856862 B CN 101856862B
- Authority
- CN
- China
- Prior art keywords
- screw rod
- back pressure
- cylinder body
- pressure
- injection
- 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
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Classifications
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/76—Measuring, controlling or regulating
- B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
-
- 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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
- B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
- B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
- B29C2045/547—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw continuously rotating plasticising screw cooperating with a single injection plunger
Abstract
The present invention provides an injection apparatus which controls back pressure through using oil pressure for keeping the back pressure continuous and constant thereby performing excellent injection operation. The injection apparatus of the invention is provided with a screw, a motor for rotation, a motor for advancing and retreating, a ball screw, a ball nut and a connection component. One end of the screw is connected with a connecting rod component. The connecting rod component moves along with reciprocation of the screw. One end of the connecting rod component is connected with a backpressure control cylinder which is connected with a working oil storage container through tubing. The injection apparatus with the structure according to the invention can control the generated back pressure through the cylinder so that the back pressure is continuous and kept constant.
Description
Technical field
The present invention relates to control the injection device of back pressure, relating in more detail can be at the injection device that carries out resin when metering continuous control back pressure.
Background technology
Usually, injection machine is for the device of resin by injection in the mould of making according to the shape of the product that will be shaped, and is made of injection device and mold closing mechanism.Described injection device wherein is following device: by the heat energy of the rotation that is arranged at the inner screw rod of a section (barrel) mechanical energy that produces and the heater generation that is installed on a section outside, make the resin particle fusing of solid shape, in the mould that the resin injection that has melted is made according to the shape of the product that will be shaped and it is solidified, thereby obtain the product of intended shape.
At this moment, being arranged at a screw rod of section inside is made of threaded shank and screw head, wherein, described threaded shank is for delivery of solid shape resin particle and make the fusing of solid shape resin particle, and described screw head is used for preventing resin reverse flow when injecting melting resin in mould.
In order to make the resin fusing, will drop into the cylinder section that heater has been installed from the resin particle that hopper is supplied with, in cylinder section, the screw rod that is connected with hydraulic motor or electro-motor is rotated.Utilization makes the resin fusing by the shear heat of such screw rod generation and the heat that heater produces.Then, make the buildup of resin that melted in the leading portion section of screw head by screw head.
At this moment, in the situation that the force feed melting resin is carried the resin of supplying with from hopper while screw rod retreats to screw head.Thus, resin is piled up continuously to the leading portion section of screw head.When piling up the described melting resin of ormal weight and finishing metering in the leading portion section of screw head, screw rod stops the rotation, and advances vertically with the pressure and the speed that are suitable for molding condition, and the outlet of melting resin from cylinder section pushed in the mould.
Below, be described more specifically with reference to the Fig. 1 that shows this existing injection device.
Existing injection device 100 is made of ball screw 10, screw rod 20, housing 30 and pressure tester (load cell) 40 substantially.
That is, ball screw 10 makes rotatablely moving of the first electro-motor 50 be converted into the advance and retreat reciprocating motion.
In addition, an end of ball screw axle 11 constitutes and connects injection carriage (injection bracket) 80.
Screw rod 20 is connected with the second electro-motor 60, by transmitting revolving force from motor 60, the injection of the resin that screw rod 20 will melt (not shown) forward end.But screw rod 20 has protuberance (not shown) in the neighboring, and the rotation by screw rod 20 can be with resin extruded, so screw rod 20 is not suitable for being connected on the housing 30 described later.
Thereby screw rod 20 also has the extending shaft 21 that extends vertically in the rear end, and screw rod 20 is connected with the second electro-motor 60 through this extending shaft 21, thereby makes the revolving force of the second electro-motor 60 be passed to screw rod 20.
One end of housing 30 is connected with screw rod 20, and the other end of housing 30 is connected with ball screw nut 13, advances and retreat by the advance and retreat drive force screw rod 20 of ball screw nut 13.
More precisely, an end of housing 30 is connected with the extending shaft 21 that prolongation is formed on the screw rod 20, and the other end of housing 30 is connected with ball screw nut 13, and the driving force of ball screw nut 13 is passed to extending shaft 21, and drive screw 20 is advanced and retreat thus.
At this moment, connect housing 30 and extending shaft 21 by bearing 31.That is, housing 30 is driven into to advance by ball screw nut 13 and moves back, and extending shaft 21 is connected with the second electro-motor 60, and rotates simultaneously with screw rod 20.Thus, through bearing 31 housing 30 and extending shaft 21 are linked together, thereby the pressure of housing 30 is passed to extending shaft 21.
Pressure tester 40 is installed on the neighboring of screw rod 20, to by before the housing 30 so that the pressure that puts on the screw rod 20 measure.
But, as mentioned above, having extending shaft 21 in the rear end of screw rod 20, extending shaft 21 is connected with housing 30 through bearing 31, therefore, preferably pressure tester 40 is fixed on the neighboring of extending shaft 21.
This be because, be installed on situation about being formed with on the screw rod 20 of protuberance in the neighboring with pressure tester 40 and compare, pressure tester 40 is installed in the outside of the extending shaft 21 that is connected with housing 30 and directly is subject to the pressure of housing 30, more accurately detected pressures.
According to the existing syringe 100 with this structure, make ball screw axle 11 rotation by the first electro-motor 50, thus ball screw nut 13 movement of advancing.
Thereupon, on axis direction, also advance simultaneously with the housing 30 of ball screw nut 13 combinations.At this moment, the second electro-motor 60 is rotated and extending shaft 21 is rotated, and along with the rotation of extending shaft 21, screw rod 20 is simultaneously rotation also, injects thus operation.
But, not only to be undertaken by rotation by screw rod 20 injecting resins, and the power that need to be able to screw rod 20 be advanced from the back segment of screw rod 20, so that screw rod 20 is with certain pressure extrusion resin.Therefore, in order to be passed to screw rod 20 by the forward travel that described the first electro-motor 50 carries out housing 30, through bearing 31 housing 30 and extending shaft 21 are linked together.
The forward travel of described housing 30 is passed to the extending shaft 21 that is rotating, and screw rod 20 not only has revolving force, also has thrust, thus injecting resin.
At this moment, need to control to form suitable resin to the injection pressure in when injection and press, pressure tester 40 performance and above-mentioned relevant functions.That is, pressure tester 40 is installed in the outside of extending shaft 21, when extending shaft 21 is subject to pressure from housing 30 this pressure is measured.
The pressure of measuring like this is passed to control part (not shown), and when resin was pressed above permissible value, control part was controlled the first electro-motor 50 and reduced the resins pressure, and when resin forced down in reasonable value, control part was controlled the first electro-motor 50 rising resins and pressed.At this moment, regulate the rotary speed of the first electro-motor 50 by increase and decrease, resin is compressed into row control.
Thereby according to existing injection device 100, pressure tester 40 is installed in the outside of the extending shaft 21 that screw rod 20 is connected with housing 30, directly is subjected to the pressure of housing 30 to come pressure is measured.
In the measurement process that makes the resin plasticization, when screw rod retreated, control was used for making the constant back pressure of the pressure maintenance in the section very important.
Particularly, when carrying out expansion injection molding, in the resin metering, need by back pressure the pressure in the section to be risen to more than certain pressure (pressure that can foam), so that the resin that mixes with blowing agent in cylinder section can not foam.At this moment, the pressure in the cylinder section must be in the situation that the pressure that can not depart from objectives significantly remains on constant.
But, in existing injection device 100, pressure and the target back pressure of utilizing pressure tester 40 to read in the section in the constant time cycle compare, when the pressure in the cylinder section during greater than the target back pressure, for the pressure in the cylinder section is adjusted to goal pressure and the position of adjusting screw(rod).In such process, there is following problem, that is, the pressure in the cylinder section can not remain on constant, needs to regulate pressure interimly, but irregular like this pressure is regulated and is made the pressure a section in unbalanced, and the adjusting of irregular like this pressure makes resin expanded in the section.
Summary of the invention
Therefore, the present invention makes in order to solve above-mentioned existing issue, and its purpose is to provide by utilizing oil pressure to control back pressure and makes back pressure continuously and keep constant, thereby can carry out the injection device of good injection operation.
Be used for realizing the injection device that to control back pressure of the present invention of above-mentioned purpose, have: screw rod, force feed and metering resin are injected in cylinder section, rotating motor, be connected with the end of described screw rod, make described screw rod rotation, the advance and retreat motor, transferring power so that described screw rod can advance and retreat, ball screw is connected with electro-motor with described advance and retreat, be rotated with the revolving force of motor by these advance and retreat, ball nut, be configured on the axle of described ball screw, along with the rotation of the described ball screw motion of advancing and retreat, connecting elements, be connected with described ball nut, move back and forth; End at described screw rod is connected with link component, this link component is together motion along with the reciprocating motion of described screw rod, end at described link component is connected with back pressure master cylinder body, and described back pressure master cylinder body is connected with the working oil reservoir vessel through pipe arrangement.
In addition, preferably have injection pressure master cylinder body in the end of screw rod, a side of described injection pressure master cylinder body is combined with described connecting elements, and described injection pressure master cylinder body is connected with the working oil reservoir vessel through pipe arrangement.
In addition, preferably on described pipe arrangement, has respectively switch discharge valve (waste valve).
In addition, the bearing of an end on being combined in described screw rod of preferred described link component is combined, and the other end of described link component is combined with the piston of described back pressure master cylinder body.
In addition, preferred described injection pressure master cylinder body is combined with the end of described screw rod through bearing.
In injection device of the present invention, when the injection operation of carrying out resin, can control the back pressure of generation by cylinder body section, make back pressure continuously and it is remained constant.
Description of drawings
Fig. 1 is the cutaway view of the state that arranges of the existing injection device of expression.
Fig. 2 is the skeleton diagram of the injection device of expression an embodiment of the invention.
The specific embodiment
Below, with reference to accompanying drawing a preferred embodiment of the present invention is described.In addition, although the present invention will be described for the embodiment that illustrates with reference to the accompanying drawings, this embodiment only describes as an embodiment, can not limit technical conceive of the present invention, core texture of the present invention and effect thus.
Fig. 2 is the skeleton diagram of the injection device 200 of expression an embodiment of the invention.
The injection device 200 of present embodiment has: cylinder section 210; Screw rod 220 is injected at cylinder section 210 interior force feeds and metering resin; Rotating motor 230 is connected with the end of screw rod 220, makes screw rod 220 rotations; Advance and retreat are with motor 240, transferring power so that screw rod 220 can advance and retreat; Ball screw 250 is connected with motor 240 with advance and retreat, and the revolving force of being advanced and retreat with motor 240 is rotated; Ball nut 260 is configured on the axle of ball screw 250 movement of advancing and retreat along with the rotation of ball screw 250; Connecting elements 270 is connected with ball nut 260, moves back and forth.
According to present embodiment, be connected with link component 280 at an end of described screw rod 220 through bearing 281, described link component 280 is together motion along with the reciprocating motion of screw rod 220, and an end of link component 280 is connected with back pressure master cylinder body 290.
Described back pressure master cylinder body 290 have cylinder body 291 and with described link component 280 in conjunction with and can with the piston 292 of its interlock.
In addition, the end of described screw rod 220 has the bearing 221 that can make screw rod 220 rotation, has injection pressure master cylinder body 300 in a side of bearing 221.The piston 302 that injection pressure master cylinder body 300 has cylinder body 301 and can move in the inside of cylinder body 301, piston 302 is connected with described connecting elements 270.
In addition, described back pressure master cylinder body 290 is connected with working oil reservoir vessel 310 through pipe arrangement 290a, 290b, and injection pressure master cylinder body 300 is connected with working oil reservoir vessel 310 through pipe arrangement 300a, 300b.Have discharge valve 320 at pipe arrangement 290a, have discharge valve 330 at pipe arrangement 300a.
Described rotating motor 230 constitutes by belt wheel 231,232 and driving-belt 233 transferring power.Described rotating motor 230 can move swimmingly through guide rod (not shown) etc.
In addition, advance and retreat also constitute by belt wheel 241,242 and driving-belt 243 transferring power with motor 240.
Described belt wheel 232 is connected with the end of screw rod 220, and described belt wheel 242 is connected with the end of ball screw 250.
But power transmission is not limited to above-mentioned belt wheel and driving-belt, also can use the power transmission of other structure.
According to such structure, the resin that flows in the cylinder section 210 is melted on one side by force feed on one side and piles up to the leading portion section of cylinder section 210, press to surpass when the melting resin that applies and be set as to resist the back pressure that melting resin presses the time, open discharge valve 320, screw rod 220 retreats in cylinder section 210 under the state of rotation.
At this moment, link component 280 is interlock and moving also, and the piston 292 of the back pressure master cylinder body 290 that is connected with link component 280 is also in cylinder body 291 interior movements.So the fluid in the cylinder body 291 is sent to working oil reservoir vessel 310 from pipe arrangement 290a.
In addition, be combined with bearing 221 and injection pressure master cylinder body 300 in the end of screw rod 220 side, along with the motion of screw rod 220, bearing 221 and injection pressure master cylinder body 300 also retreat movement simultaneously.Cylinder body 301 carries out relative motion with piston 302, and the fluid in the cylinder body 301 is sent to working oil reservoir vessel 310 from pipe arrangement 300a by the discharge valve 330 of opening thus.
Certainly, with belt wheel 231,232 and the rotating motor 230 that is being connected of driving-belt 233 also mobile simultaneously.
At this moment, connecting elements 270, ball screw 250, ball nut 260 and advance and retreat are not moved with motor 240, keep their configuration status.
On the other hand, the injection pressure of effect during for injection, advance and retreat turn round with motor 240, through belt wheel 241,242 and driving-belt 243 with transmission of power to ball screw 250, ball nut 260 carries out traveling priority when ball screw 250 is rotated, and also moves simultaneously with the connecting elements 270 of ball nut 260 combinations.
So, the power that also is pressed with the piston 302 of the injection pressure master cylinder body 300 of described connecting elements 270 combinations, at this moment, the pressure (oil pressure) of cylinder body 301 inside remains constant pressure (target injection pressure) by discharge valve 330, in the scope of target injection pressure, the mobile and cylinder body 301 of piston 302, bearing 221 move, and screw rod 220 carries out action of injection in the 210 interior movements of cylinder section.
At this moment, when the action of injection abnormal (for example, the advance and retreat abnormal operation of motor 240), namely, translational speed after the variation of the caused ball nut 260 of reason ball screw 250 rotations, ball nut 260 is during with the pressure pushing piston 302 more than the target injection pressure, and discharge valve 330 is opened, and piston 302 is in cylinder body 301 interior movements.With send in the working oil reservoir vessel 310 from pipe arrangement 300a at the suitable fluid of cylinder body 301 volumes of the distance of cylinder body 301 interior movements corresponding to piston 302, and from pipe arrangement 300b to piston the cylinder body 301 interior supply fluids of 302 end one side, and the amount of the fluid of supplying with is suitable with cylinder body 301 volumes of the distance that moves corresponding to piston 302.
At this, detect the action of piston 302 or the action of the oil pressure in the cylinder body 301 or detection discharge valve 330, control part (not shown) is controlled with the action of motor 240 advance and retreat thus, thereby regulates injection pressure.
Advance in order to carry out action of injection when mobile at described screw rod 220, link component 280 is also mobile simultaneously, the piston 292 that is being connected with link component 280 also in cylinder body 291 interior movements (in the drawings, mobile to the left from the right side), under the state that discharge valve 320 is opened, fluids in the working oil reservoir vessel 310 are sent in the cylinder body 291 from pipe arrangement 290a, and then fluid is sent into working oil reservoir vessel 310 and stored from pipe arrangement 290b again.
Above, embodiments of the present invention are described based on the illustration accompanying drawing for convenience, but the invention is not restricted to this, can in the scope of technical conceive of the present invention, carry out various distortion and correction.
Claims (4)
1. the injection device that can control back pressure has:
Screw rod (220), force feed and metering resin are injected in cylinder section (210),
Rotating motor (230) is connected with the end of described screw rod (220), makes described screw rod (220) rotation,
Advance and retreat are with motor (240), transferring power so that described screw rod (220) can advance and retreat,
Ball screw (250) is connected with motor (240) with described advance and retreat, be rotated with the revolving force of motor (240) by these advance and retreat,
Ball nut (260) is configured on the axle of described ball screw (250), along with the rotation of described ball screw (250) motion of advancing and retreat,
Connecting elements (270) is connected with described ball nut (260), moves back and forth; It is characterized in that,
End at described screw rod (220) is connected with link component (280), and this link component (280) is together motion along with the reciprocating motion of described screw rod (220), is connected with back pressure master cylinder body (290) at an end of described link component (280),
Described back pressure master cylinder body (290) is connected with working oil reservoir vessel (310) through pipe arrangement (290a, 290b),
Has injection pressure master cylinder body (300) in the end of described screw rod (220), one side of described injection pressure master cylinder body (300) and described connecting elements (270) combination, described injection pressure master cylinder body (300) is connected with working oil reservoir vessel (310) through pipe arrangement (300a, 300b).
2. the injection device that can control back pressure as claimed in claim 1 is characterized in that,
On described pipe arrangement (290a, 300a), has respectively switch discharge valve (320,330).
3. the injection device that can control back pressure as claimed in claim 1 is characterized in that,
One end of described link component (280) and bearing (281) combination that is combined on the described screw rod (220), piston (292) combination of the other end of described link component (280) and described back pressure master cylinder body (290).
4. the injection device that can control back pressure as claimed in claim 1 is characterized in that,
Described injection pressure master cylinder body (300) is combined with the end of described screw rod (220) through bearing (221).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020090031780A KR101040818B1 (en) | 2009-04-13 | 2009-04-13 | Injection Apparatus Possible Back Pressure Control |
| KR10-2009-0031780 | 2009-04-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101856862A CN101856862A (en) | 2010-10-13 |
| CN101856862B true CN101856862B (en) | 2013-10-16 |
Family
ID=42943134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101638964A Expired - Fee Related CN101856862B (en) | 2009-04-13 | 2009-08-14 | Injection apparatus possible back pressure control |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101040818B1 (en) |
| CN (1) | CN101856862B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101283505B1 (en) * | 2011-01-20 | 2013-07-12 | 주식회사 진영이노텍 | Auto sealing apparatus |
| CN106476233B (en) * | 2015-08-28 | 2019-04-12 | 震雄机械（深圳）有限公司 | Jet forming machine and its plasticization unit hydraulic control device, back pressure control method |
| CN110234487B (en) * | 2017-01-31 | 2023-08-11 | 住友重机械工业株式会社 | Injection molding machine |
| KR102502006B1 (en) | 2018-11-23 | 2023-02-22 | 엘에스엠트론 주식회사 | Injection molding machine with back pressure signal filter and control method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306573A (en) * | 2008-05-23 | 2008-11-19 | 浙江大学 | Electric plasticization drive method and apparatus based on direct back-pressing feed back control |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2548006Y2 (en) * | 1991-08-12 | 1997-09-17 | 愛知機械工業株式会社 | Exhaust valve |
| JP2762346B2 (en) | 1994-11-10 | 1998-06-04 | 日精樹脂工業株式会社 | Injection molding method and injection molding machine |
| JP2006088463A (en) | 2004-09-22 | 2006-04-06 | Nissei Plastics Ind Co | Control method of electric/oil pressure type injection device |
| JP4953946B2 (en) | 2007-07-03 | 2012-06-13 | 日精樹脂工業株式会社 | Hydraulic drive method and apparatus for injection molding machine |
-
2009
- 2009-04-13 KR KR1020090031780A patent/KR101040818B1/en not_active IP Right Cessation
- 2009-08-14 CN CN2009101638964A patent/CN101856862B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101306573A (en) * | 2008-05-23 | 2008-11-19 | 浙江大学 | Electric plasticization drive method and apparatus based on direct back-pressing feed back control |
Non-Patent Citations (2)
| Title |
|---|
| JP特开2006-88463A 2006.04.06 |
| JP特开2009-12259A 2009.01.22 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101856862A (en) | 2010-10-13 |
| KR20100113285A (en) | 2010-10-21 |
| KR101040818B1 (en) | 2011-06-14 |
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