CN102806646A - Hydraulic circuit system for microcellular foaming injection - Google Patents
Hydraulic circuit system for microcellular foaming injection Download PDFInfo
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- CN102806646A CN102806646A CN 201110151225 CN201110151225A CN102806646A CN 102806646 A CN102806646 A CN 102806646A CN 201110151225 CN201110151225 CN 201110151225 CN 201110151225 A CN201110151225 A CN 201110151225A CN 102806646 A CN102806646 A CN 102806646A
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Abstract
The invention relates to a hydraulic circuit system for microcellular foaming injection, which comprises an injection loose withdraw valve connected with an oil inlet end and an injection oil cylinder of the system, a glue melting valve connected with the oil inlet end and a glue melting motor of the system, a glue melting back pressure valve and a numerical control back pressure valve connected with the glue melting valve, and a cut-off valve capable of cutting off an oil path between the injection oily cylinder and the glue melting valve. The system comprises a hydraulic control oil cylinder and a nozzle hydraulic control valve which are capable of controlling the opening of a nozzle. The injection loose withdraw valve and the nozzle hydraulic control valve are three-position four-way valves, the glue melting valve is a two-position four-way valve, and the cut-off valve is a cartridge valve. The system not only guarantees precise backpressure required by microcellular foaming injection, but also prevents advanced foaming of raw materials caused by leakage of a directional slide valve and retreat of a screw, and meets the technical process of microcellular foaming that the weight of the prepared piece is reduced, the forming period is shortened, the clamping force of equipment is reduced, the internal stress and warping are small, the straightness is high, shrinkage is not available, and the size is stable. And the hydraulic circuit system for microcellular foaming injection is simple and effective in structure, low in cost and strong in practicality.
Description
Affiliated technical field
The present invention relates to a kind of hydraulic circuit system, especially a kind of microporous foam injection hydraulic circuit system.
Background technology
The eighties in 20th century, Massachusetts Institute Technology (MIT) at first proposes the notion of microporous foam, hopes in goods, to produce highdensity closed-cell, thereby when reducing material usage, improves its rigidity, and avoid influence that performances such as intensity are caused.U.S. TREXEL company sets up and obtains all licenses of MIT in the nineties in last century, with the microporous foam technology commercialization and continue to greatly develop, and obtained approval widely in the industry.Because high to equipment requirements, particularly hydraulic control circuit is very complicated to relate to the control system, requires high back pressure, servo valve control etc., it is with high costs to ressemble and debug existing equipment, and marketing face is narrow.Little frothing injection more is present in theory stage in China, does not also have prototype design successfully to reach popularization at present.
Summary of the invention
Technical problem to be solved by this invention: overcome the above-mentioned deficiency of prior art and provide a kind of cost low, little foaming injection hydraulic circuit system simple in structure, practical.
The technical scheme that the present invention solves its technical problem employing is: a kind of microporous foam injection hydraulic circuit system comprises that the injection pine moves back valve, melten gel valve, nozzle pilot operated valve device; The numerical control counterbalance valve, control counterbalance valve, and stop valve, melten gel motor; Stop valve, by pilot valve, oil cylinder, compressed air source unit; Air-inflating valve, material pipe group, control nozzle switching device, the hydraulic control oil cylinder is formed by connecting through pipeline; It is characterized in that: the oil inlet end of system links to each other with the oil-in that the injection pine moves back valve through pipeline, and the system oil return end links to each other with oil return opening, realizes that pine moves back and action of injection; First actuator port of melten gel valve links to each other with stop valve, and oil return opening links to each other with the counterbalance valve oil-in, realizes the smelting glue back pressure function; Second actuator port of melten gel valve links to each other with melten gel motor oil-in, realizes the melten gel action; The pilot stage of numerical control counterbalance valve control counterbalance valve realizes numerical control back pressure function; Between first actuator port of melten gel valve and the oil cylinder rodless cavity stop valve being arranged, is the pilot-actuated valve of stop valve by pilot valve, and screw rod can not retreated because of the leakage of direction valve when assurance microporous foam high pressure was inflated; Nozzle pilot operated valve device and hydraulic control oil cylinder control nozzle switching device are realized the screw front end closing function, guarantee the sealing property after microporous foam is inflated.
It is three-position four-way valve that described injection pine moves back valve, and the melten gel valve is a two-position four-way valve, and stop valve is the logic inserted valve, is two-position four-way valve zero leakage valve by pilot valve.
Described is two-position four-way valve zero leakage valve by pilot valve, and its oil return is independent oil return, does not merge with system oil return.
Described control nozzle switching device is the pin type hydraulic control nozzle that dams.
Described control nozzle switching device is pin type spring nozzle or the pin type pneumatic control nozzle that dams that dams, and at this moment nozzle pilot operated valve device and hydraulic control oil cylinder can be cancelled, as alternative.
Beneficial effect of the present invention:
1. a microporous foam injection hydraulic circuit system is realized the mobile high of microporous foam injection mo(u)lding, and moulded products is in light weight, no shrinkage cavity, and pit and distortion, dimensionally stable, molding cycle is short, saves advantages such as energy consumption;
2. a microporous foam injection hydraulic circuit system is simple in structure effective, practical, practices thrift cost, helps promoting and using.
Description of drawings
Fig. 1 is a kind of overall structure schematic diagram of microporous foam injection hydraulic circuit system.
Be labeled as among the figure: 1. the injection pine moves back valve; 2. melten gel valve; 3. nozzle pilot operated valve device; 4. numerical control counterbalance valve; 5. counterbalance valve; 6. melten gel motor; 7. stop valve; 8. by pilot valve; 9. oil cylinder; 10. compressed air source unit; 11. air-inflating valve; 12. material pipe group; 13. high-speed switch nozzle device; 14. hydraulic control oil cylinder.
The specific embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
As shown in the figure; A kind of microporous foam injection hydraulic circuit system; Comprise that the injection pine that links to each other with the system oil inlet end moves back valve (1), the A1 mouth that the injection pine moves back valve links to each other with the rodless cavity of oil cylinder (9), and the B1 mouth links to each other with the A2 mouth of melten gel valve (2) and the A7 mouth of stop valve (7); The T1 mouth that the injection pine moves back valve links to each other with the system oil return end, realizes that pine moves back and action of injection; The B2 mouth of melten gel valve (2) links to each other with melten gel motor (6) oil-in, realizes the melten gel action; The A2 mouth of melten gel valve (2) links to each other with the A7 mouth of stop valve (7), and the T2 mouth links to each other with counterbalance valve (5) oil-in, realizes the smelting glue back pressure function; The pilot stage of numerical control counterbalance valve (4) control counterbalance valve (5) realizes numerical control back pressure function; Between the A2 mouth of melten gel valve (2) and oil cylinder (9) rodless cavity stop valve (7) being arranged, is the pilot-actuated valve of stop valve (7) by pilot valve (8), and screw rod can not retreated because of the leakage of direction valve when assurance microporous foam high pressure was inflated; Nozzle pilot operated valve device (3) and hydraulic control oil cylinder (14) control nozzle switching device (13) realize the screw front end closing function, guarantee the sealing property that microporous foam is inflated.
It is three-position four-way valve that described injection pine moves back valve (1), and melten gel valve (2) is a two-position four-way valve, is two-position four-way valve zero leakage valve by pilot valve (8).
During the melten gel action, system's oil inlet end pressure flow input, YA5 gets electric, and the P2 mouth of melten gel valve (2) leads to the B1 mouth, and the oily oil inlet end through melten gel valve (2) arrival melten gel motor (6) of system pressure drives melten gel motor (6) and rotates realization melten gel function; YA5 gets the electric while; The A2 mouth of melten gel valve (2) leads to the T2 mouth; The A7 and the B8 of stop valve (7) are in open mode, and at this moment the oil of oil cylinder (9) rod chamber arrives melten gel valve (2) through stop valve (7), is circulated to counterbalance valve (5) again; Numerical control counterbalance valve (4) changes counterbalance valve (5) and the guide controls oil through regulating, and realizes accurate back pressure control.Simultaneously; Air-inflating valve (11) is opened; Compressed air source unit (10) is got to supercritical fluid such as nitrogen or carbon dioxide in the material pipe group (12); Accuracy requirement to back pressure in the time of melten gel is very high, and the material that back pressure difference will have influence in the screw rod mixes with the even of injecting gas, and the limited raw material of avoiding foams in screw rod in advance.
After the melten gel release, air-inflating valve (11) is closed; YA6 gets electric, and by the logical T8 mouth of pilot valve (8) A8 mouth, the zero leakage of P8 mouth is shut, and at this moment stop valve (7) is closed fully, oil cylinder (9) transfixion under theoretical state; While YA7 gets electric, and nozzle pilot operated valve device (3) P3 mouth leads to the B3 mouth, and the A3 mouth leads to the T3 mouth, and hydraulic control oil cylinder (14) control nozzle switching device (13) cuts out, and waits for next injection cycle.
After injection moulding machine mould open, goods eject the action completion, mould assembling action; Be action of injection then, the YA2 that the injection pine moves back valve (1) gets electric, simultaneously by the YA6 of pilot valve (8) meta that cuts off the power supply back; The YA8 outage, nozzle pilot operated valve device (3) P3 mouth leads to the A3 mouth, and the B3 mouth leads to the T3 mouth; Hydraulic control oil cylinder (14) control nozzle switching device (13) is opened; At this moment mixed raw material under the molten condition of supercritical fluid as the pop bottle dixie cup that waved, through high-speed switch nozzle device (13), be expelled in the die cavity at a high speed.Through such processing technology, make the closed porosity of from ten to tens microns of the densely covered sizes in goods intermediate layer.The microporous foam injection molding technology has been broken through many limitations of traditional injection moulding, on the basis that basic assurance product properties does not reduce, can obviously alleviate product weight and shorten molding cycle; Reduce the clamp force of equipment greatly; And having internal stress and warpage is little, glacing flatness is high, does not shrink; Dimensionally stable, advantage such as the moulding form is big.
Operation principle
This invents a kind of microporous foam injection hydraulic circuit system; Comprise that the injection pine that links to each other with the system oil inlet end moves back valve (1); The A1 mouth that the injection pine moves back valve links to each other with the rodless cavity of oil cylinder (9); The B1 mouth links to each other with the A2 mouth of melten gel valve (2) and the A7 mouth of stop valve (7), and the T1 mouth that the injection pine moves back valve links to each other with the system oil return end, realizes that pine moves back and action of injection; The B2 mouth of melten gel valve (2) links to each other with melten gel motor (6) oil-in, realizes the melten gel action; The A2 mouth of melten gel valve (2) links to each other with the A7 mouth of stop valve (7), and the T2 mouth links to each other with counterbalance valve (5) oil-in, realizes the smelting glue back pressure function; The pilot stage of numerical control counterbalance valve (4) control counterbalance valve (5) realizes numerical control back pressure function; Between the A2 mouth of melten gel valve (2) and oil cylinder (9) rodless cavity stop valve (7) being arranged, is the pilot-actuated valve of stop valve (7) by pilot valve (8), and screw rod can not retreated because of the leakage of direction valve when assurance microporous foam high pressure was inflated; Nozzle pilot operated valve device (3) and hydraulic control oil cylinder (14) control nozzle switching device (13) realize the screw front end closing function, guarantee the sealing property that microporous foam is inflated.Through such processing technology, make the closed porosity of from ten to tens microns of the densely covered sizes in goods intermediate layer.The microporous foam injection molding technology has been broken through many limitations of traditional injection moulding, on the basis that basic assurance product properties does not reduce, can obviously alleviate product weight and shorten molding cycle; Reduce the clamp force of equipment greatly; And having internal stress and warpage is little, glacing flatness is high, does not shrink; Dimensionally stable, advantage such as the moulding form is big.
Claims (5)
1. a microporous foam injection hydraulic circuit system comprises that the injection pine moves back valve (1), melten gel valve (2), nozzle pilot operated valve device (3); Numerical control counterbalance valve (4), control counterbalance valve (5), and stop valve (7), melten gel motor (6); Stop valve (7), by pilot valve (8), oil cylinder (9), compressed air source unit (10); Air-inflating valve (11), material pipe group (12), control nozzle switching device (13), hydraulic control oil cylinder (14) reaches and is formed by connecting through pipeline; It is characterized in that: the oil inlet end of system links to each other with the oil-in that the injection pine moves back valve (1) through pipeline, and the system oil return end links to each other with oil return opening, realizes that pine moves back and action of injection; First actuator port of melten gel valve (2) links to each other with stop valve (7), and oil return opening links to each other with counterbalance valve (5) oil-in, realizes the smelting glue back pressure function; Second actuator port of melten gel valve (2) links to each other with melten gel motor (6) oil-in, realizes the melten gel action; The pilot stage of numerical control counterbalance valve (4) control counterbalance valve (5) realizes numerical control back pressure function; Between first actuator port of melten gel valve (2) and oil cylinder (9) rodless cavity stop valve (7) being arranged, is the pilot-actuated valve of stop valve (7) by pilot valve (8), and screw rod can not retreated because of the leakage of direction valve when assurance microporous foam high pressure was inflated; Nozzle pilot operated valve device (3) and hydraulic control oil cylinder (14) control nozzle switching device (13) realize the screw front end closing function, guarantee the sealing property after microporous foam is inflated.
2. a kind of microporous foam injection hydraulic circuit system as claimed in claim 1; It is characterized in that: it is three-position four-way valve that described injection pine moves back valve (1); Melten gel valve (2) is a two-position four-way valve, and stop valve (7) is the logic inserted valve, is two-position four-way valve zero leakage valve by pilot valve (8).
3. a kind of microporous foam injection hydraulic circuit system as claimed in claim 1, it is characterized in that: described is two-position four-way valve zero leakage valve by pilot valve (8), and its oil return is independent oil return, does not merge with system oil return.
4. a kind of microporous foam injection hydraulic circuit system as claimed in claim 1 is characterized in that: described control nozzle switching device (13) is the pin type hydraulic control nozzle that dams.
5. a kind of microporous foam injection hydraulic circuit system as claimed in claim 1; It is characterized in that: described control nozzle switching device (13) is pin type spring nozzle or the pin type pneumatic control nozzle that dams that dams; At this moment nozzle pilot operated valve device (3) can be cancelled with hydraulic control oil cylinder (14), as alternative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110151225 CN102806646A (en) | 2011-06-03 | 2011-06-03 | Hydraulic circuit system for microcellular foaming injection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110151225 CN102806646A (en) | 2011-06-03 | 2011-06-03 | Hydraulic circuit system for microcellular foaming injection |
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| CN102806646A true CN102806646A (en) | 2012-12-05 |
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| CN 201110151225 Pending CN102806646A (en) | 2011-06-03 | 2011-06-03 | Hydraulic circuit system for microcellular foaming injection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111559060A (en) * | 2020-05-20 | 2020-08-21 | 宁波华美达机械制造有限公司 | Zero back pressure injection oil piping system |
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2011
- 2011-06-03 CN CN 201110151225 patent/CN102806646A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111559060A (en) * | 2020-05-20 | 2020-08-21 | 宁波华美达机械制造有限公司 | Zero back pressure injection oil piping system |
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Application publication date: 20121205 |