CN101890791A - Variable-temperature injection mould circulating system - Google Patents
Variable-temperature injection mould circulating system Download PDFInfo
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- CN101890791A CN101890791A CN 201010231441 CN201010231441A CN101890791A CN 101890791 A CN101890791 A CN 101890791A CN 201010231441 CN201010231441 CN 201010231441 CN 201010231441 A CN201010231441 A CN 201010231441A CN 101890791 A CN101890791 A CN 101890791A
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Abstract
The invention relates to a variable-temperature injection mould circulating system which comprises a hot oil system, a cold oil system and an oil return delay system, high-temperature high-thermal conductivity oil is used as a heat transfer medium, and the heating and the cooling of heat using equipment are balanced through a hot oil pump and a cold oil pump with the same flow speed. The oil pumps continuously work, and the flowing process of the oil is changed through a pressure-regulating valve. When a mould is heated, the hot oil is introduced and returns to a hot oil tank; when the mould is cooled, the cold oil is introduced and returns to a cold oil tank to ensure that the hot oil and the cold oil can not be mutually mixed. An oil return delay switching technology is adopted to finish the complete disconnection of cold and hot oil systems, and the energy utilization ratio is improved.
Description
Technical field
The present invention relates to control the circulatory system of mould of plastics temperature, definite saying is exactly to change the circulatory system of mould of plastics temperature as requested according to the different time sections of injection moulding.
Background technology
The injection molding goods are being brought into play crucial effect in national economy every profession and trades such as agricultural, national defense construction, communications and transportation, instrument and meter; but by traditional injection moulding technological forming goods; exist inborn deficiency; the goods of moulding inevitably exist many defectives, common the goods low precision arranged, lack material (die cavity underfill), shrink, surface depression, weld mark obviously, the goods internal stress is big, serious problems such as cracking take place in the demoulding or use.Major part is owing to Shooting Technique itself is brought in the above-mentioned defective, and for example most of high polymer molten viscosity are big, mold filling by force in the low temperature die cavity, and cooling causes the internal stress that can not eliminate rapidly under very high shear stress.Present conventional way is exactly, during mold injection, use die heater, make mould be elevated to uniform temperature, can improve the mobile performance of plastic melt like this, reduce the internal stress of goods, but because will consider the factor of injection cycle, so the temperature of mould can not rise so high, so just restricted the further improvement of fluidity of molten and minimizing goods internal stress.Therefore to obtain high-quality goods, need improve injection molding process.
Summary of the invention
At the deficiency that prior art exists, the purpose of this invention is to provide a kind of additional control circulatory system of mold temperature, can obtain different mold temperatures in the different time sections of injection moulding process.
In order to realize above purpose, technical scheme of the present invention is: variable-temperature injection mould circulating system, comprise hot oil pump, the deep fat storage tank, cold oil pump, the cold oil storage tank, electric heater, flow control valve, hand switch valve and pressure-regulating valve, oil pipe will connect above each control element on request, be connected on forming a real time temperature feedback regulation circulatory system on the hot equipment, it is characterized in that: in the described circulatory system, with high temperature high-termal conductivity oil as heat transfer medium, the hot oil pump of identical flow velocity and cold oil pump, enter with the cold and hot oil circuit in the hot equipment by switching, the different temperatures requirement that realizes injection molding process with the different oily temperature of hot equipment injection mold is injected in control.
The circulatory system comprises: Circulation and Hot Oil Spray system, cold oil circulatory system and oil return delay system.
Described Circulation and Hot Oil Spray system comprises: the deep fat groove, and hot oil pump, electric heater, pressure-regulating valve, flow control valve, magnetic valve 9-1,9-3, hand control valve 10-1 and use hot equipment, high temperature oil is 190～200 ℃, deep fat heats continuously with electric heater.
The described cold oil circulatory system comprises: the cold oil groove, cold oil pump, pressure-regulating valve, flow control valve, magnetic valve 9-2,9-4, hand control valve 10-2 and be 30～80 ℃ with hot equipment, low temperature oil, cold oil is cooled off continuously by the cooling water recirculation system in the cold oil storage tank.
Described oil return delay system comprises: by the timer of the control system of circuit, control magnetic valve 9-3 and 9-4 open or closed it according to time-program(me) of setting, reach certain delay feature.
Described high temperature heat transfer oil is controlled at 190～200 ℃, and Reynolds index (Re) reaches 60000.
The present invention utilizes high temperature high-termal conductivity oil as heat transfer medium, and the hot oil pump of identical flow velocity and cold oil pump use the heating and cooling of hot equipment to reach balance; For making the oil pump continuous operation, rely on pressure-regulating valve to change the flow path of oil.During mold heated, logical deep fat, and deep fat backheat fuel tank; During mold cools down, logical cold oil, cold oil returns the cold oil case, guarantees that deep fat and cold oil can not mix mutually.Adopt oil return delay switching technology, the cold and hot oil of the circulatory system of finding time improves capacity usage ratio.
Description of drawings
Fig. 1 is an oil circulation system schematic of the present invention.
The specific embodiment
Know that by Fig. 1 the present invention is by with hot equipment 1, hot oil pump 2, deep fat storage tank 3, cold oil pump 4, cold oil storage tank 5, electric heater 6, flow control valve 8, magnetic valve 9, hand control valve 10 and pressure-regulating valve 11 are formed, and connect by the high temperature high voltage resistant oil pipe 7 of selecting corresponding specification between each element.The original state of this system is magnetic valve 9-1,9-2 is in closed condition, start hot oil pump 2 and cold oil pump 4, and make the cooling water of electric heater 6 and cooling water pipe be in normal operating conditions, because magnetic valve 9-1,9-2 is in closed condition, when the oil pressure of oil pump reaches the setting pressure 0.2MPa of pressure-regulating valve 11, deep fat and cold oil flow back to deep fat storage tank 3 and cold oil storage tank 5 automatically by pressure-regulating valve 11, make deep fat and cold oil be in the transmission that turbulence state is accelerated heat.
When the oily temperature of deep fat storage tank 3 reaches 200 ℃ of design temperatures, open magnetic valve 9-1 and hand control valve 10-1, deep fat passes through with hot equipment 1 heating mould, when reaching setting (more than the melt temperature of plastics) temperature with hot equipment 1, magnetic valve 9-1 closes, hand control valve 10-1 closes, and notes, and heating mould is to the used time T 1 of design temperature.Open magnetic valve 9-2, hand control valve 10-2 begins logical cold oil cooling die, when reaching setting (plastics eject temperature) temperature with hot equipment 1, magnetic valve 9-2 closes, and hand control valve 10-2 closes, and note, cooling die is to the used time T 2 of design temperature.
After heating cool time of having determined actual mould, begin to set the cooling heating automatic control program of mould.The service time of setting magnetic valve 9-1 is T1, and the service time of setting magnetic valve 9-2 is T2, closes hand control valve 10-1, and 10-2 calculates the time T 3 that exhausts with oil in the hot equipment 1, as foundation time delay.Start-up routine, magnetic valve 9-1 opens, and service time is T1, and magnetic valve 9-4 delayed and closed T3 this moment, made the cold oil of system flow back to the cold oil case.Close the T3 time then when magnetic valve 9-4 delays, magnetic valve 9-3 opens, and guarantees deep fat backheat fuel tank.When logical deep fat time T 1 then after, magnetic valve 9-2 braking is open-minded, and service time be T2, in like manner magnetic valve 9-3 delays and closes T3, guarantees that deep fat returns complete backheat oil groove, so circulation.Make mold temperature in different injection cycles, different variations in temperature is arranged, satisfy injection molding process, produce the high-quality product requirements.
The described high temperature high-termal conductivity oil that utilizes is as heat transfer medium, the heating fluid oil flows in the turnover of mould high speed, and Reynolds index (Re) reaches 60000, promotes heat transfer coefficient, the hot oil pump 2 of identical flow velocity and cold oil pump 4 make it to the heating and cooling balance with hot equipment 1.Deep fat heats continuously with electric heater 6, and cold oil is cooled off continuously by the cooling water recirculation system in the cold oil storage tank 5.Because the mold injection cycle is shorter,,, rely on pressure-regulating valve 11-1,11-2 to change the flow path of oil so adopt the oil pump continuous operation in order to improve the service life of oil pump.High temperature oil is controlled at 190 ℃, and low temperature oil is 30 ℃, and the target temperature of die surface is 150 ℃ of high temperature, 45 ℃ of low temperature.For operating efficiency and the energy savings that improves heating, during mold heated, logical deep fat and deep fat backheat oil supply tank 3; During mold cools down, logical cold oil, cold oil returns cold oil storage tank 5, guarantees that deep fat and cold oil can not mix mutually.Though cold and hot oil can not mix mutually when normal circulation, a small amount of deep fat that still has in the short time that hot and cold oil switches in the mould oil passage enters the cold oil system, otherwise the cold oil in the runner also can enter thermal oil system when switching.The mixing of cold and hot oil when switching in order to reduce as far as possible, adopt oil return delay switching technology, when the deep fat that enters switches to cold oil, oil return line wouldn't switch to the cold oil road, after treating that the interior deep fat of mould oil passage is finished by the fast displacement of cold oil, oil return switches to the cold oil road again, finishes the disconnection fully of cold and hot oil system at last.
Claims (5)
1. variable-temperature injection mould circulating system, comprise with hot equipment (1), hot oil pump (2), deep fat storage tank (3), cold oil pump (4), cold oil storage tank (5), electric heater (6), oil pipe (7), flow control valve (8), magnetic valve (9), hand control valve (10), pressure-regulating valve (11), oil pipe (7) connects above each control element, form a real time temperature feedback regulation circulatory system, it is characterized in that: in the described circulatory system, with high temperature high-termal conductivity oil as heat transfer medium, hot oil pump of identical flow velocity (2) and cold oil pump (4), enter with the cold and hot oil circuit in the hot equipment (1) by switching, control realizes the different temperatures requirement of injection molding process with the different oily temperature of hot equipment (1) injection injection mold.The circulatory system comprises: thermal oil system, thermal oil system and oil return delay system.
2. variable-temperature injection mould circulating system according to claim 1, it is characterized in that: described thermal oil system comprises: hot oil pump (2), electric heater (6), oil pipe (7), flow control valve (8), magnetic valve (9-1), (9-3), hand control valve (10-1), pressure-regulating valve (11), with with hot equipment (1), high temperature oil is 190～200 ℃, and deep fat heats continuously with electric heater (6).
3. variable-temperature injection mould circulating system according to claim 1, it is characterized in that: described cold oil system comprises: cold oil pump (4), oil pipe (7), flow control valve (8), magnetic valve (9-2), (9-4), hand control valve (10-2), pressure-regulating valve (11), with be 30～80 ℃ with hot equipment (1), low temperature oil, cold oil is cooled off continuously by the cooling water recirculation system in the cold oil storage tank (5).
4. variable-temperature injection mould circulating system according to claim 1 is characterized in that: described oil return delay system comprises: magnetic valve (9-3), hand switch valve (9-4) and time controller.
5. variable-temperature injection mould circulating system according to claim 1 is characterized in that: described high temperature heat transfer oil is controlled at 190～200 ℃, and Reynolds index (Re) reaches 60000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010231441 CN101890791A (en) | 2010-07-20 | 2010-07-20 | Variable-temperature injection mould circulating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010231441 CN101890791A (en) | 2010-07-20 | 2010-07-20 | Variable-temperature injection mould circulating system |
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| CN101890791A true CN101890791A (en) | 2010-11-24 |
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| CN 201010231441 Pending CN101890791A (en) | 2010-07-20 | 2010-07-20 | Variable-temperature injection mould circulating system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106079335A (en) * | 2016-08-04 | 2016-11-09 | 江苏文光模具技术有限公司 | The temperature varied cyclical system of a kind of injection mold and temperature varied cyclical method |
| CN106426839A (en) * | 2016-11-09 | 2017-02-22 | 上海普莱克斯自动设备制造有限公司 | Mold pipeline detection device |
| CN106956446A (en) * | 2017-04-20 | 2017-07-18 | 咸宁海威复合材料制品有限公司 | The compression molding device and method of a kind of composite |
| CN107718472A (en) * | 2017-10-23 | 2018-02-23 | 天津蓝科机械有限公司 | One kind can oil extraction oil temperature machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654185A (en) * | 2004-02-12 | 2005-08-17 | 三菱重工业株式会社 | Apparatus and method for mold temperature adjustment, and mold temperature control unit |
-
2010
- 2010-07-20 CN CN 201010231441 patent/CN101890791A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1654185A (en) * | 2004-02-12 | 2005-08-17 | 三菱重工业株式会社 | Apparatus and method for mold temperature adjustment, and mold temperature control unit |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106079335A (en) * | 2016-08-04 | 2016-11-09 | 江苏文光模具技术有限公司 | The temperature varied cyclical system of a kind of injection mold and temperature varied cyclical method |
| CN106426839A (en) * | 2016-11-09 | 2017-02-22 | 上海普莱克斯自动设备制造有限公司 | Mold pipeline detection device |
| CN106426839B (en) * | 2016-11-09 | 2018-08-24 | 上海普莱克斯自动设备制造有限公司 | Mold pipeline detection device |
| CN106956446A (en) * | 2017-04-20 | 2017-07-18 | 咸宁海威复合材料制品有限公司 | The compression molding device and method of a kind of composite |
| CN107718472A (en) * | 2017-10-23 | 2018-02-23 | 天津蓝科机械有限公司 | One kind can oil extraction oil temperature machine |
| CN107718472B (en) * | 2017-10-23 | 2023-06-30 | 天津蓝科机械有限公司 | Oil temperature machine capable of discharging oil |
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Application publication date: 20101124 |