A mold rapid heating and cooling system and method

Abstract

The application provides a mold rapid heating and cooling system and method for switching and conveying medium with different temperatures to mold pipelines to adjust the temperature of the mold, the mold comprising a male mold, a female mold, a male mold pipeline inlet, a male mold pipeline outlet, a female mold pipeline inlet and a female mold pipeline outlet, the mold rapid heating and cooling system comprising: a temperature-raising medium supply module for conveying temperature-raising medium to the mold pipeline, comprising a first conveying pipeline, a second conveying pipeline, a first return pipeline, a second return pipeline, a first valve, a second valve, a third valve and a fourth valve; and a temperature-lowering medium supply module for conveying temperature-lowering medium to the mold pipeline, comprising a third conveying pipeline, a fourth conveying pipeline, a third return pipeline, a fourth return pipeline, a fifth valve, a sixth valve, a seventh valve and an eighth valve. The application can rapidly raise and lower the temperature of the mold, does not need to change the existing mold pipeline, is safer and more convenient to use, and improves the production efficiency.

Description

[Technical Field]

[0001] This invention relates to the field of mold temperature control technology, and in particular to a mold rapid heating and cooling system and method. [Background Technology]

[0002] During the product molding process, molds need to be heated and cooled. Common methods include: 1. Connecting a heat source device to the mold piping, supplying heat to the mold piping to regulate the mold temperature. Common heat sources include hot water and steam. 2. Using electric heating rods and electromagnetic induction to regulate the mold temperature, requiring the installation of corresponding 3D temperature-regulating piping inside the mold. However, these heating methods have the following problems: In the first method, the mold can utilize its existing 3D piping design, allowing for rapid and uniform heating and cooling. However, it is limited by the relationship between temperature and saturated vapor pressure, typically around 7 kg / cm². 2 The temperature under pressure can only reach 164℃; to reach temperatures above 200℃, the pressure would need to reach 16 kg / cm². 2 The above will cause the mold pipeline to bear excessive pressure, which will reduce the mold life and pose safety hazards to the wiring pipeline; in the second method, the use of electric heating rods and electromagnetic induction heating can make the mold temperature reach more than 300℃, but for complex molds, it is not possible to arrange 3D heating pipelines, which can easily cause uneven temperature distribution, and the cooling pipeline is far away from the mold surface, which will result in a slower cooling rate.

[0003] In view of this, the present invention provides a rapid heating and cooling system and method for molds to solve the above problems. [Summary of the Invention]

[0004] The technical problem this invention aims to solve is: When using current methods for rapid temperature regulation of molds, such as supplying hot water or steam into the mold piping, the steam pressure inside the mold reaches 16 kg / cm² when the mold temperature needs to reach above 200°C. 2 The above issues can easily lead to excessive pressure on the mold piping, reducing mold life and posing a high risk to wiring. When using heating rods and electromagnetic induction for heating, corresponding 3D piping needs to be arranged in the mold, but this is difficult to do in complex molds, easily causing uneven temperature distribution, and the cooling pipes being far from the mold surface results in slower cooling rates. This invention provides a rapid heating and cooling system and method for molds to solve the above problems.

[0005] The solution to the technical problem of this invention is: a rapid heating and cooling system for molds, used to switch between delivering media of different temperatures to the mold pipeline to regulate the temperature of the mold. The mold includes a male mold and a female mold, and the male mold and female mold are respectively provided with male mold pipeline and female mold pipeline. The male mold is provided with a male mold pipeline inlet and a male mold pipeline outlet, and the female mold is provided with a female mold pipeline inlet and a female mold pipeline outlet. The rapid heating and cooling system for molds includes:

[0006] A heating medium supply module is used to supply heating medium to the mold pipeline. The heating medium supply module is connected to the inlet of the male mold pipeline and the inlet of the female mold pipeline through a first supply pipeline and a second supply pipeline, respectively, and is connected to the outlet of the male mold pipeline and the outlet of the female mold pipeline through a first return pipeline and a second return pipeline, respectively. A first valve, a second valve, a third valve, and a fourth valve are respectively provided on the first supply pipeline, the second supply pipeline, the first return pipeline, and the second return pipeline.

[0007] A cooling medium supply module is used to supply cooling medium to the mold pipeline. The cooling medium supply module is connected to the inlet of the male mold pipeline and the inlet of the female mold pipeline through a third supply pipeline and a fourth supply pipeline, respectively, and is connected to the outlet of the male mold pipeline and the outlet of the female mold pipeline through a third return pipeline and a fourth return pipeline, respectively. A fifth valve, a sixth valve, a seventh valve, and an eighth valve are respectively provided on the third supply pipeline, the fourth supply pipeline, the third return pipeline, and the fourth return pipeline.

[0008] The heating medium and the cooling medium are hot kerosene and cold kerosene, respectively. The temperature of the hot kerosene is 320-350°C, and the temperature of the cold kerosene is room temperature.

[0009] Preferably, the heating medium supply module is provided with a first internal circulation loop, which is used to circulate and heat the heating medium during the mold cooling process. The first internal circulation loop includes a heating medium storage device, a first delivery pump, a heating device, and a ninth valve connected in sequence according to the flow direction of the heating medium. The first delivery pipeline and the second delivery pipeline are connected to the end of the ninth valve near the heating device through a three-way interface, and the first return pipeline and the second return pipeline are connected to the end of the ninth valve away from the heating device through a three-way interface.

[0010] Preferably, the first internal circulation loop is provided with a first temperature sensor and a first pressure sensor.

[0011] Preferably, the cooling medium supply module is provided with a second internal circulation loop, which is used to circulate and cool the cooling medium during the mold heating process. The second internal circulation loop includes a cooling medium storage device, a second delivery pump, a cooling device, and a tenth valve connected in sequence according to the flow direction of the cooling medium. The third delivery pipeline and the fourth delivery pipeline are connected to the end of the tenth valve near the cooling device through a tee interface, and the third return pipeline and the fourth return pipeline are connected to the end of the tenth valve away from the cooling device through a tee interface.

[0012] Preferably, the second internal circulation loop is provided with a second temperature sensor and a second pressure sensor.

[0013] Preferably, the first and third conveying pipelines are connected to the inlet of the male mold pipeline via a tee connector, and the second and fourth conveying pipelines are connected to the inlet of the female mold pipeline via a tee connector.

[0014] Preferably, the first return pipe and the third return pipe are connected to the outlet of the male mold pipe through a T-junction, and the second return pipe and the fourth return pipe are connected to the outlet of the female mold pipe through a T-junction.

[0015] Preferably, an eleventh valve, a third temperature sensor, and a third pressure sensor are provided at the inlet of the male mold pipe, the inlet of the female mold pipe, the outlet of the male mold pipe, and the outlet of the female mold pipe.

[0016] Preferably, the rapid heating and cooling system for the mold further includes a medium venting module. The medium venting module is used to vent and recover the residual medium in the mold pipeline before disassembling the mold. The medium venting module includes an air compressor, a first discharge pipeline, and a second discharge pipeline. One end of the first discharge pipeline is connected to the output end of the air compressor, and the other end is connected to the inlet of the male mold pipeline and the inlet of the female mold pipeline through a tee connector. One end of the second discharge pipeline is connected to the outlet of the male mold pipeline and the outlet of the female mold pipeline through a tee connector, and the other end is connected to the cooling medium supply module. A twelfth valve and a thirteenth valve are respectively provided between the first venting pipeline and the inlet of the male mold pipeline and the inlet of the female mold pipeline. A fourteenth valve and a fifteenth valve are respectively provided between the second venting pipeline and the outlet of the male mold pipeline and the outlet of the female mold pipeline.

[0017] Preferably, the cooling device includes, but is not limited to, a heat exchanger, and the cooling device cools the medium flowing through it via a normal temperature cooling water delivery pipeline.

[0018] A method for rapid heating and cooling of a mold, comprising:

[0019] S1: Heating the mold: After the mold is closed, open the first valve, the second valve, the third valve, and the fourth valve, and close the fifth valve, the sixth valve, the seventh valve, and the eighth valve. The heating medium is input from the heating medium supply module through the first conveying pipeline and the second conveying pipeline into the male mold pipeline and the female mold pipeline, respectively, and is returned to the heating medium supply module through the first return pipeline and the second return pipeline, respectively. The mold starts to heat up. When the mold heats up to the injection temperature, the injection machine injects plastic.

[0020] S2: Cooling the mold: After the plastic is injected, close the first valve, the second valve, the third valve, and the fourth valve, and open the fifth valve, the sixth valve, the seventh valve, and the eighth valve. The cooling medium is input from the cooling medium supply module through the third and fourth delivery pipelines into the male mold pipeline and the female mold pipeline, respectively, and then returned to the cooling medium supply module through the third and fourth return pipelines. At the same time, the heating medium remaining in the male mold pipeline and the female mold pipeline is driven into the cooling medium supply module. The mold begins to cool down until it reaches the mold opening temperature, and then the mold is opened and the product is taken out.

[0021] Preferably, the system further includes step S3, which is performed before mold disassembly. Step S3 includes: medium evacuation and recovery: after the product is removed, valves 5, 6, 7, and 8 are closed, valves 12, 13, 14, and 15 are opened, and other valves remain in standby mode. The medium evacuation module is started, and the air compressor of the medium evacuation module delivers compressed air to the male mold pipeline and the female mold pipeline through the first discharge pipeline. The residual medium in the male mold pipeline and the female mold pipeline is discharged to the cooling medium supply module for recovery through the second discharge pipeline. After the medium in the mold pipeline is evacuated, the mold is disassembled.

[0022] Preferably, in step S1, the ninth valve is closed and the tenth valve is opened. During this process, the cooling medium does not enter the mold pipeline but continues to cool down to room temperature through the second internal circulation pipeline. In step S2, the tenth valve is closed and the ninth valve is opened. During this process, the heating medium stops entering the mold pipeline and continues to heat up to above 320°C through the first internal circulation pipeline.

[0023] Preferably, the heating medium is hot kerosene at 320-350°C, the injection temperature is 280°C, the cooling medium is cold kerosene at room temperature, the mold opening temperature is room temperature, and the pressure range of the compressed air is 0.5-0.7 MPa.

[0024] The beneficial effects of this invention are that it utilizes hot and cold kerosene to alternately switch the input pipeline to the mold at different heating and cooling stages to rapidly heat and cool the mold, which can achieve rapid adjustment of the mold from room temperature to 280°C, without the need to change the existing mold pipeline, making it safer and more convenient to use and improving production efficiency. [Attached Image Description]

[0025] Figure 1 This is a schematic diagram of the connection between a rapid heating and cooling system for a mold and the mold according to the present invention.

[0026] Figure 2 yes Figure 1 Enlarged diagram of point A in the middle.

[0027] Figure 3 This is a flowchart of the steps of a rapid heating and cooling method for a mold according to the present invention.

Detailed Implementation Methods

[0028] To further illustrate the technical means and effects of the present invention, the following detailed description is provided in conjunction with the embodiments of the present invention and their accompanying drawings.

[0029] This invention provides a rapid heating and cooling system for molds, used to switch between delivering media of different temperatures to the mold piping to regulate the mold temperature. The mold includes a male mold 10 and a female mold 11, with corresponding male mold piping and female mold piping in the male mold 10 and female mold 11. The male mold 10 has a male mold piping inlet 100 and a male mold piping outlet 101 connected to the male mold piping, and the female mold 11 has a female mold piping inlet 110 and a female mold piping outlet 111 connected to the female mold piping. The rapid heating and cooling system for molds includes:

[0030] A heating medium supply module is used to supply heating medium to the mold pipeline to heat the mold. The heating medium supply module is connected to the male mold pipeline inlet 100 and the female mold pipeline inlet 110 through the first supply pipeline 21 and the second supply pipeline 22, respectively, and is connected to the male mold pipeline outlet 101 and the female mold pipeline outlet 111 through the first return pipeline 23 and the second return pipeline 24, respectively. The first supply pipeline 21, the second supply pipeline 22, the first return pipeline 23, and the second return pipeline 24 are respectively equipped with a first valve 31, a second valve 32, a third valve 33, and a fourth valve 34.

[0031] A cooling medium supply module is used to supply cooling medium to the mold pipeline to cool the mold. The cooling medium supply module is connected to the male mold pipeline inlet 100 and the female mold pipeline inlet 110 through the third supply pipeline 25 and the fourth supply pipeline 26, respectively, and is connected to the male mold pipeline outlet 101 and the female mold pipeline outlet 111 through the third return pipeline 27 and the fourth return pipeline 28, respectively. The third supply pipeline 25, the fourth supply pipeline 26, the third return pipeline 27, and the fourth return pipeline 28 are respectively equipped with a fifth valve 35, a sixth valve 36, a seventh valve 37, and an eighth valve 38.

[0032] The heating medium and the cooling medium are hot kerosene and cold kerosene, respectively. The temperature of the hot kerosene is 320-350°C, and the temperature of the cold kerosene is room temperature (around 25°C).

[0033] The heating medium supply module is equipped with a first internal circulation loop 4. When the mold is cooling down, the heating medium is continuously heated to above 320°C through the first internal circulation loop 4, which helps to increase the temperature rise rate of the mold when heating the mold. The first internal circulation loop 4 includes a heating medium storage device 40, a first delivery pump 41, a heating device 42, and a ninth valve 39 connected in sequence according to the flow direction of the heating medium. The first delivery pipeline 21 and the second delivery pipeline 22 are connected to the end of the ninth valve 39 near the heating device 42 through a three-way interface. The first return pipeline 23 and the second return pipeline 24 are connected to the end of the ninth valve 39 away from the heating device 42 through a three-way interface.

[0034] The first internal circulation loop 4 is equipped with a first temperature sensor 51 and a first pressure sensor 52 for detecting the temperature and pressure of the medium flowing through the first internal circulation loop.

[0035] The cooling medium supply module is equipped with a second internal circulation loop 6. When the mold is heated, the cooling medium is continuously cooled down to room temperature through the second internal circulation loop 6, which helps to increase the temperature drop rate of the mold when cooling the mold. The second internal circulation loop 6 includes a cooling medium storage device 60, a second delivery pump 61, a cooling device 62, and a tenth valve 310 connected in sequence according to the flow direction of the cooling medium. The third delivery pipeline 25 and the fourth delivery pipeline 26 are connected to the end of the tenth valve 310 near the cooling device 62 through a three-way interface. The third return pipeline 27 and the fourth return pipeline 28 are connected to the end of the tenth valve 310 away from the cooling device 62 through a three-way interface.

[0036] The heating medium storage device 40 is a hot kerosene storage tank, the cooling medium storage device 60 is a cold kerosene storage tank, and the first delivery pump 41 and the second delivery pump 61 are both oil pumps.

[0037] The second internal circulation loop 6 is equipped with a second temperature sensor 53 and a second pressure sensor 54 for detecting the temperature and pressure of the medium flowing through the second internal circulation loop 6.

[0038] The first conveying pipeline 21 and the third conveying pipeline 25 are connected to the male mold pipeline inlet 100 through a tee interface, and the second conveying pipeline 22 and the fourth conveying pipeline 26 are connected to the female mold pipeline inlet 110 through a tee interface.

[0039] The first return pipe 23 and the third return pipe 27 are connected to the male mold pipe outlet 101 via a T-junction, and the second return pipe 24 and the fourth return pipe 28 are connected to the female mold pipe outlet 111 via a T-junction.

[0040] The male mold pipe inlet 100, male mold pipe outlet 101, female mold pipe inlet 110, and female mold pipe outlet 111 are each equipped with an eleventh valve 311, a third temperature sensor 55, and a third pressure sensor 56. The third temperature sensor 55 and the third pressure sensor 56 are used to detect the temperature and pressure of the medium flowing through the above locations.

[0041] The rapid heating and cooling system for the mold further includes a media venting module. This module vents residual media in the mold pipeline before mold disassembly and returns it to the cooling media storage device 60 for recycling (the media venting module is not used during continuous product production). The media venting module includes an air compressor 70, a first discharge pipeline 71, and a second discharge pipeline 72. One end of the first discharge pipeline 71 is connected to the output end of the air compressor 70, and the other end is connected to the male mold pipeline inlet 100 and the female mold pipeline inlet 110 via a tee connector. One end of the second discharge pipeline 72 is connected to the male mold pipeline outlet 101 and the female mold pipeline outlet 111 via a tee connector. One end is connected to the cooling medium storage device 60 of the cooling medium supply module. The first discharge pipe 71 is provided with a twelfth valve 312 and a thirteenth valve 313 between the male mold pipe inlet 100 and the female mold pipe inlet 110, respectively. The second discharge pipe 72 is provided with a fourteenth valve 314 and a fifteenth valve 315 between the male mold pipe outlet 101 and the female mold pipe outlet 111, respectively. The medium venting module outputs compressed air to the male mold pipe and the female mold pipe through the first discharge pipe 71 via the air compressor 70, and discharges the residual medium in the male mold pipe and the female mold pipe into the cooling medium storage device 60 for recycling via the second discharge pipe 72.

[0042] The cooling device 62 includes, but is not limited to, a heat exchanger. The cooling device 62 cools the medium flowing through it through a cooling water delivery pipeline 63. The cooling water is room temperature cooling water.

[0043] The heating medium storage device 40 is also equipped with a fourth temperature sensor 57 and a pressure relief valve 400. The fourth temperature sensor 57 is used to detect the temperature of the medium in the heating medium storage device 40. The pressure relief valve 400 is connected to the pressure relief pipeline 401. After the pressure relief valve 400 is opened, the pressure in the heating medium storage device 400 can be relieved through the pressure relief pipeline 401 to reduce the pressure in the heating medium storage device 40 and improve safety.

[0044] The cooling medium storage device 60 is further provided with a fifth temperature sensor 58 and a fourth pressure sensor 59. The fifth temperature sensor 58 is used to detect the temperature of the medium in the cooling medium storage device 60, and the fourth pressure sensor 59 is used to detect the pressure in the cooling medium storage device 60.

[0045] All of the valves are one-way valves.

[0046] Based on the embodiments of the present invention, the present invention also provides a method for rapid heating and cooling of a mold, comprising the following steps:

[0047] S1: Heating the mold: After the mold is closed, open the first valve 31, the second valve 32, the third valve 33, and the fourth valve 34, and close the ninth valve 39. The heating medium flows from the heating medium supply module sequentially through the first conveying pipeline 21, the male mold pipeline inlet 100, the male mold pipeline, the male mold pipeline outlet 101, and the first return pipeline 23, and then returns to the heating medium storage device 40 of the heating medium supply module. At the same time, it flows from the heating medium supply module sequentially through the second conveying pipeline 22 and the female mold pipeline. The inlet 110, the female mold pipeline, the female mold pipeline outlet 111, and the second return pipeline 24 return to the heating medium storage device 40 of the heating medium supply module. The male mold 10 and the female mold 11 start to heat up. When the mold is heated to the injection temperature, the injection machine injects plastic. During the above process, the fifth valve 35, the sixth valve 36, the seventh valve 37, and the eighth valve 38 are closed, and the tenth valve 310 is opened. That is, the cooling medium does not enter the mold pipeline but continues to cool down to room temperature through the second internal circulation pipeline 6.

[0048] S2: Cooling the mold: After plastic injection, close the first valve 31, the second valve 32, the third valve 33, and the fourth valve 34, and open the ninth valve 39. The heating medium stops entering the mold pipeline and continues to heat up to above 320°C through the first internal circulation pipeline 4. Open the fifth valve 35, the sixth valve 36, the seventh valve 37, and the eighth valve 38, and close the tenth valve 310. The cooling medium flows from the cooling medium supply module sequentially through the third conveying pipeline 25, the male mold pipeline inlet 100, the male mold pipeline, the male mold pipeline outlet 101, and the third return pipeline 27 before returning to the cooling medium supply module. Simultaneously, the residual heating medium in the male mold pipeline is driven into the cooling medium storage device 60 of the cooling medium supply module. The cooling medium flows from the cooling medium supply module sequentially through the fourth conveying pipeline 26, the female mold pipeline inlet 110, the female mold pipeline, the female mold pipeline outlet 111, and the fourth return pipeline 28 before returning to the cooling medium storage device 60 of the cooling medium supply module. At the same time, the residual heating medium in the female mold pipeline is driven into the cooling medium storage device 60 of the cooling medium supply module. The mold begins to cool down until it reaches the mold opening temperature, at which point the mold is opened and the product is removed.

[0049] Before disassembling the mold, step S3 is performed. Step S3 is used to drain the residual medium in the mold pipeline and return it to the cooling medium storage device 60 for recycling (this step is not performed during continuous product production). Step S3 includes: media draining and recycling: After the product is removed, the fifth valve 35, the sixth valve 36, the seventh valve 37, and the eighth valve 38 are closed, and the twelfth valve 312, the thirteenth valve 313, the fourteenth valve 314, and the fifteenth valve 315 are opened. Other valves remain in standby mode. The air compressor 70 of the media draining module is started. The air compressor 70 delivers compressed air to the male mold pipeline and the female mold pipeline through the first discharge pipeline 71. The residual medium in the mold pipeline is discharged to the cooling medium storage device 60 for recycling through the second discharge pipeline 72. The mold is then disassembled after the residual medium in the mold pipeline has been completely drained.

[0050] The heating medium is hot kerosene at 320-350°C, the injection temperature is 280°C, the cooling medium is cold kerosene at room temperature, the mold opening temperature is room temperature, and the pressure range of the compressed air is 0.5-0.7 MPa.

[0051] The beneficial effects of this invention are that it utilizes hot and cold kerosene to alternately switch the input pipeline to the mold at different heating and cooling stages to rapidly heat and cool the mold, which can achieve rapid adjustment of the mold from room temperature to 280°C, without the need to change the existing mold pipeline, making it safer and more convenient to use and improving production efficiency.

[0052] It should be noted that the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A rapid heating and cooling system for molds, used to switch between supplying media of different temperatures to the mold piping to regulate the temperature of the mold, wherein the mold includes a male mold and a female mold, the male mold and female mold are respectively provided with male mold piping and female mold piping, the male mold is provided with a male mold piping inlet and a male mold piping outlet, and the female mold is provided with a female mold piping inlet and a female mold piping outlet, characterized in that, The rapid heating and cooling system for the mold includes: A heating medium supply module is used to supply heating medium to the mold pipeline. The heating medium supply module is connected to the inlet of the male mold pipeline and the inlet of the female mold pipeline through a first supply pipeline and a second supply pipeline, respectively, and is connected to the outlet of the male mold pipeline and the outlet of the female mold pipeline through a first return pipeline and a second return pipeline, respectively. A first valve, a second valve, a third valve, and a fourth valve are respectively provided on the first supply pipeline, the second supply pipeline, the first return pipeline, and the second return pipeline. A cooling medium supply module is used to supply cooling medium to the mold pipeline. The cooling medium supply module is connected to the inlet of the male mold pipeline and the inlet of the female mold pipeline through a third supply pipeline and a fourth supply pipeline, respectively, and is connected to the outlet of the male mold pipeline and the outlet of the female mold pipeline through a third return pipeline and a fourth return pipeline, respectively. A fifth valve, a sixth valve, a seventh valve, and an eighth valve are respectively provided on the third supply pipeline, the fourth supply pipeline, the third return pipeline, and the fourth return pipeline. The heating medium and the cooling medium are hot kerosene and cold kerosene, respectively. The temperature of the hot kerosene is 320-350°C, and the temperature of the cold kerosene is room temperature.

2. The mold rapid heating and cooling system as described in claim 1, characterized in that: The heating medium supply module is provided with a first internal circulation loop, which is used to circulate and heat the heating medium during the mold cooling process. The first internal circulation loop includes a heating medium storage device, a first delivery pump, a heating device, and a ninth valve connected in sequence according to the flow direction of the heating medium. The first delivery pipeline and the second delivery pipeline are connected to the end of the ninth valve near the heating device through a three-way interface. The first return pipeline and the second return pipeline are connected to the end of the ninth valve away from the heating device through a three-way interface.

3. The mold rapid heating and cooling system as described in claim 2, characterized in that: The first internal circulation loop is equipped with a first temperature sensor and a first pressure sensor.

4. The rapid heating and cooling system for molds as described in claim 1, characterized in that: The cooling medium supply module is provided with a second internal circulation loop, which is used to circulate and cool the cooling medium during the mold heating process. The second internal circulation loop includes a cooling medium storage device, a second delivery pump, a cooling device, and a tenth valve connected in sequence according to the flow direction of the cooling medium. The third delivery pipeline and the fourth delivery pipeline are connected to the end of the tenth valve near the cooling device through a three-way interface. The third return pipeline and the fourth return pipeline are connected to the end of the tenth valve away from the cooling device through a three-way interface.

5. The rapid heating and cooling system for a mold as described in claim 4, characterized in that: The second internal circulation loop is equipped with a second temperature sensor and a second pressure sensor.

6. The rapid heating and cooling system for molds as described in claim 1, characterized in that: The first and third conveying pipelines are connected to the inlet of the male mold pipeline via a T-junction, and the second and fourth conveying pipelines are connected to the inlet of the female mold pipeline via a T-junction.

7. The rapid heating and cooling system for a mold as described in claim 1, characterized in that: The first return pipe and the third return pipe are connected to the outlet of the male mold pipe through a T-junction, and the second return pipe and the fourth return pipe are connected to the outlet of the female mold pipe through a T-junction.

8. The rapid heating and cooling system for a mold as described in claim 1, characterized in that: The male mold pipe inlet, female mold pipe inlet, male mold pipe outlet, and female mold pipe outlet are all equipped with an eleventh valve, a third temperature sensor, and a third pressure sensor.

9. The rapid heating and cooling system for a mold as described in claim 1, characterized in that: It also includes a media venting module, which is used to vent and recover the residual media in the mold pipeline before disassembling the mold. The media venting module includes an air compressor, a first discharge pipeline, and a second discharge pipeline. One end of the first discharge pipeline is connected to the output end of the air compressor, and the other end is connected to the inlet of the male mold pipeline and the inlet of the female mold pipeline through a tee connector. One end of the second discharge pipeline is connected to the outlet of the male mold pipeline and the outlet of the female mold pipeline through a tee connector, and the other end is connected to the cooling media supply module. A twelfth valve and a thirteenth valve are respectively provided between the first discharge pipeline and the inlet of the male mold pipeline and the inlet of the female mold pipeline. A fourteenth valve and a fifteenth valve are respectively provided between the second discharge pipeline and the outlet of the male mold pipeline and the outlet of the female mold pipeline.

10. A rapid heating and cooling system for a mold as described in claim 4, characterized in that: The cooling device is a heat exchanger, and the cooling device cools the medium flowing through it through a normal temperature cooling water pipeline.

11. A method for rapid heating and cooling of a mold, characterized in that, Includes the following steps: S1: Heating the mold: After the mold is closed, open the first valve, the second valve, the third valve, and the fourth valve, and close the fifth valve, the sixth valve, the seventh valve, and the eighth valve. The heating medium is input from the heating medium supply module through the first conveying pipeline and the second conveying pipeline into the male mold pipeline and the female mold pipeline, respectively, and is returned to the heating medium supply module through the first return pipeline and the second return pipeline, respectively. The mold starts to heat up. When the mold heats up to the injection temperature, the injection machine injects plastic. S2: Cooling the mold: After the plastic is injected, close the first valve, the second valve, the third valve, and the fourth valve, and open the fifth valve, the sixth valve, the seventh valve, and the eighth valve. The cooling medium is input from the cooling medium supply module through the third and fourth delivery pipelines into the male mold pipeline and the female mold pipeline, respectively, and then returned to the cooling medium supply module through the third and fourth return pipelines. At the same time, the heating medium remaining in the male mold pipeline and the female mold pipeline is driven into the cooling medium supply module. The mold begins to cool down until it reaches the mold opening temperature, and then the mold is opened and the product is taken out.

12. The method for rapid heating and cooling of a mold as described in claim 11, characterized in that: It also includes S3, which is performed before disassembling the mold. S3 includes: medium evacuation and recovery: after the product is removed, the fifth, sixth, seventh, and eighth valves are closed, and the twelfth, thirteenth, fourteenth, and fifteenth valves are opened. Other valves remain in standby mode. The medium evacuation module is started. The air compressor of the medium evacuation module delivers compressed air to the male mold pipeline and the female mold pipeline through the first discharge pipeline. The residual medium in the male mold pipeline and the female mold pipeline is discharged to the cooling medium supply module for recovery through the second discharge pipeline. The mold is disassembled after the medium in the mold pipeline is completely evacuated.

13. The method for rapid heating and cooling of a mold as described in claim 11, characterized in that: In step S1, the ninth valve is closed and the tenth valve is opened. During this process, the cooling medium does not enter the mold pipeline but continues to cool down to room temperature through the second internal circulation pipeline. In step S2, the tenth valve is closed and the ninth valve is opened. During this process, the heating medium stops entering the mold pipeline and continues to heat up to above 320°C through the first internal circulation pipeline.

14. The method for rapid heating and cooling of a mold as described in claim 11, characterized in that: The heating medium is hot kerosene at 320-350°C, the injection temperature is 280°C, the cooling medium is cold kerosene at room temperature, the mold opening temperature is room temperature, and the pressure range of the compressed air is 0.5-0.7 MPa.

Images