KR102281821B1 - Injection molding apparatus of built-in type capable of pressure regulation and temperature control - Google Patents

Abstract

An integrated injection molding device comprises: a pair of molds configured to form an injection cavity; a pressure regulating unit configured to supply pressurized air to the injection cavity to regulate the pressure of the injection cavity; a heating unit configured to create a hot water circulation through at least one of the molds to heat the injection cavity; a cooling unit configured to create a cold water circulation through at least one of the molds to cool the injection cavity; and a controller for controlling the operation of the pressure regulating unit, the heating unit, and the cooling unit. The heating unit is configured to discharge the hot water from the hot water circulation when the temperature of the hot water passing through the mold is below a preset hot water temperature. The cooling unit is configured to discharge the cold water from the cold water circulation when the temperature of the cold water passing through the mold is equal to or higher than a preset cold water temperature. Accordingly, it is possible to heat and cool the injection cavity stably.

Description

Injection molding apparatus of built-in type capable of pressure regulation and temperature control

The present invention relates to an integrated injection molding apparatus capable of adjusting the pressure of an injection cavity before injection molding and capable of controlling the temperature for rapid cooling and heating.

In order to exclude injection defects and improve injection quality, equipment for pressure control and temperature control are used in injection molding machines. For example, a pressurizer and a vacuum machine for increasing and decreasing the pressure in the injection cavity before injection molding, a hot water supply unit and a cold water supply unit for increasing and decreasing the temperature of the injection cavity before and during injection molding are used. Since these peripheral installations operate independently of the injection molding machine rather than organically, there is a problem in solving the injection defect and complicating the environment around the injection molding machine. In addition, there is a need to improve the supply and discharge of hot and cold water and thus stable heating and cooling functions.

Laid-open Patent Publication No. 10-2009-0072901 (published date: 2009.07.02) Laid-Open Patent Publication No. 10-2008-0043589 (published date: May 19, 2008) Japanese Patent Application Laid-Open No. 2017-177694 (published on October 5, 2017)

An object of the present invention is to provide an injection molding apparatus in which auxiliary equipment for pressure regulation and temperature control of the injection molding machine can operate organically with the injection molding machine. Another object of the present invention is to provide an integrated injection molding apparatus that enables stable heating and cooling of a mold cavity by supply and discharge of hot water and supply and discharge of cold water.

An integrated injection molding apparatus according to an embodiment of the present invention includes a pair of molds configured to form an injection cavity, and a pressure control unit configured to supply pressurized air to the injection cavity to control the pressure of the injection cavity. a heating unit configured to create a hydrothermal circulation through one or more of the molds to heat the injection cavity, a heating unit configured to create a cold water circulation through one or more of the molds to cool the injection cavity a cooling unit, and a controller for controlling the operation of the pressure regulating unit, the heating unit, and the cooling unit. The heating unit is configured to discharge the hot water from the hot water circulation when the temperature of the hot water that has passed through the mold is below a preset hot water temperature, and the cooling unit sets the temperature of the cold water that has passed through the mold to a preset cold water temperature. If it is above, the cold water is configured to be discharged from the cold water circulation.

The integrated injection molding apparatus may further include a cooling tower for storing cooling water. The heating unit may be configured to discharge hot water below the preset hot water temperature to the cooling tower, and the cooling unit may be configured to discharge cold water above the preset cold water temperature to the cooling tower.

The controller includes heating according to the hot water circulation by the heating unit, hot water purging by the circulation of cold water by the cooling unit, cooling according to the cold water circulation by the cooling unit, and supplying pressurized air by the pressure regulating unit. It can be controlled so that the cold water purging is sequentially performed to form one cycle.

The pair of molds, the pressure regulating unit, the heating unit, the cooling unit, and the controller may be configured to form an integral body.

According to the present invention, it is configured to heat and cool the injection cavity by circulation of hot water and circulation of cold water. In particular, if the temperature of the hot water that has passed through the mold is lower than the preset hot water temperature, the hot water is discharged and the cold water that has passed through the mold If the temperature of the cold water is higher than the preset cold water temperature, by discharging the cold water, it is possible to prevent the temperature of the hot water from becoming too low or the temperature of the cold water from becoming too high, thereby stably heating and cooling the injection cavity. In addition, by integrally configuring the pressure regulating unit, the heating unit, and the cooling unit in the injection apparatus, integrated control is possible in the controller of the integrated injection molding apparatus, so that stable control can be achieved through a simple structure of control.

1 is a schematic block diagram of an integrated injection molding apparatus according to an embodiment of the present invention.
2 is a view for explaining a pressure control action including pressurization and vacuum formation of the integrated injection molding apparatus according to an embodiment of the present invention.
3 is a view for explaining an injection cavity heating process by hot water of the integrated injection molding apparatus according to an embodiment of the present invention.
4 is a view for explaining a cooling process of the injection cavity by the cold water of the integrated injection molding apparatus according to the embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 , an integrated injection molding apparatus according to an embodiment of the present invention includes equipment for pressurizing and vacuum forming an injection cavity, equipment for supplying and discharging hot water to an injection cavity, and supplying and discharging cold water to and discharging an injection cavity. equipment may be included. In addition, the integrated injection molding apparatus may be provided with general equipment for performing injection molding, for example, a pair of molds 11 and 12 , and a servo motor 13 for driving one or more of the molds 11 and 12 . , 14), a resin feeder 15 for supplying the injection resin, servo motors 16 and 17 for measuring and transferring the resin, a controller 19, and the like. The controller 19 may be a PLC controller, configured to receive signals from sensors described below, and may be programmed to control the operation of various valves and operating elements to perform each process for injection molding. . Since each component itself for such injection is common in an injection molding apparatus, a detailed description thereof will be omitted.

1 and 2 , a pressure regulating unit 20 for regulating the pressure in the injection cavity may be provided. Specifically, a pressurized air supply 21 configured to supply pressurized air for pressurization of the injection cavity may be provided, and further, an air exhaust 23 configured to discharge air in the injection cavity to lower the pressure. can be provided. For example, the pressurized air supply 21 and the air exhaust 23 may be composed of an air compressor (air compressor) or an air pump (air pump). The pressurized air generated by the pressurized air supply 21 is connected to one or more of the molds 11 and 12 through the air inlet passage 22 to the injection cavity ratio formed by the combination of the two molds 11 and 12. may be supplied, and the air in the injection cavity may be discharged to the outside through the air discharge passage 24 by the operation of the air discharger 23 .

1 and 3 , a heating unit 30 for circulating heated water through the molds 11 and 12 for heating the injection cavity is provided. The heating unit 30 may include a hot water tank 31 , a hot water pump 32 , and a heater 33 .

The hot water pump 32 pumps hot water supplied from the hot water tank 31, and the hot water pumped by the hot water pump 32 is heated while passing through the heater 33 and then supplied to the molds 11 and 12. The hot water passing through the heater 33 may be supplied to the molds 11 and 12 through the hot water valves 34 and 35 through the hot water supply passage 36 . The hot water supplied to the molds 11 and 12 can heat the injection cavity formed by the combination of the molds 11 and 12 while passing through the molds 11 and 12 . The hot water passing through the molds 11 and 12 is returned to the hot water tank 31 through the hot water discharge passage 37 .

Hot water temperature sensors 38 and 41 may be installed in the hot water discharge passage 37 . When the temperature of the hot water sensed by the hot water temperature sensors 38 and 41 is below a preset temperature, for example, 80 ° C., the hot water return valves 39 and 42 are closed and the hot water discharge valves 40 and 43 are opened to open the hot water. is sent to the cooling tower 100 . On the other hand, when the temperature of the hot water sensed by the hot water temperature sensors 38 and 41 is higher than the preset temperature, the hot water return valves 39 and 42 are opened and the hot water discharge valves 40 and 43 are closed so that the hot water can be heated normally. It may be returned to the tank 31 .

The make-up water pump 45 receives the cooling water from the cold water tank 46 and supplies it to the heater 33 . The cooling water pumped by the make-up water pump 45 exchanges heat with the hot water discharged from the hot water tank 31 in the make-up water heat exchanger 47 through the make-up water passage 49, and then passes through the heater 33. After that, it may be configured to be supplied to the hot water tank 31 . The hot water discharged from the hot water tank 31 may be returned to the hot water tank 31 after passing through the make-up water heat exchanger 47 through the hot water circulation passage 48 .

When the temperature of the hot water stored in the hot water tank 31 is lowered, the hot water may be discharged to the cold water tank 46 . When the temperature of the hot water in the hot water tank 31 is lower than a preset temperature, for example, 80 ° C., the hot water in the hot water tank 31 passes through the low temperature water discharge valve 50 through the low temperature water discharge passage 51 . It may be configured to drain into the cold water tank 46 .

When the high-pressure gas is accumulated in the hot water tank 31 , the high-pressure gas may be discharged. The high-pressure gas collected in the upper part of the hot water tank 31 passes through the high-pressure gas discharge valve 53 through the high-pressure gas discharge passage 52 connecting the hot water tank 31 and the cold water tank 46 to the cold water tank 46 ) can be released.

On the other hand, when the temperature of the hot water stored in the hot water tank 31 is too high, a hot water cooling heat exchanger 55 for cooling the hot water may be provided. The hot water in the hot water tank 31 passes through the hot water cooling heat exchanger 55 and the hot water pump 32 through the hot water circulation passage 56, and is supplied from the cooling tower 100 while passing through the hot water cooling heat exchanger 55. It is cooled through heat exchange with cooling water. The cooling water of the cooling tower 100 passes through the hot water cooling heat exchanger 55 through the cooling water circulation line 101 .

After the hot water circulates through the molds 11 and 12 for a predetermined time by the hot water pump 32 , the hot water circulation may be stopped, and the hot water remaining in the molds 11 and 12 may be discharged. For example, hot water may be recovered to the hot water tank 31 by pushing hot water by supply of cold water by the cooling unit 60 to be described later. At this time, when the water level of the hot water tank 31 reaches a set upper level using a water level sensor provided in the hot water tank 31 , it is determined that all of the hot water has been recovered and the supply of cold water may be stopped.

1 and 4 , a cooling unit 60 for circulating heated water through the molds 11 and 12 for cooling the injection cavity is provided. The cooling unit 60 includes a cold water tank 46 , and a cold water pump 61 .

The cold water pump 61 pumps the cold water supplied from the cold water tank 46 and supplies it to the molds 11 and 12 . The cold water pumped by the cold water pump 61 may be supplied to the molds 11 and 12 through the cold water supply valves 63 and 64 through the cold water supply passage 62 . The cold water passing through the molds 11 and 12 may be returned to the cold water tank 46 via the cold water return valves 66 and 67 through the cold water discharge passage 65 .

Meanwhile, cold water temperature sensors 68 and 69 may be installed in the cold water discharge passage 65 . When the cold water temperature sensed by the cold water temperature sensors 68 and 69 is equal to or higher than a preset temperature, for example, 80° C., the cold water return valves 66 and 67 are closed and the cold water discharge valves 70 and 71 are opened to open the cold water is discharged to the cooling tower 100 . On the other hand, when the cold water temperature sensed by the cold water temperature sensors 68 and 69 is lower than the preset temperature, the cold water return valves 66 and 67 are opened and the cold water discharge valves 70 and 71 are closed so that the cold water is normally cold water. return to the tank (46). At this time, the cold water may be configured to flow into the cold water tank 46 after being cooled by heat exchange with a chiller while passing through the cold water heat exchanger 72 . A chiller tank 73 for storing the chiller may also be provided, and a chiller circulation passage 74 for allowing the chiller of the chiller tank 73 to pass through the cold water heat exchanger 72 and the chiller heat exchanger 75. may be provided. The chiller heat exchanger 75 may be configured to exchange heat between the chiller and the cooling water stored in the cooling tower 100 .

After allowing cold water to circulate through the molds 11 and 12 by the cold water pump 61 for a certain period of time, the cold water circulation is stopped, and the pressurized air supply 21 is operated to remain in the molds 11 and 12 by pressurized air. cold water can be discharged.

As described above, the heating of the injection cavity according to the hot water circulation, the hot water purging by the supply of cold water, the cooling of the injection cavity according to the cold water circulation, and the cold water purging by the supply of the pressurized air are performed in one cycle. It may be performed sequentially to achieve this.

Although the embodiment of the present invention has been described above, the scope of the present invention is not limited thereto, and it is easily changed by a person skilled in the art from the embodiment of the present invention and recognized as equivalent. including all changes and modifications to the scope of

11, 12: mold
13, 14, 16, 17: servo motor
16: resin feeder
19: controller
20: pressure regulating unit
21: pressurized air supply
22: air inlet passage
23: air exhaust
24: air exhaust passage
30: heating unit
31: hot water tank
32: hot water pump
33: heater
38, 41: temperature sensor
39, 42: hydrothermal return valve
40, 43: hot water discharge valve
45: make-up water pump
47: heat exchanger
46: cold water tank
60: cooling unit
61: cold water pump
66, 67: cold water return valve
70, 71: cold water drain valve
73: chiller tank
72: cold water heat exchanger
75: chiller heat exchanger
100: cooling tower

Claims (4)

a pair of molds configured to form an injection cavity;
a pressure regulating unit configured to supply pressurized air to the injection cavity so as to adjust the pressure of the injection cavity;
a heating unit configured to create a hydrothermal circulation through at least one of the molds to heat the injection cavity;
a cooling unit configured to create a circulation of cold water through at least one of the molds to cool the injection cavity; and
a controller for controlling the operation of the pressure regulating unit, the heating unit, and the cooling unit
includes,
The heating unit is configured to discharge the hot water from the hot water circulation when the temperature of the hot water passing through the mold is below a preset hot water temperature,
The cooling unit is configured to discharge the cold water from the cold water circulation when the temperature of the cold water that has passed through the mold is equal to or higher than a preset cold water temperature,
The controller is configured to perform heating according to the hot water circulation by the heating unit, hot water purging by the circulation of cold water by the cooling unit, cooling according to the cold water circulation by the cooling unit, and the supply of pressurized air by the pressure regulating unit. Controlling the cold water purging to be performed sequentially to form one cycle,
The pair of molds, the pressure regulating unit, the heating unit, the cooling unit, and the controller are configured to form an integral body
All-in-one injection molding device. In claim 1,
Further comprising a cooling tower for storing the cooling water,
The heating unit is configured to discharge hot water below the preset hot water temperature to the cooling tower,
The cooling unit is configured to discharge cold water above the preset cold water temperature to the cooling tower
All-in-one injection molding device. delete delete

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