KR100741570B1 - Apparatus and method for controlling temperature of mold - Google Patents

Abstract

An apparatus and a method for controlling the temperature of a mold are provided to supply heated water to the mold by heating the water using steam without using a heater. An apparatus for controlling the temperature of a mold includes a heat tank(710), a water supply line(720), a steam supply line(730), a mold water supply line(740), and a mold water discharge line(750). The heat tank stores cooling water. The water supply line is connected to the heat tank so as to supply the cooling water. The steam supply line is connected to the heat tank to supply steam. The mold water supply line is implemented between the heat tank and the mold to supply the cooling water. The mold water discharge line discharges the cooling water from the mold.

Description

Temperature control device and temperature control method of mold {APPARATUS AND METHOD FOR CONTROLLING TEMPERATURE OF MOLD}

1 is a configuration diagram showing an example of a temperature control apparatus of a conventional mold.

2 is a block diagram showing a temperature control apparatus of a mold according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: mold 710: heating tank

711: pressure switch 712: level switch

720: inlet line 721: solenoid valve

722: check valve 730: steam supply line

731: electromagnetic proportional control valve 732: check valve

740: mold introduction line 741: temperature sensor

750: mold discharge line 751: temperature sensor

760: intake line 761: solenoid valve

770: drain line 771: valve

780: steam discharge passage 781: valve

790: Pump

The present invention relates to a temperature control device and a temperature control method of a mold, and more particularly, to improve the quality of the injection product by controlling the temperature of the mold to prevent deformation of the injection molded product and to easily move the injection material in the mold. The present invention relates to a temperature control device and a temperature control method of a mold, which can greatly reduce the volume and installation cost.

In general, the injection mold for synthetic resin is to control the temperature of the mold accurately to improve the quality of the product to be molded, which can be injection molding without controlling the temperature of the mold, but the resin that is the raw material of the injection molding (Resin) changes the viscosity with temperature, so it is necessary to adjust the viscosity at the proper temperature to improve the quality of the injection molding without causing burrs.

In other words, the precise temperature control of the mold has a significant influence on the appearance, electrical properties, shrinkage, or dimensions of the product, so that the mold temperature is appropriately adjusted according to the characteristics of the injection molded product that molds the temperature of the mold during the injection molding operation.

A typical configuration of a temperature control device of such a mold is disclosed in Patent No. 10-0424091 (Application No. 10-2001-0019533) filed and determined by the present applicant, and the configuration thereof is briefly described with reference to FIG. Explain.

As shown, the thermostat constituting the conventional temperature control device, the compressed air line (4) having a compressed air solenoid valve (3) is connected to the refrigerant inlet line (2) having an intake solenoid valve (1) It is connected to an auxiliary tank 6 with a level sensor 5.

In addition, the supply line 7a of the auxiliary tank 6 is connected in parallel with the other supply line 7b of the heater tank 8 to the pump 9, and the outlet line 10 of the pump 9 is provided. The silver 11 is connected to the mold 11, while the return line 12 of the mold 11 is connected to the heater tank 8 to which the drain line 14 having the drain solenoid valve 13 is connected.

In addition, a temperature sensor 15 and a check valve 16 are installed in the return line 12 of the mold 11, and a drain line 18 having a solenoid valve 17 is connected to the heater tank 8. The temperature sensor 15 is arranged in front of the water inlet solenoid valve 1 of the water inlet line 2.

In the operation of the conventional temperature control device, in order to first increase the temperature of the mold 11 and lower the temperature to a predetermined set temperature, the inlet solenoid valve 1 of the refrigerant inlet line 2 is opened to open the inlet solenoid valve 1 through the pump 9. Refrigerant (generally using 'cooling water') is supplied to the mold (11), where the flow of refrigerant is supplementary tank (6)-> supply line (7a)-> pump (9)-> mold (11)-> return line (12). ) Flows into the refrigerant drain line 14 to lower the temperature of the mold 11 to the set temperature.

At this time, the intake solenoid valve 1 and the drain solenoid valve 13 are opened, and the remaining drain solenoid valve 17, the check valve 16, and the compressed air solenoid valve 3 are closed.

Then, in order to supply the hot water of the heater tank 8 to the mold 11 so that the temperature of the mold 11 is lowered and raised to the set temperature, the heater tank 8-> connected supply line 7b-> pump 9 → hot water is supplied through the mold (11) → return line (12) → check valve (16).

At this time, only the check valve 16 is opened, and the remaining inlet solenoid valve 1, the drain solenoid valve 17, the drain solenoid valve 13, and the compressed air solenoid valve 3 are all closed.

In addition, the residual water removal for removing the cold water and hot water in order to prevent freezing during winter or maintenance and inspection of the mold apparatus is performed by using the compressed air line (4) → auxiliary tank (6) → connecting supply line (7b) → heater tank (8). ) → drain line 18; The residual water is discharged along the compressed air line (4) → auxiliary tank (6) → supply line (7a) → pump (9) → mold (11) → return line (12) → drain line (14).

In addition, during the cooling of the winter mold 11, the water inlet solenoid valve 1 and the drain solenoid valve 13 are opened so that the cold water is supplied to the auxiliary tank 6, and the refrigerant is supplied to the suction force of the pump 9. Cold water and hot water are simultaneously sucked and discharged through the supply lines 7a and 7b to cool the mold 11. That is, by simultaneously sucking, mixing, and discharging the cold water and the hot water, it is possible to prevent the temperature of the mold 11 from dropping rapidly even if the coolant temperature in winter is low.

However, this conventional temperature control device has a disadvantage that the volume of the device becomes very large because the auxiliary tank 6 and the heater tank 8 are separated.

In addition, in the related art, since a method of heating water by a heater is adopted, there are disadvantages in that various facilities are increased and expensive installation costs are generated. In addition, when a plurality of the heaters are employed, the cost is inevitably increased.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a temperature control device and a temperature control method of a mold capable of instantaneously heating water in one place using steam.

It is also an object of the present invention to provide a temperature control device and a temperature control method of a mold that can reduce the volume of the device and greatly simplify the configuration.

It is also an object of the present invention to provide a temperature control apparatus and a temperature control method of a mold that can reduce the installation cost and operating cost.

In order to achieve the above object, the temperature control apparatus of the mold according to the present invention,

A heating tank in which water for temperature control is stored;

An inlet line connected to supply temperature control water to the heating tank;

A steam supply line connected to supply steam to the heating tank;

A mold inlet line connected between the heating tank and the mold to supply temperature control water to the mold;

And a mold discharge line connected to discharge the temperature control water from the mold.

Here, it is preferable that a temperature sensor is installed in each of the mold introduction line and the mold discharge line, and an electromagnetic proportional control valve is installed in the steam supply line.

In addition, the heating tank is preferably formed with a steam discharge passage connected to the outside.

At this time, the steam discharge passage is preferably connected between the heating tank and the mold discharge line.

In addition, the heating tank is provided with a pressure switch, it is preferable that the steam discharge passage is opened and closed according to the sensed pressure.

In addition, a drain line is connected between the heating tank and the mold discharge line via a check valve, and the heating tank is preferably provided with a level switch.

In addition, it is preferable that an intake line connected to supply air to the heating tank is additionally installed.

At this time, the intake line is preferably in communication with the inlet line.

In addition, the lower portion of the heating tank is preferably connected to the drain line connected to the outside.

At this time, the drain line is preferably connected between the heating tank and the mold discharge line.

On the other hand, the temperature control method of the mold according to the present invention,

The temperature control water is supplied into the heating tank through the inlet line, and then steam is supplied into the heating tank through the steam supply line to instantaneously heat water in the heating tank, and the water is discharged through the mold. It is done.

Here, it is preferable to detect the temperature of the water introduced into the mold and the temperature of the discharged water, respectively, and vary the amount of steam supplied according to the difference.

Then, it is preferable to release the pressure when the excess pressure is sensed by sensing the pressure in the heating tank.

In addition, it is desirable to detect the water level in the heating tank to discharge in excess and replenish in case of shortage.

In addition, it is preferable to blow air into the heating tank to remove the residual water.

Hereinafter, with reference to the accompanying Figure 2 will be described in detail a preferred embodiment of the present invention.

As shown, the temperature control apparatus of the mold according to an embodiment of the present invention,

A heating tank 710 for storing temperature control water, an inlet line 720 connected to supply temperature control water to the heating tank 710, and a steam supply connected to supply steam to the heating tank 710. A line 730 and a mold inlet line 740 connected between the heating tank 710 and the mold 10 to supply water for temperature control to the mold 10, and water for temperature control from the mold 10. It is configured to include a mold discharge line 750 connected to discharge.

When configured in this way, the water for temperature control is supplied into the heating tank 710 through the inlet line 720, and then steam is supplied through the steam supply line 730 so that the water in the heating tank 710 is instantaneously heated. do. At this time, the temperature of the steam supplied is set to 180 ° C or more.

Then, the water stored and heated in the heating tank 710 is discharged through the mold inlet line 740 is supplied to the mold (10). In this case, a pump 790 is installed in the mold introduction line 740 to support the circulation force of the water.

Then, the water discharged through the mold discharge line 750 of the mold 10 is discharged to the outside.

In addition, the mold inlet line 740 and the mold discharge line 750 are provided with temperature sensors 741 and 751, respectively, and the electronic proportional control valve 731 is provided in the steam supply line 730. . Therefore, the temperature difference between the introduction and discharge of the mold can be sensed and the amount of steam supplied can be adjusted in response to the difference.

In addition, a steam discharge passage 780 is connected between the heating tank 710 and the mold discharge line 750, and a valve 781 is installed in the steam discharge passage 780. Therefore, the valve 781 is opened to discharge steam when the steam pressure in the heating tank 710 exceeds a dangerous value. The valve 781 may be installed with a general safety valve or a solenoid valve. When the solenoid valve is installed, a signal is transmitted according to the steam pressure sensed by the pressure switch 711 installed in the heating tank 710 to open and close the valve.

Instead, the steam tank 710 may be discharged to the outside air in the heating tank 710.

In addition, the heating tank 710 and the mold discharge line 750 are connected to each other via a check valve 755, it is possible to discharge excess water from the heating tank 710. To this end, a level switch 712 is installed in the heating tank 710, and a drain line 756 is connected between the heating tank 710 and the mold discharge line 750 via a check valve 755. have.

On the other hand, it is necessary to remove the residual water in the mold 10 when preventing freezing in winter or replacing and maintaining the mold, and when a series of injection operations are completed.

To this end, an intake line 760 connected to supply air to the heating tank 710 is additionally installed.

In the drawing, the intake line 760 is in communication with the inlet line 720. However, the intake line 760 may be directly connected to the heating tank 710.

In addition, in order to remove water in the heating tank 710 in advance of the residual water treatment, a drain line 770 connected to the outside may be connected to the lower portion thereof. Although water may be removed through the mold discharge line 750, the drain line 770 is used to remove the water faster and more efficiently.

In the drawing, the drain line 770 is connected to the heating tank 710 and the mold discharge line 750. However, the drain line 770 may be directly taken out to the outside.

Reference numerals 752 and 753 which have not been described are solenoid solenoid valves and manual valves installed on the mold discharge line 750, respectively. Of course, the manual valve can be replaced by a general automatic valve on the market.

In addition, solenoid electronic valves 761 and 721 are provided on the intake line 760 and the inlet line 720, respectively.

In addition, check valves 722 and 732 are respectively provided on the water supply line 720 and the steam supply line 730 so that water or steam does not flow back from the heating tank 710.

Hereinafter, the operation of the mold temperature control apparatus according to the present invention will be described based on the above-described configuration.

First, the temperature control water is supplied into the heating tank 710 through the inlet line 720.

Subsequently, steam (180 ° C. or more) is supplied into the heating tank 710 through the steam supply line 730 to instantly heat water in the heating tank 710.

The heated water is supplied to the mold 10 through the mold introduction line 740. The pump 790 is installed on the mold inlet line 740 to allow smoother flow and flow rate adjustment.

Water that has completed heat exchange with the mold 10 is discharged to the outside through the mold discharge line 750. To this end, the solenoid valve 752 and the manual valve 753 provided on the mold discharge line 750 need to be opened in advance.

In addition, the electronic proportional control valve 731 is provided on the steam supply line 730, so that the temperature sensor 741 installed in the mold inlet line 740 and the temperature sensor 751 installed in the mold discharge line 750. The steam supply amount is adjusted according to the detected temperature difference. That is, a method of increasing the steam supply when the temperature difference is remarkable and reducing the steam supply when the temperature difference is small may be adopted.

As a result, it is possible to appropriately control the mold temperature by the supply amount of steam.

In the above-described state, since temperature and water for temperature regulation are simultaneously supplied to the heating tank 710, the steam pressure and the water level in the heating tank 710 may be changed while steam and water are continuously supplied.

If the steam pressure detected by the pressure switch 711 reaches a dangerous value, steam is discharged from the steam discharge passage 780 connected to the upper portion of the heating tank 710. To this end, a valve 781 installed on the steam discharge passage 780 is opened. The steam, as shown, is discharged through the mold discharge line 750, it is of course also possible to be discharged to the outside as it is.

In addition, the water level in the heating tank 710 is sensed by the level switch 712, if the water level is too high, the drain connected between the heating tank 710 and the mold discharge line 750 via the check valve 755 Water is discharged through line 756. In addition, when the water level is too low, through the inlet line 720 to increase the supply of temperature control water.

On the other hand, it is necessary to remove the residual water in the mold in order to prevent freezing of the winter mold or line or to change the mold.

In this case, when the air is supplied through the intake line 760, the inlet line 720 → heating tank 710 → mold introduction line 740 → mold 10 → mold discharge line 750 in the order The residual water is removed.

It is necessary to remove the remaining water in the heating tank 710 through the drain line 770 connected to the heating tank 710 before the residual water removal. In the drawing, water discharged through the drain line 770 is discharged through the mold discharge line 750.

According to the present invention having the configuration as described above, since the temperature control water is instantaneously heated in one place by using steam to supply to the mold, a separate heating means such as a heater is unnecessary.

Accordingly, according to the present invention, there is an advantage that the volume of the device is greatly reduced and the configuration is simple compared with the conventional.

In addition, according to the present invention, it is possible to reduce the installation cost and operating cost as compared to the heater type that the purchase cost is high and the operating cost such as electricity costs are high.

Claims (15)

In the temperature control device of the mold, A heating tank in which water for temperature control is stored; An inlet line connected to supply temperature control water to the heating tank; A steam supply line connected to supply steam to the heating tank; A mold inlet line connected between the heating tank and the mold to supply temperature control water to the mold; And a mold discharge line connected to discharge the water for temperature control from the mold. The method of claim 1, A temperature sensor is installed in the mold introduction line and the mold discharge line, respectively, and an electronic proportional control valve is installed in the steam supply line. The method of claim 2, The temperature control device of the mold, characterized in that the heating tank is formed with a steam discharge passage connected to the outside. The method of claim 3, And the steam discharge passage is connected between the heating tank and the mold discharge line. The method of claim 3, The heating tank is provided with a pressure switch, the temperature control device of the mold, characterized in that the steam discharge passage is opened and closed according to the magnitude of the detected pressure. The method of claim 1, A drain line is connected between the heating tank and the mold discharge line via a check valve, and the heating tank is provided with a level switch. The method according to any one of claims 1 to 6, And an intake line connected to supply air to the heating tank is further installed. The method of claim 7, wherein The intake line is in communication with the inlet line temperature control apparatus of the mold. The method of claim 7, wherein The temperature control device of the mold, characterized in that the drain line is connected to the outside of the lower portion of the heating tank. The method of claim 9, The drain line is a temperature control device of the mold, characterized in that connected between the heating tank and the mold discharge line. Supply temperature control water in the heating tank through the inlet line, and then supply steam in the heating tank through the steam supply line to instantaneously heat the water in the heating tank, and discharges the water through the mold to discharge it Temperature control method of mold. The method of claim 11, The temperature control method of the mold, characterized in that for detecting the temperature of the water introduced into the mold and the temperature of the discharged water, the supply amount of steam in accordance with the difference. The method of claim 12, The temperature control method of the mold, characterized in that for detecting the steam pressure in the heating tank to release the steam in the heating tank when the excess pressure is applied. The method of claim 12, Detecting the water level in the heating tank to discharge water in the heating tank when the water level is exceeded and to replenish water from the outside when the water tank is insufficient. The method according to any one of claims 11 to 14, And blowing air into the heating tank to remove residual water.

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