JP3093921U - Mold heating and cooling system - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To provide a mold heating / cooling system capable of shortening a mold heating time. A heating and cooling system for a mold according to the present invention includes:
A medium having two different temperatures for heating and cooling is placed in a mold 10.
0, the medium path is switched to the medium path, the mold 100 is heated,
In the heating and cooling system of the mold 100 in which the molding step and the cooling step are repeated, in the heating step, a valve for sending a heating medium to a medium path in the mold 100 and a circulation path of the cooling medium that does not pass through the mold 100. To the mold 100 of the cooling medium from the cooling unit 30 in the cooling step.
From the mold 100 to a valve 75 having a venturi mechanism provided in the circulation path of the cooling medium during the heating step, which is provided with a switching valve unit 50 for performing switching to circulate the cooling medium 100 through the cooling unit 100. The heating medium is poured in, and the heating medium is discharged using the suction function of the venturi mechanism of the valve.

Description

[Detailed description of the device] [Technical field to which the device belongs]

  The present invention also relates to a heating and cooling system for a mold for molding plastic products and the like. Of.

[Prior art]

  Conventionally, in the molds for molding plastic products, etc. Then, the mold is heated by supplying two different temperature media for heating and cooling. , Molding, cooling the mold, and taking out the molded product.

[Problems to be solved by the device]

  However, in the past, during the heating process, the heating medium was drained through the mold. When returning to the system, if the pressure of the drainage system is high, the pressure of the heating medium must be raised. In addition, it is not possible to smoothly discharge and move the heating medium, and the mold heating time There was a problem that was extended.   Therefore, in the present invention, especially during the heating process, the medium is smoothly discharged and moved, and the temperature of the mold is raised. The object is to provide a mold heating / cooling system capable of shortening the time. It is something.

[Means for Solving the Problems]

  In order to solve the above-mentioned problems, a heating and cooling system for a mold according to the invention as defined in claim 1. Depending on the heating / cooling process, the system uses two different temperature media for heating and cooling. Switch to the medium path in the mold and send it, and repeat the mold heating process, molding process, and cooling process In a mold heating / cooling system, a heating medium is added to the medium path in the mold during the heating process. While sending the body, the cooling medium circulates in the circulation path that does not pass through the mold, A valve with a Venturi mechanism provided in the body's circulation circulates the heat flowing out of the mold. The medium for pouring is poured, and the sucking action of the Venturi mechanism is used to It is characterized in that the medium is ejected.   A heating / cooling system for a mold according to a second aspect of the present invention responds to a heating / cooling process. Then, two kinds of media with different temperatures for heating and cooling are switched to the media path in the mold and sent. , A mold heating / cooling system that repeats the mold heating process, molding process, and cooling process. In the heating step, the valve is switched and the cooling medium is sent to the medium path in the mold for cooling. The cooling medium is switched to a circulation path that does not pass through the mold, and the cooling unit is used in the cooling process. The cooling medium from the printer is circulated to the cooling unit through the mold. A bench equipped with a replacement valve unit and provided in the circulation path of the cooling medium during the heating process. The heating medium flowing out of the mold is poured into a valve having a Urie mechanism, The medium for heating is discharged by utilizing the suction action of the venturi mechanism of the valve. It is characterized by doing so.   According to the present invention, during the heating process, the heating medium is sent to the medium path in the mold. , The cooling medium circulates through the circulation path that does not pass through the mold, and is provided for the cooling medium circulation path. The heating medium flowing out of the mold is poured into the valve with the venturi mechanism. Only, the medium for heating is discharged by using the sucking action of the Venturi mechanism. Therefore, it is possible to smoothly discharge the heating medium to the circulation path. It is possible to shorten the heating time of the mold to a predetermined temperature during the heating process. If steam is used as the heating medium and water is used as the cooling medium, the valve To reduce vibration and noise when pouring the heating medium flowing out of the mold into the I can do it.

[Embodiment of device]

  Hereinafter, embodiments of the present invention will be described in detail.   FIG. 1 shows a heating / cooling system for a mold 100 according to an embodiment of the present invention. , This heating / cooling system consists of a heating unit 1, a cooling unit 30, and a switching valve. It has a subunit 50.   In the heating unit 1, the raw water is softened by the water softener 21 and further fed by the chemical injection device 22. After injecting medicines such as preservatives, it is supplied to the boiler 20 and converted into steam in the boiler 20. The discharge valve 23 is configured to supply the switching valve unit 50.   The cooling unit 30 cools the cooling water supplied to the cooling water supply port with a cooling power. (Or chiller) 31 and heat is exchanged in this cooling tower 31. The cooling water (water temperature 10 ° C to room temperature) is switched by the pump 32 through the cooling water discharge port. The valve unit 50 is supplied. In addition, the switching valve unit Cooling water returning from the cooling tower 31 through the cooling water return port. Water is sprinkled from the upper part of the inside to heat exchange.   The switching valve unit 50 has four switches that are all opened and closed by air control. It is equipped with flap valves 71, 72, 73, 74.   That is, the switching valve unit 50 cools the cooling unit 30. The cooling water from the water discharge port is made to flow into the pump 76 from the cooling water receiving port, and the pump 76 The pressure is increased and supplied to the mold 100 through the switching valve 71 and the manifold 61. It is supposed to be paid.   Further, the cooling water circulating through the mold 100 is further switched through the manifold 62. It is led to the cooling water drainage port through the valve 72 and to the cooling water return port of the cooling unit 30. Inflow and switching between the discharge side of the pump 76 and the outlet side of the switching valve 72 The valve 73 and the valve (silent reducer) 75 having a venturi mechanism are connected. , Configured to allow steam from the outlet side of the manifold 62 to flow into the valve 75 is doing.   The air (pressure air) for opening / closing control of the four switching valves 71 to 74 is not shown. Supply from a different air source through the air filter 56 and the air regulator 57 It is like this.   Further, from an air source (not shown), an air filter 56, an air regulator 57, the cock 58, the stop valve 59, and the outlet side of the switching valves 71 and 74. It is possible to supply air (pressure air) to the pipeline.   The temperature of the mold 100 is detected by the temperature sensor 101 and is not shown in the figure. Sent to the control panel.   FIG. 2 shows that the four switching valves 71 to 74 are in standby, heating, and cooling. It is explanatory drawing of an open / close state.   Next, the operation of the heating and cooling system according to the present embodiment will be described with reference to FIG. Reveal (During standby)   In the standby mode, as shown in FIG. 2, only the switching valve 73 is open. The other three switching valves 71, 72, 74 are controlled to be closed.   At this time, the cooling water from the cooling unit 30 is supplied to the pump 76 and the switching valve 7. 3. The circulation state is returned to the cooling unit 30 via the valve 75. Also, for heating Steam from the unit 1 is not supplied to the mold 100 because the switching valve 74 is closed. I can't. (When cooling the mold 100)   When the mold 100 is injection-molded, the mold 100 is kept at a predetermined temperature (usually a high temperature). The temperature sensor 101, and based on the detection signal from the temperature sensor 101, a predetermined timing 2, the switching valves 73, 74 are closed and the switching valve 71 is closed. , 72 is controlled to an open state to rapidly cool the mold 100 with cooling water.   That is, the switching valves 73 and 74 are closed and the switching valves 71 and 72 are opened. By doing so, the cooling water is supplied to the pump 32, the pump 76, the switching valve 71, the manifold. Shield 61, mold 100, manifold 62, switching valve 72, cooling tower 31, the cooling water is circulated to the pump 32 and the mold 100 is rapidly cooled. Be done.   After cooling the mold 100 and opening it to take out the molded product, Moving to the heating operation described above, the temperature of the mold 100 is raised by flowing high-temperature steam. Repeat a series of actions. (When heating the mold 100)   In this case, as shown in FIG. 2, the switching valve 74 is controlled to the open state. The switching valves 71 and 72 are controlled to the closed state. In addition, the switching valve 73 is controlled to the open state. To do. At this time, the cooling water from the cooling unit 30 is switched to the pump 76. Circulation state of returning to the cooling unit 30 via the valve 73 and the valve 75, that is, the mold 10 A state in which a circulation path that does not pass through 0 is formed.   In addition, the steam produced by the heating unit 1 is transferred to the switching valve 74 and the manifold. After passing through the mold 61 and passing through the mold 100, the mold 100 is heated to a predetermined temperature. Through the field 62 and the valve 75 having the venturi mechanism into the circulation path of the cooling water. To do.   The steam that has flowed into the valve 75 is sucked up by the Venturi mechanism so that the steam is circulated. Is smoothly discharged to. That is, the flow velocity of the cooling water increases at the nozzle portion of the valve 75. As a result, the atmospheric pressure of the vapor suction portion is reduced, and the vapor is sucked into the valve 75 and is circulated to the circulation path. The discharge is done smoothly. As a result, the steam can be smoothly discharged to the circulation path. And shortening the time for raising the temperature of the mold 100 to a predetermined temperature during the heating process. You can   When steam is used as the heating medium and water is used as the cooling medium, the valve 7 5, to reduce vibration and noise when pouring steam flowing out of the mold 100 You can also   The timing and time for switching the switching valves 71 to 74 are set as described above. , Use a timer or control panel according to the user's wishes and conditions. It is possible to freely perform the setting operation on the tool.

[Effect of device]

  According to the present invention, the medium for heating can be smoothly discharged to the circulation path. It is possible to shorten the heating time of the mold to the predetermined temperature during the heating process. If steam is used as the heating medium and water is used as the cooling medium, the valve should be It is also possible to reduce vibration and noise when pouring out the heating medium that flows out. A mold heating / cooling system can be provided.

[Brief description of drawings]

FIG. 1 is a piping system diagram showing a mold heating / cooling system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an open / closed state of the switching valve of the present embodiment.

[Explanation of symbols]

1 heating unit 20 boilers 21 Water softener 23 Discharge valve 30 cooling unit 31 cooling tower 32 pumps 50 switching valve unit 56 air filter 57 Air regulator 58 cook 59 Stop valve 61 manifold 62 manifold 71-74 switching valve 75 valves 76 pumps 100 mold 101 temperature sensor

Claims (2)

[Scope of utility model registration request] 1. A metal mold which repeats a heating process, a molding process, and a cooling process of a mold by switching and sending two kinds of media having different temperatures for heating and cooling to a medium path in the mold according to a heating and cooling process. In the mold heating / cooling system, during the heating process of the mold, the medium for heating is sent to the medium path in the mold, and the medium for cooling circulates in the circulation path that does not pass through the mold, and the medium for cooling is The heating medium flowing out of the mold is poured into a valve having a Venturi mechanism provided in the circulation path, and the suction medium of the Venturi mechanism is used to discharge the heating medium. And the mold heating and cooling system. 2. A metal mold which repeats a heating process, a molding process, and a cooling process of a mold by switching and sending two kinds of media having different temperatures for heating and cooling to a medium path in the mold according to a heating and cooling process. In the mold heating / cooling system, in the heating process, the valve that sends the heating medium to the medium passage in the mold is switched and the cooling medium is switched to the circulation route that does not pass through the mold, and the cooling is performed in the cooling process. A valve having a switching valve unit for switching the cooling medium from the cooling unit through the mold to the cooling unit and having a venturi mechanism provided in the circulation path of the cooling medium during the heating process of the mold. The heating medium flowing out of the mold is poured into, and the heating medium is discharged by utilizing the suction action of the venturi mechanism of the valve. system.