JP6740049B2 - Mold cooling device - Google Patents

Description

The present invention relates to a mold cooling device for cooling a mold by supplying cooling water to a cooling pipe arranged inside the mold in die casting, resin molding or the like.

As a conventional mold cooling device of this type, for example, one shown in Patent Document 1 is known.
The mold cooling device shown in Patent Document 1 includes a pressure-feeding unit that pressure-feeds cooling water and air, a fluid joining unit that joins a cooling water supply pipe and an air supply pipe connected to the pressure feeding unit, and a cooling water manifold. The mold cooling unit connected to the mold cooling water passage is connected in order. The pumping section is arranged near the casting machine (molding machine), and the fluid merging section is arranged near the cooling water manifold arranged near the mold of the casting machine (molding machine).

Here, in the pumping unit of the mold cooling device, a plurality of cooling water supply pipes are branched in parallel from the discharge side pipe of the water supply pump that discharges the cooling water, and the cooling water electromagnetic pipe is provided for each cooling water supply pipe. It incorporates a valve. Further, in the pressure feeding section, a plurality of air supply pipes are branched from the air pipe, and an air solenoid valve is incorporated for each air supply pipe.
Then, one cooling water supply pipe, one air supply pipe, a fluid confluence part, an outward path side of the cooling water manifold connected to the fluid confluence part by a water intake port, and each outward path side port of the cooling water manifold Connected to each hose, each reciprocating cooling pipe in the mold cooling part connected to each hose, the hose connected from each return pipe return port to each return port side of the cooling water manifold, and the cooling water manifold The return path side and a drain hose connected to the drain port of the cooling water manifold form a set of cooling systems. Then, each cooling system is controlled by an operation control circuit arranged in the pumping section.

In this mold cooling device, when the operation control circuit receives the cooling start signal from the casting machine (molding machine), the operation control circuit starts operating, and the water supply pump operates according to a command from the operation control circuit to cool. Water discharge is started. At the same time, the electromagnetic valve for cooling water is also opened to start pressure-feeding the cooling water. Then, the cooling water discharged from the water supply pump reaches the cooling water manifold from the cooling water supply pipe through the fluid confluence part, and the hoses and the reciprocating cooling pipes in the mold from the respective outlet ports of the cooling water manifold. The cooling water passage of the mold is passed through the outward path of the heat exchanger, and heat is exchanged there. Then, the cooling water is discharged from the return path of the reciprocating cooling pipe, the hose, the return path side opening of the cooling water manifold, and the drain hose of the cooling water manifold.

Then, after a preset time has elapsed, the operation control circuit closes the cooling water solenoid valve, and then the operation control circuit opens the air solenoid valve to start the air pressure delivery. The air that has been pressure-fed from the pressure-feeding portion passes through the fluid confluence portion from the air supply pipe and reaches each outward-side port of the cooling water manifold. Then, the air enters the cooling water passage of the mold from each of the outward passage side ports through the hose and the outward passage of the reciprocating cooling pipe in the mold. Then, the air purges (displaces) the cooling water remaining in the cooling water passage, and the purged cooling water is discharged from the return passage of the reciprocating cooling pipe and the return passage side opening of the cooling water manifold.

Japanese Patent No. 3186027

However, in the conventional mold cooling device described in Patent Document 1, the following problems may occur.
That is, there is a possibility that the cooling water may leak from the damaged or dropped portion due to damage or loss of the cooling water supply pipe, air supply pipe, hose, or the like in each cooling system, or damage to the mold. In this case, a stable mold cooling effect cannot be obtained, which may affect the quality of the cast/molded product. In particular, the water leak in the mold has a great influence on the quality of the product because the leaked water becomes steam and remains as a nest in the product.
Therefore, the present invention has been made to solve the conventional problems, and an object thereof is to provide a mold cooling device capable of detecting water leakage in a cooling system.

In order to solve the above-mentioned problems, a mold cooling device according to an aspect of the present invention is connected to a water source, is connected to a cooling water inlet side pipe in which a cooling water electromagnetic valve is incorporated, and is connected to an air source. An air inlet side pipe incorporating a solenoid valve, a cooling pipe inlet side pipe connected to a fluid merging part for joining the cooling water inlet side pipe and the air inlet side pipe, and installed in a mold, A reciprocating cooling pipe connected to the cooling pipe inlet side pipe on the outward path side, and a cooling system having a cooling pipe return pipe connected to the return path side of the reciprocating type cooling pipe are provided to the cooling pipe return pipe. While incorporating a return pipe solenoid valve, in the cooling pipe inlet side pipe, or the inlet side of the return pipe solenoid valve of the cooling pipe return pipe, in the cooling pipe inlet side pipe or in the cooling pipe return pipe A pressure detector that detects the pressure of the fluid is connected, and an operation control unit that controls opening and closing of the cooling water solenoid valve, the air solenoid valve, and the return pipe solenoid valve, and the cooling water by the operation control unit A solenoid valve for the air, the solenoid valve for the air and the solenoid valve for the return pipe, and a determination unit for determining the presence or absence of water leakage in the cooling system based on the pressure value of the fluid detected by the pressure detector. The point is to have.

According to this mold cooling device, the determination unit is based on the opening/closing operation of the cooling water solenoid valve, the air solenoid valve, and the return pipe solenoid valve by the operation control unit, and the pressure value of the fluid detected by the pressure detector. Since the presence/absence of water leakage in the cooling system is determined, the mold cooling device can detect water leakage in the cooling system.
Further, in this mold cooling device, the operation control unit opens the cooling water solenoid valve, then closes the cooling water solenoid valve, opens the air solenoid valve, and opens the air solenoid valve. After that, the return pipe solenoid valve is controlled to be closed after a predetermined time has passed, and the air return solenoid valve is controlled to be closed after a predetermined time has passed after the return pipe solenoid valve is closed. It is preferable to control so that the return pipe solenoid valve is opened after a lapse of a predetermined time from closing the use solenoid valve.

Further, in this mold cooling device, the determination unit compares the pressure value of air detected immediately after the return pipe solenoid valve is detected by the pressure detector with a normal air pressure set value, When the value is lower than the normal air pressure set value, it is preferable to judge that there is a large amount of water leakage abnormality and to judge that there is water leakage.
According to this mold cooling device, a large amount of water leakage in the cooling system can be detected. As a result, for example, the cooling water inlet side pipe, the air inlet side pipe or the cooling pipe inlet side pipe is pulled out, a large hole is opened in the pipe, the cooling pipe is broken, and water or air is returned to the cooling pipe return pipe. It is possible to detect a large amount of water leakage in the case where it does not come up.

Also, in this mold cooling device, the determination unit compares the pressure value of the cooling water detected by the pressure detector immediately after the cooling water solenoid valve is opened with a normal water pressure set value, and When the pressure value is lower than the normal water pressure set value, it may be determined that there is a large amount of water leakage abnormality and it may be determined that there is water leakage.
This mold cooling device can also detect a large amount of water leakage in the cooling system.

Further, in this mold cooling device, the determination unit is configured to detect a pressure value of air detected by the pressure detector immediately after the return pipe solenoid valve is closed and a predetermined value after closing the air solenoid valve. After a lapse of time, calculate the pressure difference from the pressure value of the air just before opening the return piping solenoid valve, and if the calculated pressure difference is larger than the minute leak abnormality set value, there is a minute water leakage abnormality. It is preferable to judge that there is water leakage.

According to this mold cooling device, a minute water leak in the cooling system can be detected. Although this does not lead to a large amount of water leakage, it only leaks a little water, and in some cases water does not leak even if water is passed at room temperature, and when the mold is heated A minute water leak can be detected when a minute crack spreads and water gradually leaks.

According to the present invention, it is possible to provide a mold cooling device capable of detecting water leakage in a cooling system.

It is a schematic block diagram of the metal mold cooling device which concerns on 1st Embodiment of this invention. 6 is a timing chart of cooling water and air flows associated with opening/closing operations of a cooling water solenoid valve, an air solenoid valve, and a return pipe solenoid valve, and an output value of a pressure sensor when a cooling system is in a normal state. 6 is a timing chart of output values of the output sensor when the cooling system is in an abnormal state, (A) is a timing chart of output values of the output sensor when the cooling system has a large amount of water leakage abnormality, and (B) is cooling The timing chart of the output value of the output sensor when the system has a minute water leakage abnormality is shown. 3 is a flowchart showing a flow of processing of a determination unit in the mold cooling device shown in FIG. 1. 3 is a flowchart showing a flow of processing of a determination unit in the mold cooling device shown in FIG. 1. 9 is a flowchart showing a processing flow of a modified example of the determination unit in the mold cooling device shown in FIG. 1. 9 is a flowchart showing a processing flow of a modified example of the determination unit in the mold cooling device shown in FIG. 1. It is a schematic block diagram of the metal mold cooling device which concerns on 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
A mold cooling device according to a first embodiment of the present invention is shown in FIG. 1, and this mold cooling device 1 includes a pressure feeding unit 2 for pressure-feeding cooling water and air, and a mold (not shown). And a mold cooling unit 3 for cooling the above.

Here, the pumping unit 2 is arranged in the vicinity of a casting machine (molding machine), and is connected to a water supply pump 15 which is a water source of the present invention and an air source 16 in a factory or the like via an air pipe 17. The cooling water is controlled by starting the operation by the regulated regulator 18 and the cooling start signal from the casting machine (molding machine) and controlling the opening/closing of the water supply pump 15 and the cooling water solenoid valve 23 and the air solenoid valve 24 described later. And an operation control unit 40 for controlling the pressure feeding of air (ejection amount, ejection timing, etc.). The water supply pump 15 sucks the cooling water in the tank 11 through a pipe (not shown) and sends the water to the second pipe 14. The relief valve 13 is connected to the second pipe 14, and the water pressure in the second pipe 14 is adjusted to the set water pressure. A part of the water is returned to the tank 11. It should be noted that a water pipe may be used as the water source without using the water supply pump 15. The operation control unit 40 is composed of a circuit that controls by a computer program method using a microcomputer.

A plurality of cooling systems 4 are connected to the pressure feeding unit 2. Specifically, from the second pipe 14 of the water supply pump 15, a plurality of cooling water inlet side pipes 21 incorporating the cooling water solenoid valve 23 are branched, and the air source 16 is connected to the air pipe 17 via the air pipe 17. A plurality of air inlet side pipes 22 incorporating an air solenoid valve 24 are branched from the regulator 18 connected by the above. Then, each of the plurality of branched cooling water inlet pipes 21 and each of the plurality of branched air inlet pipes 22 join at each fluid joining portion 25. Each of the fluid merging portions 25 is for merging the cooling water inlet side pipe 21 and the air inlet side pipe 22 to alternately feed the cooling water and the air, and is a check incorporated in the cooling water inlet side pipe 21. A valve 25a and a check valve 25b incorporated in the air inlet pipe 22 are provided. A cooling pipe inlet side pipe 26 is connected to each fluid confluence portion 25. Then, to each cooling pipe inlet side pipe 26, a forward path 27a side of a cooling pipe 27 described later of the mold cooling unit 3 is connected, and a return path 27b side of the cooling pipe 27 is connected to a cooling pipe return pipe 28 described later. One cooling water inlet side pipe 21 incorporating the cooling water solenoid valve 23, one air inlet side pipe 22 incorporating the air solenoid valve 24, one fluid merging portion 25, one cooling pipe inlet side The piping 26, one cooling pipe 27, and one cooling pipe return pipe 28 constitute one cooling system 4.

The mold cooling unit 3 is for cooling a mold (not shown), and includes a reciprocating cooling pipe 27 arranged in a cooling water passage in the mold. The cooling pipe 27 is arranged inside the inukipin or the like provided in the mold. Further, the outward path 27a side of the cooling pipe 27 is connected to each of the cooling tube inlet side pipes 26 described above, and the returning path 27b side of the cooling pipe 27 is connected to the cooling pipe return pipe 28. The cooling pipe return pipe 28 is connected to the tank 11 that stores the cooling water.
In the mold cooling device 1 configured as described above, in order to detect water leakage in each cooling system 4, the mold cooling device 1 incorporates the return pipe solenoid valve 29 into the cooling pipe return pipe 28 and cools the pipe. A pressure sensor 30 is connected to the pipe inlet side pipe 26 as a pressure detector for detecting the pressure of the fluid (cooling water or air) in the cooling pipe inlet side pipe 26.

In the mold cooling device 1, the operation control unit 40 controls not only the opening/closing control of the cooling water electromagnetic valve 23 and the air electromagnetic valve 24, but also the opening/closing of the return piping electromagnetic valve 29. I am trying. As shown in FIG. 2, the operation control unit 40 closes the cooling water electromagnetic valve 23 after opening the cooling water electromagnetic valve 23 and closes the cooling water electromagnetic valve 23 and opens the electromagnetic valve 24 for air, The return piping solenoid valve 29 is controlled to be closed after a predetermined time ta has elapsed since the opening solenoid valve 24 was opened. Then, the operation control unit 40 controls to close the electromagnetic valve for air 24 after the elapse of a predetermined time tb after closing the electromagnetic valve for return pipe 29, and further, for a predetermined time tc after closing the electromagnetic valve for air 24. After the lapse of time, the return pipe solenoid valve 29 is controlled to open.

Here, the predetermined time ta is the time required for the air purge, and is determined according to the time required to expel the cooling water remaining in the cooling system 4. The predetermined time tb is a time suitable for the pressure sensor 30 to detect the air pressure immediately after the return pipe solenoid valve 29 is closed (time A in FIGS. 3A and 3B). Furthermore, the predetermined time tc is the time during which air is filled in the path of the cooling system between the return pipe solenoid valve 29, the air solenoid valve 24, and the cooling water solenoid valve 23. It is preferable that the time is suitable for calculating the pressure difference between the air pressure value immediately after the solenoid valve 29 is closed and the air pressure value immediately before the return piping solenoid valve 29 is opened.

Further, the mold cooling device 1 is based on the opening/closing operation of the cooling water solenoid valve 23, the air solenoid valve 24, and the return pipe solenoid valve 29 by the operation control unit 40 and the pressure value of the fluid detected by the pressure sensor 30. In addition, a determination unit 50 that determines whether or not there is water leakage in the cooling system 4 is provided. The determination unit 50 is arranged in the pumping unit 2. The processing flow of the determination unit 50 is shown in FIGS. 4A and 4B, but a detailed description will be given later.

Next, the flow of cooling water and air accompanying the opening/closing operation of the cooling water solenoid valve 23, the air solenoid valve 24, and the return pipe solenoid valve 29, and the pressure sensor 30 when the cooling system 4 is in a normal state. The output value will be described with reference to FIG. Here, when the cooling system 4 is in a normal state, the cooling water inlet side pipe 21 incorporating the cooling water solenoid valve 23 constituting the cooling system 4 and the air inlet side pipe 22 incorporating the air solenoid valve 24 are included. The fluid merging portion 25, the cooling pipe inlet side pipe 26, the cooling pipe 27, and the cooling pipe return pipe 28 are not damaged or have not come off, and no water leakage has occurred.

First, in a state before the cooling water is pumped from the water supply pump 15, the cooling water electromagnetic valve 23 is closed, the air electromagnetic valve 24 is also closed, and the return piping electromagnetic valve 29 is open. Then, the air having the regulator setting pressure is pressure-fed from the air source 16 through the air pipe 17 and the regulator 18 to the air solenoid valve 24 inside the air inlet pipe 22. However, since the electromagnetic valve 24 for air is closed, air does not flow to the cooling pipe inlet side pipe 26 and the cooling pipe 27 side.

When the operation control unit 40 receives the cooling start signal from the casting machine (molding machine) in this state, the operation control unit 40 starts the operation. Then, the water supply pump 15 operates according to a command from the operation control unit 40 in the pressure feeding unit 2. As a result, the cooling water flows from the tank 11 through the first pipe 12, the relief valve 13, and the second pipe 14 in the cooling water inlet side pipe 21 to the cooling water solenoid valve 23. However, since the cooling water solenoid valve 23 is closed, the cooling water does not flow to the cooling pipe inlet side pipe 26 and the cooling pipe 27 side. This state is shown as STOP (both water and air OFF) in FIG.

In this state, since neither cooling water nor air flows in the cooling pipe inlet side pipe 26, the output value (pressure value) of the pressure sensor becomes atmospheric pressure.
In this state, when the operation control unit 40 controls to open the cooling water electromagnetic valve 23 in order to cool the mold, the cooling water electromagnetic valve 23 opens, and the cooling water flows from the cooling water inlet side pipe 21 into the fluid confluence. It flows through the portion 25, the cooling pipe inlet side pipe 26, and the cooling pipe 27. On the other hand, the operation control unit 40 does not control the air solenoid valve 24 to open, and the air solenoid valve 24 remains closed. This state is shown as water ON (water flow) in FIG. Then, as the cooling water flows through the cooling pipe 27, heat is exchanged there and the mold is cooled. Then, the cooling water is discharged from the return path 27b of the cooling pipe 27 through the cooling pipe return pipe 28 to the tank 11. The operation control unit 40 does not control the return pipe solenoid valve 29 to be closed, and the return pipe solenoid valve 29 remains open.

In this state, the cooling water flows in the cooling pipe inlet side pipe 26 at a pressure close to the relief valve set pressure, so that the output value of the pressure sensor becomes a water pressure close to the relief valve set pressure.
After that, when a predetermined time suitable for cooling the mold has elapsed, the operation control unit 40 controls the cooling water solenoid valve 23 to close and the air solenoid valve 24 to open. As a result, the solenoid valve 23 for cooling water is closed and the solenoid valve 24 for air is opened. Then, air flows from the air inlet pipe 22 through the fluid confluence portion 25, the cooling pipe inlet pipe 26, and the cooling pipe 27. This state is shown as air ON (air purge) in FIG. Then, as the air flows in the cooling pipe 27, the cooling water remaining in the cooling pipe 27 is expelled by the air, and the expelled cooling water passes from the return path 27b of the cooling pipe 27 through the cooling pipe return pipe 28, It is drained to the tank 11.

Here, the pressure of the air flowing through the cooling pipe inlet side pipe 26 is such that the drainage resistance is larger than the exhaust resistance while the cooling water remains in the cooling pipe 27, and the cooling water does not remain during ventilation. A pressure slightly higher than the pressure is measured, the cooling water is expelled and decreases with the passage of time, and converges to the pressure at ventilation when no cooling water remains.
After that, the operation control unit 40 closes the return pipe solenoid valve 29 after a predetermined time ta has elapsed after controlling the air solenoid valve 24 to open (after an appropriate time has elapsed after all drainage has ended). In addition to the above control, the air solenoid valve 24 is controlled to be closed after a predetermined time tb has passed after the return pipe solenoid valve 29 was closed. As a result, the return pipe solenoid valve 29 is closed, and after the return pipe solenoid valve 29 is closed, the air solenoid valve 24 is closed.

When the return pipe solenoid valve 29 is closed, ventilation from the cooling pipe return pipe 28 to the tank 11 is blocked, so that the output value of the pressure sensor 30 is the regulator set pressure by the regulator 18 as shown in FIG. And the output value of the pressure sensor 30 becomes the regulator set pressure.
Further, the air electromagnetic valve 24 is closed to stop the air from flowing in the cooling pipe 27. However, since the return piping electromagnetic valve 29 is closed before that, the return piping electromagnetic valve 29 and the air are Air is filled in the path of the cooling system between the electromagnetic valve 24 for cooling and the electromagnetic valve 23 for cooling water. Here, the output value of the pressure sensor 30 when the path of the cooling system between the return pipe solenoid valve 29, the air solenoid valve 24, and the cooling water solenoid valve 23 is filled with air is the cooling system 4 Since it is normal, there is no air leakage and the regulator set pressure is maintained.

Then, the operation control unit 40 controls to close the electromagnetic valve 24 for air and to open the electromagnetic valve 29 for return pipe after a predetermined time tc has elapsed. As a result, the return pipe solenoid valve 29 is opened. When the return pipe solenoid valve 29 is opened, the air filled in the path of the cooling system between the return pipe solenoid valve 29 and the air solenoid valve 24 and the cooling water solenoid valve 23 is supplied from the cooling pipe return pipe 28 to the tank. It is discharged toward 11.

At this time, since neither cooling water nor air flows in the cooling pipe inlet side pipe 26, the output value (pressure value) of the pressure sensor becomes atmospheric pressure.
When the electromagnetic valve 24 for air is closed, the electromagnetic valve 23 for cooling water is kept closed, and this state is shown as STOP (both water and air OFF) in FIG. ..

After that, the operation control unit 40 stops the operation of the water supply pump 15. As a result, a series of operations of the mold cooling device 1 is completed.
Next, the output value of the pressure sensor 30 when the cooling system 4 is in an abnormal state will be described with reference to FIG. Here, when the cooling system 4 is in an abnormal state, the cooling water inlet side pipe 21 incorporating the cooling water solenoid valve 23 constituting the cooling system 4 and the air inlet side pipe 22 incorporating the air solenoid valve 24 are included. , The fluid merging portion 25, the cooling pipe inlet side pipe 26, the cooling pipe 27, and the cooling pipe return pipe 28 are damaged, and a large amount of water leak occurs, and a minute water leak occurs. If and when.

As an example in which a large amount of water leakage occurs, the cooling water inlet side pipe 21, the air inlet side pipe 22, or the cooling pipe inlet side pipe 26 may come off, a large hole may be opened in the pipe, or the cooling pipe 27 may be broken. There is a case where water or air does not return to the cooling pipe return pipe 28.
Also, as an example of a minute water leak, although it does not lead to a large amount of water leak, it is only a slight amount of water leaks, and in some cases, water does not leak even if water is passed at room temperature, There is a case where when the is heated, a minute crack in the mold is expanded by heating and water is gradually leaked.

First, the output value of the pressure sensor 30 when a large amount of water leaks in the cooling system 4 is shown in FIG. In this case, when the operation control unit 40 controls to open the cooling water electromagnetic valve 23 in order to cool the mold, the cooling water electromagnetic valve 23 opens, but a large amount of water leakage occurs, so that the cooling water is cooled. The pressure of the cooling water in the pipe inlet side pipe 26 does not rise to the normal water pressure set value. Here, the “normal water pressure set value” is the lower limit value of the water pressure considered to be normal, and is a pressure value set to a value slightly lower than the relief valve set pressure by the relief valve 13.

Then, the output value of the pressure sensor 30 remains lower than the normal water pressure set value while the cooling water solenoid valve 23 is open.
Thereafter, while the cooling water electromagnetic valve 23 is closed and the air electromagnetic valve 24 is opened to perform air purging, a large amount of air leaks in the cooling system 4, so that the output value of the pressure sensor 30 is the same as that of the cooling system 4. Keep lower than normal.

After that, even when the return pipe solenoid valve 29 is closed, a large amount of air leaks in the cooling system 4, so the output value of the pressure sensor 30 maintains a value lower than that when the cooling system 4 is normal. It does not rise to the normal air pressure setting value. Here, the “normal air pressure set value” is the lower limit value of the set value of the air pressure that is considered normal, and is a pressure value set to a value slightly lower than the regulator set pressure. Then, after the return pipe solenoid valve 29 is closed, even if the air solenoid valve 24 is closed, the output value of the pressure sensor 30 remains lower than that when the cooling system 4 is normal, and the normal air pressure is set. It does not rise to the value.

After that, when the return pipe solenoid valve 29 is opened, the output value (pressure value) of the pressure sensor becomes equal to the atmospheric pressure.
Next, the output value of the pressure sensor 30 when a minute water leak occurs in the cooling system 4 is shown in FIG. 3(B).
In this case, the output value of the pressure sensor 30 is substantially the same as the output value of the pressure sensor 30 when the cooling system 4 is in the normal state shown in FIG. 2 until the return pipe solenoid valve 29 is closed. Therefore, when the return pipe solenoid valve 29 is closed, ventilation from the cooling pipe return pipe 28 to the tank 11 is blocked, so the output value of the pressure sensor 30 becomes substantially equal to the regulator set pressure by the regulator 18, The output value of the pressure sensor 30 is substantially equal to the regulator set pressure.

When the air solenoid valve 24 is closed after the return pipe solenoid valve 29 is closed, the cooling system between the return pipe solenoid valve 29, the air solenoid valve 24, and the cooling water solenoid valve 23. Is filled with air. However, when a slight water leak occurs in the cooling system 4, air also leaks slightly, so that the output value of the pressure sensor 30 decreases from a value close to the regulator set pressure. The lowering speed of the pressure value becomes faster as the amount of air leakage increases.

After that, when the return pipe solenoid valve 29 is opened, the output value (pressure value) of the pressure sensor becomes equal to the atmospheric pressure.
Next, a processing flow of the determination unit 50 will be described with reference to FIGS. 4A and 4B.
The detection of the pressure value by the pressure sensor 30 is always performed during the operation of the mold cooling device 1, while the determination unit 50 first determines whether the cooling water solenoid valve 23 is opened by the operation control unit 40 in step S11. To judge. If the cooling water solenoid valve 23 is not open, the determination is repeated, and if the cooling water solenoid valve 23 is open, the process proceeds to step S12.

Next, in step S12, the determination unit 50 determines whether or not the cooling water solenoid valve 23 is closed and the air solenoid valve 24 is opened by the operation control unit 40. If the cooling water solenoid valve 23 is closed and the air solenoid valve 24 is not open, the determination is repeated. If the cooling water solenoid valve 23 is closed and the air solenoid valve 24 is open, the process proceeds to step S13. To do.

Further, in step S13, the determination unit 50 determines whether or not the return pipe solenoid valve 29 is closed by the operation control unit 40. If the return pipe solenoid valve 29 is not open, the determination is repeated. If the return pipe solenoid valve 29 is open, the process proceeds to step S14.
Then, in step S14, the determination unit 50 obtains the pressure value of the air detected by the pressure sensor 30 immediately after the return pipe solenoid valve 29 is closed (at time A in FIGS. 3A and 3B). To do.

Next, in step S15, the determination unit 50 compares the air pressure value acquired in step S14 with the normal air pressure set value, and determines whether the pressure value is lower than the normal air pressure set value. Here, the “normal air pressure set value” is a pressure value of air considered to be normal, and means a pressure value slightly lower than the regulator set pressure by the regulator 18. Then, when the pressure value is lower than the normal air pressure set value, the process proceeds to step S16, and the determination unit 50 determines that there is a large amount of water leakage abnormality, determines that there is water leakage, and ends the processing. To do. On the other hand, if the pressure value is equal to or higher than the normal air pressure set value, the process proceeds to step S17.

Then, in step S17, the determination unit 50 determines whether or not the air solenoid valve 24 is closed by the operation control unit 40. If the air solenoid valve 24 is not closed, the determination is repeated. If the air solenoid valve 24 is closed, the process proceeds to step S18.
In step S18, the determination unit 50 determines the air pressure value immediately before the return pipe solenoid valve 29 is opened (time B in FIG. 3B) after the elapse of a predetermined time tc from closing the air solenoid valve 24. get.

Next, in step S19, the determination unit 50 calculates the pressure difference between the air pressure value acquired in step S14 and the air pressure value acquired in step S18.
Then, in step S20, the determination unit 50 determines whether or not the air pressure difference calculated in step S19 is larger than the minute leak abnormality set value. Here, the "small leak abnormality set value" is a pressure change width of the air due to the leak, and is a differential pressure of the air considered to be a minute leak. Then, when the pressure difference is larger than the minute leakage abnormality set value, the determination unit 50 determines that there is a minute water leakage abnormality, determines that there is water leakage, and proceeds to step S21. finish. On the other hand, when the pressure difference is equal to or less than the minute leak abnormality set value, the process proceeds to step S22, and the determination unit 50 determines that there is no water leakage in the cooling system 4, and the process ends.

As described above, according to the mold cooling device of the present embodiment, the opening/closing operation of the cooling water electromagnetic valve 23, the air electromagnetic valve 24, and the return piping electromagnetic valve 29 by the operation control unit 40 and the pressure sensor 30 detect the operation. The determination unit 50 that determines the presence or absence of water leakage in the cooling system 4 is provided based on the pressure value of the fluid that is generated. Therefore, it is possible to provide the mold cooling device 1 capable of detecting water leakage in the cooling system 4.

Further, the determination unit 50 compares the pressure value of the air immediately after the return pipe solenoid valve 29 is closed, which is detected by the pressure sensor 30, with the normal air pressure set value, and the pressure value is lower than the normal air pressure set value. If it is low, it is determined that there is a large amount of water leakage abnormality and it is determined that there is water leakage (steps S14 to S16). Therefore, a large amount of water leakage in the cooling system 4 can be detected. Thereby, for example, the cooling water inlet side pipe 21, the air inlet side pipe 22, or the cooling pipe inlet side pipe 26 is pulled out, a large hole is opened in the pipe, the cooling pipe 27 is broken, and the cooling pipe return pipe 28 is provided. It is possible to detect a large amount of water leakage when water or air does not return.

Further, the determination unit 50 detects the pressure value of the air immediately after closing the return pipe solenoid valve 29 detected by the pressure sensor 30 and the return pipe after a predetermined time tc has elapsed after closing the air solenoid valve 24. The pressure difference from the pressure value of the air immediately before opening the solenoid valve 29 for use is calculated, and when the calculated pressure difference is larger than the minute leakage abnormality set value, it is judged as a minute water leakage abnormality and there is water leakage. (Step S14, step S17 to step S21). Therefore, not only a large amount of water leakage in the cooling system 4 but also a small amount of water leakage in the cooling system 4 can be detected. Since the timing of steps S11 to S21 of passing water and air purging for cooling the mold is the timing at which the mold is heated, a large amount of water does not leak, but only slightly leaks water, and in some cases, Even if water is passed through at room temperature, water does not leak, and when the mold is heated, minute cracks in the mold spread and the minute water leak can be detected when water gradually leaks.

Next, a modified example of the determination unit 50 will be described with reference to FIGS. 5A and 5B.
5A and 5B show a processing flow of a modified example of the determination unit 50. The modified example of the determination unit 50 is different from the determination unit 50 illustrated in FIGS. 4A and 4B in the process of determining a large amount of water leakage abnormality.
That is, the determination unit 50 according to the modification first determines whether or not the cooling water solenoid valve 23 is opened by the operation control unit 40 in step S101. If the cooling water solenoid valve 23 is not open, the determination is repeated. If the cooling water solenoid valve 23 is open, the process proceeds to step S102.

Next, in step S102, the determination unit 50 acquires the pressure value of the cooling water detected by the pressure sensor 30 immediately after the electromagnetic valve 23 for cooling water is opened (time C in FIG. 3A).
Next, in step S103, the determination unit 50 compares the pressure value of the cooling water acquired in step S102 with the normal water pressure set value, and determines whether the pressure value is lower than the normal water pressure set value. Here, the “normal water pressure set value” is the lower limit value of the water pressure that is considered normal, and means a pressure value that is slightly lower than the relief valve set pressure. When the pressure value is lower than the normal water pressure set value, the process proceeds to step S104, and the determination unit 50 determines that there is a large amount of water leakage abnormality, determines that there is water leakage, and ends the processing. To do. On the other hand, when the pressure value is equal to or higher than the normal water pressure set value, the process proceeds to step S105.

Then, in step S105, the determination unit 50 determines whether or not the cooling water solenoid valve 23 is closed and the air solenoid valve 24 is opened by the operation control unit 40. If the cooling water solenoid valve 23 is closed and the air solenoid valve 24 is not open, the determination is repeated. If the cooling water solenoid valve 23 is closed and the air solenoid valve 24 is open, the process proceeds to step S106. To do.

Further, in step S106, the determination unit 50 determines whether or not the return pipe solenoid valve 29 is closed by the operation control unit 40. If the return pipe solenoid valve 29 is not closed, the determination is repeated, and if the return pipe solenoid valve 29 is opened, the process proceeds to step S107.
Then, in step S107, the determination unit 50 acquires the air pressure value detected immediately by the pressure sensor 30 immediately after the return piping solenoid valve 29 is closed (at the time point A in FIGS. 3A and 3B). To do.

Next, the determination unit 50 determines whether or not the air solenoid valve 24 is closed by the operation control unit 40 in step S108. If the air solenoid valve 24 is not closed, the determination is repeated, and if the air solenoid valve 24 is closed, the process proceeds to step S109.
Then, in step S109, the determination unit 50 determines the air pressure immediately before the return pipe solenoid valve 29 is opened (time B in FIG. 3B) after the elapse of a predetermined time tc from closing the air solenoid valve 24. Get the value.

Next, in step S110, the determination unit 50 calculates the pressure difference between the air pressure value acquired in step S107 and the air pressure value acquired in step S109.
Then, in step S111, the determination unit 50 determines whether or not the air pressure difference calculated in step S110 is larger than the minute leak abnormality set value. Here, the “small leak abnormality set value” has the same meaning as defined above. Then, when the pressure difference is larger than the minute leakage abnormality set value, the process proceeds to step S112, and the determination unit 50 determines that there is a minute water leakage abnormality and determines that there is water leakage. finish. On the other hand, when the pressure difference is equal to or less than the minute leak abnormality set value, the process proceeds to step S113, and the determination unit 50 determines that there is no water leakage in the cooling system 4 and is normal, and the process ends.

In the case of the determination unit 50 according to this modification, the determination unit 50 compares the pressure value of the cooling water detected by the pressure sensor 30 immediately after the cooling water solenoid valve 23 is opened with the normal water pressure set value. Then, if the pressure value is lower than the normal water pressure set value, it is determined that there is a large amount of water leakage abnormality and it is determined that there is water leakage (steps S102 to S104). Therefore, a large amount of water leakage in the cooling system 4 can be detected. Thereby, for example, the cooling water inlet side pipe 21, the air inlet side pipe 22, or the cooling pipe inlet side pipe 26 is pulled out, a large hole is opened in the pipe, the cooling pipe 27 is broken, and the cooling pipe return pipe 28 is provided. It is possible to detect a large amount of water leakage when water or air does not return.

Also in the determination unit 50 according to the modified example, the pressure value of the air immediately after the return pipe solenoid valve 29 is closed, which is detected by the pressure sensor 30, and the predetermined time tc after the air solenoid valve 24 is closed. After a lapse of time, a pressure difference from the pressure value of the air immediately before opening the return pipe solenoid valve 29 is calculated, and when the calculated pressure difference is larger than the minute leakage abnormality set value, it is determined to be a minute water leakage abnormality. It is determined that there is water leakage (step S107 to step S112). Therefore, not only a large amount of water leakage in the cooling system 4 but also a small amount of water leakage in the cooling system 4 can be detected. Although this does not lead to a large amount of water leakage, it does not leak even if the water leaks at room temperature, even if water slightly leaks out. A minute water leak can be detected when a minute crack spreads and water gradually leaks.

(Second embodiment)
Next, a mold cooling device according to the second exemplary embodiment of the present invention will be described with reference to FIG. 6, the same members as those shown in FIG. 1 are designated by the same reference numerals, and the description thereof may be omitted.
The mold cooling device 1 shown in FIG. 6 has the same basic configuration as the mold cooling device 1 shown in FIG. 1, but the cooling pipe inlet side pipe 26 in the cooling system 4 has a water intake port (not shown) of the cooling water manifold 60. _No. ) is connected to each of the plurality of (n) outward passage ports 61 of the cooling water manifold 60, and each of the plurality of outward passage pipes 63 _{1 to} 63 _n is connected to the plurality of outward passage pipes 63 _{1 to} 63 _n. Each of the plurality of (n) reciprocating cooling pipes 27 _{1 to} 27 _n (only the cooling pipe 27 ₁ is shown) connected to the outward path 27a side, and each of the plurality of cooling tubes 27 _{1 to} 27 _n is returned to the return path. return side port of the plurality of (n) of a plurality of each of the return pipe ₆₄ 1 to 64 _n with connecting each of the return pipe ₆₄ 1 to 64 _n a plurality of cooling water manifold 60 (n-number) to 27b side It is different in that it is connected to each of 62 and the cooling pipe return pipe 28 is connected to the drain port of the cooling water manifold 60.

More specifically, the cooling water manifold 60 includes one water intake port (not shown) and one drain port (not shown), and has a plurality of forward path side ports 61 and a plurality of return path side ports. And 62.
Then, the water intake port of the cooling water manifold 60 is connected to the outlet side of the cooling pipe inlet side pipe 26 in the cooling system 4, and each of the plurality of outgoing route side ports 61 of the cooling water manifold 60 has a plurality of outgoing route side pipes 63. Each of _{1 to} 63 _n is connected.

Then, each of the exit side of the plurality of outgoing pipe ₆₃ 1 to 63 _n, with forward 27a side of each of the plurality of cooling pipes ₂₇ 1 ~ 27 _n are connected, a plurality of cooling pipes ₂₇ 1 ~ 27 _n for A plurality of return passage side pipes 64 ₁ to 64 _n are connected to each return passage 27 b side. Moreover, the outlet side of each of the plurality of return passage side pipes 64 ₁ to 64 _n is connected to each of the plurality of outward passage side ports 61 of the cooling water manifold 60, and the cooling pipe is provided at the drain port of the cooling water manifold 60. The return pipe 28 is connected.

As described above, by providing the cooling water manifold 60, the cooling system 4 includes one cooling water inlet side pipe 21 incorporating the cooling water solenoid valve 23 and one air inlet including the air solenoid valve 24. The side pipe 22, one fluid confluence portion 25, one cooling pipe inlet side pipe 26, the outward side of the cooling water manifold 60, one outward side pipe 63 ₁ , one cooling pipe 27 ₁ , one return side A pipe 64 ₁ , a return path of the cooling water manifold 60, and a first system 41 constituted by one cooling pipe return pipe 28 and _one cooling water inlet incorporating the electromagnetic valve 23 for cooling water. Side pipe 21, one air inlet pipe 22 incorporating an electromagnetic valve 24 for air, one fluid confluence portion 25, one cooling pipe inlet pipe 26, outward side of the cooling water manifold 60, one outward route The second system 4 _{2 including the} side pipe 63 ₂ , one cooling pipe 27 ₂ , one return side pipe 64 ₂ , the return side of the cooling water manifold 60, and one cooling pipe return pipe 28. ,... and the nth system 4 _n .

Further, in order to detect water leakage in each of the first system 4 ₁ to the n-th system 4 _n forming the cooling system 4, a return pipe solenoid valve 29 is incorporated in the cooling pipe return pipe 28, and a plurality of outward routes are provided. in either one position of the side pipe ₆₃ 1-63 _n, the pressure sensor 30 is connected as a pressure detector for detecting the pressure of a fluid (cooling water or air) for each outgoing pipe ₆₃ 1-63 in _n.

Further, the mold cooling device 1 is similar to the mold cooling device 1 shown in FIG. 1, and an operation control unit 40 that controls opening/closing of the cooling water solenoid valve 23, the air solenoid valve 24, and the return pipe solenoid valve 29. Equipped with. The control operation of the operation control unit 40 is similar to the control operation of the operation control unit 40 of the mold cooling device 1 shown in FIG. 1, as shown in FIG. The solenoid valve 23 is closed, the air solenoid valve 24 is opened, and the return piping solenoid valve 29 is controlled to be closed after a predetermined time ta has elapsed since the air solenoid valve 24 was opened. In addition, the operation control unit 40 controls to close the electromagnetic valve 24 for air after the elapse of a predetermined time tb after closing the electromagnetic valve 29 for return piping, and further, for a predetermined time tc after closing the electromagnetic valve 24 for air. After the lapse of time, the return pipe solenoid valve 29 is controlled to open.

Further, the mold cooling device 1 is similar to the mold cooling device 1 shown in FIG. 1, and the opening/closing operation of the cooling water solenoid valve 23, the air solenoid valve 24, and the return piping solenoid valve 29 by the operation control unit 40. Based on the pressure value of the fluid detected by each pressure sensor 30 connected to each of the plurality of outward path pipes 63 _{1 to} 63 _n , each of the first path 4 ₁ to the n-th path 4 _n that configures the cooling system 4. The determination unit 50 for determining the presence/absence of water leakage is provided. The process flow of the determination unit 50 is shown in FIGS. 4A and 4B, as in the determination unit 50 in the mold cooling device 1 shown in FIG.

As described above, also in the mold cooling device 1 of the type in which the cooling water manifold 60 is provided and the cooling system 4 is composed of a plurality (n pieces) of the first system 4 ₁ to the n-th system 4 _n , as described above, The determination unit 50 that determines the presence or absence of water leakage in each of the first system 4 ₁ to the n-th system 4 _n that configures the cooling system 4 is provided. Therefore, it is possible to detect water leakage in each of the first system 4 ₁ to the n-th system 4 _n that configure the cooling system 4.

Further, the determination unit 50, like the determination unit 50 of the mold cooling device 1 shown in FIG. 1, indicates the pressure value of the air immediately after the return pipe solenoid valve 29 is closed, which is detected by the pressure sensor 30, as a normal air pressure value. If the pressure value is lower than the normal air pressure set value as compared with the pressure set value, it is determined that there is a large amount of water leakage abnormality and it is determined that there is water leakage (steps S14 to S16). Therefore, it is possible to detect a large amount of water leakage in each of the first system 4 ₁ to the n-th system 4 _n that configures the cooling system 4.

Further, the determination unit 50, similar to the determination unit 50 of the mold cooling device 1 shown in FIG. 1, detects the pressure value of air immediately after the return pipe solenoid valve 29 is closed and the air pressure detected by the pressure sensor 30. The pressure difference from the pressure value of the air immediately before the return piping solenoid valve 29 is opened after the elapse of a predetermined time tc from the closing the solenoid valve 24 is calculated, and the calculated pressure difference is lower than the minute leakage abnormality set value. When it is large, it is determined that there is a minute water leakage abnormality and it is determined that there is water leakage (step S14, step S17 to step S21). Therefore, not only a large amount of water leakage in each of the first system 4 ₁ to n-th system 4 _n that configures the cooling system 4 but also a minute amount of water leakage in each of the first system 4 ₁ to n-th system 4 _n is detected. can do.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and improvements can be made.
For example, in the mold cooling device 1 according to the first embodiment, the pressure sensor 30 is connected not to the cooling pipe inlet side pipe 26 but to the inlet side of the return pipe solenoid valve 29 of the cooling pipe return pipe 28. May be.

Further, in the mold cooling device 1 according to the second embodiment, the pressure sensor 30 may be connected not to the forward path side pipes 63 _{1 to} 63 _n but to the return path side pipes 64 ₁ to 64 _n .
In the mold cooling device 1 according to the second embodiment, the process flow of the determination unit 50 is set to be the same as the process flow illustrated in FIGS. 5A and 5B, and the determination unit 50 detects the pressure sensor 30. The pressure value of the cooling water immediately after the electromagnetic valve for cooling water 23 is opened is compared with the normal water pressure set value, and if the pressure value is lower than the normal water pressure set value, it is determined that a large amount of water leakage has occurred. It may be determined that there is water leakage (steps S102 to S104).

Further, in the mold cooling device 1 according to the second embodiment, of the plurality (n) of the outward path ports 61 of the cooling water manifold 60, the number of outward path pipes to be connected is arbitrary and one outward path port 61. It is also possible to connect only one outward pipe ( _{one of} 63 _{1 to} 63 _n ). In this case, the outgoing path 27a side of one cooling pipe (one of 27 _{1 to} 27 _n ) is connected to the outgoing side of one outgoing path side pipe ( _{one of} 63 _{1 to} 63 _n ), and this cooling is performed. One return side pipe (one of 64 ₁ to 64 _n ) is connected to the return route 27b side of the pipe ( _{one of} 27 _{1 to} 27 _n ), and this return side pipe (of 64 ₁ to 64 _n ) is connected. One of them) is connected to one return side port 62 of the cooling water manifold 60.

DESCRIPTION OF SYMBOLS 1 Mold cooling device 2 Pumping section 3 Mold cooling section 4 Cooling system 4 ₁ 1st system 4 ₂ 2nd system 4 _n nth system 11 Tank 12 1st piping 13 Relief valve 14 2nd piping 15 Water supply pump 16 Air source 17 Air Piping 18 Regulator 21 Cooling Water Inlet Piping 22 Air Inlet Piping 23 Cooling Water Solenoid Valve 24 Air Solenoid Valve 25 Fluid Merging Port 25a, 25b Check Valve 26 Cooling Pipe Inlet Piping 27, 27 _{1 to} 27 _n Cooling pipe 27a Forward of cooling pipe 27b Return of cooling pipe 28 Cooling pipe return pipe 29 Return pipe solenoid valve 30 Pressure sensor (pressure detector)
40 Operation Control Unit 50 Judgment Unit 60 Cooling Water Manifold 61 Outgoing Side Port 62 Returning Route Side 63 _{1 to} 63 _n Outgoing Side Pipe 64 ₁ to 64 _n Returning Side Pipe

Claims (4)

A cooling water inlet side pipe connected to a water source and incorporating a cooling water solenoid valve, an air inlet side pipe connected to an air source and incorporating an air solenoid valve, the cooling water inlet side pipe and the air A cooling pipe inlet side pipe connected to a fluid confluence part for joining the inlet side pipe, a reciprocating cooling pipe installed in the mold and connected to the cooling pipe inlet side pipe on the outward path, and the reciprocating Equipped with a cooling pipe return pipe connected to the return path side of the cooling pipe of the formula,
While incorporating a return pipe solenoid valve in the cooling pipe return pipe, the cooling pipe inlet side pipe, or the inlet side of the return pipe solenoid valve of the cooling pipe return pipe, in the cooling pipe inlet side pipe or the Connect a pressure detector that detects the pressure of the fluid in the cooling pipe return pipe,
An operation control unit that controls opening and closing of the cooling water solenoid valve, the air solenoid valve, and the return pipe solenoid valve,
Water leakage in the cooling system based on the opening/closing operations of the cooling water solenoid valve, the air solenoid valve, and the return pipe solenoid valve by the operation control unit and the pressure value of the fluid detected by the pressure detector. And a determination unit for determining the presence or absence of
The operation control unit opens the electromagnetic valve for cooling water, then closes the electromagnetic valve for cooling water, opens the electromagnetic valve for air, and opens the electromagnetic valve for air, and returns the return pipe after a lapse of a predetermined time. The solenoid valve for air is controlled to be closed, and the solenoid valve for air is controlled to be closed after a predetermined time has passed since the solenoid valve for return piping was closed, and further, the solenoid valve for air is closed for a predetermined time. the return to Rukin type and wherein the controller controls to open the solenoid valve pipe cooling device after the course. The determination unit compares the pressure value of the air, which is detected by the pressure detector, immediately after the return pipe solenoid valve is closed with a normal air pressure set value, and the pressure value is lower than the normal air pressure set value. The mold cooling device according to claim 1 , wherein when the water leakage is low, it is determined that there is a large amount of water leakage abnormality and it is determined that there is water leakage. The determination unit compares the pressure value of the cooling water detected by the pressure detector immediately after the cooling water solenoid valve is opened with the normal water pressure set value, and the pressure value is the normal water pressure set value. The mold cooling device according to claim 1 , wherein when it is lower than the above, it is determined that there is a large amount of water leakage abnormality and it is determined that there is water leakage. The determining unit detects the pressure value of the air immediately after the return pipe solenoid valve is closed, which is detected by the pressure detector, and the return pipe for a predetermined time after the air solenoid valve is closed. Calculate the pressure difference from the pressure value of the air just before opening the solenoid valve, and if the calculated pressure difference is larger than the minute leak abnormality set value, judge as a minute water leakage abnormality and determine that there is water leakage. The mold cooling device according to any one of claims 1 to 3 , wherein:

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