Mold cooling system for injection molding machines

Abstract

In order to provide a die cooling system for an injection molding machine in which hose piping is done in a narrow space covered by a safety cover so as to prevent a coupling error, in a die cooling system for an injection molding machine 1 in which cooling water is supplied from a cooling water supply source 12 to a plurality of cooling water channels 10 of a die 2 attached to platens 3, 4 via a valve stand 13, the valve stand 13 comprises an inlet circuit 20 having a main inlet valve 18 and an outlet circuit 21 having a main outlet valve 19 protruding from a lateral face side of the platens 3, 4 toward a safety cover 9 of the injection molding machine 1. The main inlet valve 18 and the main outlet valve 19 are connected to the cooling water supply source 12. A plurality of open / close valves 15 are provided on the inlet circuit 20 and the outlet circuit 21 at predetermined intervals in the protrusion direction such that hoses 16 connected to the open / close valves 15 hang down in a bead curtain-like shape. A coupling 17 connected to the cooling water channel 10 is provided at the end of the hoses 16.

Description

[Technical Field]

[0001] The present invention relates to a mold cooling system for an injection molding machine. [Background technology]

[0002] BACKGROUND ART A conventional mold cooling system for an injection molding machine is, for example, that shown in "FIGS. 1 to 4" of Patent Publication No. 20009-001402 (Patent Document 1).

[0003] In this conventional system, cooling water is supplied to multiple cooling water passages in the mold via multiple hoses from a cooling water supply / discharge unit connected to a cooling water supply source. The multiple hoses are connected to the side of a platen, and the platen and the mold are connected by a coupling device.

[0004] However, in general conventional systems, the multiple hoses are connected to the side of the mold, not to the side of the platen, and the cooling water supply / discharge unit has a valve stand (branching pipe device) that branches a single pipe from a cooling water supply source into multiple pipes (the number of hoses), and the hoses are connected to the opening / closing valves of this valve stand.

[0005] There are many different types of molds that can be attached to the platen, and the number of cooling water passages varies, but the number of hoses is set to the maximum number of cooling water passages for a large mold.When attaching a small mold with few cooling water passages, there are excess hoses to be connected, and the open / close valves for these excess hoses are closed.

[0006] In the case of the conventional hose piping to the side of a mold, when changing the mold, a joint at the end of the hose and a joint on the side of the mold must be connected and disconnected. During the disconnection process, the hoses disconnected from the mold become tangled and messy, which causes a problem of spoiling the aesthetics of the factory.

[0007] Furthermore, during the joining process, it is necessary to select the hose joint to be joined to the mold joint, but the task of selecting the joint for the disorganized hose becomes difficult, which may result in incorrect joining to the mold.

[0008] That is, as shown in Figure 24, a conventional valve stand 50 comprises an inlet branching pipe device 51 and an outlet branching pipe device 52. The inlet branching pipe device 51 branches cooling water from a single cooling water supply pipe 53 into multiple hoses 54 and supplies it to the mold. The outlet branching pipe device 52 combines drainage water from the mold from multiple hoses 55 into a single drainage pipe 56. One end of the hoses 54, 55 is connected to an open / close valve 57, and the other ends of the hoses 54, 55 are provided with joints 58 that are connected to joints on the mold.

[0009] When the connection between the mold and the hoses 54, 55 is released during mold replacement work, the released hoses 54, 55 become tangled and messy, as shown in Figure 24, and there is also the problem that during the reconnection work, it becomes difficult to select the couplings 58 for the messy hoses 54, 55. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] International Publication No. 2009 / 001402 Summary of the Invention [Problem to be solved by the invention]

[0011] In the conventional injection molding machine, the mold is covered with a safety cover for safety reasons. The distance between the side of the platen and the safety cover is narrow, and the hoses are routed in this narrow space. In addition, the valve stand is located away from the mold, making it difficult to check whether the valve is open or closed from the connection position during the connection work, and also making it difficult to select a fitting for the tangled hose end.

[0012] Therefore, it is desirable to arrange the hose piping so that the opening and closing valve can be seen from the connecting work position.

[0013] However, it was extremely difficult to install hoses in such a small space covered by a safety cover in a way that prevented incorrect connections.

[0014] An object of the present invention is to provide a mold cooling system for an injection molding machine that solves the above-mentioned problems. [Means for solving the problem]

[0015] In order to achieve the above object, the present invention provides the following: That is, the present invention is a mold cooling system for an injection molding machine in which cooling water is supplied from a cooling water supply source via a valve stand to multiple cooling water passages of a mold attached to a platen, the valve stand having an inlet circuit with a main inlet valve and an outlet circuit with a main outlet valve so as to protrude from a side surface of the platen toward a safety cover of the injection molding machine, the main inlet valve and the main outlet valve are connected to the cooling water supply source, a plurality of on-off valves are provided in the inlet circuit and the outlet circuit at predetermined intervals in the protruding direction, hoses connected to the on-off valves are provided so as to hang down in a blind-like pattern, and the hoses have fittings at their ends that are connected to the cooling water passages.

[0016] It is preferable that the inlet circuit and the outlet circuit are formed in a block body provided on a side surface of the platen, the main inlet valve and the main outlet valve are connected to the cooling water supply source and are provided in the block body, the inlet circuit and the outlet circuit communicating with the on-off valve, the main inlet valve and the main outlet valve are formed within the block body, an air supply valve is connected to the inlet circuit, and a drain valve is connected to the outlet circuit.

[0017] It is preferable that the main inlet valve, main outlet valve, air supply valve, and drain valve are provided on the underside of the block body, and that the air supply valve and the plurality of opening and closing valves are arranged in a straight line with a difference in height.

[0018] The main inlet valve and air supply valve are provided on the underside of the block body, the main outlet valve and drain valve are provided on the side of the block body, and the air supply valve and the multiple on-off valves can be arranged in a straight line with a difference in height.

[0019] The air supply valve may be provided on the underside of the block body, the main inlet valve, the main outlet valve, and the drain valve may be provided on the side of the block body, and the air supply valve and the multiple on-off valves may be arranged in a straight line with a difference in height. It is preferable that the inlet circuit and the outlet circuit are formed in a block body that is provided so that its position can be changed relative to the side surface of the platen, and that communication passages that communicate with the on-off valve, the main inlet valve, and the main outlet valve are formed within the block body, and that an air supply valve is connected to the inlet circuit and a drain valve is connected to the outlet circuit. [Effects of the Invention]

[0020] According to the present invention, the opening and closing valves of the valve stand, the hose joints, and the joints of the mold can be visually inspected, and the mold changing worker can easily select the hose joint to be connected to the joints of the mold. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a perspective view of an injection molding machine equipped with a mold cooling system, viewed from the opposite side of the operation side. [Figure 2] FIG. 2 is an enlarged perspective view of part A in FIG. 1. [Figure 3] FIG. 2 is a plan view of the platen according to the embodiment of the present invention as viewed from above. [Figure 4] FIG. 2 is a front view of the platen according to the embodiment of the present invention as viewed from above. [Figure 5] FIG. 2 is a side view of the platen according to the embodiment of the present invention as viewed from above. [Figure 6] Piping circuit diagram. [Figure 7] FIG. 2 is an explanatory diagram of the IN circuit of the valve stand of the first embodiment. [Figure 8] Cross-sectional view showing the IN side main air circuit of the CC line in Figure 7. [Figure 9] FIG. 2 is an explanatory diagram of the OUT circuit of the valve stand of the first embodiment. [Figure 10] 10 is a cross-sectional view showing the OUT-side main circuit of the DD line in FIG. 9; [Figure 11] FIG. 10 is a cross-sectional view showing the drain circuit of the EE line in FIG. 9; [Figure 12] FIG. 10 is an explanatory diagram of the IN circuit of the valve stand of the second embodiment. [Figure 13] 13 is a cross-sectional view showing an IN side main circuit of the JJ line in FIG. 12. [Figure 14] FIG. 13 is a cross-sectional view showing the air circuit of the KK line in FIG. 12. [Figure 15] FIG. 10 is an explanatory diagram of the OUT circuit of the valve stand of the second embodiment. [Figure 16] 16 is a cross-sectional view showing the OUT-side main circuit of line LL in FIG. 15. [Figure 17] FIG. 16 is a cross-sectional view showing the drain circuit of the MM line of FIG. [Figure 18] FIG. 10 is an explanatory diagram of the IN circuit of the valve stand of the third embodiment. [Figure 19] 19 is a cross-sectional view showing the IN side main circuit of the PP line in FIG. 18. [Figure 20] FIG. 19 is a cross-sectional view showing the air circuit of the QQ line in FIG. 18. [Figure 21] FIG. 10 is an explanatory diagram of the OUT circuit of the valve stand of the third embodiment. [Figure 22] 22 is a cross-sectional view showing the OUT-side main circuit of the RR line in FIG. 21. [Figure 23] 22 is a cross-sectional view showing the drain circuit of the SS line in FIG. 21; [Figure 24] FIG. 1 is an explanatory diagram of hose piping of a conventional valve stand. [Figure 25] FIG. 10 is a perspective view of a fourth embodiment. [Figure 26] FIG. 10 is a front view showing a part of the fourth embodiment in cross section. [Figure 27] FIG. 10 is a side view showing a part of the fourth embodiment in cross section. [Figure 28] FIG. 10 is a bottom view showing a part of the fourth embodiment in cross section. [Figure 29] 26A and 26B are enlarged views of part A, where (a) shows the locked position and (b) shows the unlocked position. [Figure 30] FIG. 10 is a plan view showing a change in the position of the block body. [Figure 31] This is an explanatory diagram of operation when the block body is in the 0 degree position, where (a) is a plan view with the safety door open, and (b) is a side view. [Figure 32] An explanatory diagram of operation at a 45-degree or 90-degree position of the block body, (a) is a plan view with the safety door closed, and (b) is a side view. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 6, the mold cooling system for an injection molding machine is a system that cools from the inside a mold 2 that is detachably attached to an injection molding machine 1 installed in a molding factory.

[0023] The injection molding machine 1 has a fixed platen 3 and a movable platen 4, and a fixed mold 2a and a movable mold 2b are detachably mounted on the platens 3, 4, respectively.

[0024] The injection molding machine 1 is equipped with four guide rods 5 that guide and support the movable platen 4 so that it can move freely, a movable platen drive mechanism 6 that has a hydraulic cylinder (or a drive motor) that drives the movable platen 4 in a direction to move toward or away from the fixed platen 3 in order to clamp and open the mold 2, and an injection mechanism 8 that has an injection cylinder 7 for supplying molten synthetic resin to the cavity inside the mold in the clamped state.

[0025] The platens 3 and 4 are made of a magnetic steel material, have multiple magnet units (magnetic force generating mechanisms) that generate magnetic attraction force, and are configured as a magnetic clamping device that can be switched between an attraction state and a non-attraction state.

[0026] The present invention is not limited to a magnetic clamping device, and the mold 2 may be detachably fixed to the platens 3 and 4 by a hydraulic clamping device or the like.

[0027] For safety reasons, the injection molding machine 1 is provided with a safety cover 9 that covers the mold 2. The safety cover 9 is provided so that its position can be changed by sliding it laterally between a position that covers the side of the mold 2 and a position that opens the side.

[0028] A plurality of cooling water passages 10 for cooling the mold 2 are formed inside the mold 2 (see FIG. 6). Joints 11 are provided at the inlets (IN) and outlets (OUT) of the cooling water passages 10. These joints 11 are provided on the side of the mold 2 on the safety cover 9 side.

[0029] In the mold cooling system, cooling water is supplied to and discharged from a cooling water supply source (temperature regulator) 12 (see Figure 1) via a valve stand 13 to multiple cooling water passages 10 in molds 2a and 2b attached to platens 3 and 4.

[0030] The valve stand 13 has an inlet circuit 20 and an outlet circuit 21 provided on the side of the platens 3, 4 so as to protrude from the side of the platens 3, 4 toward the safety cover 9 of the injection molding machine (see Figure 6). A main inlet valve 18 is provided in the inlet circuit 20, and a main outlet valve 19 is provided in the outlet circuit 21. A plurality of on-off valves 15 are provided on the inlet circuit 20 and the outlet circuit 21 at predetermined intervals in the protruding direction, and hoses 16 connected to the on-off valves 15 are provided so as to hang down in a blind-like pattern (see Figure 5). Specifically, the inlet circuit 20 and the outlet circuit 21 are formed in a block body 14 provided on the side of the platens 3, 4.

[0031] The block body 14 has a plurality of on-off valves 15 on the underside thereof, and hoses 16 connected to the valves 15 in a hanging manner. The ends of the hoses 16 have joints 17 connected to the cooling water passages 10 of the mold 2.

[0032] In this embodiment, the fitting 11 provided on the side of the mold 2 is a male quick coupler, and the fitting 17 at the end of the hose 16 is a female quick coupler, but this is not limited to this.

[0033] 6, a main inlet valve 18 and a main outlet valve 19 connected to the cooling water supply source 12 are provided in a block body 14. An inlet circuit 20 connecting the main inlet valve 18 and the plurality of on-off valves 15, and an outlet circuit 21 connecting the main outlet valve 19 and the plurality of on-off valves 15 are formed inside the block body 14. The plurality of on-off valves 15 are divided into an inlet on-off valve 15a and an outlet on-off valve 15b.

[0034] The block body 14 is provided with an air supply valve 22 that communicates with the inlet circuit 20 and a drain valve 23 that communicates with the outlet circuit 21. The main inlet valve 18, the main outlet valve 19, the on-off valve 15, the air supply valve 22, and the drain valve 23 are ball valves that are opened and closed by operating a manual handle, but are not limited to this.

[0035] The circuit diagram shown in Fig. 6 is for draining the cooling water remaining in the mold 2. The draining method for the inside of the mold 2 is as follows.

[0036] In this embodiment, the mold 2 is provided with first to fourth cooling water passages 12, and joints 11 are provided at the inlet and outlet of each cooling water passage 12. The valve stand 13 is also provided with eight on-off valves 15, namely, first to fourth inlet on-off valves 15a and first to fourth outlet on-off valves 15b.

[0037] The main inlet valve 18 and the main outlet valve 19 are both closed. The first inlet opening / closing valve 15a and the first outlet opening / closing valve 15b are opened, and the second to fourth inlet / outlet opening / closing valves 15 are all closed. The drain valve 23 is opened, and then the air supply valve 22 is opened to supply compressed air from the inlet circuit 20 to the first cooling water passage 10 of the mold 2, and the remaining water inside is recovered via the drain valve 23 to a tank or the like.

[0038] Once recovery of the first cooling water passage 10 is completed, recovery of the remaining water in the second to fourth cooling water passages 10 is carried out in sequence according to the above procedure.

[0039] Once the remaining water in all the cooling water passages 10 has been collected, all the joints 11 and 17 are released, and the mold 2 is replaced.

[0040] When the couplings 11, 17 are released as shown in Figure 5, the released hoses 16 hang down in a blind pattern at equal intervals and are neatly arranged without tangling. The next time a new mold 2 is brought in, it will be easy to couple the couplings 17 of the inlet and outlet hoses 16 to the inlet and outlet couplings 11 of the mold 2.

[0041] By forming the valve stand 13 from a block body 14, "hose numbers" such as 1st to 4th can be displayed on the surface of the block body 14, preventing incorrect piping. Unused hoses 16 can also be identified on a circuit-by-circuit basis.

[0042] The heat retention of the cooling water is improved because two communication passages 20, 21 for the inlet and outlet are formed in one block body 14. Since the hose 16 is not bent, there are effects such as less flow resistance and no pressure loss.

[0043] 7 to 11 show a first embodiment of the valve stand 13. For ease of understanding, the inlet (IN) circuit is shown separately in FIG. 7, and the outlet (OUT) circuit is shown separately in FIG.

[0044] 7 and 9, (a) and (b) are side views, (c) is a bottom view, and (d) is a side view viewed from the opposite direction. The block body 14 of the valve stand 13 is formed in a rectangular parallelepiped shape. The air supply valve 22 and the inlet opening / closing valve 15a are screwed into the bottom surface of the block body 14. The outlet opening / closing valve 15b is attached to the lower end of a pipe 24 that hangs down from the bottom surface of the block body 14. The air supply valves 22 and the inlet and outlet opening / closing valves 15 are alternately arranged at equal intervals in a straight line. The outlet opening / closing valve 15b is arranged offset downward so as not to interfere with operation of the manual handle of the inlet opening / closing valve 15a.

[0045] By arranging the air supply valve 22 and the inlet and outlet opening / closing valves 15a, 15b in a vertical staggered pattern in this way, the arrangement pitch in a straight line can be narrowed and the overall length of the block body 14 can be shortened, so that the block body 14 can be arranged in the narrow space from the side surfaces of the platens 3, 4 to the safety cover 9.

[0046] The main inlet valve 18, main outlet valve 19, and drain valve 23 are flange-mounted to the bottom surface of the block body 14. These valves 18, 19, and 23 are arranged at equal intervals on a straight line that is different from the arrangement position of the inlet / outlet opening / closing valve 15. By flange-mounting them, the arrangement interval with the opening / closing valve 15 can be narrowed, and the width of the block body 14 can be reduced.

[0047] As shown in FIGS. 8, 10 and 11, the block body 14 is provided with holes for an inlet circuit 20 and an outlet circuit 21.

[0048] 12 to 17 show a second embodiment of the valve stand 13. As shown in FIG. The inlet (IN) circuit is shown separately in Fig. 12, and the outlet (OUT) circuit is shown separately in Fig. 15. Fig. 12(a) and (b) are side views, and Fig. 12(c) is a bottom view, and Fig. 15(a) is a plan view, Fig. 15(b) is a side view, and Fig. 15(c) is a bottom view.

[0049] The arrangement of the air supply valve 22 and the inlet / outlet opening / closing valve 15 is the same as in the first embodiment. The main inlet valve 18 is flange-mounted to the bottom surface of the block body 14 at a position different from the inlet / outlet opening / closing valve 15.

[0050] The main outlet valve 19 and the drain valve 23 are different from those in the first embodiment in that they are flange-mounted to the side surface of the block body 14 .

[0051] 18 to 23 show a third embodiment of the valve stand 13. As shown in FIG.

[0052] In this third embodiment, the main inlet valve 18, main outlet valve 19, and drain valve 23 are provided on the side of the block body 14, and the air supply valve 22 and the inlet / outlet opening / closing valve 15 are provided on the bottom surface of the block body 14. The other configurations are almost the same as those of the previous embodiments.

[0053] The fourth embodiment is shown in FIGS. 25 to 32.

[0054] In the first to third embodiments, the valve stand 13 was fixedly attached to the platens 3, 4, so there was a problem that the valve stand 13 could not be inserted and could not be attached when the distance from the platens 3, 4 to the safety cover 9 was short. The fourth embodiment solves this problem.

[0055] As shown in Figure 31, an arm 25 is attached to the fixed platen 3 so as to protrude from its side toward the safety cover 9. As shown in Figure 26, a vertically oriented shaft 26 is fixed to this arm 25 so as to protrude upward. The block body 14 of the valve stand 13 is attached to this shaft 26 so as to be rotatable about the vertical axis. A locking mechanism 27 is provided between the block body 14 and the shaft 26 to restrict the rotation angle of the block body 14.

[0056] 29 and 30, the locking mechanism 27 locks the block body 14 to the shaft 26 at rotational positions of 0, 45, and 90 degrees. That is, recesses 28 are formed on the circumferential surface of the shaft 26 at positions of 0, 45, and 90 degrees, and a ball 29 that engages with the recess 28 is provided on the block body 14. The ball 29 is biased toward the recess 28 by an elastic member 30. With this locking mechanism 27, the valve stand 13 is fixed to the side surface of the platen 3 at rotational positions of 0, 45, and 90 degrees.

[0057] The valve stand 13 has the same configuration as those in the first to third embodiments, and is provided with an on-off valve 15, a main inlet valve 18, a main outlet valve 19, an air supply valve 22, a drain valve 23, and the like.

[0058] 31 and 32 show how to use the valve stand 13. In Fig. 31, the safety door 19a of the safety cover 19 is open, and the block body 14 is locked at the 0 degree position. The tip of the block body 14 protrudes laterally beyond the safety cover 19. In this state, the joint 17 of the hose 16 is connected to the joint 11 of the mold 2. Also, the opening and closing operation of the on-off valve 15 is performed.

[0059] 32, the block body 14 is folded at a 45-degree or 90-degree angle, and the main inlet valve 18, the main outlet valve 19, the air supply valve 23, or the drain valve 23 is opened or closed. After that, the safety door 19a is closed, and molding is performed in the injection molding machine.

[0060] The locking mechanism 27 is not limited to the engagement between the recess 28 and the ball 29, but may be any mechanism capable of locking the block body 14 in a predetermined rotational position. Also, although the arm 25 attached to the platen 3 has been exemplified, it may also be possible to provide a stand directly on the ground and to mount the block body on this stand in a rotatable manner.

[0061] The present invention is not limited to the embodiments and examples. For example, the block body 14 is not limited to a rectangular parallelepiped. Also, although the inlet circuit 20 and the outlet circuit 21 are formed in the block body 14, the inlet circuit 20 and the outlet circuit 21 may be formed as separate pipes or the like.

[0062] The scope of the present invention is defined by the claims, not by the above description, and includes all modifications within the meaning and scope of the claims.

[0063] In injection molding machines, resin is melted at a temperature of 200-400°C and poured into a mold, where the mold temperature is adjusted to harden the resin. The mold temperature is regulated using water (up to 100°C) or oil (100°C or higher) heated by a temperature controller. This is because room-temperature water or chilled water (cooling water) is too low in temperature, causing the resin to harden and clog the mold when poured into it. Therefore, the term "cooling water" used in the claims and the specification includes temperature-controlled water heated by a temperature controller. In other words, the "cooling system" of the present invention includes a "temperature control system." [Explanation of symbols]

[0064] 1 injection molding machine 2. Mold 2a fixed mold 2b Movable mold 3 Fixed platen 4 Movable platen 5 guide rod 6 Movable platen drive mechanism 7 Injection tube 8 Injection mechanism 9 Safety Cover 10 Cooling water passage 11 Joint (mold side) 12 Cooling water supply source (temperature controller) 13 Valve stand 14 Block Letters 15 Opening and closing valve 15a Inlet opening / closing valve 15b Outlet opening and closing valve 16 Hose 17 Joint (hose side) 18 Main inlet valve 19 Main Outlet Valve 20 Inlet circuit 21 Exit circuit 22 Air supply valve 23 Drain valve 24 Pipe 25 Arm 26 axes 27 Locking mechanism 28 Recess 29 balls 30 Elastic member

Claims

1. In a mold cooling system for an injection molding machine, cooling water is supplied from a cooling water supply source through a valve stand to a plurality of cooling water passages of a mold attached to a platen, the valve stand has an inlet circuit having a main inlet valve and an outlet circuit having a main outlet valve, the inlet circuit and the outlet circuit protruding from a side surface of the platen toward a safety cover of the injection molding machine; the main inlet valve and the main outlet valve are connected to the cooling water source; a plurality of on-off valves are provided in the inlet circuit and the outlet circuit at predetermined intervals in the protruding direction, and hoses connected to the on-off valves hang down in a reed pattern; The mold cooling system of the injection molding machine has a coupling at the end of the hose that is connected to the cooling water passage.

2. The inlet circuit and the outlet circuit are formed in a block provided on a side surface of the platen, A communication passage is formed in the block body, the communication passage being in communication with the on-off valve, the main inlet valve, and the main outlet valve.

2. The mold cooling system for an injection molding machine according to claim 1, wherein an air supply valve is connected to the inlet circuit, and a drain valve is connected to the outlet circuit.

3. 3. The mold cooling system of claim 2, wherein the main inlet valve, main outlet valve, air supply valve, and drain valve are provided on the underside of the block body, and the air supply valve and the plurality of on-off valves are arranged in a straight line with a difference in height.

4. 3. The mold cooling system for an injection molding machine according to claim 2, wherein the main inlet valve and the air supply valve are provided on the underside of the block body, the main outlet valve and the drain valve are provided on the side of the block body, and the air supply valve and the plurality of on-off valves are arranged in a straight line with a difference in height.

5. 3. The mold cooling system of claim 2, wherein the air supply valve is provided on the underside of a block body, the main inlet valve, the main outlet valve, and the drain valve are provided on the side of the block body, and the air supply valve and the plurality of on-off valves are arranged in a straight line with a difference in height.

6. the inlet circuit and the outlet circuit are formed in a block body that is provided so as to be movable relative to a side surface of the platen; A communication passage is formed in the block body, the communication passage being in communication with the on-off valve, the main inlet valve, and the main outlet valve.

2. The mold cooling system for an injection molding machine according to claim 1, wherein an air supply valve is connected to the inlet circuit, and a drain valve is connected to the outlet circuit.

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