JP7221066B2 - Cooling device for injection molding machine and molded product take-out system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an injection molding machine and a molded product take-out system.

For example, there is an injection molding system that molds a large number of preforms, which are intermediate products of PET bottles, at one time. Such an injection molding system is equipped with a take-out machine that takes out the molded product from the mold, and a cooling machine that blows air onto a large number of taken-out molded products to cool the molded products (see Patent Document 1).

JP 2016-190475 A

When the chiller blows air to cool the molded product, dehumidified air is used to prevent condensation. However, the total amount of air blown out from the cooler is large, and if all the air is generated from the dehumidifier, a large-sized, high-capacity dehumidifier is required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cooling device for an injection molding machine capable of reducing the dehumidified air generation capacity required of a device that generates dehumidified air, and a molded product ejection system equipped with such a cooling device. .

A cooling device for an injection molding machine according to the present invention includes:
A cooling device for an injection molding machine that blows air onto a molded article taken out by a takeout machine,
a dehumidified air generator that generates dehumidified air;
a first duct for passing air from the dehumidified air generator to a cooler for the molded product;
an inlet for introducing the air in the cover covering at least the space in which the mold is arranged from the middle of the first duct;
Prepare.

A molded product take-out system according to the present invention includes:
A take-out machine for taking out a molded product molded by an injection molding machine from a mold, a cooling device for blowing air onto the taken-out molded product, and an air supply device for supplying air to the cooling device,
The air supply device is
a dehumidified air generator that generates dehumidified air;
a first duct for sending air from the dehumidified air generator to the cooler;
an inlet for introducing the air in the cover covering at least the space where the mold is arranged from the middle of the first duct;
including.

ADVANTAGE OF THE INVENTION According to this invention, there exists an effect that reduction of the generation capability of the dehumidified air requested|required of the dehumidified air generation part can be aimed at.

1 is a plan view showing an injection molding system according to an embodiment of the invention; FIG. 2 is a side view of the injection molding system of FIG. 1; FIG. FIG. 4 is a view showing part of the take-out plate and cooling device of the take-out machine;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing an injection molding system according to an embodiment of the invention. 2 is a side view of the injection molding system of FIG. 1; FIG. FIG. 3 is a view showing part of the unloading plate and cooling device of the unloader.

The injection molding system 1 according to the embodiment of the present invention molds a large number of preforms, which are intermediate products of PET bottles, for example, as molded products F (FIG. 3) at one time. The injection molding system 1 includes an injection molding machine 10 that injects a molding material into a cavity of a mold 20, a takeout machine 30 that takes out a molded product F from the mold 20, and air to the molded product F taken out by the takeout machine 30. A blowing cooler 40 is provided. Furthermore, the injection molding system 1 supplies dehumidified air to a receiver 50 that receives the cooled molded product F from the takeout machine 30 and puts the molded product F into a carry-out section where a conveyor or the like is arranged, and to the cooler 40. It has an air supply device 60 and a cover 7 that covers the moving parts of the system. In FIG. 1, a part of the cover 7 is shown in a broken cross section excluding the ceiling surface, but the cover 7 also covers the upper part of the movable part. The air supply device 60 corresponds to an example of the injection molding machine cooling device according to the present invention. A configuration including the extractor 30, the cooler 40, and the air supply device 60 corresponds to an example of the molded article extracting system according to the present invention.

A mold 20 incorporated in the injection molding system 1 is provided with a large number of cavities in order to mold a large number of molded products F at one time. The mold 20 includes a fixed mold 21 and a movable mold 22, and a large number of cavities are arranged in multiple rows and columns on the side where the fixed mold 21 and the movable mold 22 face each other. The movable mold 22 reciprocates from a position in contact with the fixed mold 21 to a position away from the fixed mold 21 . With the movable mold 22 and the fixed mold 21 separated from each other, the extraction plate 31 can be inserted between them. A space in which the mold 20 is arranged is referred to as a molding space V1. Note that the mold 20 may be divided for each cavity.

The injection molding machine 10 includes an injection device 11 that melts and injects a molding material, a plasticization movement device that moves the injection device 11 and presses the injection port against a fixed mold 21, and a movable mold 22 that moves. A mold clamping device 13 for opening/closing and clamping the mold 20 and an ejector device for ejecting the molded product F solidified in the cavity of the mold 20 from the movable mold 22 are provided.

The takeout machine 30 takes out the molded article F from the movable mold 22 and conveys it to the receiving space V3 where the cooler 40 and the receiving machine 50 operate. Specifically, the unloader 30 has an unloading plate 31 provided with a plurality of cylinders 32, as shown in FIG. The cylindrical body 32 is provided with an accommodating portion 32a that conforms to the outer shape of the molded product F, a flow path 32b through which cooling water flows, and a suction port 32c through which the molded product F is sucked. The cylindrical body 32 sucks the molded article F into the housing portion 32a and cools the molded article F from the outside. The take-out plate 31 is provided with cylinders 32 that are integral multiples (for example, four times) of the plurality of cavities provided in the mold 20 . Thereby, the extraction plate 31 can hold a plurality of sets (for example, 4 sets) of a plurality of molded products F that are molded at once by the mold 20 . The ejector 30 further moves the ejector plate 31 along the rails 35 that move the ejector plate 31 from the position facing the movable mold 22 to the position facing the cooler 40 and the receiver 50 . and a drive. A space in which the extraction plate 31 moves is referred to as a delivery space V2.

The cooling device 40 includes a plurality of pipes 41 for blowing air, a holding plate 42 for holding the plurality of pipes 41, and the extraction plate 31 in a state in which the extraction plate 31 is arranged facing each other. ), and a driving portion for moving the holding plate 42 forward and backward. Dehumidified air is sent from the air supply device 60 to the plurality of pipes 41 through the supply port 43 . The pipe 41 is inserted inside the molded product F, and dehumidified air is blown from the pipe 41 to cool the molded product F from the inside. The holding plate 42 is provided with a number of pipes 41 several times (for example, three times) the number of molds provided in the mold 20 . Thereby, the cooler 40 can cool a plurality of sets (for example, 3 sets) of a plurality of molded products F that are molded at once by the mold 20 at once. The holding plate 42 is provided with a plurality of through-holes 42B through which one set of molded articles F out of a plurality of sets of molded articles F held by the unloader 30 can pass.

As shown in FIGS. 1 and 2, the receiver 50 includes a cylinder 51 that receives the molded article F held by the takeout machine 30 by, for example, suction, a holding plate 52 that holds the cylinder 51, and a takeout plate 31. and a drive unit for advancing and retreating the holding plate 52 toward the extracting plate 31 (indicated by arrows in FIGS. 1 and 2) in a state of facing each other. The holding plate 52 is provided with a plurality of cylindrical bodies 51 that are the same in number as the plurality of molded products F that are formed at once by the mold 20 . A plurality of cylinders 51 can receive the molded product F from the unloader 30 via the through holes 42B (FIG. 3) of the holding plate 42 of the cooler 40. As shown in FIG. The drive unit of the receiver 50 has, in addition to the forward/backward drive described above, a mechanism for rotating the holding plate 52 by 90 degrees so that the cylinder 51 faces downward. The receiver 50 drops the plurality of molded products F to the carry-out section below by releasing the suction of the plurality of molded products F with the plurality of cylindrical bodies 51 facing downward. For example, a conveyer is provided in the unloading section, and a plurality of molded products F are unloaded to the outside by the conveyor. A space in which the cooler 40 and the receiver 50 operate is referred to as a receiver space V3.

If the cycle in which the injection molding machine 10 injects the molding material into the mold 20 and molds one set of molded products F at one time is defined as one cycle, the molded product F molded in the first cycle is the fourth cycle. After being taken out by the take-out machine 30, the molded product F molded in the cycle is received by the receiving machine 50. - 特許庁A take-out plate 31 of the take-out machine 30 reciprocates between the molding space V1 and the receiving space V3 for each cycle. The molded article F molded in the first cycle is cooled by the cooler 40 during molding of the molded article F molded in the second, third and fourth cycles. When the molded product F molded in the fourth cycle is taken out by the takeout machine 30, the molded product F molded in the first cycle is received by the receiver 50. FIG. Delivery of the molded article F molded in the first cycle to the receiver 50 is performed during molding in the fifth cycle. The molded product F molded in the fifth cycle is taken out of the take-out positions of the take-out machine 30 at the position where the molded product F molded in the first cycle was accommodated. That is, while the molded product F is not molded, the take-out machine 30 takes out the molded product F, and during the molding of the molded product F, the molded product F molded in the previous cycle is cooled and transferred to the receiver 50. will be The term "non-molding" means the period from the completion of molding of the molded product F in one cycle to the start of molding of the molded product F in the next cycle. The molded product F delivered to the receiver 50 is then sent to the carry-out section, and one set of molded products F is manufactured for each cycle.

In this embodiment, the cooler 40 and the receiver 50 are provided separately, and the receiver 50 receives the molded product F and moves the molded product F to the unloading unit. Other moldings F that are being held can be cooled. As a result, it is possible to improve the cooling efficiency and shorten the molding cycle. Further, the cooler 40 may be provided on a movable platen that supports the movable mold 22 and configured to cool the molded product F when the mold 20 is closed.

The cover 7 covers at least the molding space V1 in which the mold 20 is arranged, the delivery space V2 in which the ejection plate 31 transports the molded product F, and the receiving space V3 in which the cooler 40 and the receiver 50 operate. . The molding space V1, the delivery space V2, and the receiving space V3 are not divided by a partition or the like, and are connected so that air can move. The cover 7 may not be configured to completely seal the inside from the outside, and may be configured to prevent the external air from easily mixing with the internal air. Note that the cover 7 only needs to cover at least the molding space V1. In order to prevent dew condensation on the mold 20, the atmosphere around the mold 20 is controlled to have a low humidity atmosphere.

A part of the cover 7 is provided with an unloading window 71 through which the unloading plate 31 can be unloaded and loaded. The unloading window 71 is provided, for example, on the ceiling surface of the cover 7 above a partial range of the delivery space V2. The carry-out window 71 is closed during normal operation of the injection molding system 1 and opened when the take-out plate 31 is replaced according to the shape of the molded product F.

The air supply device 60 includes a dehumidified air generator 63 that generates dehumidified air, first ducts 61 (61a, 61b, 61c) that send the dehumidified air generated by the dehumidified air generator 63 to the cooler 40, and dehumidified air A second duct 62 for sending the dehumidified air generated by the generator 63 to the molding space V1, a junction box 64 having an introduction port 64b capable of introducing the air in the cover 7 in the middle of the first duct 61, and the first duct. It has fans 65a and 65b for flowing the air 61 and an adjustment valve 67 for adjusting the flow rate of the air.

The dehumidified air generator 63 is, for example, a dehumidifier, generates a predetermined amount of dehumidified air, sends out part of it from the first duct 61 and the rest from the second duct 62 .

The first duct 61 includes an upstream pipe 61 c for flowing dehumidified air from the dehumidified air generator 63 to the junction box 64 and downstream pipes 61 a and 61 b for flowing air from the junction box 64 to the cooler 40 . Although not particularly limited, the first duct 61 is branched into two by a junction box 64, and the junction box 64 is connected to two downstream pipes 61a and 61b.

The fans 65 a and 65 b are provided in the middle of the downstream pipes 61 a and 61 b and pump dehumidified air to the cooler 40 . By branching the first duct 61 into two and providing fans 65a and 65b in both of the branched downstream pipes 61a and 61b, the pressure of the air supplied to the many pipes 41 of the cooler 40 is made uniform. can be made The first duct 61 may be branched into three or more, and a fan may be provided in each downstream pipe.

The junction box 64 is arranged at a portion of the ceiling covering the delivery space V2 of the cover 7 except for the unloading window 71 . An introduction port 64b is provided in the lower portion of the junction box 64, and the inside of the junction box 64 and the inside of the cover 7 are communicated through the introduction port 64b. The introduction port 64b may be provided with a filter for removing dust and the like from the air passing therethrough.

The regulating valve 67 is provided at a connecting portion between the upstream pipe 61c of the first duct 61 and the junction box 64, and can change the degree of opening of the upstream pipe 61c. A change in the degree of opening changes the flow rate of the air flowing through the upstream pipe 61c. The adjustment valve 67 can be composed of, for example, a partition plate that slides to change the opening of the flow path, or a flap plate that rotates to change the opening of the flow path.

According to the air supply device 60 configured as described above, part of the dehumidified air generated by the dehumidified air generator 63 is sent to the molding space V1 through the second duct 62, and the remaining part is sent to the first It is sent to cooler 40 via duct 61 .

In the first duct 61, the amount of air required by the cooler 40 is flowed by pressure-feeding by the fans 65a and 65b. As a result, a predetermined flow rate of dehumidified air is blown out from the plurality of pipes 41 of the cooler 40 . The total amount of this dehumidified air is greater than the air sent from the air supply device 60 to the first duct 61 , and the difference between them is introduced from inside the cover 7 via the inlet 64 b of the junction box 64 . In the transfer space V2 in the cover 7, the dehumidified air sent to the molding space V1 through the second duct 62 and the dehumidified air blown out from the cooler 40 are discharged through an air outlet (for example, the cover 7 and the floor). gap between surfaces). Therefore, the air introduced into the junction box 64 from the inside of the cover 7 through the inlet 64b also maintains low humidity. By limiting the position of the air outlet, the dehumidified air may be controlled so as to flow to the inlet 64b. The introduction port 64b of the junction box 64 is arranged on the opposite side of the molding space V1 in which the mold 20 which becomes hot is arranged, with the transfer space V2 in which the water-cooled extraction plate 31 reciprocates interposed therebetween. Thereby, relatively low-temperature dehumidified air can be introduced from the introduction port 64b. Therefore, the air mixed with these is sent to the cooler 40 via the first duct 61 and used to cool the molded product F. As shown in FIG. The mixed air keeps low humidity and is relatively low temperature. Therefore, by blowing dehumidified air from the cooler 40, the molded product F is sufficiently cooled while suppressing the occurrence of dew condensation. can be done.

In addition, downstream of the fans 65a and 65b of the first duct 61, the flow path is branched, and one of the branched flow paths is connected to the opening of the cover 7 to supply the dehumidified air to the delivery space V2 or the receiving space V3. A feeding arrangement may be employed.

If there is a request for adjustment of the amount of dehumidified air supplied to the molding space V1, the adjustment valve 67 of the junction box 64 can handle it. By changing the opening degree of the upstream pipe 61 c of the first duct 61 with the adjustment valve 67 , the flow rate of the dehumidified air generated by the dehumidified air generation unit 63 that is sent to the second duct 62 and the flow rate that is sent to the first duct 61 The flow rate sent to the second duct 62 can be varied by changing the ratio of the flow rate to the flow delivered. Even if the flow rate of the dehumidified air sent from the dehumidified air generator 63 to the first duct 61 decreases, the amount of air introduced from the inlet 64b increases due to the action of the fans 65a and 65b. A decrease in the total amount of dehumidified air supplied is suppressed.

As described above, according to the injection molding system 1 and the air supply device 60 of the present embodiment, at least the molding space V1 is covered in the middle of the first duct 61 through which the dehumidified air flows from the dehumidified air generator 63 to the cooler 40. An introduction port 64b for introducing air from inside the cover 7 is provided. Therefore, it is not necessary for the air supply device 60 to supply all the flow rate of dehumidified air required by the cooler 40 , and part of the required flow rate of dehumidified air can be supplemented from within the cover 7 . As a result, the dehumidified air generation capacity of the dehumidified air generation unit 63 can be reduced compared to the configuration in which the air supply device 60 supplies all the flow rate of the dehumidified air required by the cooler 40, and the dehumidified air generation unit 63 Miniaturization and cost reduction can be achieved.

Furthermore, according to the injection molding system 1 and the air supply device 60 of the present embodiment, the fans 65a and 65b are arranged downstream (cooler 40 side) of the introduction port 64b of the first duct 61 . As a result, when the dehumidified air supplied from the air supply device 60 is less than the flow rate of the dehumidified air required by the cooler 40, the dehumidified air corresponding to the difference can be introduced from the inlet 64b. Therefore, the air supply device 60 can supply dehumidified air at a required flow rate to the cooler 40 .

Furthermore, according to the injection molding system 1 and the air supply device 60 of the present embodiment, the second duct 62 that sends the dehumidified air from the dehumidified air generator 63 to the molding space V1 is provided. Thereby, the molding space V1 can be maintained at low humidity, and the low humidity of the air introduced into the first duct 61 from the introduction port 64b can be ensured.

Furthermore, according to the injection molding system 1 and the air supply device 60 of the present embodiment, the adjustment valve 67 is provided upstream of the introduction port 64b of the first duct 61 . Therefore, the ratio of the dehumidified air supplied from the dehumidified air generator 63 to the molding space V1 through the second duct 62 can be adjusted by adjusting the adjustment valve 67 .

Furthermore, according to the injection molding system 1 of the present embodiment, the introduction port 64 b of the first duct 61 is arranged at a portion of the cover 7 excluding the carry-out window 71 of the ejection plate 31 . This eliminates the need to remove the introduction port 64b of the first duct 61 when replacing the ejector plate 31, and the efficient replacement work of the ejector plate 31 can be realized.

The embodiments of the present invention have been described above. However, the invention is not limited to the above embodiments. For example, in the above-described embodiment, the configuration in which the inlet of the first duct and the regulating valve are provided in one junction box 64 has been described as an example. It may be provided directly in the first duct. A configuration may also be employed in which a branch duct is provided between the inlet and the cover, and the air in the cover is sent to the inlet of the first duct via the branch duct. Further, in the above embodiment, the cooling device and the receiving device are configured separately, but the cooling device and the receiving device may be integrated. Further, a configuration may be applied in which the molded article is carried out by removing the molded article by the take-out machine after cooling the molded article by the cooling device without the receiving device. Other details shown in the embodiments can be changed as appropriate without departing from the scope of the invention.

1 Injection Molding System 7 Cover 10 Injection Molding Machine 20 Mold 21 Fixed Mold 22 Movable Mold 30 Unloader 31 Extractor Plate 32 Cylinder 35 Rail 40 Cooler 41 Pipe 42 Holding Plate 50 Receiver 51 Cylinder 52 Holding Plate 60 Air supply device 61 First duct 62 Second duct 63 Dehumidified air generator 64 Junction box 64b Inlet 65a, 65b Fan 67 Regulating valve 71 Unloading window V1 Molding space V2 Delivery space V3 Receiving space

Claims (6)

A cooling device for an injection molding machine that blows air onto a molded article taken out by a takeout machine,
a dehumidified air generator that generates dehumidified air;
a first duct for passing air from the dehumidified air generator to a cooler for the molded product;
an inlet for introducing the air in the cover covering at least the space in which the mold is arranged from the middle of the first duct;
A cooling device for an injection molding machine. further comprising a fan for sending air in the first duct toward the cooler;
The fan is arranged at a portion closer to the cooler than the introduction port in the first duct,
A cooling device for an injection molding machine according to claim 1. Further comprising a second duct for sending air from the dehumidified air generator to a molding space in which the mold is arranged,
A cooling device for an injection molding machine according to claim 1 or 2. Further equipped with an adjustment valve that adjusts the air flow rate,
The regulating valve is arranged between the inlet and the dehumidified air generator in the first duct,
A cooling device for an injection molding machine according to claim 3. A take-out machine for taking out a molded product molded by an injection molding machine from a mold, a cooling device for blowing air onto the taken-out molded product, and an air supply device for supplying air to the cooling device,
The air supply device is
a dehumidified air generator that generates dehumidified air;
a first duct for sending air from the dehumidified air generator to the cooler;
an inlet for introducing the air in the cover covering at least the space where the mold is arranged from the middle of the first duct;
Part take-out system including. The introduction port is arranged at a portion excluding the carry-out window of the cover through which the take-out plate of the take-out machine can be carried in and out.
6. The molded article take-out system of claim 5.

Images