JP2020163835A - Actuator for mounting on injection molding machine, actuator cooling device, injection molding machine, and method for using actuator cooling device - Google Patents

Abstract

To provide an actuator for mounting on an injection molding machine, which can easily provide a flow path for a coolant with excellent maintainability, an actuator cooling device, an injection molding machine, and a method for using the actuator cooling device.SOLUTION: There is provided an actuator for mounting on an injection molding machine, which is an actuator 1 mounted on the injection molding machine, and which comprises an actuator case 2 constituting an exterior of the actuator 1 and having an outer surface Se provided with a flow path through which a coolant flows, in which the actuator case 2 has a recessed portion 7 and/or protrusion portion for the flow path provided as a part of the outer surface Se on the outer surface Se of the actuator case 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cooling technique for an actuator mounted on an injection molding machine.

An injection molding machine may be used in high-cycle molding in which a series of steps from melting a molding material such as a resin material and injecting it into a mold to obtain a molded product is repeated in a relatively short cycle. .. In particular, under such usage conditions, electric motors and other actuators such as weighing motors, injection motors, and mold clamping motors mounted on injection molding machines may generate a large amount of heat and the temperature may rise significantly.

On the other hand, in the actuator of the injection molding machine described above, heat generated during use is generally generated by air cooling by a fan or the like arranged in the vicinity or liquid cooling by a coolant such as water flowing in the vicinity of the actuator case on the exterior thereof. We are trying to dissipate.

Among these, as a technique related to liquid cooling of an actuator, for example, there are those described in Patent Documents 1 to 4.
Patent Document 1 states, "In an electric injection molding machine (1) that operates each process using an electric motor as a drive source, an injection motor (2), a plasticization motor (3), a mold opening / closing motor (4), and an eject motor (5). Disclosed is an electric injection molding machine for clean room molding, wherein each servo motor is a water-cooled servo motor that suppresses motor heat generation by the cooling water of the cooling water pipe (6). Here, "the cooling water from the cooling water pipe 6 is flowed through the jackets arranged on the outer periphery of each of the water-cooled servomotors of the injection motor 2, the plasticization motor 3, the mold opening / closing motor 4, and the eject motor 5 to flow inside the motor. It removes more heat. "

Patent Document 2 includes "(a) a driving unit, (b) a load device that is operated by driving the driving unit, and (c) a cooling unit that cools the driving unit, and (d). ) The cooling unit is provided with a cooling medium supply port on the load side connected to the load device in the drive unit and a cooling medium discharge port on the non-load side not connected to the load device. "Device" is described. More specifically, as shown in FIG. 1 of Patent Document 2, regarding this "cooling device", "the heat generated by driving the motor 71 is dissipated to cool the motor 71. In order to do so, a jacket 51 as a cooling unit is attached to the outer periphery of the drive unit case 72. "

In Patent Document 3, "(a) a driving unit, (b) a cooling unit for cooling the driving unit, (c) a first tank accommodating a cooling medium, and (d) communicating with the first tank. A second tank for accommodating the cooling medium, (e) a pump that sucks the cooling medium in the first tank and supplies it to the cooling unit, and (f) cooling discharged from the cooling unit. A "cooling device for a drive unit" is described, which comprises a heat exchanger that cools the medium and returns it to the second tank. In Patent Document 3, "a jacket 51 as a cooling unit is provided on the outer periphery of the drive unit case 24 in order to dissipate heat generated by driving the motor 11 and cool the motor 11. It can be installed. "

Patent Document 4 states that "(a) an injection device using an AC servomotor as a drive source, (b) a cover that surrounds the injection device, and (c) a pipe through which a cooling fluid flows are provided. , And (d) an electric injection molding machine characterized in that heat radiation fins are provided on the outside. ”

Although not related to an actuator of an injection molding machine, Patent Documents 5 to 7 describe techniques related to liquid cooling of a motor or the like.
Patent Document 5 describes "a water-cooled canned motor having a structure in which water is passed through a water-cooled jacket provided on the outer periphery of the motor frame to cool the motor". Patent Document 6 states, "Providing a rotary electric machine such as a water-cooled electric motor that is easy to assemble, has a compact outer diameter, does not have to worry about water leakage, and has good cooling performance." A spirally formed copper or stainless steel pipe 2 is cast inside the frame 1 and a cooling medium is circulated through the pipe 2. ”is described. In the "water-cooled motor structure" described in Patent Document 7, "the motor case 1 is made of a casting, and one cooling pipe 2 spirally wound is embedded in the wall 1a thereof. It is. "

Jitsufuku No. 6-1392 Japanese Unexamined Patent Publication No. 2004-23816 Japanese Unexamined Patent Publication No. 2004-32867 Square root extraction No. 3-59820 JP-A-10-52002 Square root extraction No. 6-44378 Square root extraction No. 3-91053

In the actuator mounted on the injection molding machine, a hole-shaped cooling liquid flow path is formed inside the peripheral wall constituting the actuator case by bending hole processing or other processing, or becomes a flow path for the cooling liquid to flow. The pipe-shaped member may be embedded and arranged by casting the pipe-shaped member.

However, in this case, since the flow path is formed inside the peripheral wall of the actuator case, when the flow path is clogged or corroded, it is necessary to replace not only the flow path but also the actuator as a whole. .. In addition, when processing the inside of the peripheral wall of the actuator case, it is difficult to form a continuous hole-shaped flow path in the actuator case of the actuator having a relatively long total length.

Further, as the liquid-cooled jacket arranged on the outer peripheral side of the actuator case as described in Patent Documents 1 to 3, it is necessary to prepare a liquid-cooled jacket corresponding to the actuator in which the liquid-cooled jacket is used. Man-hours are required to manufacture a liquid-cooled jacket.
Patent Document 4 teaches that a pipe for flowing a cooling fluid is provided around an AC servomotor in an injection device cover arranged at a predetermined distance from the AC servomotor. In the liquid cooling of the injection device cover, it is undeniable that the presence of an air layer between the injection device cover increases the thermal resistance and the AC servo motor may be insufficiently cooled.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide an actuator or an actuator for mounting an injection molding machine, which is excellent in maintainability and can easily provide a flow path for a coolant. It is an object of the present invention to provide a method of using a cooling device, an injection molding machine, and an actuator cooling device.

One actuator for mounting on an injection molding machine that can solve the above problems is mounted on an injection molding machine, constitutes the exterior of the actuator, and is provided with a flow path for flowing a coolant on the outer surface. The actuator case is provided with a flow path concave portion and / or a convex portion provided as a part of the outer surface on the outer surface of the actuator case.

According to the above-mentioned actuator for mounting on an injection molding machine, by providing a recess and / or a convex portion for a flow path as a part of the outer surface on the outer surface of the actuator case, it is excellent in maintainability and the coolant The flow path can be easily provided.

It is a perspective view which shows the actuator of one Embodiment of this invention together with the tubular flow path member which can be attached to the outer surface of the actuator case. It is a schematic vertical sectional view along the line II-II of FIG. It is a perspective view which shows the actuator of FIG. 1 in the state which attached the tubular flow path member to the outer surface of the actuator case. It is a side view of the actuator shown in FIG. It is a perspective view which shows the actuator of FIG. 1 together with a tubular flow path member and a cover plate which can be attached to the outer surface of an actuator case. It is a perspective view which shows the actuator of another embodiment in the state before and after mounting of a tubular flow path member. It is a perspective view which shows the actuator of still another embodiment in the state before and after mounting a tubular flow path member. It is a perspective view which shows the actuator of still another embodiment together with the lid-like flow path member which can be attached to the outer surface of an actuator case. It is a perspective view which shows the actuator of still another embodiment. 9 is a perspective view showing the actuator of FIG. 9 with the cover plate and the cover member on the outer surface removed. It is a front view of the actuator of FIG. It is a side view of the actuator of FIG. It is a schematic diagram which shows the cooling apparatus of one Embodiment of this invention. It is a graph which shows an example of the control of the coolant temperature which can be performed using the cooling apparatus of FIG. It is sectional drawing which shows an example of the injection apparatus of an injection molding machine which can mount an actuator. FIG. 5 is a schematic cross-sectional view showing an example of an injection device including the actuator of FIG.

Embodiments of the present invention will be described in detail below with reference to the drawings.
(Actuator)
As shown in FIG. 1, FIG. 1 shows an actuator mounted on an injection molding machine, and FIG. 2 shows an actuator case constituting the exterior of the actuator 1.

As an example, the illustrated actuator 1 has an output shaft 3a, a rotor 3 as a rotor provided around the output shaft 3a, and an outer circumference of the rotor 3, as shown in a vertical sectional view along the rotation axis direction in FIG. It is an AC servomotor or other electric motor including a stator 4 as a stator including a coil arranged on the side and a stator frame 5 provided with the stator 4 attached to the inner surface Si.

The actuator case 2 includes a tubular stator frame 5 having a rectangular or other polygonal or circular contour shape in the cross section, and a flange 6 that closes the openings at each end of the stator frame 5 in the direction of the rotation axis. It is a housing including. Here, the outer surface Se of the actuator case 2 corresponds to the outer surface facing the outer peripheral side of the stator frame 5. In the illustrated example, the stator frame 5 has a substantially square tubular shape as a whole, and four corners in the circumferential direction are cut out, and a square columnar recess is formed therein. A portion 5a is provided. Correspondingly, recesses 6c having a shape corresponding to the recesses 5a are also formed at the four corners of one of the flanges 6. The other flange 6 is not formed with such a recess, but is provided with through holes 6d at the four corners. As shown in FIG. 2, the hole portion 6a provided in the center of each flange 6 is arranged so as to penetrate the output shaft 3a, and the output shaft 3a is held by the bearing 6b installed in the hole portion 6a. Has been done.

However, although not shown, the present invention can also be applied to various actuators such as hydraulic cylinders, and is particularly effective for actuators that can generate a large amount of heat during use. When the actuator 1 is an electric motor, the actuator 1 is molded into a measuring motor and a mold device that drives a screw rotating operation of melting a molding material such as a resin material in the cylinder and sending it to the tip of the cylinder. To change or adjust the injection motor that drives the advance / retreat operation of the screw when filling materials, the mold clamping motor that drives the mold clamping / mold opening operation of the mold device, or the mold clamping force of the mold device. It can be various motors mounted on an injection molding machine such as a mold thickness adjusting motor.

By the way, such an actuator may generate a large amount of heat depending on the usage mode such as high cycle molding in which a series of injection molding steps is repeated in a short cycle by an injection molding machine.
In order to cool the actuator in order to suppress the temperature rise due to heat generation during use, the actuator case is generally provided with a flow path through which a cooling liquid such as water or oil flows.

Here, conventionally, the peripheral wall constituting the actuator case is processed to form a hole-shaped flow path inside the peripheral wall, or when the actuator case is cast, a pipe-shaped member to be used as the flow path is cast. A flow path was provided in the actuator case by wrapping it and embedding a pipe-shaped member in the peripheral wall of the actuator case.
When the flow path is embedded in the peripheral wall of the actuator case in this way, there are problems with the flow path such as impurities in industrial water that can be used as a coolant and the flow path being clogged with rust due to corrosion. At that time, it is necessary to replace the entire actuator.

On the other hand, in the embodiment shown in FIG. 1, a recess 7 for a flow path, which is a part of the outer surface Se and is recessed from the outer surface Se, is provided on the outer surface Se of the actuator case 2. As shown in FIGS. 3 and 4, a tubular flow path member 51 that serves as a flow path is attached to the flow path recess 7. In the illustrated example, each of the four main outer surface Se of the actuator case 2 is provided with a flow path recess 7 and a tubular flow path member 51 having substantially the same configuration.

According to this, when a problem such as clogging occurs in the flow path of the tubular flow path member 51, the tubular flow path member 51 is removed from the outer surface Se of the actuator case 2, and the tubular flow path member 51 is removed. It is possible to easily eliminate the defect of the member 51 or replace it with a new tubular flow path member 51. Therefore, the actuator 1 of this embodiment is superior in maintainability as compared with the conventional actuator 1 in which the flow path is provided inside the peripheral wall of the actuator case.

Further, the tubular flow path member 51 made of metal or resin is processed on a straight pipe or welded or welded to a plurality of pipe members according to the form of the flow path to be provided on the outer surface Se of the actuator case 2. It can be easily formed by such means. Therefore, the tubular flow path member 51 can be easily manufactured with less man-hours than the above-mentioned liquid-cooled jacket.

Further, when the flow path recess 7 is formed on the outer surface Se of the actuator case 2 by processing, the outer surface Se exposed to the outside can be easily processed. Even if the actuator 1 has a long total length in the rotation axis direction (left-right direction in FIG. 4) of the rotor 3, such processing on the outer surface Se can be performed without difficulty. A suitable tubular flow path member 51 may be prepared accordingly.

Here, as shown in FIGS. 1 to 4, in the flow path recess 7 provided on the outer surface Se of the actuator case 2, the tubular flow path member 51 can be arranged inside the flow path recess 7. It has a groove shape extending on the outer surface Se.

Regarding the attachment of the tubular flow path member 51 into the groove-shaped flow path recess 7, for example, it is slightly larger than the cross-sectional dimension of the groove-shaped flow path recess 7 (the dimension of the cross section in the direction orthogonal to the longitudinal direction). A tubular flow path member 51 having a small outer diameter is produced. Then, the small-diameter tubular flow path member 51 is fitted into the groove-shaped flow path recess 7, and then the diameter is expanded by the action of internal pressure to engage with the flow path recess 7. As a result, the tubular flow path member 51 can be installed in the flow path recess 7.
Alternatively, the tubular flow path member 51 is fitted into the groove-shaped flow path recess 7 and then heated to plastically flow the surface of the tubular flow path member 51 and join it to the inner surface of the flow path recess 7. May be good.

Alternatively, after the tubular flow path member 51 is fitted into the groove-shaped flow path recess 7, the flow path recess 7 is covered with a cover plate 8 from above, as shown in FIG. 5, for the flow path. The tubular flow path member 51 can also be sandwiched and fixed between the recess 7 and the cover plate 8. In the illustrated example, the cover plate 8 has a rectangular plate shape that covers almost the entire outer surface Se, but covers at least a part of the tubular flow path member 51 in the groove-shaped flow path recess 7. All you need is. The cover plate 8 can be attached to the outer surface Se or the like by a fixing means such as a screw.

A filler or a heat transfer agent can be sandwiched between the flow path recess 7 and the tubular flow path member 51, if necessary.

The extending shape of the tubular flow path member 51 and the groove-shaped flow path recess 7 on the outer surface Se of the actuator case 2 is appropriately determined according to the desired cooling effect and other conditions of the flow path on the outer surface Se. can do. However, from the viewpoint of obtaining a sufficient cooling effect, it is desirable that the tubular flow path member 51 extends all over the outer surface Se.

In the illustrated embodiment, when the outer surface Se is viewed from the front, the flow path of the tubular flow path member 51 is on one side PS1 side of the outer surface Se in the circumferential direction (vertical direction in FIG. 4) of the rotor 3. At one end PE1 side in the rotation axis direction (left-right direction in FIG. 4) of the rotor 3, the rotor 3 is curved from a direction inclined or orthogonal to the rotation axis direction toward a direction parallel to the rotation axis direction and parallel to the rotation axis direction. It enters on the outer surface Se along the direction. Then, the flow path is curved or bent at one end PE1 side and the other end PE2 side in the direction of the rotation axis from one side PS1 to the other PS2, while reversing the traveling direction. , Extends in the direction of the axis of rotation. That is, the flow path meanders from one side PS1 toward the other side PS2. On the other side PS2 side, at one end PE1 side in the rotation axis direction (left-right direction in FIG. 4) of the rotor 3, the flow path escapes outward from the outer surface Se along a direction parallel to the rotation axis direction. Therefore, it is curved from a direction parallel to the direction of the rotation axis toward a direction inclined or orthogonal to the direction of the rotation axis.

In this way, the flow path extends in a direction inclined or orthogonal to the rotation axis direction of the rotor 3 on the outside of the outer surface Se on each of the one side portion PS1 side and the other side portion PS2 side. The flow path can be provided without interference with components that may be provided adjacent to the actuator case 2 in the direction of the rotation axis. In other words, when the flow path portion exiting from the outer surface Se extends parallel to the rotation axis direction of the rotor 3, there is a risk of interference with parts adjacent to the rotation axis direction. The flow path is preferably exited from the outer surface Se in a direction orthogonal to the direction of the rotation axis, as shown in the illustrated example.

If the actuator 1 is attached to the motor support plate or the like described later on the other end PE2 side in the rotation axis direction, it is on the one end PE1 side in the rotation axis direction opposite to the side to which the actuator 1 is attached. It is preferable to arrange the tubular flow path member 51 so that the flow path inlet Fi and the flow path outlet Fо are located. As a result, especially when the actuator 1 is fixedly supported in a cantilever shape, it becomes easy to secure a space for connecting the pipes, so that the maintainability is excellent. It is also possible to reverse the direction in which the liquid flows in the tubular flow path member 51 so that the end portion of the tubular flow path member 51 as the flow path inlet Fi and the end portion of the tubular flow path member 51 as the flow path outlet Fо are mutually replaced.
The same can be said for the positions of the flow path inlet Fi and the flow path outlet Fо of the flow path recess 37 described later.

Here, the flow path of the tubular flow path member 51 may be provided on one or more outer surface Se of the actuator case 2 in a substantially central region in the circumferential direction of the rotor 3 and slightly closer to one end in the rotation axis direction. In order to avoid the hole 9 for the motor wiring, the meandering interval of the central portion of the rotor 3 in the circumferential direction is set larger than that of the other portions.

Then, in this embodiment, the flow path recess 7 extends in the rotation axis direction corresponding to the straight line portion so that a straight line portion extending in the rotation axis direction of the tubular flow path member 51 is arranged inside the recess 7. It has a straight groove shape of a book. The curved portion of the tubular flow path member 51 on one end PE1 side and the other end PE2 side is located so as to protrude from the groove-shaped flow path recess 7 and project in the direction of the rotation axis. The flow path recess 7 having such a straight groove shape is preferable because it can be easily processed into the outer surface Se.

Although not shown, the recess for the flow path can be formed into a groove shape including bending or bending so that both the straight portion and the curved portion of the tubular flow path member 51 are arranged inside the recess, for example. is there.
The flow path recess is not limited to the groove shape described above as long as at least a part of the tubular flow path member 51 can be arranged inside the recess.

Further, the recess for the flow path may be a concave shape other than the groove shape.
As can be seen from FIG. 6A, the flow path recess 17 of the embodiment shown in FIG. 6 has a rectangular or other shape when viewed from the front of the outer surface Se. The recessed recess 17 for a flow path, which extends from one end PE1 to the other end PE2 in the rotation axis direction of the outer surface Se and occupies a relatively large area in the circumferential direction, is shown inside FIG. 6 (b). As described above, the tubular flow path member 51 is arranged so that the entire part from the straight portion on one side portion PS1 side to the straight portion on the other side portion PS2 side of the tubular flow path member 51 enters. The actuator 1 shown in FIG. 6 has substantially the same configuration as that shown in FIG. 1 except for the shape of the flow path recess 17 provided on one outer surface Se of the actuator case 2.

Further, the outer surface Se may be provided with a flow path convex portion protruding from the outer surface Se instead of the flow path concave portion as described above.
In the embodiment illustrated in FIG. 7, a columnar convex portion 27 for a flow path such as a plurality of prisms protruding from the outer surface Se and extending in the rotation axis direction is provided around the outer surface Se in a substantially central region in the rotation axis direction. They are provided at intervals in the direction. As shown in FIG. 7B, the flow path convex portion 27 can hold a straight portion of the tubular flow path member 51 or the like between adjacent objects in the circumferential direction. The flow path convex portion 27 is a part of the outer surface Se and is integrated with the outer surface Se. The convex portion for the flow path can have various shapes as long as it can hold the tubular flow path member 51.
The actuator 1 of FIG. 7 is substantially the same as that shown in FIG. 1, except for one outer surface Se provided with the convex portion 27 for the flow path.

FIG. 8 shows still another embodiment of the actuator 1.
The actuator 1 of FIG. 8 is shown in FIG. 1 except that a groove-shaped flow path recess 37 provided on one outer surface Se and extending from the outer surface Se is formed as a part of the flow path. It has substantially the same configuration as that of the one.

A lid-shaped flow path member 52 that covers the above-mentioned flow path recess 37 is attached to the outer surface Se. As a result, a flow path is partitioned between the groove-shaped recess for the flow path 37 and the lid-shaped flow path member 52 that covers the groove-shaped recess 37. The lid-shaped flow path member 52 may be any as long as it can cover the flow path recess 37, but in the illustrated example, it has a rectangular plate shape that covers almost the entire outer surface Se. The lid-shaped flow path member 52 is configured to be fixed to, for example, the outer surface Se, and if necessary, a seal member (not shown) for preventing liquid leakage may be provided between the lid-shaped flow path member 52 and the outer surface Se.

More specifically, the flow path recess 37 is a straight portion that enters the outer surface Se from one end PE1 on one side PS1 side and extends in the direction of the rotation axis, and one end PE1 side and the other end PE2 side. It has a shape that passes through the outer surface Se from one end portion PE1 on the other side portion PS2 side, including a curved portion that is inverted at each of the above. However, the shape of the flow path recess that becomes a part of the flow path can be appropriately changed according to the desired shape of the flow path and the like. Although not shown, it may be preferable to provide such a recess for a flow path, which serves as a flow path, so as to come out from the outer surface in a direction inclined or orthogonal to the rotation axis direction of the rotor.

The above-mentioned flow path recess 37 used as a part of the flow path is also included in the flow path recess and / or convex portion referred to here. “For flow path” of the recessed and / or convex portion for the flow path means that the concave and / or convex portion is directly used for arranging or forming the flow path on the outer surface Se. Specifically, as described in the above-described embodiment, the concave and / or convex portions that hold the flow path of the tubular flow path member from the outside, the concave portions that form a part of the flow path, and the like are flow paths. It becomes a concave part and / or a convex part.

In order to provide the recessed and / or convex portion for the flow path described above on the outer surface Se as a part of the outer surface Se of the actuator case 2, the concave and / or convex portion for the flow path is provided by extrusion molding or casting. An actuator case 2 having an outer surface Se can be formed. Alternatively, the flat surface of the actuator case 2 may be processed by cutting or the like to be formed on the outer surface Sa having the recessed portion and / or the convex portion for the flow path.

9 to 12 show the actuator 11 of another embodiment. Since the internal structure of the actuator 11 can be substantially the same as that of the actuator 1 described above, the description thereof will be omitted again. As shown in FIG. 10, the actuator case 12 of the actuator 11 includes a stator frame 15 having a polygonal cross section and flanges 16 provided at each end of the stator frame 15. The stator frame 15 has a substantially square tubular shape in cross section as a whole, and four corners in the circumferential direction thereof are cut off, and a square columnar recess portion 15a is provided therein. Has been done. Here, the outer surface Se excluding the recessed portion 15a of the stator frame 15 is referred to as the four main outer surface Se of the actuator case 12. One flange 16 located on the front side of FIG. 10 has a substantially disk shape. The other flange 16 located on the inner side of FIG. 10 has a flat plate shape having a polygonal shape when viewed from the front, and has hole-shaped connecting portions 16a projecting to the outer peripheral side at four points in the circumferential direction and the connection thereof. A bolt 16b inserted into the portion 16a is provided. A connecting hole 16c such as a screw may be provided at at least one position on the side surface of the other flange 16. Between the other flange 16 and the stator frame 15, a stepped portion 15b recessed from the outer surface Se of the stator frame 15 is provided over the entire circumference.

As shown in FIGS. 10 and 11, each of the four main outer surface Se of the actuator case 12 of the actuator 11 is a tubular flow path member 71 that serves as a flow path, similarly to the actuator 1 shown in FIGS. Is provided with a groove-shaped recess for a flow path 47 to which the Each of the flow path recesses 47 is formed on each outer surface Se in a straight line along the rotation axis direction (left-right direction in FIG. 11) so as to penetrate from one end PE1 to the other end PE2 in the rotation axis direction. There is. On each outer surface Se, a meandering and extending tubular flow path member 71 is fitted into the four flow path recesses 47 formed on the outer surface Se. For example, the tubular flow path member 71 can be fixed to the flow path recess 47 by interposing a paste between the flow path recess 47 and the tubular flow path member 71.

As can be seen from FIG. 11, the flow path formed by the tubular flow path member 71 on each outer surface Se is located on one side PS1 side of the outer surface Se in the circumferential direction (vertical direction in FIG. 11). It enters the outer surface Se on one end PE1 in the direction of the rotation axis in the direction along the direction of the rotation axis. The flow path that has entered the outer surface Se in this way is curved on one end PE1 side and the other end PE2 side in the direction of the rotation axis from one side PS1 to the other side PS2. It meanders while reversing the direction of travel, and extends in the direction of the rotation axis. In each of the one end PE1 and the other end PE2, the curved portion of the tubular flow path member 71 escapes from the inside of the flow path recess 47, and is outward from one end PE1 or the other end PE2 of the outer surface Se in the rotation axis direction. It is protruding. Then, in the other side portion PS2, the flow path exits from the outer surface Se in the direction along the rotation axis direction. The curved portion of the tubular flow path member 71 is housed and arranged in the above-mentioned step portion 15b between the other flange 16 and the stator frame 15.

In the case where the four outer surface Se are adjacent to each other in the circumferential direction, the tubular flow path members 71 attached to the flow path recesses 47 on the outer surface Se are mutually used, for example, a resin flexible tube 72a and a resin flexible tube 72a. It is connected by a flow path connecting portion 72 composed of a metal connector 72b or the like. More specifically, the flow path connecting portion 72 is a straight tubular flexible tube 72a that connects a bent tubular connector 72b connected to each end of adjacent tubular flow path members 71 and the connectors 72b to each other. including. When the flow path connecting portion 72 includes the flexible tube 72a, the thickness or outer diameter of the tubular flow path member 71 at the time of manufacture is uneven or non-uniform, and the tubular flow path member 71 is made into a flow path recess 47 by using a paste. The flexible tube 72a can absorb the contraction or expansion of the tubular flow path member 71 due to heating or the like when fixing the inside.
The flow path connecting portion 72 may be located so as to protrude outward from one end portion PE1 of the outer surface Se in the direction of the rotation axis, among the parts constituting the flow path. However, the protruding end of the flow path connecting portion 72 is positioned inside the rotary axis direction (on the right side in FIG. 11) with respect to the end surface of the encoder 19 provided at the end portion of the actuator 11 on the PE1 side at one end in the rotary axis direction. Is preferable. As a result, it is possible to suppress the interference of the flow path connecting portion 72 with other parts.

Here, all the inflow side end portion and the outflow side end portion of the tubular flow path member 71 on each outer surface Se are positioned on the one end portion PE1 side of the outer surface Se, and the one end portion PE1 side thereof is shown in FIG. As described above, the tubular flow path members 71 of the adjacent outer surface Se are connected to each other by the flow path connecting portion 72. Then, the inflow side end of the tubular flow path member 71 located at the most one end of the flow path is connected to the liquid supply tube 73, and the tubular flow path member 71 located at the farthest end of the flow path is connected. The outflow side end of the is connected to the liquid discharge tube 74. The inflow side end of the tubular flow path member 71 connected to the liquid supply tube 73 and the outflow side end of the tubular flow path member 71 connected to the liquid discharge tube 74 are located adjacent to each other in the circumferential direction. As a result, the cooling liquid supplied from the liquid supply tube 73 passes through each of the tubular flow path members 71 in the four outer surface Se as the flow paths in sequence, cools the same, and then is discharged from the liquid discharge tube 74. Cool. Each end of the liquid supply tube 73 and the liquid discharge tube 74 is inserted into and held in a hole provided in the plate member 75 into a plate member 75 connected to a stator frame 15 or the like. The liquid supply tube 73 and the liquid discharge tube 74 are preferably located inside the end face of the encoder 19 in the direction of the rotation axis. In this example, as can be seen from FIG. 11, the plate member 75 is also located inside the rotary axis direction of the end face of the encoder 19, and the encoder 19 side is located at the most rotary axis direction end of the actuator 11. This is the end face of the encoder 19.

The vicinity of the outflow side end of the tubular flow path member 71 connected to the liquid discharge tube 74 tends to be difficult to be cooled because the cooling liquid whose temperature has risen passes through the flow path of the actuator 11. On the other hand, as described above, when the outflow side end and the inflow side end of the tubular flow path member 71 connected to the liquid supply tube 73 are arranged close to each other, the inflow occurs. The vicinity of the outflow side end is cooled by a relatively low temperature coolant before passing through the flow path flowing through the side end, and the temperature rise in the vicinity of the outflow side end can be effectively suppressed. As a result, the entire actuator 11 can be cooled in a well-balanced manner.
Further, in this case, it is not necessary to lower the temperature of the cooling liquid supplied from the inflow side end to the flow path. In other words, if the outflow side end is arranged away from the inflow side end, it sufficiently cools to the outflow side end where the temperature can rise, so that the outflow side end and the outflow side end are described as described above. It is necessary to supply the cooling liquid at a lower temperature to the inflow side end than when the inflow side end is arranged closer to the inflow side end.

In the actuator 11, as shown in FIG. 9, the four cover plates 18a covering each of the four outer surface Se in which the tubular flow path member 71 is attached in the flow path recess 47, and the cover plate 18a Also provides cover members 18b and 18c that cover all or part of each end of the actuator 11 on the outside in the direction of the rotation axis. The cover member 18b includes a tubular portion 18d having an octagonal cross section that surrounds and covers one of the flanges 16 and the flow path connecting portion 72, and a plate-shaped portion 18e that seals the ends of the tubular portion 18d. The cover member 18b is attached to the actuator case 12 by connecting portions 18f such as screws provided at a plurality of locations in the circumferential direction of the tubular portion 18d. The cover member 18c located at the end opposite to the cover member 18b in the direction of the rotation axis includes two substantially C-shaped members divided into two in the circumferential direction, and is mainly composed of the cover member 18c. It covers the above-mentioned step portion 15b between the other flange 16 and the stator frame 15 and the curved portion of the tubular flow path member 71. The cover member 18c can also be attached to the actuator case 12 with connecting portions 18g such as screws provided at a plurality of locations in the circumferential direction. A hole 18h is formed in the center of each cover plate 18a.

(Actuator cooling device)
The actuator cooling device is used for cooling motors such as servomotors, ball screws and other actuators. Here, as an example, an actuator cooling device that can be used for cooling the actuator 11 described above will be described. However, the actuator cooling device can be used not only for the actuator 1 described above, but also for actuators other than those actuators 1 and 11. The flow path of the actuator using the actuator cooling device is not limited to the flow paths of the actuators 1 and 11 described above, and the shape and structure of the flow path can be appropriately changed.

The actuator cooling device 81 illustrated in FIG. 13 has a circulation passage 82 for returning the coolant CL that has passed through the flow path provided in the actuator case 12 of the actuator 11 having the output shaft 13a to the flow path, and a circulation passage 82. It is provided with a heat exchanger 83 provided in the middle of the above. The heat exchanger 83 transfers the heat of the coolant CL to cold water CW such as industrial water or other refrigerant to cool the coolant CL. The coolant CL cooled by the heat exchanger 83 is sent back to the flow path of the actuator case 12 and used for cooling the actuator 11.

By the way, if the temperature of the coolant CL when cooling the actuator 11 becomes too low, dew condensation may occur on the actuator 11. The occurrence of such dew condensation may cause a short circuit or the like inside the actuator 11. In order to prevent this, the actuator cooling device 81 is provided with a dew condensation suppressing mechanism that suppresses the occurrence of dew condensation on the actuator 11.

More specifically, the circulation passage 82 of the actuator cooling device 81 extends around the cooling path 82a through which the coolant CL flows through the heat exchanger 83 and the heat exchanger 83 to pass the coolant CL through the heat exchanger 83. It has a bypass path 82b for flowing without passing through the heat exchanger 83, and a direction switching valve 84 provided at a branch point between the cooling path 82a and the bypass path 82b on the upstream side of the heat exchanger 83. The dew condensation suppressing mechanism includes a bypass path 82b and a direction switching valve 84. The direction switching valve 84 can have various configurations as long as the path can be switched between the cooling path 82a and the bypass path 82b. Specifically, the direction switching valve 84 may be, for example, an electromagnetic switching valve or a combination of a relief valve and an on-off valve.

In the actuator cooling device 81, when the coolant CL circulates in the circulation passage 82 and the flow path of the actuator 11 while being cooled by the heat exchanger 83 through the cooling path 82a, the temperature of the coolant CL becomes low. After that, the path through which the coolant CL flows through the direction switching valve 84 can be switched from the cooling path 82a to the bypass path 82b. Then, since the coolant CL passing through the bypass path 82b is not cooled by the heat exchanger 83, the temperature gradually rises. As a result, it is possible to prevent an excessive temperature drop of the coolant CL, and it is possible to effectively suppress the occurrence of dew condensation on the actuator 11. After the temperature of the coolant CL passing through the bypass path 82b rises to some extent, the path through which the coolant CL flows is switched from the bypass path 82b to the cooling path 82a by the direction switching valve 84, and the coolant CL is changed to the cooling path 82a. The coolant CL can be cooled by the heat exchanger 83 by passing it through to the reserve tank 85 side described later. In this case, since it is not necessary to stop or change the flow of the cold water CW on the heat exchanger 83 side, clogging of the piping on the heat exchanger 83 side is unlikely to occur, and the actuator 11 can be cooled stably.

The coolant CL can be kept flowing through the flow path of the actuator case 12 and the circulation passage 82 when the actuator 11 and the actuator cooling device 81 are operated, and in that case, the flow rate is kept constant without changing. In some cases.

In the actuator cooling device 81, the circulation passage 82 is further downstream of the heat exchanger 83 in the middle of the circulation passage 82, more specifically, downstream of the confluence MP of the cooling path 82a and the bypass path 82b. It further has a reserve tank 85 provided, and a coolant supply pump 86 that sends the coolant CL to the flow path of the actuator case 12 on the downstream side of the reserve tank 85.

Further, the actuator cooling device 81 includes an ambient temperature sensor 87 that measures the ambient temperature in an environment in which the actuator cooling device 81 and the actuator 11 are installed, and a coolant CL that is to be supplied to the flow path of the actuator case 12. It is preferable to include a liquid temperature sensor 88 for measuring the temperature. The ambient temperature sensor 87 and the liquid temperature sensor 88 can be, for example, a thermoelectric pair or the like. In this embodiment, the ambient temperature sensor 87 and the liquid temperature sensor 88 are provided inside or around the reserve tank 85.

According to such an actuator cooling device 81, the temperature of the coolant CL is monitored by the liquid temperature sensor 88, and the direction switching valve 84 is operated according to the change in the temperature to suppress the occurrence of dew condensation on the actuator 11. can do. Here, for example, the measured value of the temperature of the coolant CL by the liquid temperature sensor 88 and the measured value of the ambient temperature by the ambient temperature sensor 87 are compared. Next, depending on the comparison result, it is determined whether the coolant CL that has passed through the flow path of the actuator case 12 flows through the bypass path 82b or the cooling path 82a. Then, the direction switching valve 84 is controlled according to the determination.

In an example of controlling the coolant temperature shown in FIG. 14, first, the coolant CL flowing through the bypass path 82b in the circulation passage 82 of the actuator cooling device 81 is sent out toward the flow path of the actuator case 12. Then, the coolant temperature gradually rises due to the heat generated when the actuator 11 operates. When the coolant temperature reaches a predetermined upper limit value, the direction switching valve 84 switches the path of the coolant CL to flow the coolant CL through the cooling path 82a. After that, the coolant CL flowing through the cooling path 82a is cooled by the heat exchanger 83, and the temperature thereof gradually decreases. When the coolant temperature drops to the value measured by the ambient temperature sensor 87, the direction switching valve 84 switches the path so that the coolant CL flows through the bypass path 82b.

That is, here, when the temperature of the coolant CL supplied to the flow path of the actuator case 12 is equal to or lower than the ambient temperature, the coolant CL is allowed to flow in the bypass path, and the temperature of the coolant CL is equal to or higher than the set upper limit value. In this case, the coolant CL can be controlled to flow in the cooling path 82a. As a result, the cooling liquid having a temperature lower than the ambient temperature is suppressed from being sent to the actuator 11, so that the occurrence of dew condensation is effectively suppressed.

More specifically, the circulation passage 82 of the actuator cooling device 81 shown in FIG. 13 is a heat exchange between the inflow side passage portion 89a connecting the flow path of the actuator case 12 and the direction switching valve 84 and the cooling path 82a. The passage portion 89b in the vessel 83, the passage portion 89c that guides the coolant CL that has passed through the passage portion 89b in the cooling path 82a to the confluence MP, the passage portion 89d that connects the confluence MP and the reserve tank 85, and the reserve. It further has a passage portion 89e connecting the tank 85 and the coolant supply pump 86, and a passage portion 89f on the outflow side connecting the coolant supply pump 86 and the flow path of the actuator case 12. Further, the passage through which the cold water CW flows has at least a passage portion 90 passing through the heat exchanger 83.

The dew condensation suppressing mechanism of another embodiment can be configured by, for example, a cold water control unit such as a flow rate control valve (not shown) provided in the middle of a passage through which the cold water CW flows and capable of changing the flow rate of the cold water CW. In such a cold water control unit, for example, the temperature of the coolant CL can be adjusted by controlling the flow rate of the cold water CW according to the difference between the temperature of the coolant CL and the ambient temperature. As a result, excessive cooling of the actuator 11 can be suppressed, and the occurrence of dew condensation can be suppressed. Such a dew condensation suppressing mechanism of the cold water control unit can be additionally provided in the actuator cooling device 81 in addition to the dew condensation suppressing mechanism including the bypass path 82b and the direction switching valve 84 described above, and the bypass path 82b and the direction switching. It is also possible to eliminate the dew condensation suppressing mechanism including the valve 84 and provide the cold water control unit alone in the actuator cooling device 81. Therefore, when the dew condensation suppressing mechanism of the cold water control unit is provided, the dew condensation suppressing mechanism including the bypass path 82b and the direction switching valve 84 may not be provided.

(Injection device)
The actuators 1 and 11 as described above can be used as an injection molding machine, for example, a weighing motor 62 or an injection motor 63 mounted on an injection device 61 as shown in FIG.

In the injection device 61 illustrated in FIG. 15, the measuring motor 62 and the injection motor 63, and the measuring motor 62 and the injection motor 63 are fixed to each other, and are spaced apart from each other in a posture of standing on the slide base 101 of the moving device, for example. The two motor support plates 64, 65 and the front side (left side in FIG. 15) are located further forward than the motor support plates 64, which are rotationally driven by the weighing motor 62 and the injection motor 63. The screw 66 is driven forward and backward, and the cylinder 67 extends from the front surface of the motor support plate 64 on the front side to the front side and is arranged so as to surround the circumference of the screw 66. The metering motor 62 and the injection motor 63 are attached and supported on the rear side (right side in FIG. 15) of the two motor support plates 64 and 65, respectively. The two motor support plates 64, 65 are connected to each other by rods 64a at a plurality of locations, for example, four locations around the metering motor 62.

A heater 67a for heating the molding material plasticized by the screw 66 inside the cylinder 67 is arranged around the cylinder 67. The cylinder 67 has a tip portion 67b whose inner and outer diameters are reduced on the tip side in the axial direction, and a heater 67a is also arranged around the tip portion 67b. Further, the cylinder 67 has a supply port 67c for supplying the molding material inside the cylinder 67 on the rear end side in the axial direction, and a cooler 67d is arranged around the supply port 67c.

The metering motor 62 mainly includes a rotor 62a, a stator 62b arranged around the rotor 62a, and a stator frame 62c that surrounds the rotor 62a and the stator 62b and is provided with the stator 62b on the inner surface. Has been done. The rotor 63a is supported by bearings 62f inside the stator frame 63c at each end in the rotation axis direction. Further, the rotor 62a is spline-coupled to the measuring spline shaft 62d, and the measuring spline shaft 62d is connected to the screw mounting portion 62e to which the screw 66 is attached. At least a part of the outer peripheral surface of the measuring spline shaft 62d in the axial direction is formed with one or more keys 62g corresponding to the key grooves provided on the inner peripheral surface of the rotor 62a. As a result, the rotational driving force is transmitted from the measuring motor 62 to the screw 66, and the screw 66 can be rotated.

Further, the injection motor 63 is arranged further to the rear side of the motor support plate 65 located on the rear side of the measuring motor 62. The injection motor 63 is also mainly provided around the rotor 63a, the stator 63b arranged around the rotor 63a, and the rotor 63a and the stator 63b, and the stator 63b is provided on the inner surface of the stator frame. It has 63c and. The rotor 63a is supported by bearings 63d inside the stator frame 63c at each end in the direction of the rotation axis. In the injection motor 63, the rotor 63a is connected to a drive shaft including a screw nut connected to the screw 66 via a bearing. More specifically, the drive shaft includes an injection spline shaft 68a spline-coupled to a groove 63e provided on the inner peripheral side of the cylindrical rotor 63a, a screw nut 68b connected to the injection spline shaft 68a, and a screw nut. It has a screw shaft 68c screwed into 68b, and a rotating shaft 68e rotatably attached to the inside of the measuring spline shaft 62d via a bearing 68d. With this structure, the rotational driving force of the injection motor 63 is converted into a linear driving force in the direction in which the screw 66 moves forward and backward (the left-right direction in FIG. 15) and is transmitted to the screw 66.

A pressure detector 69a is arranged between the stator frame 63c of the injection motor 63 and the motor support plate 65. The pressure detector 69a is attached to each of the motor support plate 65 and the screw nut 68b, and detects the load acting on the pressure detector 69a in the transmission path of the driving force from the injection motor 63 to the screw 66. A tubular portion 69b is interposed between the pressure detector 69a and the stator frame 63c.
Further, on the rear end surface of the stator frame 63c of the injection motor 63 located on the side opposite to the drive shaft in the direction of the rotation axis, an encoder 69c which is connected to the rotor 63a by a shaft portion 69d and detects the rotation of the rotor 63a is provided. It is provided.

FIG. 16 shows another injection device 91 including the actuator 11 described above as the injection motors 11a and 11b. The injection device 91 includes a pair of injection motors 11a and 11b, a pair of ball screws 92a and 92b that convert the rotational motion of each actuator 11 into a linear motion in the axial direction (left-right direction in FIG. 16), and a pair of ball screws. The width direction of the plate member 95 between the plate member 95 attached to the 92a and 92b and driven by the ball screws 92a and 92b and between the pair of injection motors 11a and 11b and between the pair of ball screws 92a and 92b (FIG. 16). It is provided with a screw 96 arranged in the center in the vertical direction of the screw 96. The screw 96 is arranged in a cylinder 97 that surrounds the screw 96.

Further, on the rear end side of the screw 96, a pulley 98a for rotationally driving the screw 96 by a belt (not shown), a shaft 98b connected to the pulley 98a, and a screw 96 provided on the tip side of the shaft 98b in the axial direction. A screw mounting portion 98c to which the screw is mounted is provided. A through hole 95a is formed in the center of the plate member 95 in the width direction, and the shaft 98b is supported and arranged in the through hole 95a by a bearing 95b.

Each ball screw 92a, 92b includes a screw shaft 93a, 93b and a nut 94a, 94b. The screw shafts 93a and 93b are connected to the output shafts of the injection motors 11a and 11b. The nuts 94a and 94b are attached to the plate member 95 so as to be coaxial with the shaft insertion holes 95c and 95d provided in the plate member 95. In the illustrated example, the screw shafts 93a and 93b are arranged so as to penetrate the nuts 94a and 94b and the shaft insertion holes 95c and 95d.
The screw shafts 93a and 93b are rotationally driven by the injection motors 11a and 11b, so that the nuts 94a and 94b move forward in the axial direction. Along with this, the plate member 95 attached to the nuts 94a and 94b advances the screw 96 in the axial direction. As a result, an injection operation for advancing the screw 96 for injecting the molding material such as the resin material stored in the cylinder 97 toward the mold apparatus becomes possible.

The injection motors 11a and 11b are surrounded by the cover plate 18a and the cover members 18b and 18c described above. Around the connection portion between the injection motors 11a and 11b and the screw shafts 93a and 93b, one housing 99 having a cavity portion 99a in which the connection portion is arranged is provided. A U-shaped portion 99b in which the upper side is cut out and the cylinder 97 is inserted is formed between the hollow portions 99a in the width direction of the housing 99.

In such an injection device 91, the injection motors 11a and 11b may generate a large amount of heat, especially during operation in high cycle molding. Here, if the injection motors 11a and 11b are to be cooled by, for example, air cooling by a fan or the like, the cylinder 97 and the screw 96 are located adjacent to the injection motors 11a and 11b in the width direction and melt the molding material inside. May be unintentionally cooled. Further, the heat of the adjacent cylinder 97 and the screw 96 lowers the cooling efficiency of the injection motors 11a and 11b by the air cooling. Also, if a fan is installed, the width of the injection device 91 can be greatly increased.
Therefore, it is particularly effective to apply the liquid cooling with the coolant described above to the cooling of the injection motors 11a and 11b of the injection device 91.

1, 11 Actuator 11a, 11b Injection motor 2, 12 Actuator case 3 Rotor 3a, 13a Output shaft 4 Stator 5, 15 Stator frame 5a, 15a Recessed part 15b Step part 6, 16 Flange 16a Connecting part 16b Bolt 16c Connecting hole 6a Hole Part 6b Bearing 6c Recess 6d Through hole 7, 17, 37, 47 Concave for flow path 27 Convex part for flow path 8, 18a Cover plate 9 Hole 18b, 18c Cover member 18d Cylindrical part 18e Plate-shaped part 18f, 18g Connecting part 18h Hole 19 Encoder 51, 71 Tubular flow path member 52 Lid flow path member 61 Injection device 62 Weighing motor 62a Rotor 62b Stator 62c Stator frame 62d Weighing spline shaft 62e Screw mounting part 62f Bearing 62g Key 63 Injection motor 63a Rotor 63b Stator 63c Stator frame 63d Bearing 63e Groove 64, 65 Motor support plate 64a Rod 66 Screw 67 Cylinder 68a Injection spline shaft 68b Screw nut 68c Screw shaft 68d Bearing 68e Rotating shaft 69a Pressure detector 69b Cylindrical part 69c Encoder 69c Road connection 72a Flexible tube 72b Connector 73 Liquid supply tube 74 Liquid discharge tube 75 Plate member 81 Actuator cooling device 82 Circulation passage 82a Cooling path 82b Bypass path 83 Heat exchanger 84 Direction switching valve 85 Reserve tank 86 Coolant supply pump 87 Ambient temperature sensor 88 Liquid temperature sensor 89a to 89f, 90 Passage part 91 Injection device 92a, 92b Ball screw 93a, 93b Screw shaft 94a, 94b Nut 95 Plate member 95a Through hole 95b Bearing 95c, 95d Shaft insertion hole 96 Screw 97 Cylinder 98a Pulley 98b Shaft 98c Screw mounting part 99 Housing 99a Cavity part 99b U-shaped part 101 Slide base Se Outer surface Si Inner surface PE1 One end PE2 Other end PS1 One side PS2 The other side Fi Flow path inlet Fо Flow Road outlet CL Coolant CW Cold water MP Confluence

Claims (17)

An actuator mounted on an injection molding machine
It is provided with an actuator case that constitutes the exterior of the actuator and is provided with a flow path for flowing coolant on the outer surface.
An injection molding machine mounting actuator in which the actuator case has a recess and / or a convex portion for a flow path provided on the outer surface of the actuator case as a part of the outer surface. The actuator for mounting an injection molding machine according to claim 1, wherein the flow path recess and / or the convex portion includes a flow path recess recessed from the outer surface. The actuator for mounting an injection molding machine according to claim 2, wherein the recess for the flow path has a groove shape extending on the outer surface. The actuator for mounting an injection molding machine according to claim 2 or 3, wherein the flow path recess is provided on the outer surface thereof and has a shape capable of arranging a tubular flow path member having the flow path. The flow path concave portion and / or the convex portion includes the flow path convex portion protruding from the outer surface.
The actuator for mounting an injection molding machine according to any one of claims 1 to 4, wherein the protrusion for the flow path is provided on the outer surface and has a shape capable of holding the tubular flow path member having the flow path. .. The actuator for mounting an injection molding machine according to any one of claims 1 to 5, further comprising a tubular flow path member provided on the outer surface and having the flow path. The flow path recess and / or the convex portion includes a groove-shaped flow path recess that is recessed from the outer surface and extends on the outer surface to form a part of the flow path.
The item according to any one of claims 1 to 6, wherein the flow path is composed of a groove-shaped recess for the flow path and a lid-shaped flow path member that covers the recess for the flow path and is attached to the outer surface. The actuator for mounting on the injection molding machine described. The actuator for mounting an injection molding machine according to claim 7, further comprising a lid-shaped flow path member that covers the flow path recess and is attached to the outer surface. The actuator is an electric motor including a rotor, a stator arranged on the outer peripheral side of the rotor, and a stator frame that surrounds the rotor and the stator and is provided with the stator on the inner surface.
The actuator for mounting an injection molding machine according to any one of claims 1 to 8, wherein the actuator case has the stator frame. The injection molding machine according to claim 9, wherein the flow path extends outward from the outer surface in a direction inclined or orthogonal to the rotation axis direction of the rotor in a front view of the outer surface. Actuator for. An actuator cooling device used in the actuator for mounting an injection molding machine according to any one of claims 1 to 10 and supplying a cooling liquid to the flow path of the actuator case.
An actuator cooling device including a dew condensation suppressing mechanism that suppresses the occurrence of dew condensation on the actuator. A circulation passage that returns the coolant that has passed through the flow path of the actuator case to the flow path,
A heat exchanger provided in the middle of the circulation passage to cool the coolant is provided.
The circulation passage includes a cooling path through which the coolant flows through the heat exchanger, a bypass path through which the coolant flows without passing through the heat exchanger, and the cooling path on the upstream side of the heat exchanger. The actuator cooling device according to claim 11, further comprising a direction switching valve provided at a branch point between the bypass path and the bypass path. The circulation passage sends the cooling liquid to the reserve tank provided on the downstream side of the heat exchanger and the cooling liquid on the downstream side of the reserve tank in the middle of the circulation passage to the flow path of the actuator case. The actuator cooling device according to claim 12, further comprising a coolant supply pump. The actuator cooling device according to claim 12 or 13, further comprising an ambient temperature sensor for measuring the ambient temperature and a liquid temperature sensor for measuring the temperature of the coolant supplied to the flow path of the actuator case. The measured value of the temperature of the coolant by the liquid temperature sensor is compared with the measured value of the ambient temperature by the ambient temperature sensor, and the coolant passed through the flow path of the actuator case according to the comparison result. 14. The actuator cooling device according to claim 14, wherein the actuator cooling device determines whether to flow through the cooling path or the bypass path, and controls the direction switching valve. An injection molding machine comprising the actuator for mounting the injection molding machine according to any one of claims 1 to 10 and the actuator cooling device according to any one of claims 11 to 15. A method using the actuator cooling device according to any one of claims 12 to 15.
The temperature of the coolant supplied to the flow path of the actuator case is compared with the ambient temperature, and the coolant that has passed through the flow path of the actuator case is passed through the bypass path or the bypass path or the ambient temperature according to the comparison result. A method of using an actuator cooling device that determines which of the cooling paths to flow and controls the direction switching valve.