Heat cover for injection molding machine and injection molding machine

Abstract

As to a heat cover for an injection molding machine, simplification of a structure without impairing cooling performance and further improvement in workability are desired.　This heat cover for an injection molding machine is mounted on a heating barrel that injects a molding material from a fore end toward a die, and comprises: an inner heat cover disposed outside the heating barrel; and an outer heat cover disposed outside the inner heat cover. The rear end side of the inner heat cover has, between itself and a cooling unit provided at the rear end of the heating barrel, a discharge part for guiding a part of high-temperature gas generated around the heating barrel to the rear end side of the outer heat cover. The outer heat cover has a porous region on the die side, and has a non-porous region on the cooling unit side.

Description

Heat cover for injection molding machine and injection molding machine

[0001] The present disclosure relates to a heat cover for an injection molding machine and an injection molding machine.

[0002] Injection molding machines are equipped with a heat cover that covers the heated barrel. The heat cover is provided to protect operators from the heat generated by the heated barrel, so its surface temperature must be kept as low as possible. To address this issue, various measures have been taken, such as increasing the size and thickness of the heat cover, and applying heat-dissipating paint to the heat cover. Another proposal is to use a three-layer heat cover with multiple heat-dissipating holes in some of the heat covers (see Patent Document 1). Another proposal is to provide a purge cover with an exhaust port above the exhaust flow path on the front end side (fixed platen side) of the heated barrel (see Patent Document 2).

[0003] JP 2018-1713 A JP 2020-100071 A

[0004] In order to reduce the surface temperature of the heat cover, measures such as increasing the size or thickness of the heat cover, or applying a heat-dissipating paint to the heat cover, or making the heat cover have a three-layer structure as in Patent Document 1, increase the cost and weight. If the weight of the heat cover increases, the workability of the injection molding machine during assembly, maintenance, inspection, etc. will decrease.

[0005] Furthermore, when a purge cover such as that disclosed in Patent Document 2 is provided at the front end of the heat cover, the temperature of the hot air (high-temperature gas) tends to decrease at the front end of the heating barrel, but the purge cover cannot be expected to have the effect of decreasing the temperature of the hot air at the rear end of the heating barrel.

[0006] Therefore, it is desirable to simplify the structure of a heat cover for an injection molding machine and an injection molding machine equipped with the same without compromising cooling performance, and to further improve workability.

[0007] The heat cover for an injection molding machine disclosed herein is a heat cover for an injection molding machine that is attached to a heated barrel that injects molding material from its tip toward a mold, and comprises an inner heat cover that is arranged on the outside of the heated barrel, and an outer heat cover that is arranged on the outside of the inner heat cover, and the rear end side of the inner heat cover has an exhaust portion between it and a cooling unit provided at the rear end of the heated barrel for directing a portion of the high-temperature gas generated around the heated barrel to the rear end side of the outer heat cover, and the outer heat cover has a porous region on the mold side and a non-porous region on the cooling unit side.

[0008] The injection molding machine of the present disclosure also includes a mold, a mold clamping device that opens and closes the mold and clamps the mold, an injection device that includes a heated barrel that injects molding material from its tip toward the mold, and a cover for an injection molding machine of the present disclosure that is attached to the heated barrel.

[0009] 1 is a schematic configuration diagram of an injection molding machine 1 according to a first embodiment. FIG. 1 is an exploded perspective view of an injection device 4 according to the first embodiment. FIG. 2 is a perspective view of the injection device 4 according to the first embodiment. FIG. 3 is a perspective view showing the internal configuration of the injection device 4 according to the first embodiment. FIG. 4 is a view of the injection device 4 shown in FIG. 3 as viewed from the front end side. FIG. 5 is a view explaining the heat dissipation function of the heat cover according to the first embodiment. FIG. 6 is a perspective view showing the internal configuration of the injection device 4 according to the second embodiment. FIG. 7 is a perspective view showing the internal configuration of the injection device 4 according to the third embodiment. FIG. 8 is a cross-sectional view showing the internal configuration of the injection device 4 according to the fourth embodiment. FIG. 9 is a partial perspective view showing the rear end side of the heat cover according to the fourth embodiment. FIG. 10 is a view of the injection device 4 shown in FIG. 9 as viewed from the front end side. FIG. 11 is a partial perspective view showing the rear end side of the heat cover according to the fourth embodiment. FIG. 12 is a perspective view showing the internal configuration of the injection device 4 according to the fifth embodiment. FIG. 13 is a view of the injection device 4 shown in FIG. 13 as viewed from the front end side. FIG. 14 is a perspective view showing the internal configuration of the injection device 4 according to the sixth embodiment. FIG. 15 is a view of the injection device 4 shown in FIG. 15 as viewed from the front end side. FIG. 16 is a perspective view showing the injection device 4 according to a seventh embodiment. FIG. 17 is a perspective view showing the internal configuration of the injection device 4 according to the seventh embodiment. 13 is a diagram illustrating the heat dissipation function of the first outer heat cover 40 of the seventh embodiment. FIG. 14 is a perspective view showing an injection device 4 of a ninth embodiment.

[0010] Hereinafter, embodiments of the heat cover for an injection molding machine and the injection molding machine according to the present disclosure will be described. The drawings attached to this specification are all schematic diagrams, and the shape, scale, aspect ratio, etc. of each part have been modified or exaggerated from the actual product for ease of understanding. Furthermore, hatching indicating cross sections of components has been omitted as appropriate in the drawings.

[0011] In the drawings accompanying this specification, the direction parallel to the central axis OA of the heating barrel 10 shown in FIG. 2 is the X direction (hereinafter also referred to as the "axial direction X"). In the axial direction X, the front direction (front end side), which is the direction in which the heating barrel 10 advances and retreats, is designated X1, and the rear direction (rear end side) is designated X2. The vertical direction perpendicular to the axial direction X is designated the up-down direction Y. In the up-down direction Y, the upper direction (upper side) is designated Y1, and the lower direction (lower side) is designated Y2. The horizontal direction perpendicular to the axial direction X is designated the width direction Z. In the width direction Z, the right direction as viewed from the front side X1 is designated Z1, and the left direction is designated Z2. In this specification, "direction" may also be referred to as "side" as appropriate.

[0012] (First embodiment) Fig. 1 is a schematic diagram of an injection molding machine 1 according to a first embodiment. Fig. 2 is an exploded perspective view of an injection unit 4 according to the first embodiment. Fig. 3 is a perspective view of the injection unit 4 according to the first embodiment. Fig. 4 is a perspective view showing the internal configuration of the injection unit 4 according to the first embodiment. Fig. 5 is a view of the injection unit 4 shown in Fig. 3 as seen from the front end side. Fig. 6 is a diagram illustrating the heat dissipation function of the heat cover according to the first embodiment. Figs. 4 and 6 show only the left half of the heat cover cut along the X-Y plane including the central axis OA (the region Z2 to the left of the central axis OA).

[0013] As shown in Fig. 1, the injection molding machine 1 mainly comprises a mold 2, a mold clamping device 3, and an injection device 4. The injection molding machine 1 also comprises peripheral devices such as a robot that removes a molded product from the mold and a robot that inserts an insert part into the mold, but these are not shown in Fig. 1. Also, a heat cover (described below) provided on the injection device 4 is not shown in Fig. 1.

[0014] The mold 2 comprises a fixed mold 2a and a movable mold 2b. The fixed mold 2a is, for example, a mold having a concave portion on its molding surface. The fixed mold 2a is fixed in a fixed position. The movable mold 2b is, for example, a mold having a convex portion on its molding surface. The movable mold 2b is connected to a mold clamping device 3 and is supported so as to be movable along the axial direction X. The mold clamping device 3 is a device that opens, closes, and clamps the mold 2. The injection device 4 is a device that injects molten molding material into the interior of the closed mold 2. The injection device 4 is configured to be movable along the axial direction X.

[0015] As shown in Fig. 2, the injection device 4 includes a heating barrel 10 and a cooling unit 20. As will be described later, the injection device 4 also includes an inner heat cover 30, a first outer heat cover 40, and a second outer heat cover 50 as heat covers (heat covers for injection molding machines). Of the components of the injection device 4, Figs. 2 to 4 only show the components of the heat covers, heating barrel 10, and cooling unit 20.

[0016] The heated barrel 10 is a device that injects molten molding material (resin) from a nozzle 10a at the tip toward a mold. The heated barrel 10 includes a barrel body 11 and a heater 12. The barrel body 11 is a substantially cylindrical member that serves as a passageway for the molding material supplied thereto to move forward in the forward direction X1. A flow path (not shown) is provided inside the barrel body 11 for sending the molten molding material into the mold 2. The heater 12 is a heating device for melting the molding material filled therein. Multiple heaters 12 are arranged around the outer periphery of the barrel body 11. The heater 12 is, for example, a band heater that generates heat when supplied with power from a power supply unit (not shown). Note that the heater 12 is not limited to a band heater and may have any configuration that can heat the barrel body 11.

[0017] A cooling unit 20 is provided at the rear end side X2 of the heating barrel 10. The cooling unit 20 is a cooling device that prevents the molding material supplied from the hopper 13 (see FIG. 1 ) from melting and agglomerating before reaching the interior of the heating barrel 10. The cooling unit 20 of this embodiment includes a cooling jacket 21 and a barrel fixing flange 22. The cooling jacket 21 is a device that cools the rear end side X2 of the heating barrel 10 by circulating a cooling medium through a flow path (not shown) provided therein. The cooling jacket 21 includes a material supply port 23 that communicates with the material supply port (not shown) of the heating barrel 10. Granular molding material stored in the hopper 13 provided above the cooling jacket 21 is supplied to the flow path within the heating barrel 10 through the material supply port 23. Note that a cooling fan or the like may be used in place of the cooling jacket 21 in the cooling unit 20. The barrel fixing flange 22 is a member for fixing the heating barrel 10 to the cooling unit 20. When the cooling unit 20 does not have a barrel fixing flange 22 , a gap 31 (described later) serving as a discharge portion is formed between the rear end side X2 of the inner heat cover 30 and the cooling jacket 21 .

[0018] As shown in Fig. 3, the heat cover is a member that covers the periphery of the heated barrel 10. By providing the heat cover around the heated barrel 10, it is possible to protect the operator from the heat generated in the heated barrel. As shown in Figs. 2 and 3, the injection device 4 is equipped with an inner heat cover 30, a first outer heat cover 40, and a second outer heat cover 50 as the heat covers.

[0019] The inner heat cover 30 is a heat cover disposed outside the heated barrel 10. As shown in Fig. 5 , the inner heat cover 30 is configured to cover at least an upper side Y1 of the central axis X of the heated barrel 10. Also, as shown in Fig. 4 , in the injection device 4 of the first embodiment, a gap (discharge portion) 31 is formed between the rear end side X2 of the inner heat cover 30 and the barrel fixing flange 22 (cooling unit 20). The gap 31 is an opening for guiding a portion of the hot air (high-temperature gas) generated around the heated barrel 10 to the rear end side X2 of the first outer heat cover 40.

[0020] The length L of the gap 31 in the axial direction X needs to be appropriately set depending on the shapes of the heating barrel 10, the cooling jacket 21, the heat cover, etc. If the length L of the gap 31 in the axial direction X (see FIG. 4 ) is too large, hot air exceeding the cooling capacity of the non-porous region 42 (described later) flows into the first outer heat cover 40, making the surface of the non-porous region 42 prone to become hot. On the other hand, if the length L of the gap 31 in the axial direction X is too small, the amount of hot air flowing into the non-porous region 42 is reduced, making it impossible for the non-porous region 42 to exert its cooling capacity. The length L of the gap 31 in the axial direction X depends on the shapes of the heating barrel 10, the cooling jacket 21, the heat cover, etc., but is, for example, 5 mm or more and 10% or less of the length of the first outer heat cover 40 in the X direction.

[0021] As shown in FIG. 5 , the first outer heat cover 40 is a heat cover disposed outside the inner heat cover 30 on the upper side Y1 of the heated barrel 10. The first outer heat cover 40 is configured to cover the side Y1 above the central axis X of the heated barrel 10. The second outer heat cover 50 is a heat cover disposed outside the heated barrel 10 on the lower side Y2 of the heated barrel 10. The second outer heat cover 50 is configured to cover the side Y2 below the central axis X of the heated barrel 10. Therefore, as shown in FIG. 5 , the outer periphery of the heated barrel 10 is covered by the first outer heat cover 40 and the second outer heat cover 50. The first outer heat cover 40 and the second outer heat cover 50 may be joined in abutting relation to each other in the vertical direction Y, or may be joined in an overlapping relation to each other. A passage 43 is formed between the inner heat cover 30 and the first outer heat cover 40 to guide some of the hot air generated around the heated barrel 10 from the rear end side X2 to the front end side X1.

[0022] The hot air generated around the heating barrel 10 expands and becomes relatively lighter than the air around the heat cover. Because the front end side X1 of the heat cover is blocked during injection molding, some of the hot air flows to the rear end side X2 of the heating barrel 10 and then moves to the upper side Y1. The hot air that has moved to the upper side Y1 passes through the gap 31 and enters the passage 43 because the rear end side X2 of the heat cover is blocked. The hot air that has entered the passage 43 flows inside the passage 43 from the rear end side X2 to the front end side X1.

[0023] As shown in FIG. 2 , the first outer heat cover 40 has a porous region 41 on the front end side X1 (the side of the mold 2; see FIG. 1 ). Multiple holes 45 are formed in the porous region 41. The porous region 41 is a region for releasing hot air, which is guided from the periphery of the heating barrel 10 to the front end side X1 via the gap 31 and the passage 43, into the outside air through the multiple holes 45. The length of the porous region 41 in the axial direction X depends on the shapes of the heating barrel 10, the heat cover, and the like, but is, for example, at least half the total length of the first outer heat cover 40 and not more than 50 mm shorter than the total length of the first outer heat cover 40. The ratio of the porous region 41 to the non-porous region 42 (described below) in the axial direction X of the first outer heat cover 40 is, for example, 1:1 or more and 40:1 or less. The opening ratio of the porous region 41 per unit area is, for example, 1% or more and 25% or less.

[0024] As shown in FIG. 2 , the first outer heat cover 40 has a non-porous region 42 on the rear end side X2 (the side facing the cooling unit 20). The non-porous region 42 is a region that comes into contact with hot air guided from the periphery of the heating barrel 10 through the gap 31. In the axial direction X of the first outer heat cover 40, the front end of the non-porous region 42 is preferably located at the same position as the front end of the gap 31 (described below) or further forward (closer) than that position. The second outer heat cover 50 (lower side Y2) is entirely configured as a non-porous region. The second outer heat cover 50 may be entirely configured as a non-porous region, or may be configured as both a porous region and a non-porous region.

[0025] As shown in Fig. 4, the rear end sides X2 of the first outer heat cover 40 and the second outer heat cover 50 are each fixed to the cooling unit 20. As shown in Fig. 5, the inner heat cover 30 and the first outer heat cover 40 are connected by connecting members 44 (e.g., screws, spacers, etc.). Multiple connecting members 44 are arranged along the axial direction X. Note that the connecting members 44 may have any configuration as long as they can appropriately connect the inner heat cover 30 and the first outer heat cover 40.

[0026] In the heat cover configured as described above, some of the hot air generated around the heating barrel 10 flows along the axial direction X of the heating barrel 10 toward the rear end side X2, as shown in Fig. 6. In Fig. 6, solid arrows a1 conceptually indicate the flow of hot air. The hot air that has flowed to the rear end side X2 of the heating barrel 10 passes through the gap 31 and is guided upward Y1, then makes a U-turn and flows along the passage 43 toward the front end side X1.

[0027] At this time, the hot air actively comes into contact with the cooling jacket 21 and the barrel fixing flange 22, and heat is removed from the hot air. In Fig. 6, the wavy arrow a2 conceptually shows the heat removed from the hot air. Furthermore, as the hot air passes through the non-porous region 42 of the first outer heat cover 40, it comes into contact with the first outer heat cover 40. At this time, heat exchange occurs between the hot air and the outside air in the non-porous region 42, and heat is also removed from the hot air here.

[0028] If multiple holes like the porous region 41 are formed in the region corresponding to the non-porous region 42, the hot air inside the inner heat cover 30 is released directly into the outside air through the holes. This causes the temperature to rise around the region corresponding to the non-porous region 42 of the first outer heat cover 40. However, by providing the non-porous region 42 in the first outer heat cover 40 as in this embodiment, heat is removed from the hot air, thereby suppressing the temperature rise in this region.

[0029] Furthermore, the rear end side X2 of the first outer heat cover 40 is fixed to the cooling unit 20. This further accelerates the cooling of heat accumulated in the non-porous region 42 of the first outer heat cover 40. Furthermore, hot air flows toward the front end side X1 along the passage 43 between the inner heat cover 30 and the first outer heat cover 40. As the hot air flows through the passage 43 toward the front end side X1, it is exhausted through the porous region 41. Because the hot air exhausted through the porous region 41 is cooled by the non-porous region 42, excessive temperature rises can be prevented near the porous region 41 of the first outer heat cover 40. In FIG. 6 , the dashed arrow a3 conceptually represents cooled hot air. Note that in FIG. 6 and FIG. 18 (described below), the arrows a2 indicating heat removal from the hot air and the arrows a3 indicating cooled hot air are omitted as appropriate for clarity.

[0030] As described above, the heat cover of the first embodiment allows the structure of the heat cover to be simplified without impairing cooling performance. Therefore, the heat cover of the first embodiment and the injection molding machine equipped with the same can be prevented from increasing in cost and weight. Furthermore, the heat cover of the first embodiment and the injection molding machine 1 equipped with the same can prevent an increase in the weight of the heat cover, thereby further improving the workability when assembling the injection molding machine 1 and performing maintenance and inspection.

[0031] Second Embodiment The shape of the discharge portion of the heat cover of the second embodiment is different from that of the first embodiment. The other configurations of the injection unit 4 of the second embodiment are the same as those of the first embodiment. Therefore, in FIG. 7 described later, only the injection unit 4 and the rear end side of the heat cover are shown, and the entire injection molding machine 1 is not shown. Furthermore, in the description and drawings of the second embodiment, components equivalent to those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and redundant description will be omitted.

[0032] Fig. 7 is a perspective view showing the internal configuration of the injection unit 4 of the second embodiment. Fig. 7 is a view corresponding to Fig. 4 of the first embodiment. In Fig. 7 (a partially enlarged view), holes 32 (described below) present in the front right half (the region Z1 to the right of the central axis OA) of the heat cover cut along the X-Y plane including the central axis OA are shown by imaginary lines.

[0033] 7 , in the injection device 4 of the second embodiment, a hole 32 is provided on the rear end side X2 of the inner heat cover 30. The hole 32 is an opening for guiding a portion of the hot air (high-temperature gas) generated around the heating barrel 10 to the rear end side X2 of the first outer heat cover 40. The length L1 of the hole 32 in the axial direction X and the length L2 of the hole 32 in the width direction Z need to be appropriately set depending on the shapes of the heating barrel 10, the cooling jacket 21, the heat cover, etc.

[0034] If the opening area (L1 × L2) of the holes 32 is too large, hot air exceeding the cooling capacity of the non-porous region 42 will flow into the first outer heat cover 40, making the surface of the non-porous region 42 prone to become hot. On the other hand, if the opening area of ​​the holes 32 is too small, the amount of hot air flowing into the non-porous region 42 will be too small, making it difficult for the non-porous region 42 to exert its cooling capacity. The length L1 in the axial direction X and the length L2 in the width direction Z of the holes 32 depend on the shapes of the heating barrel 10, cooling jacket 21, heat cover, etc., but for example, the length L1 is 5 mm or more and 10% or less of the length of the first outer heat cover 40 in the X direction, and the length L2 is 5 mm or more and less than the length of the inner heat cover 30 in the Z direction.

[0035] In the heat cover of the second embodiment, the holes 32 provided in the inner heat cover 30 have the same function as the gaps 31 (see FIG. 4) of the heat cover of the first embodiment. Therefore, the heat cover of the second embodiment and the injection molding machine equipped with the same can simplify the structure without impairing cooling performance and further improve workability.

[0036] (Third Embodiment) The shape of the discharge portion of the heat cover of the third embodiment is different from that of the first embodiment. The other configurations of the injection unit 4 of the third embodiment are the same as those of the first embodiment. Therefore, in FIG. 8 described later, only the injection unit 4 and the rear end side of the heat cover are shown, and the entire injection molding machine 1 is not shown. Furthermore, in the description and drawings of the third embodiment, components equivalent to those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and redundant description will be omitted.

[0037] 8 is a perspective view showing the internal configuration of the injection unit 4 of the third embodiment. In Fig. 8 (partially enlarged view), a recess 33 (described later) present in the front right half (the region Z1 to the right of the central axis OA) of the heat cover cut along the XY plane including the central axis OA is shown by an imaginary line.

[0038] 8 , in the injection device 4 of the second embodiment, a recess 33 is provided on the rear end side X2 of the inner heat cover 30. The recess 33 is an opening for guiding a portion of the hot air (high-temperature gas) generated around the heating barrel 10 to the rear end side X2 of the first outer heat cover 40. The length L1 of the recess 33 in the axial direction X and the length L2 of the recess 33 in the width direction Z need to be appropriately set depending on the shapes of the heating barrel 10, the cooling jacket 21, the heat cover, etc.

[0039] If the opening area (L1 × L2) of the recess 33 is too large, hot air exceeding the cooling capacity of the non-porous region (described below) flows into the first outer heat cover 40, making the surface of the non-porous region more likely to become hot. On the other hand, if the opening area of ​​the recess 33 is too small, the amount of hot air flowing into the non-porous region is reduced, making it difficult to exert the cooling capacity of the non-porous region. The length L3 in the axial direction X and the length L4 in the width direction Z of the recess 33 depend on the shapes of the heating barrel 10, cooling jacket 21, heat cover, etc., but for example, the length L3 is 5 mm or more and 10% or less of the length of the first outer heat cover 40 in the X direction, and the length L4 is 5 mm or more and less than the length of the inner heat cover 30 in the Z direction.

[0040] In the heat cover of the third embodiment, the recess 33 provided in the inner heat cover 30 functions in the same manner as the gap 31 (see FIG. 4) of the heat cover of the first embodiment with respect to the hot air generated around the heating barrel 10. Therefore, the heat cover of the third embodiment and the injection molding machine equipped with it can simplify the structure without impairing cooling performance and further improve workability.

[0041] (Fourth Embodiment) The heat cover of the fourth embodiment differs from the first embodiment in that the inner heat cover 30 is provided with a partition plate 60. The other configurations of the injection unit 4 of the fourth embodiment are the same as those of the first embodiment. Therefore, in each drawing, only the injection unit 4 and the rear end side of the heat cover are shown, and the entire injection molding machine 1 is not shown. Furthermore, in the description and drawings of the fourth embodiment, components equivalent to those of the first embodiment are assigned the same reference numerals as those of the first embodiment, and redundant description will be omitted.

[0042] Fig. 9 is a cross-sectional view showing the internal configuration of the injection unit 4 of the fourth embodiment. Fig. 10 is a partial perspective view showing the rear end side of the heat cover of the fourth embodiment. Fig. 11 is a view of the injection unit 4 shown in Fig. 9 as seen from the front end side. Fig. 12 is a partial perspective view showing the rear end side of the heat cover of the fourth embodiment. Figs. 9, 10, and 12 show only the left half of the heat cover cut along the X-Y plane including the central axis OA (the region Z2 to the left of the central axis OA).

[0043] As shown in Fig. 9 , in the injection device 4 of the fourth embodiment, a partition plate 60 is provided at the rear end of the inner heat cover 30. The partition plate 60 is a member for restricting the flow rate of a portion of the hot air generated around the heating barrel 10 that moves from the gap 31 to the rear end side X2 of the first outer heat cover 40. As shown in Figs. 10 and 11 , the partition plate 60 is configured to cover the space between the inner heat cover 30 and a portion of the outer periphery of the heating barrel 10 on the upper side Y1 above the central axis X of the heating barrel 10. A gap 61 is provided between the partition plate 60 and the heating barrel 10.

[0044] When the partition plate 60 and the heated barrel 10 are shielded, most of the hot air generated around the heated barrel 10 flows toward the front end X1 of the heated barrel 10. This increases the temperature of the purge cover (not shown) provided at the front end X1 of the heated barrel 10. On the other hand, by providing a gap 61 between the partition plate 60 and the heated barrel 10, some of the hot air generated around the heated barrel 10 can be guided toward the rear end X2 of the first outer heat cover 40. As shown in FIG. 11 , by appropriately setting the distance s of the gap 61 between the partition plate 60 and the heated barrel 10, the flow rate of the hot air passing between the partition plate 60 and the heated barrel 10 can be adjusted. The distance s depends on the shapes of the heated barrel 10, the heat cover, etc., but is, for example, 5 mm or more and 75 mm or less.

[0045] Like the heat cover of the first embodiment, the heat cover of the fourth embodiment has a gap 31 between the inner heat cover 30 and the barrel fixing flange 22 (cooling unit 20). Therefore, the heat cover of the fourth embodiment and an injection molding machine equipped with the same can simplify the structure without impairing cooling performance and further improve workability.

[0046] Furthermore, the heat cover of the fourth embodiment is provided with the partition plate 60 on the rear end side X2 of the inner heat cover 30, thereby preventing an excessive flow of hot air from the rear end side X2 of the heating barrel 10 into the cooling jacket 21. This minimizes the impact on the temperature adjustment function of the cooling jacket 21. It also prevents a problem in which hot air flows into the non-porous region 42 of the first outer heat cover 40 (see FIG. 10 ) in an amount greater than the cooling capacity of the non-porous region 42, causing the surface temperature to rise and preventing the cooling capacity from being fully exerted.

[0047] 12, the bolt heads 24 for fixing the barrel fixing flange 22 to the cooling jacket 21 may protrude toward the front side X1 of the barrel fixing flange 22. If the bolt heads 24 of the barrel fixing flange 22 protrude, it may be difficult to appropriately adjust the size of the gap 31 (length L: see FIG. 4), depending on the shape of the inner heat cover 30. However, as in the heat cover of the fourth embodiment, by providing a partition plate 60 at the rear end of the inner heat cover 30 and appropriately setting the gap s (see FIG. 11) between the partition plate 60 and the heating barrel 10, it becomes possible to appropriately adjust the size of the portion for discharging hot air.

[0048] Fifth Embodiment The heat cover of the fifth embodiment differs from that of the fourth embodiment in the configuration of the partition plate 60. The other configurations of the heat cover of the fifth embodiment are the same as those of the fourth embodiment. Therefore, in each drawing, only the injection unit 4 and the rear end side of the heat cover are shown, and the entire injection molding machine 1 is not shown. Furthermore, in the description and drawings of the fifth embodiment, components equivalent to those of the fourth embodiment are given the same reference numerals as those of the fourth embodiment, and redundant explanations will be omitted.

[0049] Fig. 13 is a perspective view showing the internal configuration of the injection unit 4 of the fifth embodiment. Fig. 14 is a view of the injection unit 4 shown in Fig. 13 as seen from the front end side. Fig. 13 shows only the left half of the heat cover (the region Z2 to the left of the central axis OA) cut along the X-Y plane including the central axis OA. Note that in the fifth and sixth embodiments (described below), examples will be described in which a barrel fixing flange 22 having a bolt head 24 is used, as in the fourth embodiment.

[0050] As shown in Fig. 13 , in the injection device 4 of the fifth embodiment, a partition plate 60 of the inner heat cover 30 is provided with a plurality of holes 62. The holes 62 are openings that guide a portion of the hot air generated around the heated barrel 10 to the rear end side X2 of the first outer heat cover 40. As shown in Fig. 14 , the plurality of holes 62 provided in the partition plate 60 are arranged approximately evenly along the outer periphery of the heated barrel 10. Because the partition plate 60 of the fifth embodiment has a plurality of holes 62 that serve as openings, no gap is formed between the partition plate 60 and the heated barrel 10.

[0051] The diameter of the holes 62 provided in the partition plate 60 is, for example, 5 mm or more and 20 mm or less, depending on the shapes of the heating barrel 10, the cooling jacket 21, the heat cover, etc. The number of holes 62 to be arranged is, for example, 1 or more and 100 or less.

[0052] In the heat cover of the fifth embodiment, the multiple holes 62 provided in the partition plate 60 of the inner heat cover 30 function in the same way as the gap 61 formed between the partition plate 60 and the heating barrel 10 in the fourth embodiment with respect to the hot air generated around the heating barrel 10. Therefore, the heat cover of the fifth embodiment and the injection molding machine equipped with it can simplify the structure without impairing cooling performance and further improve workability.

[0053] Sixth Embodiment The heat cover of the sixth embodiment differs from that of the fourth embodiment in the configuration of the partition plate 60. The other configurations of the heat cover of the sixth embodiment are the same as those of the fourth embodiment. Therefore, in each drawing, only the injection unit 4 and the rear end side of the heat cover are shown, and the entire injection molding machine 1 is not shown. Furthermore, in the description and drawings of the sixth embodiment, components equivalent to those of the fourth embodiment are given the same reference numerals as those of the fourth embodiment, and redundant explanations will be omitted.

[0054] Fig. 15 is a perspective view showing the internal configuration of the injection unit 4 of the sixth embodiment. Fig. 16 is a view of the injection unit 4 shown in Fig. 15 as seen from the front end side. Fig. 15 shows only the left half of the heat cover (the region Z2 to the left of the central axis OA) cut along the XY plane including the central axis OA.

[0055] As shown in Fig. 15 , in the injection device 4 of the sixth embodiment, a partition plate 60 of the inner heat cover 30 is provided with a plurality of recesses 63. The recesses 63 are openings that guide a portion of the hot air generated around the heated barrel 10 to the rear end side X2 of the first outer heat cover 40. As shown in Fig. 16 , the plurality of recesses 63 provided in the partition plate 60 are arranged approximately evenly along the outer periphery of the heated barrel 10. Because the partition plate 60 of the sixth embodiment has a plurality of recesses 63 that serve as openings, no gap is formed between the partition plate 60 and the heated barrel 10.

[0056] The width w (see FIG. 16 ) of the recess 63 provided in the partition plate 60 depends on the shapes of the heating barrel 10, the cooling jacket 21, the heat cover, etc., but is, for example, 5 mm or more and less than the length of the partition plate 60 in the Z direction. The height h (see FIG. 16 ) of the recess 63 is, for example, 5 mm or more and less than the distance between the inner heat cover 30 and the heating barrel 10. The number of recesses 63 to be arranged is set appropriately depending on the width w of the recess 63, etc.

[0057] In the heat cover of the sixth embodiment, the multiple recesses 63 provided in the partition plate 60 of the inner heat cover 30 function in the same way as the gaps 61 formed between the partition plate 60 and the heating barrel 10 in the fourth embodiment with respect to the hot air generated around the heating barrel 10. Therefore, the heat cover of the sixth embodiment and the injection molding machine equipped with it can simplify the structure without impairing cooling performance and further improve workability.

[0058] Seventh Embodiment The heat cover of the seventh embodiment differs from the first embodiment in that the non-porous region 42 of the first outer heat cover 40 is provided with an uneven portion 46 (described below) as a cooling portion. The injection unit 4 of the seventh embodiment is otherwise configured the same as that of the first embodiment. Therefore, the entire injection molding machine 1 is not shown in the drawings. In addition, in the description and drawings of the seventh embodiment, components equivalent to those of the first embodiment are designated by the same reference numerals as those of the first embodiment, and redundant description will be omitted.

[0059] Fig. 17 is a perspective view showing the injection unit 4 of the seventh embodiment. Fig. 18 is a diagram illustrating the heat dissipation function of the first outer heat cover 40 of the seventh embodiment. Fig. 18 shows only the left half of the heat cover (the region Z2 to the left of the central axis OA) cut along the XY plane including the central axis OA.

[0060] 17, the injection device 4 of the seventh embodiment has an uneven portion 46 as a cooling portion in the non-porous region 42 of the first outer heat cover 40. The uneven portion 46 is provided to further promote heat exchange between the hot air flowing from the periphery of the heating barrel 10 and the outside air. As shown in the partially enlarged view of FIG. 17, the uneven portion 46 of this embodiment is composed of a portion whose cross section is convex and a portion whose cross section is concave.

[0061] The uneven portion 46 can be produced, for example, by forming an uneven shape on the surface of the first outer heat cover 40 by press working. By providing the uneven portion 46 in the non-porous region 42 of the first outer heat cover 40, the surface area per unit area can be increased compared to when the non-porous region 42 is a flat surface. As shown in Fig. 17 , the uneven portion 46 may be provided with a gap (flat surface) between it and the porous region 41, or may be provided adjacent to the porous region 41.

[0062] As with the heat cover of the first embodiment, the heat cover of the seventh embodiment also has a gap 31 between the inner heat cover 30 and the barrel fixing flange 22 (cooling unit 20). Therefore, the heat cover of the seventh embodiment and an injection molding machine equipped with the same can simplify the structure without impairing cooling performance and further improve workability.

[0063] 18 , part of the hot air generated around the heating barrel 10 passes through the gap 31 on the rear end side X2 of the inner heat cover 30 and is guided upward in the Y1 direction, passing through the non-porous region 42 of the first outer heat cover 40. Since the non-porous region 42 is provided with the uneven portion 46, more heat is removed from the hot air during heat exchange between the hot air and the outside air. Therefore, the cooling capacity of the non-porous region 42 provided in the first outer heat cover 40 can be further improved.

[0064] Eighth Embodiment The heat cover of the eighth embodiment differs from the seventh embodiment in that a heat sink 47 (described below) is provided as a cooling unit in the non-porous region 42 of the first outer heat cover 40. The injection device 4 of the eighth embodiment has the same other configuration as the seventh embodiment. Therefore, the entire injection molding machine 1 is not shown in the drawings. In addition, in the description and drawings of the eighth embodiment, components equivalent to those of the seventh embodiment are designated by the same reference numerals as those of the seventh embodiment, and redundant description will be omitted.

[0065] Fig. 19 is a perspective view showing an injection device 4 of the eighth embodiment. As shown in Fig. 19, the injection device 4 of the eighth embodiment includes a heat sink 47 as a cooling unit in the non-porous region 42 of the first outer heat cover 40. The heat sink 47 is a heat dissipation device that further promotes heat exchange between the hot air flowing from around the heating barrel 10 and the outside air. Examples of materials that can be used for the heat sink 47 include copper and aluminum. By providing the heat sink 47 in the non-porous region 42 of the first outer heat cover 40, the surface area per unit area can be increased compared to when the non-porous region 42 is a flat surface.

[0066] As with the heat cover of the first embodiment, the heat cover of the eighth embodiment also has a gap 31 between the inner heat cover 30 and the barrel fixing flange 22 (cooling unit 20). Therefore, the heat cover of the eighth embodiment and an injection molding machine equipped with the same can simplify the structure without impairing cooling performance and further improve workability.

[0067] Furthermore, according to the heat cover of the eighth embodiment, the heat sink 47 is provided in the non-porous region 42 of the first outer heat cover 40, so that more heat is removed from the hot air during heat exchange between the hot air and the outside air, thereby further improving the cooling capacity of the non-porous region 42 provided in the first outer heat cover 40.

[0068] Ninth Embodiment The heat cover of the ninth embodiment differs from the seventh embodiment in that a cooling device (described later) is provided as a cooling section in the non-porous region 42 of the first outer heat cover 40. The injection device 4 of the ninth embodiment has the same other configuration as the seventh embodiment. Therefore, the entire injection molding machine 1 is not shown in the drawings. In addition, in the description and drawings of the ninth embodiment, components equivalent to those of the seventh embodiment are designated by the same reference numerals as those of the seventh embodiment, and redundant description will be omitted.

[0069] Fig. 20 is a perspective view showing an injection device 4 of the ninth embodiment. As shown in Fig. 20, the injection device 4 of the ninth embodiment is provided with a cooling device 48 as a cooling section in the non-porous region 42 of the first outer heat cover 40. The cooling device 48 is a device for lowering the temperature of hot air flowing from around the heating barrel 10. The cooling device 48 may have the same configuration as the cooling jacket 21, or may be a cooling fan, for example.

[0070] As with the heat cover of the first embodiment, the heat cover of the ninth embodiment also has a gap 31 between the inner heat cover 30 and the barrel fixing flange 22 (cooling unit 20). Therefore, the heat cover of the ninth embodiment and an injection molding machine equipped with the same can simplify the structure without impairing cooling performance and further improve workability.

[0071] Furthermore, according to the heat cover of the ninth embodiment, the cooling device 48 is provided in the non-porous region 42 of the first outer heat cover 40, so more heat is removed from the hot air flowing through the non-porous region 42. This makes it possible to further improve the cooling capacity of the non-porous region 42 provided in the first outer heat cover 40.

[0072] (Modifications) Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments. Various additions, substitutions, modifications, partial deletions, etc. are possible in these embodiments without departing from the gist of the present disclosure or the spirit of the present disclosure derived from the content of the claims and their equivalents. Furthermore, these embodiments can also be implemented in combination. For example, in the above-described embodiments, the order of each operation and the order of each process are shown as examples and are not limited to these.

[0073] In the first to third embodiments, the gap 31, the hole 32, and the recess 33 serving as the discharge portion may be used alone or in appropriate combination. The shape of the hole 32 is not limited to a circle, and may be, for example, a square, an ellipse, a triangle, a diamond, or the like, or may be a shape obtained by partially modifying or combining a specific shape. The same applies to the recess 33.

[0074] In the fourth to sixth embodiments, the gaps 61, holes 62, and recesses 63 of the partition plate 60 may be used individually or in any suitable combination. The shape of the holes 62 is not limited to a circle and may be, for example, a rectangle, an ellipse, a triangle, a diamond, or the like. It may also be a shape obtained by partially modifying a specific shape or a shape obtained by combining multiple shapes. The same applies to the recesses 63. The partition plate 60 is not limited to being located at the rear end of the inner heat cover 30, as long as it is located on the rear end side X2. For example, the partition plate may be located at a distance of 1 mm or more from the rear end of the inner heat cover 30 toward the front end side X1, and up to 10% or less of the length of the first outer heat cover 40 in the X direction.

[0075] In the seventh embodiment, the uneven portion 46 formed in the non-porous region of the first outer heat cover 40 is composed of a portion having a convex cross section and a portion having a concave cross section, but is not limited to this. The uneven portion 46 may be composed of only a portion having a convex cross section, or only a portion having a concave cross section. Furthermore, the planar shapes of the convex cross section and the concave cross section are not limited to a circle and may be, for example, a rectangle, an ellipse, a triangle, a diamond, etc., or may be a shape obtained by partially modifying a specific shape or a shape obtained by combining multiple shapes. Furthermore, the convex cross section and the concave cross section may be the same size or different sizes.

[0076] In the first to seventh embodiments, an example has been described in which the rear end side X2 of the first outer heat cover 40 is fixed to the cooling unit 20, but the present invention is not limited to this. The rear end side X2 of the first outer heat cover 40 may be in contact with the cooling unit 20 without being fixed thereto, or may not be in contact at all. Furthermore, the second outer heat cover 50 (lower side Y2) may be provided with a porous region having the same configuration as the first outer heat cover 40.

[0077] The following supplementary notes are further provided with respect to the above-described embodiment. (Supplementary Note 1) A heat cover for an injection molding machine is attached to a heated barrel that injects molding material from its tip toward a mold, and includes an inner heat cover (30) arranged outside the heated barrel and an outer heat cover (40) arranged outside the inner heat cover, the rear end of the inner heat cover having a discharge portion between it and a cooling unit provided at the rear end of the heated barrel for directing a portion of high-temperature gas generated around the heated barrel to the rear end of the outer heat cover, the outer heat cover having a porous region (41) on the mold side and a non-porous region (42) on the cooling unit side. (Supplementary Note 2) The discharge portion is composed of at least one of a gap (31) formed between the inner heat cover and the cooling unit, a hole (32) provided in the inner heat cover, and a recess (33) provided in the inner heat cover. (Supplementary Note 3) A partition plate (60) is provided at the rear end side of the inner heat cover to limit the flow rate of a portion of high-temperature gas generated around the heated barrel moving from the discharge portion to the rear end side of the outer heat cover, and at least one of a gap (61), a hole (62), and a recess (63) is provided between the inner heat cover including the partition plate and the heated barrel. (Supplementary Note 4) The rear end side of the outer heat cover is fixed to the cooling unit. (Supplementary Note 5) A cooling portion is provided in the non-porous region of the outer heat cover. (Supplementary Note 6) An injection molding machine (1) comprising a mold (2), a mold clamping device (3) that opens, closes, and clamps the mold, an injection device (4) including a heated barrel (10) that injects molding material from its tip toward the mold, and the injection molding machine cover attached to the heated barrel.

[0078] 1: injection molding machine, 2: mold, 3: mold clamping device, 4: injection device, 10: heating barrel, 20: cooling unit, 30: inner heat cover, 31: gap (discharge section), 32: hole (discharge section), 33: recess (discharge section), 40: first outer heat cover, 41: porous region, 42: non-porous region, 46: uneven portion (cooling section), 47: heat sink (cooling section), 48: cooling device (cooling section), 50: second outer heat cover, 60: partition plate, 61: gap, 62: hole, 63: recess

Claims

1. A heat cover for an injection molding machine, which is attached to a heating barrel that injects molding material from the tip toward the mold, An inner heat cover positioned on the outside of the heating barrel, An outer heat cover is positioned outside the inner heat cover, Equipped with, The rear end of the inner heat cover has a discharge section between it and a cooling unit provided at the rear end of the heating barrel, for guiding a portion of the high-temperature gas generated around the heating barrel to the rear end of the outer heat cover. The outer heat cover has a porous region on the mold side and a non-porous region on the cooling unit side. Heat cover for injection molding machines.

2. The discharge section consists of at least one of the following: a gap formed between the inner heat cover and the cooling unit, a hole provided in the inner heat cover, and a recess provided in the inner heat cover. A heat cover for an injection molding machine according to claim 1.

3. The rear end of the inner heat cover is provided with a partition plate that restricts the flow rate of a portion of the high-temperature gas generated around the heating barrel from the discharge section to the rear end of the outer heat cover. Between the inner heat cover including the partition plate and the heating barrel, there is at least one of a gap, a hole, and a recess. A heat cover for an injection molding machine according to claim 1 or 2.

4. The rear end of the outer heat cover is fixed to the cooling unit. A heat cover for an injection molding machine according to claim 1 or 2.

5. The outer heat cover has a cooling section in the non-porous region, A heat cover for an injection molding machine according to claim 1 or 2.

6. mold and A mold clamping device that opens and closes the mold and clamps the mold, An injection apparatus including a heating barrel for injecting molding material from the tip toward the mold, A heat cover for an injection molding machine according to claim 1, which is attached to the heating barrel, An injection molding machine equipped with [a specific feature / feature].