Injection molding machine and cooling method for injection molding machine

Abstract

To improve maintainability of a material receiving mechanism of a material receiving part of an injection molding machine.SOLUTION: A material receiving mechanism 7 of an injection molding machine includes: a material receiving part 42 that receives a material supplied to the injection molding machine; at least one heat pipe 71 thermally connected to the material receiving part 42; and at least one heat sink 72 thermally connected to the at least one heat pipe 71.SELECTED DRAWING: Figure 3A

Description

[[Technical Field]]

[0001] The present invention relates to a material receiving mechanism for an injection molding machine, an injection molding machine including the same, and a cooling method for an injection molding machine. [[Background Art]]

[0002] An injection molding machine has a material receiving portion that receives material supplied from a hopper. The material receiving portion is normally provided near an end of a cylinder that houses a screw. Patent Document 1 describes that cooling water is circulated through a lower part of the material receiving portion to lower the temperature of the lower part of the material receiving portion. [[Prior Art Documents]] [[Patent Documents]]

[0003] [[Patent Document 1]] Japanese Patent Laid-Open No. 2009-119654 [[Summary of the Invention]] [[Problem to be Solved by the Invention]]

[0004] Generally, the material receiving portion of an injection molding machine is cooled with cooling water to make it difficult for backflow of material to occur. When cooling water is circulated for a long time, accumulation of calcium hypochlorite (limescale) and electrolytic corrosion may occur in the cooling water flow path. For this reason, cleaning of the flow path is required, which reduces maintainability. An object of the present disclosure is to provide a material receiving mechanism for an injection molding machine with improved maintainability. [[Means for Solving the Problem]]

[0005] This disclosure injection molding The machine , comprising: a material receiving portion that receives material supplied to the injection molding machine; at least one heat pipe; and a at least one heat sink connected to the at least one heat pipe. In one embodiment, the injection molding machine has a heating element, a blower for cooling the heating element, and a cover housing the heating element and the blower, wherein at least one heat pipe has an external portion outside the material receiving section connected to an internal portion inside the material receiving section, and a heat sink support portion connected to the connection section and supporting at least one heat sink, the heat sink support portion extending in a direction different from the connection section and housed in the cover. In another embodiment, the injection molding machine has a heating element, which includes a motor and a ball screw for driving the injection device. [[Effect of the Invention]]

[0006] This disclosure provides a material receiving mechanism for an injection molding machine with improved maintainability. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic front view of an injection molding machine according to the first embodiment. [Figure 2A] Figure 1 is a front view of the injection device of the injection molding machine shown. [Figure 2B] Figure 1 is a top view of the injection device of the injection molding machine shown. [Figure 3A] Figure 1 is a perspective view of the material receiving mechanism of an injection molding machine. [Figure 3B] Figure 1 is a front view of the material receiving mechanism of the injection molding machine. [Figure 3C] Figure 1 is a side view of the material receiving mechanism of the injection molding machine. [Figure 4A] This is a longitudinal cross-section of a heat pipe. [Figure 4B] This is a cross-sectional view of a heat pipe. [Figure 5] This is a perspective view of the material receiving section of the comparative example. [Figure 6] This is a front view of the injection device and cylinder of an injection molding machine according to a second embodiment. [Modes for carrying out the invention]

[0008] Hereinafter, several embodiments of the present invention will be described with reference to the drawings. In the following description, the direction along the rotation axis of the screw 33, or the direction of movement of the screw 33, will be referred to as the axial direction X, the direction from the injection device 3 toward the clamping device 2 with respect to the axial direction X will be referred to as the forward direction, and the direction from the clamping device 2 toward the injection device 3 will be referred to as the backward direction. The axial direction X is parallel to the horizontal direction. The direction perpendicular to the axial direction X and parallel to the horizontal direction will be referred to as the depth direction Y, and the direction perpendicular to the axial direction X and the depth direction Y and parallel to the vertical direction will be referred to as the vertical direction Z.

[0009] (First Embodiment) <Overall Structure> Figure 1 shows a schematic front view of the injection molding machine 1 according to the first embodiment. Figure 2A shows a front view of the injection device 3, and Figure 2B shows a top view of the injection device 3. Referring to Figure 1, the injection molding machine 1 is generally composed of a mold clamping device 2 that clamps the mold M, and an injection device 3 that heats and melts the material to be injected and then injects it.

[0010] <Mold clamping device 2> The mold clamping device 2 comprises a fixed platen 22 fixed on the bed 21 and to which a fixed mold M1 is attached, a mold clamping housing 23 that can slide on the bed 21, and a movable platen 24 that can slide on the bed 21 and to which a movable mold M2 is attached. The fixed platen 22 and the mold clamping housing 23 are connected by a number of tie bars 25. A mold clamping mechanism 26 for opening and closing the mold M is provided between the movable platen 24 and the mold clamping housing 23. The mold clamping mechanism 26 is composed of a toggle mechanism. Although not shown in the figures, the mold clamping mechanism 26 may be composed of a direct pressure type mold clamping mechanism, that is, a hydraulic type mold clamping cylinder.

[0011] <Injection device 3> The injection device 3 is mounted on a base 31. The injection device 3 comprises a cylinder 32, a screw 33 housed in the cylinder 32, and a drive mechanism 34 that drives the screw 33. The screw 33 is rotationally driven and driven in the axial direction X by the drive mechanism 34. The drive mechanism 34 is covered by a cover 35. A hopper 36 for supplying the material to be injected is provided near the rear end of the cylinder 32. The hopper 36 has a material supply opening 36A into which the material to be injected is supplied. An injection nozzle 37 for injecting the material is provided at the tip of the cylinder 32.

[0012] The injection device 3 is equipped with a nozzle touch device 38. The nozzle touch device 38 advances the injection device 3, thereby causing the injection nozzle 37 to touch the sprue bush M3 of the mold M. The nozzle touch device 38 connects the drive mechanism 34 and the stationary plate 22. The nozzle touch device 38 is composed of, for example, a mechanism using a hydraulic cylinder or a mechanism using a ball screw.

[0013] Referring to FIG. 2A, the cylinder 32 includes a cylinder body 41 and a material receiving portion 42. The material receiving portion 42 supports the hopper 36 of the injection molding machine 1 or is connected to the hopper 36. The cylinder body 41 and the material receiving portion 42 are connected in the axial direction X to form an integrated cylinder 32. The cylinder body 41 and the material receiving portion 42 respectively have cylindrical cavities 41A and 42A, and the cavity 41A of the cylinder body 41 and the cavity 42A of the material receiving portion 42 constitute an internal space for accommodating the screw 33. The material receiving portion 42 is connected to the cylinder body 41 at a position opposite to the mold clamping device 2 with respect to the axial direction X of the screw 33. The material receiving portion 42 is a member independent of the cylinder body 41, and is fixed to the cylinder body 41 by bolts (not shown).

[0014] Referring to FIG. 2B, the cylinder body 41 is provided with a heater 43. The heater 43 is supplied with power via a cable 45 from a power panel 44 provided outside the injection molding machine 1. The heater 43 is divided into a plurality of sections in the axial direction X. The heater 43 heats the cylinder body 41, thereby heating and melting the material inside the cylinder body 41. <Drive Mechanism 34 of Injection Device 3>

[0015] The configuration of the drive mechanism 34 will be described with reference to FIG. 2A. The drive mechanism 34 includes a front support base 51 located behind the cylinder 32, a rear support base 52 located behind the front support base 51, and a guide bar 53 connecting the front support base 51 and the rear support base 52. A slide plate 54 is connected to the guide bars 53, and the slide plate 54 can be guided by the plurality of guide bars 53 to move in the axial direction X.

[0016] The rear end of the screw 33 is rotatably supported by the slide plate 54. The material receiving portion 42 of the cylinder 32 is fixed to the front support base 51 via a fixing member 55. A plasticizing motor 56 is provided on the slide plate 54. The plasticizing motor 56 rotationally drives the screw 33 via a rotation transmission mechanism 57 composed of a pulley, a timing belt and the like.

[0017] The drive mechanism 34 has a ball screw 58 located between the rear support base 52 and the slide plate 54. The ball screw 58 is rotatably supported on the rear support base 52. A ball nut 59 that meshes with the ball screw 58 is fixed to the slide plate 54 via a connecting member 60. An injection motor 61 is provided on the rear support base 52. The injection motor 61 rotates the ball screw 58 by a rotation transmission mechanism 62 consisting of a pulley, timing belt, etc. The ball screw 58 drives the slide plate 54 in the axial direction X via the connecting member 60, and this drives the screw 33 in the axial direction X.

[0018] The motors that drive the injection device 3, namely the plasticizing motor 56 and the injection motor 61, are cooled to reduce the possibility of malfunction or shutdown due to heat generation. The ball screw 58 also generates heat due to its engagement with the ball nut 59, and is therefore cooled. Thus, the plasticizing motor 56, the injection motor 61, and the ball screw 58 are heat-generating components housed in the cover 35.

[0019] The injection unit 3 has a blower 63 for cooling these heat-generating parts. The blower 63 is a fan housed in the cover 35. In Figure 2A, the blower 63 is located on the top of the cover 35, but its installation position is not particularly limited and should be set so that the airflow from the blower appropriately hits each heat-generating part. The cover 35 is equipped with ventilation openings 39, and the air inside the cover 35 is replaced with air outside the cover 35 through the ventilation openings 39.

[0020] <Material receiving mechanism 7 of injection device 3> Figures 3A to 3C are perspective, front, and side views of the material receiving mechanism 7, respectively. Referring to Figures 2A, 3A to 3C, the injection molding machine 1 has a material receiving mechanism 7 connected to the hopper 36 of the injection molding machine 1. The material receiving mechanism 7 includes the material receiving section 42 described above, at least one heat pipe 71 thermally connected to the material receiving section 42, and at least one heat sink 72 thermally connected to the at least one heat pipe 71.

[0021] The material receiving section 42 has a cylindrical cavity 42A extending in the axial direction Z through which a screw 33 passes, and a cylindrical material supply hole 42B opening on the upper surface of the material receiving section 42. The hopper 36 is attached to the opening of the material supply hole 42B. The material supply hole 42B extends in the vertical direction Z and connects to the cavity 42A inside the material receiving section 42. The material receiving section 42 is made of casting. Multiple mounting bolt holes 42D are provided on both sides of the material receiving section 42 in the depth direction Y.

[0022] The material receiving section 42 functions not only as a mounting section for the hopper 36, but also as part of the cylinder 32. Since the cavity 41A of the cylinder body 41 and the cavity 42A of the material receiving section 42 are in communication, there is a possibility that the material heated and melted by the heater 43 of the cylinder body 41 may flow back into the hopper 36 through the material receiving section 42. Cooling the material receiving section 42 can reduce the possibility of material backflow and also increase the durability of the material receiving section 42 and the hopper 36. The heat pipe 71 and heat sink 72 constitute a cooling means for the material receiving section 42.

[0023] As shown in Figures 3A and 3C, the material receiving mechanism 7 has eight heat pipes 71, four on each side in the depth direction Y of the material receiving section 42, and one heat sink 72 connected to the eight heat pipes 71. The number of heat pipes 71 and heat sink 72 is not limited; at least one of each is sufficient. By providing multiple heat pipes 71, the material receiving section 42 can be cooled uniformly. Furthermore, it is preferable that the heat pipe group 71A on one side in the depth direction Y (see Figure 3A) and the heat pipe group 71B on the other side (see Figure 3A) are arranged symmetrically with respect to the XZ plane containing the center line C of the screw 33. In this embodiment, all heat pipes 71 have the same configuration, shape, and dimensions, but at least one of the configuration, shape, or dimensions may differ between one heat pipe 71 and another.

[0024] <Configuration of Heat Pipe 71> As shown in Figures 3B and 3C, each heat pipe 71 has an internal portion 71C located inside the material receiving section 42 and an external portion 71D located outside the material receiving section 42. The heat sink 72 is connected to the external portion 71D of at least one (in this case, all) heat pipes 71. Each heat pipe 71 extends linearly along its entire length. Therefore, the internal portion 71C of each heat pipe 71 also extends linearly inside the material receiving section 42. Since the heat pipes 71 are linear, no extra processing costs are required.

[0025] Figure 4A shows a longitudinal section of the heat pipe 71, and Figure 4B shows a cross-sectional view of the heat pipe 71. The internal portion 71C of the heat pipe 71 is thermally connected to the material receiving portion 42. The heat pipe 71 has a pipe 73 made of a metal with high thermal conductivity such as copper, and a wick 74 provided on the inner wall surface of the pipe 73. The inside of the wick 74 is an internal cavity 77, and a volatile liquid (working fluid) 75 is airtightly sealed in the internal cavity 77. The wick 74 may be made of a plurality of fine grooves formed on the inner wall surface, or it may be made of a mesh of fibers, as long as the working fluid 75 is transported inside the pipe 73 in the axial direction (vertical direction Z) of the pipe 73 by capillary action.

[0026] The working fluid 75 absorbs heat in the internal part 71C (high temperature part) of the heat pipe 71 and evaporates. The evaporated working fluid 75 moves through the internal cavity 77 of the heat pipe 71 to the external part 71D and is cooled at the connection point with the heat sink 72 (low temperature part). The working fluid 75 cooled in the low temperature part condenses and returns to a liquid state, is absorbed by the wick 74, and returns to the high temperature part via the wick 74.

[0027] A cylindrical through-hole 42C is formed in the material receiving section 42 for installing a heat pipe 71. The inner portion 71C of the heat pipe 71 extends inside the through-hole 42C. The through-hole 42C has a circular inner surface, and the heat pipe 71 has a circular outer surface. The inner diameter of the through-hole 42C is slightly larger than the outer diameter of the heat pipe 71. The heat pipe 71 is installed inside the through-hole 42C so as to be approximately concentric with the through-hole 42C. A thermally conductive film 76 is interposed between the through-hole 42C and the inner portion 71C. The thermally conductive film 76 is made of, for example, thermally conductive grease and is in contact with both the material receiving section 42 and the inner portion 71C of the heat pipe 71, thermally connecting the inner portion 71C and the material receiving section 42.

[0028] The heat pipe 71 is fixed to the material receiving section 42 by an appropriate method. A detailed explanation is omitted, but for example, the heat pipe 71 can be fitted with a screw and fastened with a nut.

[0029] <Configuration of Heatsink 72> As shown in Figures 3A to 3C, the heat sink 72 is equipped with multiple fins 78. The multiple fins 78 are stacked at intervals from each other along the axial direction (vertical direction Z) of the heat pipe 71. The fins 78 are made of a metal with high thermal conductivity, such as an aluminum alloy. The fins 78 are fixed to the heat pipe 71 by welding or the like.

[0030] <Comparative Example> Figure 5 is a perspective view of the material receiving section 142 of the comparative example. The material receiving section 142 of the comparative example has the same external shape as the material receiving section 42 of this embodiment, and the cavity 142A, material supply hole 142B, and bolt hole 142D are configured in the same way as the cavity 42A, material supply hole 42B, and bolt hole 42D of this embodiment. Furthermore, the material receiving section 142 is equipped with a cooling means and is functionally the same as the material receiving section 42 of this embodiment.

[0031] As a cooling means, an internal flow path 201 is formed inside the material receiving section 142 through which cooling water flows. The internal flow path 201 is connected to an external flow path 202 of the cooling water. The external flow path 202 is equipped with a pump 203 and a heat exchanger 204. The cooling water, which has been heated by cooling the material receiving section 142, is cooled in the heat exchanger 204 by chilled water supplied from the chiller 205. Since the material receiving section 142 is movable in the axial direction X together with the cylinder 32, the external flow path 202 is made of a material that is easily deformable, such as a rubber hose.

[0032] The internal flow path 201 is configured in a three-dimensional manner. This allows for uniform cooling of the material receiving section 142. Furthermore, the cooling water inlet 206 and outlet 207 can each be combined into a single inlet, preventing the routing of the external flow path 202 from becoming complicated.

[0033] However, the material receiving section 142 of the comparative example has the following problems. First, the hardness components contained in the cooling water can cause limescale (calcium hypochlorite) to accumulate in the cooling water flow paths (internal flow path 201 and external flow path 202). Also, electrolytic corrosion can occur in the cooling water flow paths. For this reason, periodic cleaning of the flow paths is necessary, but the internal flow path 201 in particular has a three-dimensional shape, making cleaning difficult. In order to clean it, it is also necessary to remove the material receiving section 142 from the cylinder 32.

[0034] <Effects of this embodiment> In contrast, this embodiment does not use cooling water. Since the inside of the heat pipe 71 has a sealed structure, there is little possibility of foreign matter entering, and cleaning is basically unnecessary. Therefore, the material receiving mechanism 7 of this embodiment is almost maintenance-free.

[0035] Next, the material receiving section 142 of the comparative example requires complex machining to form a three-dimensional flow channel. The material receiving section 142 is a casting, but it is difficult to form a complex flow channel during the manufacturing of the casting. Therefore, it is necessary to machine the casting, which does not have a flow channel, to form a three-dimensional flow channel. However, in order to form a three-dimensional flow channel, it is necessary to combine multiple straight sections, which requires multiple machining operations. Furthermore, in straight sections on the outer surface of the casting that do not have an opening, it is necessary to drill from the outer surface of the casting and then plug the outer surface with a plug (for example, plug 208). In contrast, in this embodiment, since the through hole 42C is straight, machining is easy.

[0036] Furthermore, in this embodiment, since there is no need to use cooling water for cooling, the external flow path 202, pump 203, heat exchanger 204, chiller 205, etc., are also unnecessary. Therefore, maintenance of these devices is also unnecessary in this embodiment.

[0037] Furthermore, in the case of a water-cooling system like the comparative example, the cooling performance of the material receiving section 142 is mainly determined by the thermal conductivity of water. In contrast, the thermal conductivity of the heat pipe 71 is at least several tens of times higher than that of water, so this embodiment is also advantageous in terms of cooling performance. In other words, in the case of the comparative example, in order to ensure cooling performance, it is desirable to arrange the internal flow path 201 three-dimensionally so as to surround the cavity 142A of the material receiving section 142. In contrast, in this embodiment, a simple linear heat pipe 71 is sufficient.

[0038] To elaborate on this point, since the material receiving sections 42 and 142 are adjacent to the cylinder body 41, overcooling of the material receiving sections 42 and 142 can lead to cooling of the cylinder body 41, which in turn can lead to an increase in the power consumption of the heater 43. Therefore, it is desirable that the cooling performance of the material receiving sections 42 and 142 minimizes its impact on the cylinder body 41, and excessive cooling performance is undesirable. From this viewpoint, it is not necessary to arrange the heat pipe 71 three-dimensionally to surround the cavity 141A of the material receiving section 142, as in the comparative example, and a simple linear heat pipe 71 is preferable.

[0039] In the comparative example, the cooling water inlet 206 and outlet 207 are each combined into a single three-dimensional flow path. It is undesirable to have a complex branching structure in the cooling water flow path, and the degree of freedom in flow path selection is not very high.

[0040] In contrast, this embodiment offers greater flexibility in the placement of the heat pipe 71. In this embodiment, the heat pipe 71 extends downward from the lower surface of the material receiving section 42, but it may also extend upward from the upper surface of the material receiving section 42, or extend laterally (horizontally) from the side of the material receiving section 42. This is because, as the cylinder 32 rotates, the temperature distribution of the material receiving section 42 becomes almost uniform when cooling is not performed. In other words, the cooling location of the material receiving section 42 (the placement of the heat pipe 71) is not subject to significant constraints from the viewpoint of cooling performance.

[0041] The heat pipes 71 and heat sink 72 can be standard off-the-shelf components. In particular, heat pipes 71 are commercially available in various outer diameters, allowing for easy adjustment of cooling performance by selecting the outer diameter, installation position, number of pipes, etc.

[0042] (Second embodiment) Figure 6 is a front view of the injection device 3 of the injection molding machine 1 according to the second embodiment of the present invention, similar to Figure 2A. Here, we will mainly explain the differences from the first embodiment. Configurations and effects that are not explained are the same as in the first embodiment.

[0043] The outer portion 71D of the heat pipe 71 has a connecting portion 71E connected to the inner portion 71C (see Figures 3B and 3C), and a heat sink support portion 71F connected to the connecting portion 71E and supporting the heat sink 72. The heat sink support portion 71F extends in a different direction from the connecting portion 71E (axial direction X in this embodiment). The heat pipe 71 is made of copper or a copper alloy and is easy to bend, so it is easy to bend it in the middle as in this embodiment. The heat sink 72 is housed in the cover 35, and the blower 63 cools the heat sink 72.

[0044] By directing airflow onto the heatsink 72, the cooling efficiency of the heatsink 72 can be further improved. Since the existing blower 63 is utilized, there is no need to install a new blower. Furthermore, since the heatsink 72 is covered by the cover 35 and cannot be seen from the outside, it is also aesthetically pleasing.

[0045] (Note) This specification includes the following disclosures. [Configuration 1] A material receiving section that receives the material supplied to the injection molding machine, At least one heat pipe thermally connected to the material receiving section, At least one heat sink thermally connected to the at least one heat pipe, A material receiving mechanism for an injection molding machine having the following features. [Configuration 2] The at least one heat pipe has an internal portion located inside the material receiving section and an external portion located outside the material receiving section. The material receiving mechanism according to configuration 1, wherein the at least one heat sink is connected to the external portion of the at least one heat pipe. [Configuration 3] The aforementioned internal portion extends inside the through hole of the material receiving portion, The material receiving mechanism according to configuration 2, having a thermally conductive film interposed between the through hole and the internal portion of the material receiving portion, in contact with the material receiving portion and the internal portion, and thermally connecting the material receiving portion and the internal portion. [Structure 4] The material receiving mechanism according to configuration 2 or 3, wherein the internal portion of at least one heat pipe extends linearly inside the material receiving section. [Composition 5] The material receiving mechanism according to any one of configurations 1 to 4, wherein the at least one heat pipe includes a plurality of heat pipes. [Composition 6] It comprises a clamping device for clamping the mold and an injection device for melting and injecting the material, The injection device is an injection molding machine having a material receiving mechanism as described in any one of configurations 1 to 5. [Composition 7] The injection molding machine according to configuration 6, wherein the injection device comprises a screw and a cylinder, the cylinder comprises a cylinder body and a material receiving section, the cylinder body and the material receiving section house the screw, the cylinder body is equipped with a heater, and the material receiving section is a component independent of the cylinder body. [Structure 8] The injection device comprises a heating element, a blower for cooling the heating element, and a cover for housing the heating element and the blower. The injection molding machine according to configuration 6 or 7, wherein the heat sink is housed in the cover, and the blower cools the heat sink. [Composition 9] The injection molding machine according to configuration 8, wherein the external portion of at least one heat pipe has a connecting portion connected to the internal portion and a heat sink support portion connected to the connecting portion and supporting the heat sink, the heat sink support portion extending in a direction different from the connecting portion and housed in the cover. [Configuration 10] The injection molding machine according to configuration 8 or 9, wherein the heating element includes a motor and a ball screw for driving the injection device. [Composition 11] The injection molding machine according to configuration 6 or 7, wherein at least one of the heat pipes extends linearly along its entire length. [Method 1] A cooling method for an injection molding machine, comprising the following steps: (a) The process of receiving the material supplied to the injection molding machine in the material receiving section: (b) A step of heating and melting the material received in the material receiving section inside the injection molding machine: and (c) A step of cooling the material receiving section with at least one heat pipe thermally connected to the material receiving section and at least one heat sink thermally connected to the at least one heat pipe. [Explanation of Symbols]

[0046] 1 injection molding machine 2 Mold clamping device 3 Injection device 7. Material receiving mechanism 32 liters 33 Screw 35 Cover 36 Material receiving section 41 Cylinder body 42 Material receiving section 42B through hole 43 Heater 56 Plasticizing motor (heat-generating part) 58 Ball screw (heating element) 61 Injection motor (heating element) 63 Blower 71 Heat Pipe 71C internal part 71D External part 71E Connection part 71F Heatsink Support Section 72 Heatsink 76 Thermally conductive film

Claims

1. A clamping device for clamping a mold, and an injection device for melting and injecting material, The injection device comprises a material receiving mechanism, a heating element, a blower for cooling the heating element, and a cover for housing the heating element and the blower. The aforementioned material receiving mechanism is A material receiving section for receiving the aforementioned material, At least one heat pipe thermally connected to the material receiving section, At least one heat sink thermally connected to the at least one heat pipe, It has, The at least one heat sink is housed in the cover, and the blower cools the at least one heat sink. An injection molding machine wherein the external portion of at least one heat pipe located outside the material receiving portion has a connecting portion connected to an internal portion located inside the material receiving portion, and a heat sink support portion connected to the connecting portion and supporting the at least one heat sink, the heat sink support portion extending in a direction different from the connecting portion and housed in the cover.

2. The invention comprises a mold clamping device for clamping the mold and an injection device for melting and injecting the material, The injection device comprises a material receiving mechanism, a heating element, a blower for cooling the heating element, and a cover for housing the heating element and the blower. The aforementioned material receiving mechanism is A material receiving section for receiving the aforementioned material, At least one heat pipe thermally connected to the material receiving section, At least one heat sink thermally connected to the at least one heat pipe, It has, The at least one heat sink is housed in the cover, and the blower cools the at least one heat sink. The heat-generating section includes a motor and a ball screw for driving the injection device, in an injection molding machine.

3. The injection molding machine according to claim 1, wherein the at least one heat sink is connected to the external portion of the at least one heat pipe.

4. The at least one heat pipe has an internal portion located inside the material receiving portion and an external portion located outside the material receiving portion, The injection molding machine according to claim 2, wherein the at least one heat sink is connected to the external portion of the at least one heat pipe.

5. The aforementioned internal portion extends inside the through hole of the material receiving portion, The injection molding machine according to claim 3 or 4, further comprising a thermally conductive film interposed between the through hole and the internal portion of the material receiving portion, in contact with the material receiving portion and the internal portion, and thermally connecting the material receiving portion and the internal portion.

6. The injection molding machine according to claim 3 or 4, wherein the internal portion of at least one heat pipe extends linearly inside the material receiving section.

7. The injection molding machine according to claim 1 or 2, wherein the at least one heat pipe includes a plurality of heat pipes.

8. The injection molding machine according to claim 1 or 2, wherein the injection device comprises a screw and a cylinder, the cylinder comprises a cylinder body and a material receiving section, the cylinder body and the material receiving section house the screw, the cylinder body is equipped with a heater, and the material receiving section is a member independent of the cylinder body.

9. The injection molding machine according to claim 2, wherein at least one of the heat pipes extends linearly along its entire length.

10. A clamping device for clamping a mold, and an injection device for melting and injecting material, The injection device comprises a material receiving mechanism, a heating element, a blower for cooling the heating element, and a cover for housing the heating element and the blower. The aforementioned material receiving mechanism is A material receiving section for receiving the aforementioned material, At least one heat pipe thermally connected to the material receiving section, At least one heat sink thermally connected to the at least one heat pipe, It has, The at least one heat sink is housed in the cover, and the blower cools the at least one heat sink. A cooling method for an injection molding machine comprising the following steps in an injection molding machine in which at least one heat pipe has an external portion located outside the material receiving portion that is connected to an internal portion located inside the material receiving portion, and a heat sink support portion connected to the connection portion that supports at least one heat sink, wherein the heat sink support portion extends in a direction different from the connection portion and is housed in the cover: (a) Step of receiving the material in the material receiving section: (b) A step of heating and melting the material received in the material receiving section inside the injection molding machine: and (c) A step of cooling the material receiving section with the at least one heat pipe and the at least one heat sink.

11. A clamping device for clamping a mold, and an injection device for melting and injecting material, The injection device comprises a material receiving mechanism, a heating element, a blower for cooling the heating element, and a cover for housing the heating element and the blower. The aforementioned material receiving mechanism is A material receiving section for receiving the aforementioned material, At least one heat pipe thermally connected to the material receiving section, At least one heat sink thermally connected to the at least one heat pipe, It has, The at least one heat sink is housed in the cover, and the blower cools the at least one heat sink. The aforementioned heating element is an injection molding machine that includes a motor and a ball screw for driving the injection device, and the method for cooling the injection molding machine comprises the following steps: (a) Step of receiving the material in the material receiving section: (b) A step of heating and melting the material received in the material receiving section inside the injection molding machine: and (c) A step of cooling the material receiving section with the at least one heat pipe and the at least one heat sink.

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