Heat cover for injection molding machine and injection molding machine

Abstract

The goal of this thermal cover for an injection molding machine is to simplify the structure without compromising cooling performance and to further improve practicality. This thermal cover is mounted on a heating cylinder that injects molding material from a tip towards a mold and comprises: an inner thermal cover located outside the heating cylinder; and an outer thermal cover located outside the inner thermal cover. The rear end of the inner thermal cover has an outlet between itself and a cooling unit provided at the rear end of the heating cylinder. This outlet directs a portion of the high-temperature gas generated around the heating cylinder to the rear end of the outer thermal cover.The outer heat cover has a perforated region on a side closer to the mold and a non-perforated region on a side closer to the cooling unit.

Description

TECHNICAL AREA

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

[0002] An injection molding machine is equipped with a heat shield that covers a heating cylinder. The heat shield is provided to protect a worker from the heat generated by the heating cylinder. Therefore, it is necessary to reduce the surface temperature as much as possible. Accordingly, measures such as enlarging the heat shield, thickening the heat shield, and coating it with a heat-dissipating paint have been implemented to date.

[0003] Furthermore, there are proposals to use a three-layer structure for a heat cover and to provide a plurality of heat-dissipating holes in a section of the heat cover (see patent document 1).

[0004] Furthermore, there is a proposal to provide a discharge cover with a drain connection above a drain flow channel on a front end (a fixed mounting plate side) of a heating cylinder (see patent document 2). List of references Patent document Patent document 1: Unexamined Japanese patent application, publication no. 2018-1713 Patent document 2: Unexamined Japanese patent application, publication no. 2020-100071 DISCLOSURE OF THE INVENTION Problems to be solved by the invention

[0005] However, if measures such as increasing the size of the heat cover, thickening it, coating it with a heat-dissipating paint, or applying a three-layer structure to the heat cover as described in patent document 1 are taken to reduce its surface temperature, the cost or weight increases. Increased weight of a heat cover impairs its ease of use, particularly during the assembly of the injection molding machine or during maintenance or inspection.

[0006] Furthermore, in a case where a discharge cover, as described in patent document 2, is provided on the front end of a heating cylinder, the temperature of hot air (a high-temperature gas) at the front end of the heating cylinder is likely to decrease. However, no effect of using the discharge cover to lower the temperature of hot air at the rear end of the heating cylinder is to be expected.

[0007] Accordingly, the aim for a heat cover for an injection molding machine and an injection molding machine equipped with the same is to simplify the structure without affecting the cooling performance and to further improve ease of use. Means to solve the problems

[0008] A heat cover, which is for an injection molding machine and is according to the present disclosure, is mounted on a heating cylinder which injects a molding material from a tip towards a mold, wherein the heat cover is provided with: an inner heat cover arranged outside the heating cylinder; and an outer heat cover arranged outside the inner heat cover, wherein a rear end of the inner heat cover, between the rear end of the inner heat cover and a cooling unit provided at a rear end of the heating cylinder, has an outlet area for directing a portion of a high-temperature gas generated around the heating cylinder to a rear end of the outer heat cover, and the outer heat cover has a perforated region on a side closer to the mold and a non-perforated region on a side closer to the cooling unit.

[0009] Furthermore, an injection molding machine according to the present disclosure is provided with: a mold; a mold clamping device configured to open, close, and clamp the mold; an injection device comprising a heating cylinder that injects a molding material from a tip toward the mold; and the cover described above, which is for an injection molding machine and is mounted on the heating cylinder. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic diagram of an injection molding machine 1 according to a first embodiment; Fig. Figure 2 is a perspective exploded view of an injection device 4 according to the first embodiment; Fig. Figure 3 is a perspective view of the injection device 4 according to the first embodiment; Fig. Figure 4 is a perspective view illustrating an internal configuration of the injection device 4 according to the first embodiment; Fig. 5 is a view in which the in Fig. 3 illustrated injection device 4 viewed from the front end; Fig. Figure 6 is a view describing a heat dissipation function of heat covers according to the first embodiment; Fig. Figure 7 is a perspective view illustrating an internal configuration of an injection device 4 according to a second embodiment; Fig. Figure 8 is a perspective view illustrating an internal configuration of an injection device 4 according to a third embodiment; Fig. Figure 9 is a cross-sectional view illustrating an internal configuration of an injection device 4 according to a fourth embodiment; Fig. Figure 10 is a perspective partial view illustrating the rear end of heat covers according to the fourth embodiment; Fig. 11 is a view in which the in Fig. 9 illustrated injection device 4 viewed from the front end; Fig. Figure 12 is a perspective partial view illustrating the rear end of heat covers according to the fourth embodiment; Fig. Figure 13 is a perspective view illustrating an internal configuration of an injection device 4 according to a fifth embodiment; Fig. 14 is a view in which the in Fig. 13 illustrated injection device 4 viewed from the front end; Fig. Figure 15 is a perspective view illustrating an internal configuration of an injection device 4 according to a sixth embodiment; Fig. 16 is a view in which the in Fig. 15 illustrated injection device 4 viewed from the front end; Fig. Figure 17 is a perspective view illustrating an injection device 4 according to a seventh embodiment; Fig. Figure 18 is a perspective view illustrating an internal configuration of the injection device 4 according to the seventh embodiment; Fig. Figure 19 is a view describing a heat dissipation function of a first outer heat cover 40 according to the seventh embodiment; and Fig. Figure 20 is a perspective view illustrating an injection device 4 according to a ninth embodiment. PREFERRED OPERATING MODE FOR REALIZING THE INVENTION

[0010] The following is a description of embodiments of a heat cover for an injection molding machine and of an injection molding machine according to the present disclosure. The drawings accompanying this patent specification are all schematic views. For the sake of clarity, among other things, the shape, scale, length-to-width ratio, or similar features of each area are altered or exaggerated in relation to a real object. Furthermore, hatching indicating a cross-section of a component may be omitted from the drawings.

[0011] In the drawings accompanying this patent specification, a direction parallel to a direction in Fig. The central axis OA of a heating cylinder 10, as illustrated in Figure 2, is defined as the X-direction (which may subsequently be referred to as the "axial direction X"). Within the axial direction X, a forward direction (front end), which serves as the direction in which the heating cylinder 10 moves forward and backward, is defined as X1, and a reverse direction (rear end) is defined as X2. A vertical direction, orthogonal to the axial direction X, is defined as the top-down direction Y. Within the top-down direction Y, the upward direction (top) is defined as Y1, and the downward direction (bottom) is defined as Y2. A horizontal direction, orthogonal to the axial direction X, is defined as the lateral direction Z. Within the lateral direction Z, the rightward direction when viewed from the front X1 is defined as Z1, and the leftward direction is defined as Z2. Furthermore, in the present patent specification, the “... direction” may be referred to as the “... side”. (First embodiment)

[0012] Fig. Figure 1 is a schematic diagram of an injection molding machine 1 according to a first embodiment. Fig. Figure 2 is a perspective exploded view of an injection device 4 according to the first embodiment. Fig. Figure 3 is a perspective view of the injection device 4 according to the first embodiment. Fig. Figure 4 is a perspective view illustrating an internal configuration of the injection device 4 according to the first embodiment. Fig. 5 is a view in which the in Fig. 3 illustrated injection device 4 viewed from the front end. Fig. Figure 6 is a view describing a heat dissipation function of heat covers according to the first embodiment. Fig. 4 and Fig. Figure 6 merely illustrates a left half (region on the left side Z2 from the central axis OA) of the heat cover, cut along an XY plane which includes the central axis OA.

[0013] As in Fig. Figure 1 illustrates the main configuration as the injection molding machine 1, equipped with a mold 2, a mold clamping device 3, and the injection unit 4. The injection molding machine 1 is also equipped, for example, with peripheral devices such as a robot for removing a molded product from the mold or a robot for inserting a component into the mold; however, these are not shown in Figure 1. Fig. 1. Furthermore, in Fig. 1 An illustration of heat covers (described below) provided to the injection device 4.

[0014] Mold 2 is provided with a fixed form 2a and a movable form 2b. The fixed form 2a has, for example, a recessed area on a mold surface. The fixed form 2a is fixed in a specific position. The movable form 2b has, for example, a protruding area on a mold surface. The movable form 2b is connected to the mold clamping device 3 and is mounted in such a way that it allows movement along the axial direction X. The mold clamping device 3 opens and closes and clamps the mold 2. The injection device 4 injects molten molding material into the closed mold 2. The injection device 4 is configured to be able to move along the axial direction X.

[0015] As in Fig. Figure 2 illustrates the injection device 4 with a heating cylinder 10 and a cooling unit 20. Furthermore, as described below, the injection device 4 can be provided with an inner heat cover 30, a first outer heat cover 40, and a second outer heat cover 50 as heat covers (heat covers for an injection molding machine). It should be noted that in Fig. 2 to Fig. 4 of the configuration of the injection device 4 is an illustration only for configurations of the heat covers, the heating cylinder 10 and the cooling unit 20.

[0016] The heating cylinder 10 is a device that injects molten molding material (a resin) from a nozzle 10a at a tip towards the mold. The heating cylinder 10 is provided with a cylinder body 11 and a heating device 12. The cylinder body 11 is essentially a cylindrical section that provides a passage for molding material fed into it as it moves in the forward direction X1. A flow path (not shown) for directing the molten molding material into the mold 2 is provided within the cylinder body 11. The heating device 12 is a heating element for melting molding material that has been filled into it. A plurality of heating devices 12 are arranged on the outer circumference of the cylinder body 11. For example, each heating device 12 is configured as a belt heating element that generates heat by being supplied with energy from a power source (not shown).It should be noted that the heating device 12 is not limited to a belt heating device and can have any type of configuration, provided that the heating device 12 is able to heat the cylinder body 11.

[0017] The cooling unit 20 is provided on the rear end X2 of the heating cylinder 10. The cooling unit 20 is a cooling device to prevent the heat from a hopper 13 (see Fig. 1) The supplied molding material melts, agglomerates, and solidifies before reaching the interior of the heating cylinder 10. The cooling unit 20 according to the present embodiment is provided with a cooling jacket 21 and a cylinder mounting flange 22. The cooling jacket 21 is a device that circulates a cooling medium within a flow path (not shown) provided therein to cool the rear end X2 of the heating cylinder 10. The cooling jacket 21 is provided with a material supply port 23, which communicates with a material supply port (not shown) in the heating cylinder 10. Granular molding material stored in the hopper 13, which is provided above the cooling jacket 21, is fed into the flow path inside the heating cylinder 10 via the material supply port 23.It should be noted that a cooling fan or the like can be used in the cooling unit 20 instead of the cooling jacket 21. The cylinder mounting flange 22 is a component for attaching the heating cylinder 10 to the cooling unit 20. In a case where the cooling unit 20 has a configuration that is not provided with the cylinder mounting flange 22, a gap 31 (described below), corresponding to an outlet area, is formed between the rear end X2 of the inner heat cover 30 and the cooling jacket 21.

[0018] As in Fig. Figure 3 illustrates the heat covers that surround the heating cylinder 10. The heat covers are provided around the heating cylinder 10, thus protecting a worker from the heat generated by the heating cylinder 10. As shown in Fig. 2 and Fig. Figure 3 illustrates the injection device 4 with the inner heat cover 30, the first outer heat cover 40 and the second outer heat cover 50 as heat covers.

[0019] The inner heat cover 30 is arranged on the outside of the heating cylinder 10. As in Fig. Figure 5 illustrates that the inner heat cover 30 is configured to cover at least the top Y1 of the heating cylinder 10 with respect to the central axis X. Furthermore, as shown in Fig. Figure 4 illustrates the gap (outlet area) 31 between the rear end X2 of the inner heat cover 30 and the cylinder mounting flange 22 (cooling unit 20) in the injection device 4 according to the first embodiment. The gap 31 is an opening for directing a portion of the hot air (a high-temperature gas) generated around the heating cylinder 10 to the rear end X2 of the first outer heat cover 40.

[0020] The length L of the gap 31 in the axial direction X must be suitably determined according to the shapes of the heating cylinder 10, the cooling jacket 21, the heat covers, etc. If the length L of the gap 31 in the axial direction X (see Fig. 4) If the length L of the gap 31 in the axial direction X is too long, hot air exceeding the cooling capacity of a non-perforated region 42 (described below) flows to the first outer heat cover 40. Therefore, the surface of the non-perforated region 42 is likely to reach a high temperature. Conversely, if the length L of the gap 31 in the axial direction X is too short, the amount of hot air flowing to the non-perforated region 42 will be small. Therefore, the cooling capacity of the non-perforated region 42 cannot be fully utilized. The length L of the gap 31 in the axial direction X depends on the shape of the heating cylinder 10, the cooling jacket 21, the heat covers, and the like, as described above, but is, for example, equal to or greater than 5 mm and equal to or less than 10% of the length of the first outer heat cover 40 in the X direction.

[0021] As in Fig. As illustrated in Figure 5, the first outer heat cover 40 is arranged outside the inner heat cover 30 on the top surface Y1 of the heating cylinder 10. The first outer heat cover 40 is configured to cover at least the top surface Y1 of the heating cylinder 10 with respect to the central axis X. The second outer heat cover 50 is arranged outside the heating cylinder 10 on the bottom surface Y2 of the heating cylinder 10. The second outer heat cover 50 is configured to cover at least the bottom surface Y2 of the heating cylinder 10 with respect to the central axis X. Accordingly, as shown in Fig. Figure 5 illustrates the outer circumference of the heating cylinder 10, covered by the first outer heat cover 40 and the second outer heat cover 50. In the top-bottom direction Y, the first outer heat cover 40 and the second outer heat cover 50 can be connected in an abutting state or in an overlapping state. A passage 43 for directing a portion of the hot air generated around the heating cylinder 10 from the rear end X2 to the front end X1 is formed between the inner heat cover 30 and the first outer heat cover 40.

[0022] Hot air generated around the heating cylinder 10 becomes relatively lighter than air around the heat shields due to expansion. The front end X1 of the heat shields is blocked at one point during injection molding. Therefore, some of the hot air moves to the top Y1 of the heating cylinder 10 after flowing to the rear end X2. Hot air that has moved to the top Y1 is blocked at the rear end X2 of the heat shields and thus enters the passage 43 through the gap 31. Hot air that has entered the passage 43 flows within the passage 43 from the rear end X2 towards the front end X1.

[0023] As in Fig. Figure 2 illustrates that the first outer heat cover 40 has a perforated region 41 on the front end X1 (side of form 2: see Figure 2). Fig. 1) on. A plurality of holes 45 are formed in the perforated region 41. The perforated region 41 serves to release hot air, which has been directed from the periphery of the heating cylinder 10 through the gap 31 and the passage 43 to the front end X1, from the plurality of holes 45 to the outside air. The length of the perforated region 41 in the axial direction X depends on the shape of the heating cylinder 10, the heat covers, and the like, as described above, but is, for example, equal to or greater than half the total length of the first outer heat cover 40 and equal to or less than a length that is 50 mm shorter than the total length of the first outer heat cover 40. The ratio between the perforated region 41 and the non-perforated region 42 (described below) in the length of the first outer heat cover 40 in the axial direction X is, for example, equal to or greater than 1:1 and equal to or less than 40:1.Furthermore, the openness ratio of the perforated region 41, for example, is between 1 and 25% per unit area.

[0024] Furthermore, as in Fig. Figure 2 illustrates the first outer heat cover 40, which is the non-perforated region 42 on the rear end X2 (side of the cooling unit 20). The non-perforated region 42 comes into contact with hot air that is directed from the periphery of the heating cylinder 10 through the gap 31. In the axial direction X for the first outer heat cover 40, it is desirable that the front end of the non-perforated region 42 is at the same point as the front end of the gap 31 (described below) or further forward (near side) from this position. The entirety of the second outer heat cover 50 (underside Y2) is configured as a non-perforated region. It should be noted that the second outer heat cover 50 can be configured entirely as a non-perforated region or as both a perforated and a non-perforated region.

[0025] As in Fig. Figure 4 illustrates that the rear end X2 of the first outer heat cover 40 and the second outer heat cover 50 are each attached to the cooling unit 20. Furthermore, as shown in Fig. Figure 5 illustrates the inner heat cover 30 and the first outer heat cover 40 connected to each other using a connecting element 44 (for example, a screw, a spacer, or the like). A plurality of connecting elements 44 are arranged along the axial direction X. It should be noted that each connecting element 44 can have any type of configuration, provided that it is possible to connect the inner heat cover 30 and the first outer heat cover 40 appropriately.

[0026] In the heat covers configured as described above, a portion of the hot air generated around the heating cylinder 10 flows along the axial direction X of the heating cylinder 10 to the rear end X2, as shown in Fig. 6 illustrates this. Fig. Figure 6 illustrates a solid arrow a1 conceptually representing a flow of hot air. Hot air that has flowed to the rear end X2 of the heating cylinder 10 is guided through the gap 31 in the upward direction Y1 and flows along the passage 43 in a kind of reversal to the front end X1.

[0027] At this point, the hot air actively comes into contact with the cooling jacket 21 and the cylinder mounting flange 22, and thus heat is extracted from it. Fig. Figure 6 shows wavy arrows a2 conceptually illustrating heat that is extracted from the hot air. Furthermore, the hot air comes into contact with the first outer heat cover 40 when it passes through the non-perforated region 42 of the first outer heat cover 40. At this point, heat exchange occurs between the hot air and the outside air at the non-perforated region 42, and thus heat is extracted from the hot air here as well.

[0028] It should be noted that if a plurality of holes, as in the perforated region 41, are formed in a region corresponding to the non-perforated region 42, the hot air within the inner heat cover 30 is released unchanged through the holes into the outside air. Therefore, the temperature rises in the first outer heat cover 40 near the region corresponding to the non-perforated region 42. However, by providing the non-perforated region 42 in the first outer heat cover 40, as in the present embodiment, heat is extracted from the hot air, and a temperature increase in this region can be prevented.

[0029] Furthermore, the rear end X2 of the first outer heat cover 40 is attached to the cooling unit 20. Accordingly, it is possible to further cool heat that has accumulated in the non-perforated region 42 of the first outer heat cover 40. Additionally, hot air flows along the passage 43 between the inner heat cover 30 and the first outer heat cover 40 to the front end X1. Once the hot air has flowed through the passage 43 to the front end X1, it is discharged from the perforated region 41. The hot air discharged from the perforated region 41 is cooled at the non-perforated region 42. Therefore, it is possible to prevent the temperature near the perforated region 41 of the first outer heat cover 40 from becoming too high. Fig. 6. Dashed arrows a3 conceptually illustrate hot air whose temperature has been reduced. It should be noted that in Fig. 6 and Fig. 18 (described below) the number of arrows a2, which indicate heat from which hot air is extracted, and arrows a3, which indicate hot air whose temperature is reduced, has been conveniently abbreviated for better understanding of the figures.

[0030] As described above, the heat covers according to the first embodiment allow for a simplified structure without compromising cooling performance. Consequently, for the heat covers and the injection molding machine equipped with them according to the first embodiment, it is possible to prevent cost increases and weight gains. Furthermore, the heat covers according to the first embodiment and the injection molding machine 1 equipped with them prevent an increase in the weight of the heat covers. Therefore, it is possible to further improve ease of use, particularly during the assembly of the injection molding machine 1 or during maintenance or inspection of the injection molding machine 1. (Second embodiment)

[0031] The shape of an outlet area for heat covers according to a second embodiment differs from that in the first embodiment. In an injection device 4 according to the second embodiment, other configurations are the same as in the first embodiment. Accordingly, the following are described Fig. Figure 7 only illustrates the rear end faces of the injection device 4 and the heat shields, and an illustration of the entire injection molding machine 1 is omitted. Furthermore, in the description and drawings for the second embodiment, the same reference numerals as in the first embodiment are added to links or the like, which are equivalent to those in the first embodiment, thus eliminating the need for duplicate descriptions.

[0032] Fig. Figure 7 is a perspective view illustrating an internal configuration of the injection device 4 according to the second embodiment. Fig. 7 corresponds Fig. 4 for the first embodiment. Of heat covers that are cut along an XY plane which has the central axis OA in Fig. Figure 7 (enlarged partial view) includes a hole 32 (described below) which is present on the right half on the near side (region on the right side Z1 from the central axis OA), indicated by imaginary lines.

[0033] In the injection device 4 according to the second embodiment as in Fig. Figure 7 illustrates the hole 32 provided at the rear end X2 of the inner heat cover 30. The hole 32 is an opening for directing a portion of the hot air (a high-temperature gas) generated around the heating cylinder 10 to the rear end 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 lateral direction Z must be suitably determined according to the shapes of the heating cylinder 10, the cooling jacket 21, the heat covers, etc.

[0034] If the opening area (L1 × L2) of the hole 32 is too large, hot air exceeding the cooling capacity of an unperforated region 42 flows to the first outer heat cover 40. Therefore, the surface of the unperforated region 42 is likely to reach a high temperature. Conversely, if the opening area of ​​the hole 32 is too small, the amount of hot air flowing to the unperforated region 42 will be low. Therefore, the cooling capacity of the unperforated region 42 cannot be fully utilized.The length L1 of the hole 32 in the axial direction X and the length L2 of the hole 32 in the lateral direction Z depend on the shape of the heating cylinder 10, the cooling jacket 21, the heat covers and the like, which are described above, but the length L1 is equal to or greater than 5 mm and equal to or less than 10% of the length of the first outer heat cover 40 in the X direction and the length L2 is equal to or greater than 5 mm and equal to or less than the length of the inner heat cover 30 in the Z direction.

[0035] For heat covers according to the second embodiment, the hole 32 provided in the inner heat cover 30 has a function equivalent to that of the gap 31 (see Fig. 4) in the case of the heat covers according to the first embodiment. Accordingly, by using heat covers and an injection molding machine equipped with them according to the second embodiment, it is possible to simplify the structure without affecting the cooling performance, and it is possible to further improve the ease of operation. (Third embodiment)

[0036] The shape of an outlet area for heat covers according to a third embodiment differs from that in the first embodiment. In an injection device 4 according to the third embodiment, other configurations are the same as in the first embodiment. Accordingly, the following are described Fig. Figure 8 only illustrates the rear end faces of the injection device 4 and the heat covers, and an illustration of the entire injection molding machine 1 is omitted. Furthermore, in the description and drawings for the third embodiment, the same reference numerals as in the first embodiment are added to links or the like, which are equivalent to those in the first embodiment, thus eliminating the need for duplicate descriptions.

[0037] Fig. Figure 8 is a perspective view illustrating an internal configuration of the injection device 4 according to the third embodiment. It shows heat covers cut along an XY plane, which defines the central axis OA. Fig. Figure 8 (enlarged partial view) includes a recess 33 (described below) which is present on the right half on the near side (region on the right side Z1 from the central axis OA), indicated by imaginary lines.

[0038] In the injection device 4 according to the second embodiment as in Fig. Figure 8 illustrates the recess 33 provided at the rear end X2 of the inner heat cover 30. The recess 33 is an opening for directing a portion of the hot air (a high-temperature gas) generated around the heating cylinder 10 to the rear end X2 of the first outer heat cover 40. The length L3 of the recess 33 in the axial direction X and the length L4 of the recess 33 in the lateral direction Z must be suitably determined according to the shapes of the heating cylinder 10, the cooling jacket 21, the heat covers, etc.

[0039] If the opening area (L3 × L4) of the recess 33 is too large, hot air exceeding the cooling capacity of a non-perforated region (described below) flows to the first outer heat cover 40. Therefore, the surface of the non-perforated region is likely to reach a high temperature. Conversely, if the opening area of ​​the recess 33 is too small, the amount of hot air flowing to the non-perforated region will be low. Therefore, the cooling capacity of the non-perforated region cannot be fully utilized.The length L3 of the recess 33 in the axial direction X and the length L4 of the recess 33 in the width direction Z depend on the shape of the heating cylinder 10, the cooling jacket 21, the heat covers and the like, which are described above; however, for example, the length L3 is equal to or greater than 5 mm and equal to or less than 10% of the length of the first outer heat cover 40 in the X direction, and the length L4 is equal to or greater than 5 mm and equal to or less than the length of the inner heat cover 30 in the Z direction.

[0040] For heat covers according to the third embodiment, the recess 33 provided in the inner heat cover 30 functions equivalently to the gap 31 with respect to hot air that arises around the heating cylinder 10 (see Fig. 4) in the case of the heat covers according to the first embodiment. Accordingly, by using heat covers and an injection molding machine equipped with them according to the third embodiment, it is possible to simplify the structure without affecting the cooling performance, and it is possible to further improve ease of operation. (Fourth embodiment)

[0041] Heat covers according to a fourth embodiment differ from those of the first embodiment in that the inner heat cover 30 is provided with a separating plate 60. In an injection device 4 according to the fourth embodiment, other configurations are the same as in the first embodiment. Accordingly, only the rear end faces of the injection device 4 and the heat covers are illustrated in each figure, and an illustration of the entire injection molding machine 1 is omitted. Furthermore, in the description and drawings for the fourth embodiment, the same reference numerals are added to links or the like as in the first embodiment, which are equivalent to those in the first embodiment, thus eliminating the need for duplicate descriptions.

[0042] Fig. Figure 9 is a cross-sectional view illustrating an internal configuration of the injection device 4 according to the fourth embodiment. Fig. Figure 10 is a perspective partial view illustrating the rear end of heat covers according to the fourth embodiment. Fig. 11 is a view in which the in Fig. 9 illustrated injection device 4 viewed from the front end. Fig. Figure 12 is a perspective partial view illustrating the rear end of heat covers according to the fourth embodiment. Fig. 9, Fig. 10 and Fig. Figure 12 merely illustrates a left half (region on the left side Z2 from the central axis OA) of the heat cover, cut along an XY plane which includes the central axis OA.

[0043] In the injection device 4 according to the fourth embodiment as in Fig. Figure 9 illustrates the partition plate 60 being provided at the rear end of the inner heat cover 30. The partition plate 60 is a component for limiting the flow rate at which a portion of the hot air generated around the heating cylinder 10 moves from the gap 31 to the rear end X2 of the first outer heat cover 40. As shown in Fig. 10 and Fig. Figure 11 illustrates how the partition plate 60 is configured to cover between the inner heat cover 30 and a section of the outer circumference of the heating cylinder 10 on the top side Y1 of the central axis X of the heating cylinder 10. A gap 61 is also provided between the partition plate 60 and the heating cylinder 10.

[0044] If the gap 61 between the partition plate 60 and the heating cylinder 10 is blocked, most of the hot air generated around the heating cylinder 10 flows to the front end X1 of the heating cylinder 10. As a result, the temperature of an exhaust cover (not shown) provided on the front end X1 of the heating cylinder 10 increases. However, if the gap 61 between the partition plate 60 and the heating cylinder 10 is provided, some of the hot air generated around the heating cylinder 10 can be directed to the rear end X2 of the first outer heat cover 40. As shown in Fig. Figure 11 illustrates that a distance s of the gap 61 between the partition plate 60 and the heating cylinder 10 is conveniently defined, making it possible to adjust the flow rate at which hot air passes between the partition plate 60 and the heating cylinder 10. The distance s depends on the shape of the heating cylinder 10, the heat shields, and the like, as described above, but is, for example, equal to or greater than 5 mm and equal to or less than 75 mm.

[0045] Analogous to the heat covers according to the first embodiment, the heat covers according to the fourth embodiment have a gap 31 between the inner heat cover 30 and the cylinder mounting flange 22 (cooling unit 20). Accordingly, with heat covers and an injection molding machine equipped with them according to the fourth embodiment, it is possible to simplify the structure without impairing the cooling performance, and it is possible to further improve ease of operation.

[0046] Furthermore, according to the fourth embodiment, the heat covers are provided with the separating plate 60 at the rear end X2 of the inner heat cover 30. Therefore, it is possible to prevent more hot air than necessary from flowing from the rear end X2 of the heating cylinder 10 to the cooling jacket 21. Accordingly, it is possible to minimize the effect on the temperature adjustment function of the cooling jacket 21. It is also possible to prevent a defect in which hot air, which reduces the cooling capacity of the non-perforated region 42 of the first outer heat cover 40 (see figure), Fig. 10) exceeds, to which it flows into the non-perforated region 42, causing the surface temperature to rise and the cooling capacity to be exceeded.

[0047] Furthermore, it comes as in Fig. Figure 12 illustrates on the front face X1 of the cylinder mounting flange 22 cases in which bolt heads 24 protrude on the front face X1 for fastening the cylinder mounting flange 22 to the cooling jacket 21. When the bolt heads 24 protrude on the cylinder mounting flange 22, it can be difficult to determine the size of the gap 31 (length L: see figure) due to the shape of the inner heat cover 30. Fig. 4) to adapt appropriately. As with the heat covers according to the fourth embodiment, however, the separating plate 60 is provided at the rear end of the inner heat cover 30 and the distance s (see Fig. 11) is conveniently positioned between the separating plate 60 and the heating cylinder 10, making it possible to conveniently adjust the size of a section for the release of hot air. (Fifth embodiment)

[0048] Heat covers according to a fifth embodiment have a configuration of a separating plate 60 that differs from that in the fourth embodiment. For heat covers according to the fifth embodiment, other configurations are the same as in the fourth embodiment. Accordingly, only the rear end faces of the injection device 4 and the heat covers are illustrated in each figure, and an illustration of the entire injection molding machine 1 is omitted. Furthermore, in the description and drawings for the fifth embodiment, the same reference numerals are added to links or the like as in the fourth embodiment, which are equivalent to those in the fourth embodiment, thus eliminating the need for duplicate descriptions.

[0049] Fig. Figure 13 is a perspective view illustrating an internal configuration of an injection device 4 according to the fifth embodiment. Fig. 14 is a view in which the in Fig. Figure 13 illustrates the injection device 4 viewed from the front end. Fig. Figure 13 illustrates only the left half (region on the left side Z2 of the central axis OA) of the heat shields, which are sectioned along an XY plane that includes the central axis OA. It should be noted that the fifth and sixth embodiments (described below) provide examples of the use of a cylinder mounting flange 22 with bolt heads 24, which are the same as those in the fourth embodiment.

[0050] In the injection device 4 according to the fifth embodiment as in Fig. Figure 13 illustrates a plurality of holes 62 provided in the partition plate 60 for the inner heat cover 30. The holes 62 are openings for directing a portion of the hot air generated around the heating cylinder 10 to the rear end X2 of the first outer heat cover 40. As shown in Fig. Figure 14 illustrates the plurality of holes 62 provided in the partition plate 60, arranged substantially uniformly along the outer circumference of the heating cylinder 10. In the partition plate 60 according to the fifth embodiment, the plurality of recesses 62 are present, serving as openings. Therefore, no gap is formed between the partition plate 60 and the heating cylinder 10.

[0051] The diameter of each hole 62 provided in the partition plate 60 depends on the shape of the heating cylinder 10, the cooling jacket 21, the heat covers, or the like, but is, for example, equal to or greater than 5 mm and equal to or less than 20 mm. Furthermore, the number of holes 62 arranged is, for example, equal to or greater than 1 and equal to or less than 100.

[0052] For heat covers according to the fifth embodiment, the plurality of holes 62 provided in the partition plate 60 for the inner heat cover 30 function, with respect to the hot air generated around the heating cylinder 10, equivalently to the gap 61 formed between the heating cylinder 10 and the partition plate 60 in the fourth embodiment. Accordingly, by using heat covers and an injection molding machine equipped with them according to the fifth embodiment, it is possible to simplify the structure without impairing the cooling performance, and it is possible to further improve ease of operation. (Sixth embodiment)

[0053] Heat covers according to a sixth embodiment have a separating plate 60 configuration that differs from that in the fourth embodiment. For heat covers according to the sixth embodiment, other configurations are the same as in the fourth embodiment. Accordingly, only the rear end faces of the injection device 4 and the heat covers are illustrated in each figure, and an illustration of the entire injection molding machine 1 is omitted. Furthermore, in the description and drawings for the sixth embodiment, the same reference numerals are added to links or the like as in the fourth embodiment, which are equivalent to those in the fourth embodiment, thus eliminating the need for duplicate descriptions.

[0054] Fig. Figure 15 is a perspective view illustrating an internal configuration of an injection device 4 according to the sixth embodiment. Fig. 16 is a view in which the in Fig. 15 illustrates injection device 4 viewed from the front end. Fig. Figure 15 merely illustrates a left half (region on the left side Z2 from the central axis OA) of the heat cover, which is cut along an XY plane that includes the central axis OA.

[0055] In the injection device 4 according to the sixth embodiment as in Fig. Figure 15 illustrates a plurality of recesses 63 in the partition plate 60 for the inner heat cover 30. Each recess 63 is an opening for directing a portion of the hot air (a high-temperature gas) generated around the heating cylinder 10 to the rear end face X2 of the first outer heat cover 40. As shown in Fig. Figure 16 illustrates the plurality of recesses 63 provided in the partition plate 60, arranged substantially uniformly along the outer circumference of the heating cylinder 10. In the partition plate 60 according to the sixth embodiment, the plurality of recesses 63 are present, serving as openings. Therefore, no gap is formed between the partition plate 60 and the heating cylinder 10.

[0056] A width w (see Fig. 16) The shape of each recess 63 provided in the partition plate 60 depends on the shape of the heating cylinder 10, the cooling jacket 21, the heat covers, or the like, but is, for example, equal to or greater than 5 mm and less than the length of the partition plate 60 in the Z-direction. Furthermore, the height h of the recess 63 (see Fig. 16) for example, equal to or greater than 5 mm and less than the length of the distance between the inner heat cover 30 and the heating cylinder 10. It should be noted that the number of arranged recesses 63 ua is expediently determined according to the width w of each recess 63.

[0057] For heat covers according to the sixth embodiment, the plurality of recesses 63 provided in the partition plate 60 for the inner heat cover 30 function, with respect to hot air generated around the heating cylinder 10, equivalently to the gap 61 formed between the heating cylinder 10 and the partition plate 60 in the fourth embodiment. Accordingly, by using heat covers and an injection molding machine equipped with them according to the sixth embodiment, it is possible to simplify the structure without impairing cooling performance, and it is possible to further improve ease of operation. (Seventh embodiment)

[0058] Heat covers according to a seventh embodiment differ from those according to the first embodiment in that they are provided in a non-perforated region 42 of a first outer heat cover 40 with recesses and projections 46 (described below) that correspond to a cooling element. In an injection device 4 according to the seventh embodiment, other configurations are the same as in the first embodiment. Accordingly, an illustration of the entire injection molding machine 1 is omitted in each drawing. Furthermore, in the description and drawings for the seventh embodiment, the same reference numerals as in the first embodiment are added to links or the like, which are equivalent to those in the first embodiment, and duplicate descriptions are omitted.

[0059] Fig. Figure 17 is a perspective view illustrating an injection device 4 according to the seventh embodiment. Fig. Figure 18 is a view describing a heat dissipation function of a first outer heat cover 40 according to the seventh embodiment. Fig. Figure 18 merely illustrates a left half (region on the left side Z2 from the central axis OA) of the heat cover, cut along an XY plane which includes the central axis OA.

[0060] As in Fig. Figure 17 illustrates that the injection device 4 according to the seventh embodiment is provided on the non-perforated region 42 of the first outer heat cover 40 with the recesses and projections 46, which correspond to a cooling element. The recesses and projections 46 are provided to further promote heat exchange between the outside air and the hot air flowing from the periphery of the heating cylinder 10. As shown in the enlarged partial view in Fig. Figure 17 illustrates the recesses and projections 46 configured according to the present embodiment by sections whose cross-section has a protruding shape and sections whose cross-section has a recessed shape.

[0061] For example, the recesses and protrusions 46 can be produced using press machining to form uneven shapes in the surface of the first outer heat cover 40. By providing the recesses and protrusions 46 for the non-perforated region 42 of the first outer heat cover 40, it is possible to increase the surface area per unit area compared to a case where the non-perforated region 42 is considered a flat surface. It should be noted that, as in Fig. Figure 17 illustrates the recesses and projections 46 with a space (a flat surface) that is open between the recesses and projections 46 and the perforated region 41, or that may be provided adjacent to the perforated region 41.

[0062] Analogous to the heat covers according to the first embodiment, the heat covers according to the seventh embodiment also have a gap 31 between the inner heat cover 30 and the cylinder mounting flange 22 (cooling unit 20). Accordingly, the heat covers and an injection molding machine equipped with them according to the seventh embodiment make it possible to simplify the structure without impairing the cooling performance, and it is possible to further improve ease of operation.

[0063] Furthermore, according to the seventh embodiment, a portion of the hot air generated around the heating cylinder 10 is directed upwards in the direction Y1 through the gap 31 at the rear end X2 of the inner heat cover 30 and passes through the non-perforated region 42 of the first outer heat cover 40, as shown in Fig. Figure 18 illustrates this. Under these circumstances, more heat is extracted from the hot air during heat exchange between the hot air and the outside air, since the non-perforated region 42 is provided with the recesses and projections 46. Accordingly, it is possible to further improve the cooling capacity of the non-perforated region 42 provided in the first outer heat cover 40. (Eighth embodiment)

[0064] Heat covers according to an eighth embodiment differ from those according to the seventh embodiment in that they are provided in a non-perforated region 42 of a first outer heat cover 40 with a heat sink 47 (described below), which corresponds to a cooling element. In an injection device 4 according to the eighth embodiment, other configurations are the same as in the seventh embodiment. Accordingly, an illustration of the entire injection molding machine 1 is omitted in each drawing. Furthermore, in the description and drawings for the eighth embodiment, the same reference numerals are added to links or the like as in the seventh embodiment, which are equivalent to those in the seventh embodiment, and duplicate descriptions are omitted.

[0065] Fig. Figure 19 is a perspective view illustrating the injection device 4 according to the eighth embodiment. As in Fig. Figure 19 illustrates that the injection device 4 according to the eighth embodiment is provided with a heat sink 47, corresponding to a cooling element, at the non-perforated region 42 of the first outer heat cover 40. The heat sink 47 is a heat dissipation device to further promote heat exchange between the ambient air and the hot air flowing from the vicinity of the heating cylinder 10. For example, copper, aluminum, or the like is used as the material for the heat sink 47. By providing the heat sink 47 at the non-perforated region 42 of the first outer heat cover 40, it is possible to increase the surface area per unit area compared to a case where the non-perforated region 42 is considered a flat surface.

[0066] Analogous to the heat covers according to the first embodiment, the heat covers according to the eighth embodiment also have a gap 31 between the inner heat cover 30 and the cylinder mounting flange 22 (cooling unit 20). Accordingly, the heat covers and an injection molding machine equipped with them according to the eighth embodiment make it possible to simplify the structure without impairing the cooling performance, and it is possible to further improve ease of operation.

[0067] Furthermore, according to the eighth embodiment of the heat sink 47, the non-perforated region 42 of the first outer heat cover 40 is provided by the heat covers, thus extracting more heat from the hot air during heat exchange between the hot air and the outside air. Accordingly, it is possible to further improve the cooling capacity of the non-perforated region 42 provided in the first outer heat cover 40. (Ninth embodiment)

[0068] Heat covers according to a ninth embodiment differ from those according to the seventh embodiment in that they are provided in a non-perforated region 42 of a first outer heat cover 40 with a cooling device (described below), which corresponds to a cooling element. In an injection device 4 according to the ninth embodiment, other configurations are the same as in the seventh embodiment. Accordingly, an illustration of the entire injection molding machine 1 is omitted in each drawing. Furthermore, in the description and drawings for the ninth embodiment, the same reference numerals are added to links or the like as in the seventh embodiment, which are equivalent to those in the seventh embodiment, and duplicate descriptions are omitted.

[0069] Fig. Figure 20 is a perspective view of an injection device 4 according to the ninth embodiment. As in Fig. Figure 20 illustrates that the injection device 4 according to the ninth embodiment is provided with a cooling device 48, corresponding to a cooling element, at the non-perforated region 42 of the first outer heat cover 40. The cooling device 48 serves to reduce the temperature of hot air flowing from the vicinity of the heating cylinder 10. For example, the cooling device 48 can be a configuration identical to the cooling jacket 21, or a cooling fan or the like can be used.

[0070] Analogous to the heat covers according to the first embodiment, a gap 31 is also provided between the inner heat cover 30 and the cylinder mounting flange 22 (cooling unit 20) in the heat covers according to the ninth embodiment. Accordingly, the heat covers and an injection molding machine equipped with them according to the ninth embodiment make it possible to simplify the structure without impairing the cooling performance, and it is possible to further improve ease of operation.

[0071] Furthermore, according to the ninth embodiment, the cooling device 48 is provided in the non-perforated region 42 of the first outer heat cover 40 by the heat covers, thus extracting more heat from the hot air flowing through the non-perforated region 42. Accordingly, it is possible to further improve the cooling capacity of the non-perforated region 42 provided in the first outer heat cover 40. (Variants)

[0072] The foregoing describes one embodiment of the present disclosure; however, the present disclosure is not limited to the embodiment described above. These embodiments may be subject to various additions, substitutions, modifications, partial deletions, or the like, within a scope that does not deviate from the core content of the present disclosure or within a scope that does not deviate from the meaning of the present disclosure as set forth in the claims or their equivalents. Furthermore, these embodiments may be used in combination. For example, the sequence of operations or the sequence of processes in the embodiments described above is given as an example, and there is no limitation thereto.

[0073] In the first to third embodiments, the gap 31, the hole 32, and the recess 33, which correspond to an outlet area, can each be used independently of one another or advantageously combined. Furthermore, the shape of the hole 32 is not limited to a circle and can, for example, be a square, an ellipse, a triangle, or a rhombus, or be a shape resulting from deforming or combining a section of a particular shape. The same applies to the recess 33.

[0074] In the fourth to sixth embodiments, the gap 61, the holes 62, and the recesses 63 located in the partition plate 60, corresponding to an outlet area, can each be used independently or advantageously combined. Furthermore, the shape of each hole 62 is not limited to a circle and can, for example, be a square, an ellipse, a triangle, a rhombus, or the like; a shape resulting from deforming a section of a particular shape; or a shape resulting from combining a plurality of shapes. The same applies to each recess 63. Additionally, the partition plate 60 is not limited to the rear end of the inner heat cover 30 and can be provided on the rear end face X2.For example, a separating plate can be provided at a position that is separated from the rear end of the inner heat cover 30 on the front end X1 by 1 mm or greater and 10% or less than 10% of the length of the first outer heat cover 40 in the X direction.

[0075] In the seventh embodiment, the recesses and projections 46 formed on the non-perforated region of the first outer heat cover 40 are configured by sections whose cross-section has a protruding shape, and sections whose cross-section has a recessed shape, but are not limited to this. The recesses and projections 46 can be configured solely by sections whose cross-section has a protruding shape, or solely by sections whose cross-section has a recessed shape.Furthermore, the planar shape of sections with a protruding cross-section and sections with a recessed cross-section is not limited to a circle and can, for example, be a quadrilateral, an ellipse, a triangle, a rhombus, or the like; a shape resulting from deforming a section of a certain shape; or a shape resulting from combining multiple shapes. Additionally, sections with a protruding cross-section and sections with a recessed cross-section can be of the same size or different in size.

[0076] In the first to seventh embodiments, examples were described in which the rear end X2 of the first outer heat cover 40 is attached to the cooling unit 20, but this is not a limitation. The rear end X2 of the first outer heat cover 40 may be in contact with the cooling unit 20 without being attached to it, or need not be in contact with the cooling unit 20. Furthermore, a perforated region with the same configuration as that of the first outer heat cover 40 may be provided on the second outer heat cover 50 (underside Y2).

[0077] With regard to the embodiments and variants described above, the following additional remarks are also disclosed. (Additional Note 1)

[0078] A heat cover for an injection molding machine, mounted on a heating cylinder that injects a molding material from a tip towards a mold, the heat cover being provided with: an inner heat cover (30) located outside the heating cylinder; and an outer heat cover (40) located outside the inner heat cover, wherein a rear end of the inner heat cover, between the rear end of the inner heat cover and a cooling unit provided at a rear end of the heating cylinder, has an outlet area for directing a portion of a high-temperature gas generated around the heating cylinder to a rear end of the outer heat cover, and the outer heat cover has a perforated region (41) on a side closer to the mold and a non-perforated region (42) on a side closer to the cooling unit. (Additional Note 2)

[0079] The outlet area includes 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, or a recess (33) provided in the inner heat cover. (Additional Note 3)

[0080] At the rear end of the inner heat cover, a partition plate (60) is provided to limit a flow rate by which part of the high-temperature gas generated around the heating cylinder moves from the outlet area to the rear end of the outer heat cover, and at least one of a gap (61), hole (62) or recess (63) is provided between the heating cylinder and the inner heat cover, which includes the partition plate. (Additional note 4)

[0081] The rear end of the outer heat cover is attached to the cooling unit. (Additional note 5)

[0082] A cooling element is present in the non-perforated region of the outer heat cover. (Additional Note 6)

[0083] Injection molding machine (1) equipped with: a mold (2); a mold clamping device (3) configured to open, close and clamp the mold; an injection device (4) comprising a heating cylinder (10) which injects a molding material from a tip towards the mold; and the cover described above, which is for an injection molding machine and is mounted on the heating cylinder. Reference symbol list

[0084] 1: Injection molding machine, 2: Mold, 3: Mold clamping device, 4: Injection device, 10: Heating cylinder, 20: Cooling unit, 30: Inner heat cover, 31: Gap (exit area), 32: Hole (exit area), 33: Recess (exit area), 40: First outer heat cover, 41: Perforated region, 42: Non-perforated region, 46: Recesses and projections (cooling section), 47: Heat sink (cooling section), 48: Cooling device (cooling section), 50: Second outer heat cover, 60: Dividing plate, 61: Gap, 62: Hole, 63: Recess QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2018-1713

[0004] JP 2020-100071

[0004]

Claims

[1] Heat cover for an injection molding machine and mounted on a heating cylinder which injects a molding material from a tip towards a mold, the heat cover comprising: an inner heat cover located on the outside of the heating cylinder; and an outer heat cover that is located outside the inner heat cover, wherein a rear end of the inner heat cover, between the rear end of the inner heat cover and a cooling unit provided at a rear end of the heating cylinder, has an outlet area for directing a portion of a high-temperature gas generated around the heating cylinder to a rear end of the outer heat cover, and The outer heat cover has a perforated region on a side closer to the mold and a non-perforated region on a side closer to the cooling unit. [2] Heat cover according to claim 1, wherein the outlet area includes at least one of a gap formed between the inner heat cover and the cooling unit, a hole provided in the inner heat cover, or a recess provided in the inner heat cover. [3] Heat cover according to claim 1 or 2, further comprising: at the rear end of the inner heat cover a partition plate for limiting a flow rate at which part of the high-temperature gas generated around the heating cylinder moves from the outlet area to the rear end of the outer heat cover, and at least one of a gap, hole and recess provided between the heating cylinder and the inner heat cover which includes the partition plate to limit the flow rate. [4] Heat cover according to any one of claims 1 to 3, wherein the rear end of the outer heat cover is attached to the cooling unit. [5] Heat cover according to any one of claims 1 to 4, wherein the non-perforated region of the outer heat cover has a cooling element. [6] Injection molding machine, comprising: a form; a mold clamping device configured to open, close, and clamp the mold; an injection device comprising a heating cylinder that injects a molding material from a tip towards the mold; and the heat cover according to claim 1, which is mounted on the heating cylinder.

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