Nozzle heater device and injection molding machine

Abstract

The present invention relates to a nozzle heater device and an injection molding machine, which suppresses positional displacement of a heater of a nozzle of an injection molding machine in an axial direction. A nozzle heater device (1) has: a heater (10) configured to surround a nozzle (20) that injects molten resin; a heater fixing member (11) that fixes the heater (10); a first movement restricting member (12) that restricts movement of the heater fixing member (11) toward a root side in an axial direction of the nozzle (20); and a second movement restricting member (13) that restricts movement of the heater fixing member (11) toward a tip side in the axial direction of the nozzle (20).

Description

Technical Field

[0001] This application claims priority based on Japanese Patent Application No. 2024-212318, filed on December 5, 2024. The entire contents of that Japanese application are incorporated herein by reference.

[0002] This invention relates to a nozzle heater device and an injection molding machine. Background Technology

[0003] When the nozzle heater of an injection molding machine is subjected to external force, or during disassembly for cleaning, it may sometimes move from a pre-defined position (see reference). Figure 11 (A) is offset axially from the nozzle. For example, if the heater is positioned towards the front end of the nozzle axially (refer to...). Figure 11 If the heater is shifted towards the nozzle (B), the temperature detected by the thermocouple (temperature sensor) will be higher in the region at the nozzle tip and lower in the region at the nozzle root. This can easily lead to problems such as stringing, drooling, and cold slag. Furthermore, for example, if the heater is positioned towards the nozzle root (refer to...) Figure 11 If the nozzle (C) is offset, the temperature detected in the region at the root of the nozzle becomes higher, while the temperature detected in the region at the tip of the nozzle becomes lower. This can easily lead to nozzle clogging due to resin curing at the tip of the nozzle, and resin carbonization in the region at the root of the nozzle. Thus, even with the same set temperature, axial displacement of the heater can cause changes in the axial temperature distribution of the nozzle, sometimes resulting in poor molding. In contrast, Patent Document 1 discloses fixing the position of the temperature sensor by inserting a temperature sensor that penetrates the heater into the nozzle.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2015-189128

[0005] However, even with a fixed temperature sensor position, if the heater position is offset axially from the nozzle, the temperature distribution will change, sometimes causing poor molding. Furthermore, since thin thermocouples are sometimes used as temperature sensors, they are prone to breakage if shear force is applied to them due to external forces. Summary of the Invention

[0006] The purpose of this invention is to suppress the axial displacement of the heater of the nozzle in an injection molding machine, which can cause poor molding and temperature sensor breakage.

[0007] The nozzle heater device of the present invention, completed based on this purpose, is characterized by having: a heater configured to surround a nozzle for injecting molten resin; a heater fixing member for fixing the heater; a first movement limiting member for limiting the movement of the heater fixing member toward the root side of the nozzle in the axial direction; and a second movement limiting member for limiting the movement of the heater fixing member toward the front end side in the axial direction.

[0008] Here, it can also be characterized in that the first movement limiting member is configured as a wall or step sandwiched between the cylinder disposed on the root side and the heater fixing member.

[0009] Furthermore, it may also be characterized in that the second movement limiting member is a wall, step, or nut that is fixed in a state of contact with the front end side of the heater fixing member.

[0010] Furthermore, it can also be characterized in that the heater fixing component can be disassembled and assembled by removing the second movement limiting component, the second movement limiting component is installed after the heater fixing component is installed on the nozzle, and the heater fixing component is positioned in the axial direction by being clamped by the first movement limiting component and the second movement limiting component.

[0011] Furthermore, it may also be characterized in that the second movement limiting member is a cylindrical member having a portion that surrounds the heater from the outer side in the radial direction.

[0012] Furthermore, it may also be characterized by having a thermocouple for measuring the internal temperature of the nozzle, with a notch formed on the heater fixing member for the thermocouple to pass through.

[0013] Furthermore, it may also be characterized in that a plurality of heaters are fixed on the heater fixing component.

[0014] Furthermore, it can also be characterized in that the inner diameter of the heater fixing component is approximately the same as the outer diameter of the nozzle.

[0015] Furthermore, it can also be characterized in that the heater fixing component is a component formed by fixing multiple rod-shaped components to an annular component.

[0016] Furthermore, the injection molding machine of the present invention, completed based on this purpose, includes a nozzle heater device, characterized in that the nozzle heater device comprises: a heater configured to surround a nozzle for injecting molten resin; a heater fixing member for fixing the heater; a first movement limiting member for limiting the movement of the heater fixing member toward the root side of the nozzle in the axial direction; and a second movement limiting member for limiting the movement of the heater fixing member toward the front end side in the axial direction.

[0017] Invention Effects

[0018] According to the present invention, it is possible to suppress the axial positional displacement of the heater of the nozzle of the injection molding machine. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view showing an example of the overall structure of the nozzle heater device according to this embodiment.

[0020] Figure 2 It indicates composition Figure 1 A diagram showing a modified example of the second movement limiting component of the nozzle heater device.

[0021] Figure 3 It means Figure 2 A further variation of the nozzle heater device is shown in the figure.

[0022] Figure 4 This is a diagram illustrating an example of the prior art of arranging spacers between adjacent heaters.

[0023] Figure 5 In the middle (A) and (B), it is indicated that the components are... Figure 1 A diagram showing a modified example of the heater fixing component of the nozzle heater device.

[0024] Figure 6 In the middle (A) and (B), it is indicated that the components are... Figure 1 A diagram showing a variation of the heater and heater fixing component of the nozzle heater device.

[0025] Figure 7 It indicates composition Figure 1 A diagram showing a variation of the heater and heater fixing component of the nozzle heater device.

[0026] Figure 8 (A) represents the composition Figure 1 A diagram showing a modified example of the heater fixing component of the nozzle heater device. Figure 8 (B) indicates composition Figure 2 A diagram showing a modified example of the heater fixing component and the second movement limiting component of the nozzle heater device.

[0027] Figure 9 It means Figure 1 A diagram showing a specific example of a nozzle heater device.

[0028] Figure 10 It means Figure 1 A diagram showing a specific example of a nozzle heater device.

[0029] Figure 11Figures (A) to (C) are diagrams illustrating the heater of the nozzle in a conventional injection molding machine.

[0030] Explanation of symbols

[0031] 1- Nozzle heater assembly; 10, 10-1, 10-2, 40, 50- Heater; 11, 51, 61, 71- Heater fixing component; 12- First movement limiting component; 13, 33- Second movement limiting component; 14- Thermocouple; 15- Screw; 16- Threaded hole; 20- Nozzle; 21- Injection port; 22- Injection port; 23, 31- Threaded mechanism; 24- Nut; 25- Groove; 30- Cylinder; 111, 112, 513, 514, 611, 612, 711, 712- Surface; 113, 131- Notch; 511- Ring-shaped component; 512- Rod-shaped component. Detailed Implementation

[0032] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0033] <Structure of Nozzle Heater Device 1>

[0034] Figure 1 This is a cross-sectional view showing an example of the overall structure of the nozzle heater device 1 according to this embodiment.

[0035] Figure 1 The nozzle heater device 1 shown is a device for temperature control of the nozzle 20 mounted on an injection molding machine that performs injection molding with resin as the material. The nozzle 20 injects molten resin from an injection port 21 formed at its axially forward end toward a mold (not shown). The axial (hereinafter referred to as "axial") root side of the nozzle 20 is fixed to a cylindrical cylinder 30 that delivers molten resin toward the nozzle 20.

[0036] The nozzle heater assembly 1 includes a cylindrical heater 10 disposed radially outside the nozzle 20. Furthermore, the nozzle heater assembly 1 includes a cylindrical heater fixing member 11 disposed between the nozzle 20 and the heater 10 when the heater 10 is fixed. The nozzle heater assembly 1 also includes a first movement limiting member 12 that restricts axial movement of the heater fixing member 11 towards its root. Additionally, the nozzle heater assembly 1 includes a second movement limiting member 13 that restricts axial movement of the heater fixing member 11 towards its front end. Finally, the nozzle heater assembly 1 includes a thermocouple 14 for measuring the internal temperature of the nozzle 20.

[0037] [Heater mounting component 11]

[0038] The heater mounting member 11 is a cylindrical component extending axially. The heater mounting member 11 is positioned radially outward relative to the nozzle 20, with the heater 10 fixed to a circumferential surface. The method of fixing the heater 10 to the heater mounting member 11 is not particularly limited. For example, the heater 10 can be fixed to the heater mounting member 11 using methods such as bonding or welding.

[0039] The inner diameter of the heater mounting member 11 is approximately the same as the outer diameter of the nozzle 20. If a gap forms between the heater mounting member 11 and the nozzle 20, it may cause a delay in temperature control and a decrease in the reaction rate. Therefore, in order to suppress the formation of a gap between the heater mounting member 11 and the nozzle 20, the heater mounting member 11 and the nozzle 20 can be interference-fitted.

[0040] The axial root side end face 111 of the heater fixing member 11 contacts the first movement limiting member 12. The axial front side end face 112 of the heater fixing member 11 contacts the second movement limiting member 13. Thus, the heater fixing member 11 is axially positioned while being clamped by the first movement limiting member 12 and the second movement limiting member 13.

[0041] A notch 113 for the passage of a thermocouple 14 is formed on the heater mounting member 11. Specifically, the notch 113 is formed at the root end of the heater mounting member 11 in the axial direction. By forming the notch 113, even when the heater mounting member 11 slides in the axial direction, the heater mounting member 11 can be smoothly installed and removed without interfering with the wiring of the thermocouple 14 on the nozzle 20 or the wiring (not shown) of the heater 10. The specific location and shape of the notch 113 will be discussed later. Figure 9 To narrate.

[0042] The heater 10 is fixed to the heater fixing member 11. As described above, the heater fixing member 11 is axially positioned while being clamped by the first movement limiting member 12 and the second movement limiting member 13, so the heater 10 fixed to the heater fixing member 11 is also positioned at the same time.

[0043] The number of heaters 10 fixed to the heater mounting member 11 is not particularly limited. Multiple heaters 10 can be fixed to the heater mounting member 11. When the nozzle 20 is long in the axial direction, if one thermocouple 14 is used for one heater 10, it is difficult to control it to a constant temperature unless a heater 10 that is long enough in the axial direction is installed. Therefore, by controlling multiple heaters 10 and multiple thermocouples 14, it is possible to control the nozzle 20 to a constant temperature. In addition, a specific example of a heater mounting member 11 on which multiple heaters 10 are fixed will be referred to later. Figure 3 and Figure 9 To narrate.

[0044] The heater fixing member 11 can be installed and removed with the second movement limiting member 13 removed. Specifically, the heater fixing member 11 can be removed by removing the second movement limiting member 13 and sliding the heater fixing member 11 towards the front end side in the axial direction. Furthermore, the heater fixing member 11 can be installed by sliding it from the front end side to the root side in the axial direction.

[0045] [First movement restriction component 12]

[0046] The first movement limiting member 12 is a cylindrical member configured to be sandwiched between the cylinder body 30 and the heater fixing member 11. The first movement limiting member 12 is fixed to the cylinder body 30. The axial root-side end face 111 of the heater fixing member 11 contacts the first movement limiting member 12. Thus, the first movement limiting member 12 functions as a wall or step that restricts the axial movement of the heater fixing member 11 towards the root side. That is, the first movement limiting member 12 clamps the heater fixing member 11 with the second movement limiting member 13 to position the heater fixing member 11 axially.

[0047] [Second Movement Restriction Component 13]

[0048] The second movement limiting member 13 is fixed at a position contacting the end face 112 of the heater fixing member 11 on its axial front end side. The second movement limiting member 13 has a portion that, together with the first movement limiting member 12, clamps the heater fixing member 11 and a portion that covers the outer peripheral surface of the heater 10. The method of fixing the second movement limiting member 13 is not particularly limited, but... Figure 1In this example, the second movement limiting member 13 is fixed to the first movement limiting member 12 by inserting a screw 15 into a screw hole that connects the first movement limiting member 12 and the second movement limiting member 13. Thus, the second movement limiting member 13 functions as a wall that restricts the axial movement of the heater fixing member 11 towards its front end. That is, the second movement limiting member 13 clamps the heater fixing member 11 together with the first movement limiting member 12, thereby axially positioning the heater fixing member 11.

[0049] The second movement limiting member 13 has a portion covering the outer peripheral surface of the heater 10, and therefore can also function as a cover for the nozzle heater assembly 1. By functioning as a cover, the second movement limiting member 13 can suppress contamination caused by molten resin.

[0050] A notch 131 for the passage of the thermocouple 14 is formed on the second movement limiting member 13. Specifically, the notch 131 is formed at the root end of the second movement limiting member 13 in the axial direction. By forming the notch 131, the second movement limiting member 13 can slide in the axial direction, allowing the second movement limiting member 13 to be smoothly installed and removed without interfering with the wiring of the thermocouple 14 on the nozzle 20 or the wiring of the heater 10. The specific location and shape of the notch 131 will be discussed later. Figure 10 To narrate.

[0051] Alternatively, the heater fixing member 11, to which the heater 10 is fixed, and the second movement limiting member 13 can be joined (bonded, welded, etc.) to form an integral unit. In this case, the position of the heater 10 relative to the second movement limiting member 13 is fixed.

[0052] [Thermocouple 14]

[0053] Thermocouple 14 is a temperature sensor for measuring the internal temperature of nozzle 20. Here, in order to control the resin temperature as accurately as possible, thermocouple 14 is placed near the molten resin inside nozzle 20. That is, thermocouple 14 is preferably placed radially inwards from heater 10 and heater fixing member 11. In this case, thermocouple 14 is placed before heater 10 and heater fixing member 11 are installed.

[0054] <Variation Example 1>

[0055] Figure 2 It indicates composition Figure 1 A modified example of the second movement limiting member 13 of the nozzle heater device 1 is shown in the figure.

[0056] Figure 2 The structure of the nozzle heater device 1 shown is basically the same as Figure 1The structures shown are the same, but the structure of the second movement restriction component is different.

[0057] That is, as mentioned above, the above Figure 1 The second movement limiting member 13 is configured to surround the heater 10, thus functioning as a cover for the nozzle heater assembly 1. In contrast, Figure 2 The second movement limiting member 33 is not configured to surround the heater 10. Specifically, the second movement limiting member 33 functions solely as a wall or step that restricts the axial movement of the heater fixing member 11 towards its front end by being fixed at a position that contacts the end face 112 of the heater fixing member 11 at its axially forward front end. The shape of the second movement limiting member 33 is not particularly limited and can be composed of a ring-shaped or cylindrical component.

[0058] The method of fixing the second movement limiting member 33 is not particularly limited. For example, the second movement limiting member 33 can be constituted by a nut, and a threaded mechanism that engages with the nut can be formed on the front end side of the heater fixing member 11 in the axial direction. In this case, the second movement limiting member 33, which is the nut, is fixed to the nozzle 20 in a state of contact with the end face 112 of the front end side of the heater fixing member 11.

[0059] <Variation Example 2>

[0060] Figure 3 It means Figure 2 A further variation of the nozzle heater device 1 is shown in the figure.

[0061] Figure 4 This is a diagram illustrating an example of the prior art of arranging spacers between adjacent heaters.

[0062] Figure 3 The structure of the nozzle heater device 1 shown is basically the same as Figure 2 The structures shown are the same, but the number of heaters 10 is different. That is, in Figure 2 In the structure shown, heater 10 is a single unit, but... Figure 3 The structure shown has two heaters, 10-1 and 10-2.

[0063] like Figure 4 As shown, conventionally, when multiple heaters are arranged in a nozzle, the position of the heaters is restricted by placing spacers between adjacent heaters. In contrast, Figure 3 The heaters 10-1 and 10-2 of the nozzle heater device 1 shown are axially positioned with their parts fixed to the heater fixing member 11. As such, it is not necessary to place spacers between the heaters as in the past.

[0064] <Variation Example 3>

[0065] Figure 5 In the middle (A) and (B), it is indicated that the components are... Figure 1 A modified example of the heater fixing part 11 of the nozzle heater device 1 is shown in the figure.

[0066] Constituting the above Figure 1 The heater fixing member 11 of the nozzle heater device 1 shown is a cylindrical member extending axially, but it is not limited to this. The heater fixing member involved in this invention is along the shape of the nozzle 20 and only needs to be able to fix the heater 10; for example, it can be... Figure 5 The heater fixing component 51 shown in (A) and (B) has the same shape.

[0067] exist Figure 5 Image (A) shows the state of the heater mounting component 51 viewed axially. Figure 5 A perspective view of the heater fixing member 51 is shown in Figure (B). The heater fixing member 51 is a member in which a plurality of rod-shaped members 512 are fixed to the annular member 511 at intervals. The root-side surface 513 of the plurality of rod-shaped members 512 in the axial direction is connected to the first movement limiting member 12 (see reference). Figure 1 The annular member 511 contacts the front end face 514 on its axial direction. Furthermore, the second movement limiting member 13 (see reference 13) makes contact with the front end face 514 on its axial direction. Figure 1 The heater fixing member 51 is thus fixed in a state where it is clamped by the first movement limiting member 12 and the second movement limiting member 13.

[0068] One or more heaters 10 are fixed on the outer side of the heater fixing member 51 in the radial direction (reference). Figure 1 Thus, the heater 10 is positioned axially. The method of fixing the heater 10 to the heater fixing member 51 is not particularly limited. For example, the heater 10 can be fixed to the heater fixing member 51 using methods such as bonding or welding.

[0069] Since the multiple rod-shaped members 512 constituting the heater fixing member 51 are arranged at intervals, a space is formed between adjacent rod-shaped members 512. By forming such a space, even if the heater fixing member 51 slides in the axial direction, it is possible to avoid interfering with the thermocouple 14 (see reference) of the nozzle 20. Figure 1 The wiring of the heater 10 and the wiring of the heater can be smoothly installed and removed from the heater fixing part 51.

[0070] <Variation Example 4>

[0071] Figure 6 In the middle (A) and (B), it is indicated that the components are... Figure 1 A diagram showing a modified example of the heater 10 and heater fixing component 11 of the nozzle heater device 1.

[0072] The heater fixing component involved in this invention is along the shape of the nozzle 20 and only needs to be able to fix the heater; for example, it can be... Figure 6 The heater fixing component 61 shown in (A) and (B) has the same shape.

[0073] exist Figure 6 Image (A) shows a cross-sectional view obtained by cutting along the radial direction a cylindrical heater fixing member 61 on which the heater 40 is disposed. Figure 6 Figure (B) shows a cross-sectional view obtained by cutting along the axial direction of a heater fixing member 61 in which heaters 40 are arranged. Grooves or the like are formed on the inner wall surface of the heater fixing member 61 in the radial direction, and annular heaters 40 are arranged in these grooves or the like. Multiple heaters 40 are arranged at intervals along the axial direction of the heater fixing member 61.

[0074] The root side surface 611 of the heater fixing member 61 in the axial direction meets the first movement limiting member 12 (reference). Figure 1 Contact. Furthermore, the axially extending front end side 612 of the heater fixing member 61 contacts the second movement limiting member 13 (see reference). Figure 1 The heater fixing member 61 is thus fixed in a state where it is clamped by the first movement limiting member 12 and the second movement limiting member 13. Simultaneously, the axial positioning of the plurality of heaters 40 is performed.

[0075] <Variation Example 5>

[0076] Figure 7 It indicates composition Figure 1 A diagram showing a modified example of the heater 10 and heater fixing component 11 of the nozzle heater device 1.

[0077] The heater fixing component of the present invention is shaped along the nozzle 20 and can be used as long as it can fix the heater; for example, it can be as follows: Figure 7 The heater fixing component 71 shown is divided into a shape that allows it to be separated.

[0078] exist Figure 7 The figure shows a perspective view of a heater fixing member 71 on the outer surface of the heater 50 arranged in the radial direction. The heater fixing member 71 is cylindrical when mounted on the nozzle 20. Therefore, the root side surface 711 of the heater fixing member 71 in the axial direction intersects with the first movement limiting member 12 (see reference). Figure 1 The heater fixing member 71's front end face 712 in the axial direction contacts the second movement limiting member 13 (see reference). Figure 1The heater fixing member 71 is thus fixed in a state where it is clamped by the first movement limiting member 12 and the second movement limiting member 13. At the same time, the heater 50 is positioned axially.

[0079] like Figure 7 As shown, during maintenance, the heater mounting member 71 can be separated into two parts axially along with the heater 50. With this structure, it is not necessary to slide the heater mounting member 71 when assembling or disassembling it relative to the nozzle 20. However, since the wiring of the thermocouple 14 and the wiring of the heater 10 need to be connected to both sides of the heater mounting member 71 that is divided into two parts, a structure that is not divided in this respect is more preferable.

[0080] <Variation Example 6>

[0081] Figure 8 (A) represents the composition Figure 1 A modified example of the heater fixing part 11 of the nozzle heater device 1 is shown in the figure.

[0082] The heater fixing component of the present invention is shaped along the nozzle 20 and can be used as long as it can fix the heater; for example, it can be as follows: Figure 8 As shown in (A), the heater fixing member 11 has a rounded shape on its root side and front end side in the axial direction. Even though surfaces 111 and 112 are rounded, a portion of surface 111 will interact with the first movement limiting member 12 (see reference). Figure 1 Point contact, a portion of surface 112 will also contact the second movement limiting component 13 (see reference). Figure 1 Point contact. Thus, the heater fixing member 11 is fixed in a state where it is connected by the first movement limiting member 12 and the second movement limiting member 13.

[0083] <Variation Example 7>

[0084] Figure 8 (B) indicates composition Figure 2 A modified example of the heater fixing member 11 and the second movement limiting member 13 of the nozzle heater device 1 is shown in the figure.

[0085] The heater fixing member of the present invention only needs to be shaped along the nozzle 20 and capable of fixing the heater. Furthermore, the second movement limiting member of the present invention only needs to be fixed in a state of contact with the axially extending front end portion of the heater fixing member. Therefore, the heater fixing member and the second movement limiting member of the present invention can, for example, be... Figure 8 The heater fixing member 11 and the second movement limiting member 33 shown in (B) each have the same shape.

[0086] That is, in Figure 8 A protrusion 114 protruding outward in the radial direction is formed near the end of the heater fixing member 11 on the axial front end side shown in (B). The second movement limiting member 33 is shaped like a cap covering the end of the heater fixing member 11 on the axial front end side, and is fixed in contact with the protrusion 114 of the heater fixing member 11. At this time, the surface of the heater fixing member 11 on the axial front end side does not contact the second movement limiting member 33, but the protrusion 114 contacts the second movement limiting member 33. Therefore, the heater fixing member 11 is fixed in a state where it is sandwiched between the first movement limiting member 12 and the second movement limiting member 13. At the same time, the heater 10 is positioned in the axial direction. In addition, the method of forming the protrusion 114 on the heater fixing member 11 is not particularly limited. The annular member can be joined to the heater fixing member 11 by welding or other methods, or the protrusion 114 can be integrally formed as part of the heater fixing member 11.

[0087] <Specific examples>

[0088] Figure 9 and Figure 10 It means Figure 1 A specific example of the nozzle heater device 1 is shown in the figure. Additionally, in Figure 9 The image shows the state before the installation of the second movement restriction component 13.

[0089] like Figure 9 As shown, the nozzle heater assembly 1 includes a heater fixing member 11. Two heaters 10-1 and 10-2 are wound around the heater fixing member 11. Thus, heaters 10-1 and 10-2 are fixed to the heater fixing member 11. Furthermore, the nozzle heater assembly 1 includes a thermocouple 14 for measuring the internal temperature of the nozzle 20. The thermocouple 14 is disposed in a groove 25 formed on the surface of the nozzle 20 and extending axially. Therefore, the thermocouple 14 does not contact the inner surface of the heater fixing member 11 in the radial direction. A threaded mechanism 23 and a threaded mechanism 31 are respectively provided at the root side of the nozzle 20 in the axial direction and at the front end side of the cylinder 30 in the axial direction, respectively, and the nozzle 20 is fixed to the cylinder 30 by their screwing.

[0090] And, as Figure 10 As shown, the nozzle heater device 1 has a first movement limiting member 12 that restricts the movement of the heater fixing member 11 toward the root side in the axial direction. Figure 9The face 111 of the axial root side end of the heater fixing member 11 shown contacts the first movement limiting member 12. Thus, the first movement limiting member 12 functions as a wall or step that restricts the axial movement of the heater fixing member 11 towards the root side. A screw hole 16 is formed on the first movement limiting member 12 for fixing the second movement limiting member 13 with a screw 15.

[0091] Furthermore, the nozzle heater assembly 1 has a second movement limiting member 13 that restricts the movement of the heater fixing member 11 toward the front end side of the nozzle 20 in the axial direction. The second movement limiting member 13 is fixed to the surface 112 of the end of the heater fixing member 11 at the front end side in the axial direction (see reference). Figure 9 The second movement limiting member 13 thus functions as a wall or step that restricts the axial movement of the heater fixing member 11 towards its front end. The second movement limiting member 13 is fixed to the first movement limiting member 12 by screws 15.

[0092] The second movement limiting member 13 is disposed on the outer side in the radial direction, surrounding heaters 10-1 and 10-2. Therefore, the second movement limiting member 13 also functions as a cover for the nozzle heater assembly 1. Furthermore, in Figure 9 and Figure 10 In the example, a threaded mechanism 23 is provided at the axial front end of the nozzle 20. The second movement limiting member 13 is securely fixed by screwing the nut 24 into the threaded mechanism 23. However, since the second movement limiting member 13 is fixed to the first movement limiting member 12 by screws 15, the threaded mechanism 23 and the nut 24 are not necessary structures.

[0093] like Figure 9 As shown, a notch 113 is formed at the root side end of the heater fixing member 11 in the axial direction. Furthermore, as... Figure 10 As shown, a notch 131 is formed at the root side end of the second movement limiting member 13 in the axial direction. Heaters 10-1 and 10-2 and thermocouple 14 are disposed on the inner and outer sides of the second movement limiting member 13 in the radial direction via notch 113 and notch 131.

[0094] In summary, the nozzle heater device 1 involved in this embodiment can be implemented in a variety of ways as long as it adopts the following structure.

[0095] That is, the nozzle heater device 1 includes: a heater 10 configured to surround a nozzle 20 for injecting molten resin; a heater fixing member 11 for fixing the heater 10; a first movement limiting member 12 for limiting the movement of the heater fixing member 11 toward the root side in the axial direction; and a second movement limiting member 13 for limiting the movement of the heater fixing member 11 toward the front end side in the axial direction.

[0096] Therefore, the first movement limiting member 12 and the second movement limiting member 13 restrict the axial movement of the heater fixing member 11, thereby suppressing the axial displacement of the heater 10 of the nozzle 20 of the injection molding machine, which could lead to poor molding or thermocouple 14 breakage. Furthermore, since the position of the heater 10 does not change before and after disassembly, cleaning of the nozzle 20, heater 10, etc., becomes easier. Moreover, even if multiple injection molding machines exist, the heater 10 can be arranged in the same position, thus suppressing temperature differences between the nozzles 20 of different machines.

[0097] Here, it can also be characterized in that the first movement limiting member 12 is a wall or step sandwiched between the cylinder 30 disposed on the root side in the axial direction and the heater fixing member 11.

[0098] This restricts the heater fixing component 11 from moving axially toward the root side.

[0099] Furthermore, it may also be characterized in that the second movement limiting member 13 is a wall, step or nut that is fixed in a state of contact with the front end side surface 112 of the heater fixing member 11 in the axial direction.

[0100] This restricts the heater fixing component 11 from moving axially toward the front end.

[0101] Furthermore, it can also be characterized in that the heater fixing component 11 can be disassembled and assembled by removing the second movement limiting component 13. After the heater fixing component 11 is installed on the nozzle 20, the second movement limiting component 13 is installed. The heater fixing component 11 is positioned axially by being clamped by the first movement limiting component 12 and the second movement limiting component 13.

[0102] Therefore, the heater fixing component 11 can be disassembled and assembled by removing the second movement restriction component 13, thus improving maintainability.

[0103] Furthermore, it may also be characterized in that the second movement limiting member 13 is a cylindrical member having a portion that surrounds the heater 10 from the outer side in the radial direction.

[0104] Thus, the second movement limiting member 13 functions as a cover, thereby suppressing contamination caused by molten resin.

[0105] Furthermore, it may also be characterized by having a thermocouple 14 for measuring the internal temperature of the nozzle 20, with a notch 113 formed on the heater fixing member 11 for the thermocouple 14 to pass through.

[0106] Therefore, by sliding the heater fixing member 11 towards the front end in the axial direction, the second movement limiting member 13 and the heater fixing member 11 can be smoothly disassembled and assembled without interfering with the wiring of the thermocouple 14 and the heater 10.

[0107] Furthermore, it may also be characterized in that a plurality of heaters 10 are fixed on the heater fixing member 11 (e.g., Figure 3 Heaters 10-1 and 10-2).

[0108] Therefore, even if the nozzle 20 is long in the axial direction, by configuring multiple heaters 10, the nozzle 20 can be controlled at a constant temperature, and there is no need to set spacers between the heaters 10.

[0109] Furthermore, it can also be characterized in that the inner diameter of the heater fixing part 11 is approximately the same as the outer diameter of the nozzle 20.

[0110] Therefore, it is possible to suppress the formation of a gap between the heater fixing part 11 and the nozzle 20, thereby suppressing the delay in temperature control and the reduction in reaction rate.

[0111] Furthermore, it may also be characterized in that the heater fixing member 51 is a member formed by fixing multiple rod-shaped members 512 to the annular member 511.

[0112] Thus, a space is formed between adjacent rod-shaped components 512, so by sliding the heater fixing component 51 towards the front end side in the axial direction, the heater fixing component 51 can be smoothly installed and removed without interfering with the wiring of the thermocouple 14 and the heater 10.

[0113] Furthermore, the injection molding machine involved in the first embodiment can be implemented in a variety of ways as long as it adopts the following structure.

[0114] That is, the injection molding machine according to the first embodiment includes a nozzle heater device 1, which has: a heater 10 configured to surround a nozzle 20 for injecting molten resin; a heater fixing member 11 for fixing the heater 10; a first movement limiting member 12 for limiting the movement of the heater fixing member 11 toward the root side in the axial direction; and a second movement limiting member 13 for limiting the movement of the heater fixing member 11 toward the front end side in the axial direction.

[0115] <Other>

[0116] The present invention has been described above, but it is not limited to the embodiments described above. Furthermore, the effects of the present invention are not limited to those described in the present invention.

[0117] For example, notches 113 and 131 respectively form spaces for the passage of wiring for the thermocouple 14 and heater 10, but any space that allows wiring to pass through can be formed, so holes instead of notches are acceptable. Furthermore, one or more phases of the cross-section in the radial direction of each of the heater fixing member 11 and the second movement limiting member 13 can be completely cut off (i.e., a slit extending axially is formed). Additionally, the above-described variation 3 ( Figure 5 The heater fixing component 51 in (B) is an example of a method in which multiple phases of the cross section in the radial direction are completely cut off.

Claims

1. A nozzle heater device, characterized in that, have: A heater configured to surround a nozzle into which molten resin is injected; A heater fixing component, used to fix the heater; The first movement limiting member restricts the heater fixing member from moving axially toward the root side of the nozzle; and The second movement limiting component restricts the movement of the heater fixing component toward the front end side of the axial direction.

2. The nozzle heater device according to claim 1, characterized in that, The first movement restriction component is a wall or step configured to be sandwiched between the cylinder disposed on the root side and the heater fixing component.

3. The nozzle heater device according to claim 1, characterized in that, The second movement restriction component is a wall, step, or nut that is fixed in contact with the front end portion of the heater fixing component in the axial direction.

4. The nozzle heater device according to claim 1, characterized in that, The heater fixing component can be disassembled and assembled by removing the second movement limiting component. After the heater fixing component is installed on the nozzle, the second movement limiting component is installed, and the heater fixing component is positioned axially by being clamped by the first movement limiting component and the second movement limiting component.

5. The nozzle heater device according to claim 1, characterized in that, The second movement limiting component is a cylindrical component having a portion that surrounds the heater from the outside in the radial direction.

6. The nozzle heater device according to claim 5, characterized in that, It also includes a thermocouple for measuring the internal temperature of the nozzle. A notch is formed on the heater fixing component for the thermocouple to pass through.

7. The nozzle heater device according to claim 1, characterized in that, Multiple heaters are fixed on the heater fixing component.

8. The nozzle heater device according to claim 1, characterized in that, The inner diameter of the heater fixing component is approximately the same as the outer diameter of the nozzle.

9. The nozzle heater device according to claim 1, characterized in that, The heater fixing component is a component formed by fixing multiple rod-shaped components to a ring-shaped component.

10. An injection molding machine comprising a nozzle heater device, characterized in that, The nozzle heater device has: A heater configured to surround a nozzle into which molten resin is injected; A heater fixing component, used to fix the heater; The first movement limiting member restricts the heater fixing member from moving axially toward the root side of the nozzle; and The second movement limiting component restricts the movement of the heater fixing component toward the front end side of the axial direction.

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