Injection nozzle mounting member, injection device, and injection molding machine

Abstract

To provide an injection nozzle mounting member capable of mounting an injection nozzle without drilling a tapped hole in the end face of the tip of a heating cylinder.SOLUTION: In an injection nozzle mounting member (30), a through hole (40) is made in the center of the shaft, a male thread (41) is formed on the outer circumference of the rear end, and a flange holder (46) is provided at a predetermined portion. The injection nozzle (5) is attached to the injection nozzle mounting member (30) by inserting a body (27) into the through hole (40). Next, the male thread (41) of the injection nozzle mounting member (30) is screwed onto the female thread (45) formed at the end of the heating cylinder (19) and tightened. The flange holder (46) then holds a flange (28) and the injection nozzle (5) is attached to the heating cylinder (19).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an injection nozzle mounting member for mounting an injection nozzle to a heating cylinder, an injection device to which an injection nozzle is mounted by the injection nozzle mounting member, and an injection molding machine. [Background technology]

[0002] The injection device of the injection molding machine includes a heating cylinder and a screw inserted in the heating cylinder, and an injection nozzle is provided at the tip of the heating cylinder. The injection nozzle is attached to the heating cylinder by a predetermined injection nozzle attachment member. An example of the injection nozzle attachment member is a presser foot, i.e., a cylinder head, as described in Patent Document 1. The cylinder head has a through hole in the center, into which the body of the injection nozzle is inserted. The rear end of the injection nozzle is formed with a flange portion with an enlarged diameter, and the flange portion is held down by the cylinder head. A plurality of tapped holes are formed in the end face of the tip of the heating cylinder, and the cylinder head is fastened to the heating cylinder by a plurality of bolts that screw into these tapped holes, and the injection nozzle is attached to the heating cylinder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-151745 A Summary of the Invention [Problem to be solved by the invention]

[0004] When the injection nozzle mounting member is a cylinder head, it is necessary to drill multiple tap holes in the end face of the tip of the heating cylinder. In order to drill the tap holes, the heating cylinder needs to have a certain thickness, and drilling the holes can be difficult. In particular, in the case of models where the heating cylinder is relatively thin, such as small machines, it is difficult to drill the tap holes.

[0005] The present disclosure provides an injection nozzle mounting member that allows an injection nozzle to be mounted without drilling a tap hole in the end face of the tip of a heating cylinder.

[0006] Other objects and novel features will become apparent from the description of this specification and the accompanying drawings. [Means for solving the problem]

[0007] The injection nozzle has a cylindrical body and a flange portion with an expanded diameter at the rear end. In the present disclosure, the injection nozzle mounting member for mounting the injection nozzle to the heating cylinder is configured as follows. That is, the injection nozzle mounting member has a through hole for inserting the body portion of the injection nozzle at the axial center, a male thread is formed on the outer circumferential surface of the rear end, and a flange pressing portion for pressing the flange portion of the injection nozzle against the heating cylinder is provided at a predetermined portion. The injection nozzle is mounted to the injection nozzle mounting member by inserting the body portion into the through hole. Then, the male thread is screwed into the female thread formed at the tip of the heating cylinder to mount the injection nozzle to the heating cylinder. Then, the flange portion is pressed down by the flange pressing portion, and the injection nozzle is mounted to the heating cylinder. Effect of the Invention

[0008] The injection nozzle attachment member of the present disclosure makes it possible to attach the injection nozzle to the heating cylinder without drilling a tap hole in the end face of the tip of the heating cylinder. [Brief description of the drawings]

[0009] [Figure 1] 1 is a front view showing an injection molding machine according to an embodiment of the present invention; [Diagram 2] 1 is a front cross-sectional view showing a part of an injection device, an injection nozzle attachment member, and an injection nozzle according to the present embodiment. [Diagram 3] FIG. 2 is a perspective view of an injection nozzle attachment member according to the present embodiment. [Figure 4A]2 is a front cross-sectional view showing an injection nozzle attachment member and an injection nozzle according to the present embodiment. FIG. [Figure 4B] 2 is a front cross-sectional view showing an injection nozzle attachment member and an injection nozzle according to the present embodiment. FIG. [Figure 4C] 2 is a front cross-sectional view showing a part of a heating cylinder, an injection nozzle attachment member, and an injection nozzle according to the embodiment of the present invention. FIG. [Figure 4D] 2 is a front cross-sectional view showing a part of a heating cylinder, an injection nozzle attachment member, and an injection nozzle according to the embodiment of the present invention. FIG. [Diagram 5] FIG. 4 is a front cross-sectional view showing a part of an injection device according to a comparative example. [Figure 6] FIG. 11 is a front cross-sectional view showing a part of an injection device according to a modification of the present embodiment, and an injection nozzle attachment member and an injection nozzle according to the modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Specific embodiments will be described in detail below with reference to the drawings. However, the present invention is not limited to the following embodiments. In order to clarify the description, the following description and drawings are appropriately simplified. In each drawing, the same elements are given the same reference numerals, and duplicated descriptions are omitted as necessary. In addition, hatching is omitted in some parts to avoid cluttering the drawings.

[0011] <Injection molding machine> As shown in Fig. 1, the injection molding machine 1 according to this embodiment is a so-called vertical injection molding machine. The injection nozzle mounting member 30 according to this embodiment, which will be described in detail later with reference to Figs. 2 and 3, is adapted to mount the injection nozzle 5 in this vertical injection molding machine, but can also be mounted in a horizontal injection molding machine. In other words, the type of injection molding machine is not important. The injection molding machine 1 according to this embodiment includes a toggle-type mold clamping device 2, an injection device 3, and a control device 4. The control device 4 is adapted to control the mold clamping device 2, the injection device 3, etc.

[0012] <Mold clamping device> The mold clamping device 2 is a so-called vertical mold clamping device, and includes a fixed platen 9 fixed to a bed 7, an upper movable platen 10 provided above the fixed platen 9, and a lower movable platen 11 provided within the bed 7. The upper movable platen 10 and the lower movable platen 11 are connected by three tie bars 12, 12, .... A toggle mechanism 14 is provided between the lower movable platen 11 and the fixed platen 9, and a turntable 15 is provided above the fixed platen 9. An upper mold 17 is provided on the upper movable platen 10, and a lower mold 18 is provided on the turntable 15. When the toggle mechanism 14 is driven, the upper mold 17 and the lower mold 18 are opened and closed.

[0013] <Injection device> The injection unit 3 is provided on the upper movable platen 10 of the mold clamping unit 2. The injection unit 3 includes a heating cylinder 19, a screw 20 provided in the heating cylinder 19, a screw driving unit 22, and a lifting unit 23 that lifts and lowers the entire injection unit 3. The heating cylinder 19 is provided with an injection nozzle 5 according to this embodiment as shown in Fig. 2, which will be described in detail next. The heating cylinder 19 is provided with heaters 25, 25, ..., and the injection nozzle 5 is provided with nozzle heaters 26, 26, ....

[0014] <Injection nozzle> As shown in Fig. 2, the injection nozzle 5 is composed of a relatively long cylindrical body 27 and an expanded flange 28, and a resin flow path 29 is formed at the center of the axis. The flange 28 is formed on the rear end side of the injection nozzle 5, that is, on the side attached to the heating cylinder 19. As shown in Fig. 2, the injection nozzle 5 is attached to the heating cylinder 19 by an injection nozzle attachment member 30 according to the present embodiment, which will be described in detail next. The injection nozzle 5 is provided with temperature sensors 33, 33 and nozzle heaters 26, 26. In order to provide the temperature sensors 33, 33, grooves 34, 34 are formed on the outer circumferential surface of the body 27 of the injection nozzle 5, and sensor holes 35, 35 are formed continuous with the grooves 34, 34.

[0015] <Injection nozzle mounting parts> As shown in FIG. 3, the injection nozzle mounting member 30 according to this embodiment includes a cylindrical portion 37 and a hexagonal nut-shaped fastening portion 38, and has an axial through hole 40. A male thread 41 is formed on the outer circumferential surface of the cylindrical portion 37. As shown in FIG. 2, the heating cylinder 19 has an axial hole 44 at its tip, and this hole 44 has a female thread 45. The male thread 41 of the cylindrical portion 37 of the injection nozzle mounting member 30 is adapted to be screwed into this female thread 45. The fastening portion 38 is provided for rotating the injection nozzle mounting member 30 with a tool such as a wrench. In the injection nozzle mounting member 30 according to this embodiment, the end face of the rear end of the cylindrical portion 37 is a flange pressing portion 46 that presses the flange portion 28 of the injection nozzle 5 (see FIG. 2).

[0016] In this embodiment, a method for attaching the injection nozzle 5 to the heating cylinder 19 will be described. First, as shown in Figures 4A and 4B, the injection nozzle attachment member 30 is attached to the injection nozzle 5. That is, the body 27 of the injection nozzle 5 is inserted into the through hole 40 of the injection nozzle attachment member 30. When inserted all the way, the end face of the rear end of the injection nozzle attachment member 30, i.e., the flange pressing portion 46, comes into contact with the flange portion 28 of the injection nozzle 5.

[0017] Next, the injection nozzle mounting member 30 according to this embodiment, which is provided with the injection nozzle 5, is attached to the heating cylinder 19 as shown in FIG. 4C. Specifically, the male thread 41 of the injection nozzle mounting member 30 is screwed into the female thread 45 of the axial hole 44 of the heating cylinder 19. Then, a tool such as a spanner is engaged with the fastening portion 38, and the injection nozzle mounting member 30 is rotated and fastened. Then, the flange portion 28 is pressed by the flange pressing portion 46, and the injection nozzle 5 is attached to the heating cylinder 19. As shown in FIG. 4D, temperature sensors 33, 33 and nozzle heaters 26, 26, ... are attached to the injection nozzle 5 as necessary. The attachment of the injection nozzle 5 to the heating cylinder 19 is completed.

[0018] [Comparative Example] The injection nozzle mounting member 30 according to this embodiment can be mounted even on a heating cylinder 19 having a relatively thin wall, and in order to understand this point, an injection device 3X according to a comparative example will be described with reference to Figure 5. The injection device 3X according to the comparative example is also provided with an injection nozzle 5 having the same configuration as the injection nozzle 5 according to this embodiment (see Figure 2). However, the injection nozzle mounting member to which this injection nozzle 5 is mounted differs from that of this embodiment.

[0019] Specifically, in the injection device 3X according to the comparative example, the injection nozzle mounting member is made of a cylinder head 50. The cylinder head 50 is fixed to the heating cylinder 19X by bolts 51, 51. In this case, it is necessary to form tapped holes 53, 53 in the end face of the tip of the heating cylinder 19X for screwing the bolts 51, 51. It is difficult to drill the tapped holes 53, 53 unless there is a margin in the thickness of the heating cylinder 19X. In contrast to such a comparative example, the injection nozzle mounting member 30 according to this embodiment (see FIG. 2) can mount the injection nozzle 5 without drilling tapped holes in the heating cylinder 19, so there is no need to consider the thickness of the heating cylinder 19.

[0020] <Modification> Various modifications are possible to the injection nozzle mounting member 30 according to this embodiment. Fig. 6 shows a state in which the injection nozzle 5 is mounted to the heating cylinder 19 by an injection nozzle mounting member 30A according to a modification. The injection nozzle mounting member 30A according to this modification of this embodiment also has a male thread 41 formed on the cylindrical portion 37, which is screwed into a female thread 45 of an axial hole 44 in the heating cylinder 19.

[0021] However, the injection nozzle mounting member 30A of the modified example differs from the present embodiment (see Figs. 2 and 3) in the flange pressing portion 46A that presses the flange portion 28 of the injection nozzle 5. That is, in the injection nozzle mounting member 30A of the modified example, the through hole 40 is expanded in a stepped shape near the rear end portion to form a step portion. This step portion serves as the flange pressing portion 46A that presses the flange portion 28. With the injection nozzle mounting member 30A of this modified example, it is possible to reliably mount the injection nozzle 5 even if the hole 44 formed in the heating cylinder 19 is relatively shallow and the length of the female thread 45 is relatively short.

[0022] Although the invention made by the present inventor has been specifically described above based on the embodiment, it goes without saying that the present invention is not limited to the embodiment already described, and various modifications are possible without departing from the gist of the invention. The above-described examples may be implemented in appropriate combination. [Explanation of symbols]

[0023] 1 Injection molding machine 2 Mold clamping device 3 Injection unit 4 Control unit 5 Injection nozzle 7 Bed 9 Fixed plate 10 Upper movable plate 11 Lower movable plate 12 Tie bar 14 toggle mechanism 15 turntable 17 Upper mold 18 Lower mold 19 Heating cylinder 20 Screw 22 Screw drive device 23 Lifting device 25 Heater 26 Nozzle heater 27 Body 28 Flange 29 Resin flow path 30 Injection nozzle mounting member 33 Temperature sensor 34 Groove 35 Sensor hole 37 Cylindrical portion 38 Fastening portion 40 Through hole 41 Male thread 44 hole 45 female thread 46 Flange holder

Claims

1. An injection nozzle mounting member for mounting an injection nozzle having a cylindrical body portion and a flange portion having an enlarged diameter at a rear end to a front end of a heating cylinder, the injection nozzle attachment member has a through hole at its axial center for inserting the body portion, a male screw formed on the outer peripheral surface of the rear end portion, and a flange pressing portion provided at a predetermined portion for pressing the flange portion against the heating cylinder, the injection nozzle is attached to the injection nozzle mounting member by inserting the body portion into the through hole, and the injection nozzle mounting member is attached to the heating cylinder by screwing the male thread into the female thread formed at the tip of the heating cylinder, and the flange portion is pressed down by the flange pressing portion to attach the injection nozzle.

2. 2. The injection nozzle attachment member of claim 1, wherein said injection nozzle attachment member includes a clamping portion for receiving and rotating a clamping tool.

3. 3. The injection nozzle attachment member according to claim 1, wherein said flange pressing portion is an end face of said rear end portion.

4. 3. The injection nozzle attachment member according to claim 1, wherein the through hole is expanded in a stepped manner in the vicinity of the outlet, the expanded stepped portion serving as the flange pressing portion.

5. A heating cylinder; A screw contained in the heating cylinder; An injection nozzle attached to the tip of the heating cylinder; an injection nozzle attachment member that attaches the injection nozzle to the heating cylinder; The heating cylinder has an axial hole at its tip, and a female screw is formed in the hole. The injection nozzle includes a cylindrical body portion and a flange portion having an expanded diameter at a rear end thereof, the injection nozzle attachment member has a through hole at its axial center for inserting the body portion, a male screw formed on the outer peripheral surface of the rear end portion, and a flange pressing portion provided at a predetermined portion for pressing the flange portion against the heating cylinder, the injection nozzle is attached to the heating cylinder by the injection nozzle mounting member such that the body portion is inserted into the through hole, the flange portion is held down by the flange holding portion, and the male thread is tightened into the female thread.

6. 6. The injection apparatus of claim 5, wherein the injection nozzle attachment member is provided with a fastening portion for receiving and rotating a fastening tool.

7. 7. The injection apparatus according to claim 5, wherein the flange pressing portion is an end face of the rear end portion of the injection nozzle mounting member.

8. 7. The injection device according to claim 5, wherein the through hole of the injection nozzle attachment member is expanded in a stepped manner in the vicinity of the outlet, the expanded stepped portion serving as the flange pressing portion.

9. a mold clamping device that clamps the mold; an injection device for injecting the injection material; The injection device includes a heating cylinder and A screw contained in the heating cylinder; An injection nozzle attached to the tip of the heating cylinder; an injection nozzle attachment member that attaches the injection nozzle to the heating cylinder; The heating cylinder has an axial hole at its tip, and a female screw is formed in the hole. The injection nozzle includes a cylindrical body portion and a flange portion having an expanded diameter at a rear end thereof, the injection nozzle attachment member has a through hole at its axial center for inserting the body portion, a male screw formed on the outer peripheral surface of the rear end portion, and a flange pressing portion provided at a predetermined portion for pressing the flange portion against the heating cylinder, the injection nozzle is attached to the heating cylinder by the injection nozzle mounting member such that the body portion is inserted into the through hole, the flange portion is held down by the flange holding portion, and the male thread is tightened into the female thread,

10. 10. The injection molding machine according to claim 9, wherein the injection nozzle attachment member is provided with a clamping portion for receiving and rotating a clamping tool.

11. 11. The injection molding machine according to claim 9, wherein the flange pressing portion is an end face of the rear end portion of the injection nozzle mounting member.

12. 11. The injection molding machine according to claim 9, wherein the through hole of the injection nozzle attachment member is expanded in a stepped manner in the vicinity of the outlet, the expanded stepped portion serving as the flange pressing portion.

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