Injection nozzle, injection device, and injection molding machine

Abstract

The present invention provides an injection nozzle capable of measuring the temperature of the rear end portion of the injection nozzle without opening a hole in an attachment fixing member for attaching the injection nozzle to a heating cylinder. The injection nozzle (5) is attached to the heating cylinder (19) by a predetermined attachment fixing member (30). A groove (38) having a predetermined length is formed on the outer peripheral surface of the injection nozzle (5) from the vicinity of the rear end portion thereof toward the front end thereof in the longitudinal direction thereof. Further, a sensor hole (39) having a predetermined depth is formed in the vicinity of the rear end portion continuously with the groove (38). A sensor part (41) at the front end of the rear end part temperature sensor (32) is arranged in the sensor hole (39), and a lead part (42) is accommodated along the groove (38) and is pulled out to the outside near the central part of the injection nozzle (5).

Description

Technical Field

[0001] The present invention relates to an injection nozzle provided in an injection molding machine, an injection device including the injection nozzle, and an injection molding machine. Background Art

[0002] The injection device of the injection molding machine includes a heating cylinder and a screw placed in the heating cylinder, and an injection nozzle is provided at the front end of the heating cylinder. The heating cylinder and the injection nozzle are provided with a heater in which a temperature sensor composed of a thermocouple is embedded. The heater is configured to be controlled according to the temperature measured by the temperature sensor.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2023-30519 Summary of the invention

[0006] Problems to be Solved by the Invention

[0007] The temperature sensor can be embedded in a desired position. For example, in the case of measuring the temperature of the rear end portion of the injection nozzle, that is, the portion close to the heating cylinder, it is necessary to proceed as described in Patent Document 1. The injection nozzle is mounted on the heating cylinder through a mounting and fixing component such as a cylinder head. In the case of mounting through the cylinder head, the rear end portion of the injection nozzle is accommodated in the cylinder head. Therefore, in the case of setting the temperature sensor near the rear end portion of the injection nozzle, a hole is made from the outer peripheral surface of the cylinder head so that it reaches the rear end portion of the injection nozzle, and a hole is also made in the rear end portion of the injection nozzle. These holes are aligned with each other and the temperature sensor is inserted. In this way, the temperature near the rear end portion of the injection nozzle can be measured. However, there is a problem that the temperature sensor cannot be installed in the case where a hole is not made on a mounting and fixing component such as a cylinder head.

[0008] The present disclosure provides an injection nozzle capable of measuring the temperature of a rear end portion of an injection nozzle without drilling a hole in a mounting and fixing member for mounting the injection nozzle to a heating cylinder.

[0009] Other objects and novel features will become apparent from the description of this specification and the accompanying drawings.

[0010] Means for solving problems

[0011] The injection nozzle is mounted on the front end of the heating cylinder of the injection device by a predetermined mounting and fixing component. In the present disclosure, a groove of a predetermined length is formed on the outer peripheral surface from the vicinity of the rear end portion of the injection nozzle toward the front end in the longitudinal direction of the injection nozzle. And, continuous with the groove, a sensor hole of a predetermined depth is opened near the rear end portion. The injection nozzle is provided with a rear end temperature sensor for measuring the temperature at its rear end portion. The sensor portion at the front end of the rear end temperature sensor is inserted into the sensor hole, the wire portion is accommodated along the groove, and is pulled out to the outside near the central portion of the injection nozzle.

[0012] Effects of the Invention

[0013] The present disclosure can measure the temperature of the rear end portion of the injection nozzle without opening a hole in the mounting and fixing member on which the injection nozzle is mounted. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 1 is a front view showing the injection molding machine according to the first embodiment.

[0015] Figure 2 This is a front cross-sectional view showing a part of the injection device and the injection nozzle according to the first embodiment.

[0016] Figure 3 is a perspective view of the injection nozzle according to the first embodiment.

[0017] Figure 4 It is a front cross-sectional view showing a part of an injection device and an injection nozzle according to a comparative example.

[0018] Figure 5 1 is a front cross-sectional view showing a part of the injection device and the injection nozzle according to the second embodiment.

[0019] Figure 6 is a perspective view showing a mounting and fixing member for mounting an injection nozzle to a heating cylinder according to a second embodiment.

[0020] Fig. 7A : is a front cross-sectional view showing an injection nozzle according to a second embodiment.

[0021] Figure 7B : is a front cross-sectional view showing an injection nozzle and a mounting fixing member according to a second embodiment.

[0022] Figure 7C : is a front cross-sectional view showing an injection nozzle and a mounting and fixing member according to a second embodiment.

[0023] Fig.7D 1 is a front cross-sectional view showing a part of the injection device, the injection nozzle, and the mounting and fixing member according to the second embodiment.

[0024] Fig. 7E 1 is a front cross-sectional view showing a part of the injection device, the injection nozzle, and the mounting and fixing member according to the second embodiment.

[0025] Figure 8 It is a front cross-sectional view of a part of the injection device and the shutoff nozzle according to the third embodiment.

[0026] Description of Reference Numerals

[0027] 1 Injection molding machine 2 Mold clamping device

[0028] 3 Injection device 4 Control device

[0029] 5 Injection nozzle 7 Base

[0030] 9 Fixed plate 10 Upper movable plate

[0031] 11 Lower movable plate 12 Tie rod

[0032] 14 Toggle mechanism 15 Turntable

[0033] 17 Upper mold 18 Lower mold

[0034] 19 Heating cylinder 20 Screw

[0035] 22 Screw drive device 23 Lifting device

[0036] 25 Heater 26 Nozzle heater

[0037] 27 Main body 28 Flange

[0038] 29 Resin flow path 30 Cylinder head

[0039] 32 Rear end temperature sensor 33 Center temperature sensor

[0040] 34 Front end temperature sensor 36 Groove

[0041] 37 Sensor hole 38 Groove

[0042] 39 sensor hole 41 sensor part

[0043] 42 Lead wire portion 45 Sensor insertion hole

[0044] 46 Sensor hole 50 Injection nozzle mounting adapter

[0045] 51 cylindrical portion 52 fastening portion

[0046] 54 through hole 55 external thread

[0047] 57 Internal thread 59 Adapter heater

[0048] 65 Shut-off nozzle 66 Needle valve

[0049] 67 Cylinder unit 69 Support component

[0050] 71 Needle hole 73 Injection nozzle mounting block DETAILED DESCRIPTION

[0051] The specific implementation is described in detail below with reference to the accompanying drawings. However, it is not limited to the following implementation. For the purpose of clear description, the following description and the accompanying drawings are appropriately simplified. In each figure, the same elements are marked with the same reference numerals, and repeated descriptions are omitted as needed. In addition, in order to avoid confusion in the drawings, hatching is omitted in some parts.

[0052] [First Embodiment] <Injection Molding Machine>

[0053] like Figure 1 As shown, the injection molding machine 1 according to the first embodiment is composed of a so-called vertical injection molding machine. Figure 2 and Figure 3 The injection nozzle 5 according to the first embodiment described in detail is installed in the vertical injection molding machine, but it can also be installed in a horizontal injection molding machine, and the type of injection molding machine is not limited. The injection molding machine 1 according to the first embodiment includes a toggle-type mold clamping device 2, an injection device 3, and a control device 4. The control device 4 is configured to control the mold clamping device 2, the injection device 3, etc.

[0054] <Mold Clamping Device>

[0055] The mold clamping device 2 is composed of a so-called vertical mold clamping device, including a fixed plate 9 fixed to a base 7, an upper movable plate 10 arranged above the fixed plate 9, and a lower movable plate 11 arranged in the base 7. The upper movable plate 10 and the lower movable plate 11 are connected by three tie rods 12, 12, ... A toggle mechanism 14 is provided between the lower movable plate 11 and the fixed plate 9, and a turntable 15 is provided on the fixed plate 9. The upper movable plate 10 is provided with an upper mold 17, and the turntable 15 is provided with a lower mold 18. When the toggle mechanism 14 is driven, the upper mold 17 and the lower mold 18 are opened and closed.

[0056] <Injection device>

[0057] The injection device 3 is disposed above the upper movable plate 10 of the mold clamping device 2. The injection device 3 includes a heating cylinder 19, a screw 20 disposed in the heating cylinder 19, a screw driving device 22, and a lifting device 23 for lifting the injection device 3 as a whole. Figure 2As shown, the heating cylinder 19 is provided with the injection nozzle 5 according to the first embodiment, which will be described in detail below. The heating cylinder 19 is provided with heaters 25, 25, ..., and the injection nozzle 5 is provided with nozzle heaters 26, 26, ...

[0058] <Injection Nozzle>

[0059] like Figure 2 , Figure 3 As shown in FIG. 1 , the injection nozzle 5 according to the first embodiment is composed of a long cylindrical main body 27 and a flange 28 with an enlarged diameter, and a resin flow path 29 is opened at the center of the axis. The flange 28 is formed on the rear end side of the injection nozzle 5, that is, the side mounted to the heating cylinder 19. Figure 2 As shown, the injection nozzle 5 is mounted on the heating cylinder 19 in such a manner that the flange portion 28 is pressed by the cylinder head portion 30. The cylinder head portion 30 is a mounting and fixing member for mounting the injection nozzle 5 on the heating cylinder 19.

[0060] like Figure 2 As shown, the injection nozzle 5 is provided with a rear end temperature sensor 32 for measuring the temperature near the flange portion 28, that is, near the rear end, a central temperature sensor 33 for measuring the temperature near the central portion, and a front end temperature sensor 34 for measuring the temperature near the front end. Among these temperature sensors 32, 33, and 34, the central temperature sensor 33 and the front end temperature sensor 34 are provided in the injection nozzle 5 at an exposed portion, that is, a portion not covered by the cylinder head 30. Therefore, the installation is performed by the same method as the conventional nozzle.

[0061] That is, grooves 36, 36 are formed with a predetermined length on the outer peripheral surface of the main body 27 of the injection nozzle 5, and sensor holes 37, 37 with a predetermined depth are opened continuously with these grooves 36, 36. These grooves 36, 36 are arranged at the rear side relative to the sensor holes 37, 37. The lead wires 42 of the center temperature sensor 33 and the front end temperature sensor 34 are placed in these grooves 36, 36 and extend to the front of the injection nozzle 5, and then the sensor part 41 at the front end is inserted into the sensor holes 37, 37. The sensor part 41 includes, for example, a temperature sensing element.

[0062] In contrast, the rear end temperature sensor 32 is provided to measure the temperature of the portion of the injection nozzle 5 covered by the cylinder head 30, that is, near the rear end. That is, the cylinder head 30 becomes an obstacle in the installation of the rear end temperature sensor 32. Therefore, in the nozzle 5 according to the first embodiment, efforts have been made for the installation method of the rear end temperature sensor 32. The details are as follows. First, as Figure 3As shown in the figure, a groove 38 of a predetermined depth is formed on the outer peripheral surface of the main body 27 of the injection nozzle 5 from the vicinity of the flange 28, that is, the vicinity of the rear end toward the front end in the longitudinal direction. In addition, a sensor hole 39 of a predetermined depth is opened near the flange 28 in continuity with the groove 38. That is, the groove 38 is provided on the front end side, that is, the front side, compared with the sensor hole 39. It should be noted that in the present embodiment, the groove 38 has a length extending to the vicinity of the center of the main body 27, but it can also be formed to extend to the front end of the injection nozzle 5.

[0063] like Figure 2 As shown, the sensor portion 41 at the front end of the rear end temperature sensor 32 is placed in the sensor hole 39. In addition, the front end portion of the sensor portion 41 of the lead portion 42 of the rear end temperature sensor 32 is accommodated in the groove 38 and is pulled out to the outside near the center of the injection nozzle 5. Alternatively, the lead portion 42 of the rear end temperature sensor 32 may be placed in the groove 38 from the vicinity of the center of the injection nozzle 5 toward the rear end, and the sensor portion 41 at the front end may be placed in the sensor hole 39. Since the rear end temperature sensor 32 is provided on the injection nozzle 5 in this manner, it is not necessary to open a hole for placing the rear end temperature sensor 32 in the mounting and fixing member (i.e., the cylinder head 30) covering the flange portion 28 as in the comparative example described below.

[0064] [Comparative Example]

[0065] In order to understand that the installation method of the rear end temperature sensor 32 in the injection nozzle 5 according to the first embodiment is advantageous, Figure 4 An injection device 3X according to a comparative example in which an injection nozzle 5X is installed is described. Although a part of the components constituting the injection device 3X according to the comparative example is different from those in the first embodiment, most of the components are configured in the same manner as the injection device 3 according to the first embodiment. The same reference numerals are given to the same components and the description thereof is omitted. Similarly, regarding the components, configurations, etc. of the injection nozzle 5X according to the comparative example, the same reference numerals are given to the components, configurations, etc. that are the same as those of the injection nozzle 5 according to the first embodiment, and the description thereof is omitted.

[0066] The injection nozzle 5X according to the comparative example is also mounted on the heating cylinder 19 through the cylinder head 30X, but the cylinder head 30X is provided with a sensor insertion hole 45 for inserting the rear end temperature sensor 32X. The injection nozzle 5X is provided with a sensor hole 46 aligned with the sensor insertion hole 45. The rear end temperature sensor 32X is inserted from the sensor insertion hole 45, and the sensor portion 41 is placed in the sensor hole 46.

[0067] In the injection device 3X according to the comparative example, the temperature near the rear end of the injection nozzle 5X can also be measured by the rear end temperature sensor 32X. However, it is necessary to open a sensor insertion hole 45 in the cylinder head 30X. In the case of changing the position of the rear end temperature sensor 32X, there is the following problem: in order to change the position of the sensor insertion hole 45, it is necessary to newly open another sensor insertion hole 45. In addition, there is another problem. In order to insert the rear end temperature sensor 32X, it is necessary to align the sensor insertion hole 45 and the sensor hole 46. In order to achieve the alignment, the rotational position of the injection nozzle 5X relative to the cylinder head 30X must be adjusted. That is, the installation of the injection nozzle 5X to the heating cylinder 19 is complicated.

[0068] [Second Embodiment] <Injection Molding Machine>

[0069] pass Figure 5 , Figure 6 In the injection molding machine 1 according to the second embodiment, the mold clamping device 2 and the control device 4 are also connected to Figure 1 The injection molding machine 1, the mold clamping device 2, and the control device 4 according to the first embodiment shown are constructed in the same manner. Therefore, the description of these is omitted. In the injection device 3A, the mounting and fixing parts for mounting the injection nozzle 5 on the heating cylinder 19A are different. However, the other components of the injection device 3A are constructed in the same manner as the first embodiment, so the same figure numbers will be marked and the description will be omitted. In addition, the injection nozzle 5 is also constructed in the same manner as the first embodiment, so the description will be omitted.

[0070] <Injection Nozzle Mounting Adapter>

[0071] In the injection device 3A according to the second embodiment, as Figure 5 As shown, the mounting and fixing member for mounting the injection nozzle 5 on the heating cylinder 19A is composed of an injection nozzle mounting adapter 50. Figure 6 As shown, the injection nozzle mounting adapter 50 includes a cylindrical portion 51 and a hexagonal nut-shaped fastening portion 52, and a through hole 54 is opened in the axial direction. An external thread 55 is formed on the outer peripheral surface of the cylindrical portion 51, which is configured to be threadedly connected with an internal thread 57 formed at the front end of the heating cylinder 19A. The fastening portion 52 is configured to be used to rotate and fasten the injection nozzle mounting adapter by a wrench or the like.

[0072] In the second embodiment, a method for mounting the injection nozzle 5 to the heating cylinder 19A is described. Fig. 7A As shown in FIG. 1 , the rear end temperature sensor 32 is mounted on the injection nozzle 5. That is, the sensor portion 41 at the front end of the rear end temperature sensor 32 is accommodated in the sensor hole 39, and the front end of the sensor portion 41 of the lead portion 42 is accommodated in the groove 38. Next, as shown in FIG. Figure 7B As shown in FIG. 1 , the injection nozzle mounting adapter 50 is mounted to the injection nozzle 5. At this time, the lead wire portion 42 of the rear end temperature sensor 32 is inserted into the through hole 54 of the injection nozzle mounting adapter 50. Alternatively, the lead wire portion 42 may be inserted into the through hole 54 of the injection nozzle mounting adapter 50 in advance, as shown in FIG. Fig. 7A As shown, a rear end temperature sensor 32 is provided to the injection nozzle 5 .

[0073] When the injection nozzle mounting adapter 50 is mounted to the injection nozzle 5, the portion of the lead portion 42 that is further forward than the portion accommodated in the groove 38 is extended toward the front end in the axial direction along the outer peripheral surface of the main body portion 27. This makes it easy to mount the injection nozzle mounting adapter 50 to the injection nozzle 5. It should be noted that the main idea that the groove 38 can be formed up to the front end of the injection nozzle 5 has been described, and in the case where the groove 38 is formed up to the front end, it will be easier to mount. Figure 7C FIG. 5 shows a state where the injection nozzle mounting adapter 50 is mounted to the injection nozzle 5. Figure 7C In the illustrated state, a portion of the lead portion 42 that is further forward than the portion received in the groove 38 is appropriately bent.

[0074] like Fig.7D As shown, the external thread 55 of the injection nozzle mounting adapter 50 is screwed to the internal thread 57 formed in the heating cylinder 19A. When the fastening portion 52 is tightened by rotating it with a tool such as a wrench, the injection nozzle 5 is mounted to the heating cylinder 19A. Fig. 7E As shown, the center temperature sensor 33 and the front end temperature sensor 34 are mounted on the injection nozzle 5, and the nozzle heaters 26, 26, ... are mounted on the injection nozzle 5. As required, the adapter heater 59 can be provided at the fastening portion 52 of the injection nozzle mounting adapter 50. In the second embodiment, the rear end temperature sensor 32 is also provided without opening a hole in the mounting fixing member (i.e., the injection nozzle mounting adapter 50) to which the injection nozzle 5 is mounted.

[0075] [Third Embodiment] <Injection Molding Machine>

[0076] pass Figure 8 The third embodiment is described. In the injection molding machine 1 according to the third embodiment, the mold clamping device 2 and the control device 4 are also connected to Figure 1 The injection molding machine 1, the mold clamping device 2, and the control device 4 according to the first embodiment shown are configured in the same manner. Therefore, the description thereof is omitted. The injection device 3B and the injection nozzle 5B are different from the injection device 3 according to the first embodiment in several points. Only the differences are described, and the same reference numerals are given to the components configured in the same manner as the first embodiment, and the description thereof is omitted.

[0077] The injection device 3B according to the third embodiment is different from the first embodiment in that it has a shutoff nozzle 65. The shutoff nozzle 65 includes an injection nozzle 5B, a needle valve 66, a cylinder unit 67 that drives the needle valve 66, and a support member 69 that supports the cylinder unit 67. The injection nozzle 5B has the same structure as the injection nozzle 5 according to the first embodiment (see Figure 2 and Figure 3 ) but there are two differences. The first difference is that an inclined needle hole 71 is provided in the injection nozzle 5B, which extends from the outer peripheral surface of the main body 27 to the resin flow path 29. The needle valve 66 is set to be freely inserted into the needle hole 71, so that the resin flow path 29 is opened and closed. The second difference is that there are only two temperature sensors 32 and 33, namely the rear end temperature sensor 32 and the center temperature sensor 33. That is, there is no front end temperature sensor 34 (refer to Figure 2 ).

[0078] In the third embodiment, the method of mounting the injection nozzle 5B relative to the heating cylinder 19B is also different from that in the first embodiment. In the third embodiment, a nozzle mounting block 73 is provided at the front end of the heating cylinder 19B. The injection nozzle 5B contacts the injection nozzle mounting block 73 and is indirectly mounted on the heating cylinder 19B. Figure 2 ) Similarly, the injection nozzle 5B is mounted to the heating cylinder 19B in a manner that the flange portion 28 is pressed by the cylinder head portion 30. In the third embodiment, the rear end temperature sensor 32 is also provided without opening a hole in the mounting fixing component (i.e., the cylinder head portion 30) to which the injection nozzle 5B is mounted.

[0079] The invention created by the present inventors has been specifically described above based on the embodiments, but the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the invention. The multiple examples described above can also be combined as appropriate for implementation.

Claims

1. An injection nozzle, characterized in that: The injection nozzle is mounted on the front end of the heating cylinder of the injection device through a predetermined mounting and fixing component. The injection nozzle includes a rear end temperature sensor for measuring the temperature at the rear end of the heating cylinder. The injection nozzle has a groove of a predetermined length formed on the outer peripheral surface from the vicinity of the rear end portion toward the front end in the longitudinal direction of the injection nozzle, and a sensor hole of a predetermined depth is opened near the rear end portion continuously with the groove. The rear end temperature sensor includes a sensor portion at the front end and a wire portion, the sensor portion is placed in the sensor hole, a portion of the wire portion near the front end is accommodated along the groove, and is pulled out to the outside near the center of the injection nozzle.

2. The injection nozzle according to claim 1, characterized in that The injection nozzle has a flange portion with an enlarged diameter formed at a rear end portion, and the mounting and fixing member presses the flange portion toward the heating cylinder so that the injection nozzle is mounted to the heating cylinder.

3. The injection nozzle according to claim 2, characterized in that The sensor hole is opened in the vicinity of the flange portion.

4. The injection nozzle according to claim 1 or 2, characterized in that: The injection nozzle has an inclined hole extending from the outer peripheral surface to the inside of the resin flow path, and a tip of a needle valve driven to move forward and backward is inserted into the hole to open and close the resin flow path.

5. An injection device, characterized in that: include: Heating cylinder; A screw rod placed in the heating cylinder; as well as The injection nozzle is mounted on the front end of the heating cylinder by a predetermined mounting and fixing component. The injection nozzle includes a rear end temperature sensor for measuring the temperature at the rear end of the heating cylinder. The injection nozzle has a groove of a predetermined length formed on the outer peripheral surface from the vicinity of the rear end portion toward the front end in the longitudinal direction of the injection nozzle, and a sensor hole of a predetermined depth is opened near the rear end portion continuously with the groove. The rear end temperature sensor includes a sensor portion at the front end and a wire portion, the sensor portion is placed in the sensor hole, a portion of the wire portion near the front end is accommodated along the groove, and is pulled out to the outside near the center of the injection nozzle.

6. The injection device according to claim 5, characterized in that The injection nozzle has a flange portion with an enlarged diameter formed at a rear end portion, and the injection nozzle is mounted on the heating cylinder by being pressed toward the heating cylinder by the mounting and fixing member through the flange portion.

7. The injection device according to claim 6, characterized in that The sensor hole is opened in the vicinity of the flange portion.

8. The injection device according to claim 6 or 7, characterized in that: The front end side of the heating cylinder is formed with an internal thread. The outer peripheral surface of the mounting and fixing component is formed with an external thread, The injection nozzle is mounted on the heating cylinder by the flange portion being pressed toward the heating cylinder by the mounting and fixing member and the external thread being fastened to the internal thread.

9. The injection device according to claim 6 or 7, characterized in that: The front end surface of the heating cylinder is formed with a threaded hole. The flange portion is pressed by the mounting and fixing member, and the mounting and fixing member is fixed to the heating cylinder by bolts fastened to the threaded holes, so that the injection nozzle is mounted to the heating cylinder.

10. The injection device according to claim 5 or 6, characterized in that: The injection device comprises a needle valve and a driving mechanism for driving the needle valve. The injection nozzle has an inclined hole extending from the outer peripheral surface to the inner resin flow path. The needle valve is inserted into the hole and is driven to move forward and backward by the drive mechanism to open and close the resin flow path.

11. An injection molding machine, characterized in that: include: Injection device; as well as Clamping device, The injection device comprises: Heating cylinder; a screw rod placed in the heating cylinder; and The injection nozzle is mounted on the front end of the heating cylinder by a predetermined mounting and fixing component. The injection nozzle includes a rear end temperature sensor for measuring the temperature at the rear end of the heating cylinder. The injection nozzle has a groove of a predetermined length formed on the outer peripheral surface from the vicinity of the rear end portion toward the front end in the longitudinal direction of the injection nozzle, and a sensor hole of a predetermined depth is opened near the rear end portion continuously with the groove. The rear end temperature sensor includes a sensor portion at the front end and a wire portion, the sensor portion is placed in the sensor hole, a portion of the wire portion near the front end is accommodated along the groove, and is pulled out to the outside near the center of the injection nozzle.

12. The injection molding machine according to claim 11, characterized in that The injection nozzle has a flange portion with an enlarged diameter formed at a rear end portion, and the injection nozzle is mounted on the heating cylinder by being pressed toward the heating cylinder by the mounting and fixing member through the flange portion.

13. The injection molding machine according to claim 12, characterized in that The sensor hole is opened in the vicinity of the flange portion.

14. The injection molding machine according to claim 12 or 13, characterized in that: The front end side of the heating cylinder is formed with an internal thread. The outer peripheral surface of the mounting and fixing component is formed with an external thread, The injection nozzle is mounted on the heating cylinder by the flange portion being pressed toward the heating cylinder by the mounting and fixing member and the external thread being fastened to the internal thread.

15. The injection molding machine according to claim 12 or 13, characterized in that: The front end surface of the heating cylinder is formed with a threaded hole. The flange portion is pressed by the mounting and fixing member, and the mounting and fixing member is fixed to the heating cylinder by bolts fastened to the threaded holes, so that the injection nozzle is mounted to the heating cylinder.

16. The injection molding machine according to claim 11 or 12, characterized in that: The injection device comprises a needle valve and a driving mechanism for driving the needle valve. The injection nozzle has an inclined hole extending from the outer peripheral surface to the inner resin flow path. The needle valve is inserted into the hole and is driven to move forward and backward by the drive mechanism to open and close the resin flow path.

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