Injection device, and injection molding machine

Abstract

To provide an injection device which has no risk of a person and an article getting caught in a cable carrier.SOLUTION: An injection device (3) comprises: a screw drive device (22) slidably provided on a bed (B); a heating cylinder (19) horizontally attached in front of the screw drive device (22); and a screw (20) which is put in the heating cylinder (19) to be driven by the screw drive device (22). In the injection device (3), a cable for connecting the inside of the bed (B) and the screw drive device (22) is supported by a cable carrier (35). The cable carrier (35) is put into a cover (32) covering the screw drive device (22).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a horizontal injection molding machine including an injection unit provided on a bed, and an injection unit and a mold clamping unit. [Background technology]

[0002] An injection molding machine includes a clamping device that clamps a mold, an injection device that melts an injection material and injects it into the mold, and the like. A so-called horizontal injection molding machine includes a clamping device provided on a bed, and an injection device provided on the bed to the side of the clamping device, as described in Patent Document 1, for example. The injection device is provided slidably on the bed, and when it slides toward the clamping device, i.e., forward, the injection nozzle of the injection device touches the mold provided in the clamping device. When it slides in the opposite direction, i.e., backward, the injection nozzle moves away from the mold. The injection device is rotated during maintenance of the injection device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-162595 Summary of the Invention [Problem to be solved by the invention]

[0004] A plurality of cables extending from within the bed are connected to the injection device. A certain amount of slack is ensured in these cables so that they do not interfere with the forward and backward movement of the injection device on the bed. In order to prevent the cables from being damaged or entangled, the cables are supported and protected by a cable carrier (registered trademark). The cable carrier is freely curved over its entire length, and is divided into a lower section that extends linearly on the bed, a folded section that curves from the lower section and turns back to the upper side, and an upper section that extends linearly from the folded section and is connected to the injection device. The folded section changes in accordance with the forward and backward sliding of the injection device. When this folded section moves toward the injection nozzle, there is a risk of it getting caught up in debris such as material waste.

[0005] The present disclosure provides an ejection device that is free from the risk of dust or other foreign matter getting caught in the cable carrier.

[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 device includes a screw drive device slidably provided on the bed, a heating cylinder horizontally attached to the front of the screw drive device, and a screw that is inserted in the heating cylinder and driven by the screw drive device. In the injection device, a cable connecting the inside of the bed and the screw drive device is supported by a cable carrier. In the present disclosure, the cable carrier is configured to be inserted in a cover that covers the screw drive device. Effect of the Invention

[0008] The present disclosure can prevent debris and the like from becoming entangled in a cable carrier. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a rear view showing the injection molding machine according to the present embodiment. [Diagram 2] FIG. 1 is a top view of an injection molding machine according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a rear view showing a part of the injection device according to the present embodiment. [Figure 4] FIG. 2 is a top view showing a part of the injection device according to the present embodiment. [Diagram 5] FIG. 2 is a top view showing a part of the injection device according to the present embodiment. [Figure 6] FIG. 2 is a top view showing an injection molding machine according to a comparative example. [Figure 7] FIG. 4 is a top view showing a part of an injection device according to a comparative example. 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] [Present embodiment] <Injection molding machine> 1, an injection molding machine 1 according to this embodiment includes a mold clamping unit 2 provided on a bed B, an injection unit 3 provided on the bed B to the side of the mold clamping unit 2, and a controller 4 that controls these. Since FIG. 1 is a rear view of the injection molding machine 1 as seen from the rear side, i.e., from the opposite side to the side where the machine is operated, the controller 4 is shown behind the injection unit 3.

[0012] <Mold clamping device> The mold clamping device 2 includes a fixed platen 7 fixed to a bed B, a movable platen 8 slidably provided on the bed B, and a mold clamping housing 9. The fixed platen 7 and the mold clamping housing 9 are connected by a plurality of tie bars 11, 11, ..., and the movable platen 8 is slidably provided between the fixed platen 7 and the mold clamping housing 9. A mold clamping mechanism, i.e., a toggle mechanism 13, is provided between the mold clamping housing 9 and the movable platen 8. A fixed side mold 15 and a movable side mold 16 are provided on the fixed platen 7 and the movable platen 8, respectively. Therefore, when the toggle mechanism 13 is driven, the molds 15 and 16 are opened and closed. The mold clamping device 2 is covered by a safety cover 17 as shown by a two-dot chain line in FIG. 1. In other words, since the movable part is not exposed, it is possible to prevent the inclusion of dust such as material waste.

[0013] <Injection device> The injection device 3 includes a heating cylinder 19, a screw 20 provided in the heating cylinder 19, and a screw drive device 22 for driving the screw 20. The screw drive device 22 is composed of a base 26 that is slidable forward with respect to the bed B, i.e., toward the mold clamping device 2, and backward in the opposite direction, and a screw drive device main body 28 that is mounted on the base 26 so as to be rotatable via a rotating shaft 27. The heating cylinder 19 is attached horizontally to the front of the screw drive device main body 28. The heating cylinder 19 is provided with a hopper 23 and an injection nozzle 24, and a flange portion 30 is formed near the hopper 23. A cooling hose for cooling the vicinity of the connection between the hopper 23 and the heating cylinder 19 is connected to the flange portion 30, but the cooling hose is not shown in the figure.

[0014] 1 and 2, the screw drive unit 22 of the injection unit 3 is entirely covered by a cover 32. Since the movable parts are covered by the cover 32, safety is ensured without causing people or objects to become entangled.

[0015] <Cable carrier> The injection device 3 according to this embodiment is provided with a cable carrier 35 that supports a plurality of cables connecting the bed B and the injection device 3. The cable carrier 35 is shown enlarged in Figs. 3 and 4. However, the cables are not shown. The cable carrier 35 is made up of a plurality of members connected to each other and is configured to be bendable over its entire length. The cable carrier 35 is made up of three sections. That is, a lower section 37 that is connected to the bed B side and extends linearly, a turn-back section 38 that is bent upward from the lower section 37, and an upper section 39 that extends linearly from the turn-back section 38. The upper section 39 is connected to the screw drive device main body 28 by a fixing member 40.

[0016] When the screw drive device 22 advances, the lower section 37 becomes shorter and the upper section 39 becomes longer. On the other hand, when the screw drive device 22 retreats, the lower section 37 becomes longer and the upper section 39 becomes shorter. In other words, the lengths of the lower section 37 and the upper section 39 change and the position of the turn-back section 38 changes in accordance with the forward and backward sliding of the screw drive device 22. Note that in Figure 4, the lower section 37 is shown hatched and the upper section 39 is shown without hatching.

[0017] In this embodiment, the cable carrier 35 has several features. These features will be explained. The first feature is that the cable carrier 35 is housed in the cover 32 that covers the screw drive unit 22. The position of the curved turn-back section 38 of the cable carrier 35 changes in accordance with the sliding of the injection unit 3, but since it is housed in the cover 32, it is possible to prevent objects from being pinched.

[0018] The second feature is that the cable carrier 35 is disposed to the side of the screw drive device 22. Since the cable carrier 35 is not disposed to the side of the heating cylinder 19, the cable carrier 35 does not interfere with the supply of injection material to the hopper 23. In addition, even if the cooling water supplied to the flange portion 30 leaks, there is no risk of the water getting on the cable supported by the cable carrier 35.

[0019] The third feature consists of a number of points. That is, the folded section 38 of the cable carrier 35 is disposed rearward relative to the lower section 37 and the upper section 39, the lower section 37 is placed on a support plate 42, the upper section 39 is connected to the screw drive device main body 28, etc. And the support plate 42 is rotatable about a rotation pin 43 fixed to the bed B. Due to these points, in the injection device 3 according to this embodiment, when the screw drive device main body 28 turns relative to the bed B, the cable carrier 35 also turns following it with almost no twisting, as will be described later.

[0020] Another feature is that the support plate 42 is placed on the bed B via a friction reduction plate 45. In this embodiment, the friction reduction plate 45 is made of MC Nylon (registered trademark) and is designed to reduce friction when the support plate 42 rotates. The friction reduction plate 45 may be made of other materials, such as fluororesin. Another feature is that the support plate 42 is provided with a guard portion 47. The guard portion 47 prevents an operator from inserting his or her hand, further ensuring safety.

[0021] <Rotation of the injection unit> The movement of the cable carrier 35 when the injection device 3 according to this embodiment is rotated will be described. As shown in FIG. 5, the injection device 3 is rotated about the rotation axis 27. That is, the screw drive device main body 28 is rotated. Then, since the upper section 39 of the cable carrier 35 is fixed to the screw drive device main body 28 by the fixing member 40, it rotates together with the screw drive device main body 28. When the upper section 39 rotates, the turn-back section 38 rotates, and a force in the rotation direction acts on the lower section 37. The lower section 37 is placed on a support plate 42 that can rotate around a rotation pin 43, and the rotation pin 43 is provided near the end of the lower section 37 far from the turn-back section 38 and is fixed to the bed B. Therefore, the lower section 37 rotates together with the support plate 42 around the rotation pin 43. That is, the cable carrier 35 rotates without being twisted as a whole.

[0022] [Comparative Example] A comparative example in which the position of the cable carrier 35 is changed in the injection molding machine 1 (see Figs. 1 and 2) according to this embodiment will be described with reference to Fig. 6. In the injection molding machine 1x according to the comparative example, the other members than the cable carrier 51 are configured in the same manner as in the injection molding machine 1 (see Figs. 1 and 2) according to this embodiment, so the same reference numbers are used and the description will be omitted.

[0023] As shown in Fig. 6, the cable carrier 51 provided in the injection unit 3x in the injection molding machine 1x according to the comparative example is disposed in front of the screw drive unit 22 and to the side of the heating cylinder 19. The cable carrier 51 is divided into a lower section 53 fixed to the bed B, a turn-back section 54 connected to the lower section 53, and an upper section 55 connected to the turn-back section 54. The upper section 55 is connected to the screw drive unit 22 as follows. First, a protrusion 58 is provided on the screw drive unit 22, and a support plate 60 is provided rotatably relative to the protrusion 58 via a rotation pin 59. The upper section 55 is fixed to the support plate 60.

[0024] In the injection molding machine 1x according to the comparative example, the cable carrier 51 is exposed, so there is a risk that dirt or the like may get caught in the cable carrier 51 when the injection unit 3x moves forward or backward. In addition, since the cable carrier 51 is disposed to the side of the heating cylinder 19, the cable carrier 51 may get in the way when the injection material is supplied to the hopper 23. Furthermore, if there is a leak of cooling water that cools the connection between the hopper 23 and the heating cylinder 19, the cable carrier 51 may get wet.

[0025] In the injection molding machine 1x according to the comparative example, the cable carrier 51 is twisted when the injection device 3x is rotated. This will be explained. FIG. 7 shows the state when the injection device 3x, i.e., the screw drive device 22, is rotated around the rotation axis 27. When the screw drive device 22 is rotated, the rotation pin 59 also rotates along with the protrusion 58. This causes the position of the support plate 60 to change. As the position of the support plate 60 changes, the position of the upper section 55 of the cable carrier 51 also changes. The lower section 53 of the cable carrier 51 is fixed to the bed B at the position indicated by the reference symbol 62. This causes the cable carrier 51 to twist as shown in FIG. 7. Although a certain degree of twisting is permitted in the cable carrier 51 and is not a problem, it can be seen that a slight load is applied to the cable carrier 51.

[0026] 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]

[0027] 1 Injection molding machine 2 Mold clamping device 3 Injection unit 4 Controller 7 Fixed plate 8 Movable plate 9 Clamping housing 11 Tie bar 13 Toggle mechanism 15 Fixed side mold 16 Movable mold 17 Safety cover 19 Heating cylinder 20 Screw 22 Screw drive device 23 Hopper 24 Injection nozzle 26 Base 27 Swivel shaft 28 Screw drive device main body 30 Flange portion 32 Cover 35 Cable carrier 37 Lower section 38 Turning section 39 Upper section 40 Fixing member 42 Support plate 43 Rotating pin 45 Friction reduction plate 47 Guard Section

Claims

1. a screw drive device slidably provided on the bed; a heating cylinder mounted horizontally in front of the screw drive; a screw that is accommodated in the heating cylinder and is adapted to be driven by the screw drive device; a cable carrier for supporting a cable connecting the inside of the bed and the screw drive device, the cable carrier is freely bendable over its entire length, and is divided into a lower section connected to the bed side and extending linearly, a folded section curved so as to fold back upward from the lower section, and an upper section extending linearly from the folded section and connected to the screw drive device, and the position of the folded section changes in accordance with the sliding of the screw drive device, The injection device, wherein the cable carrier is housed in a cover that covers the screw drive device.

2. The injection device according to claim 1 , wherein the cable carrier is folded back such that the folded back section is positioned rearward relative to the upper section and the lower section.

3. 3. The injection device according to claim 1, wherein the cable carrier is provided on a side of the screw drive device.

4. The screw drive device is composed of a base that is slidably mounted on a bed, and a screw drive device main body that is mounted on the base and can rotate around a rotation axis that is fixed to the base, 3. The injection device according to claim 1, wherein the cable carrier has an upper section connected to the screw drive device main body, and a lower section housed on a support plate attached to the bed so as to be rotatable around a rotation pin fixed to the bed.

5. The injection device according to claim 4 , wherein the support plate is placed on the bed via a friction reduction plate.

6. A mold clamping device provided on the bed; an injection unit provided on the bed to the side of the mold clamping unit, The injection device includes a screw drive device slidably provided on the bed; a heating cylinder mounted horizontally in front of the screw drive; a screw that is accommodated in the heating cylinder and is adapted to be driven by the screw drive device; a cable carrier for supporting a cable connecting the inside of the bed and the screw drive device, the cable carrier is freely bendable over its entire length, and is divided into a lower section connected to the bed side and extending linearly, a folded section curved so as to fold back upward from the lower section, and an upper section extending linearly from the folded section and connected to the screw drive device, and the position of the folded section changes in accordance with the sliding of the screw drive device, The cable carrier is housed in a cover that covers the screw drive device.

7. The injection molding machine according to claim 6 , wherein the cable carrier is folded back such that the folded back section is positioned rearward relative to the upper section and the lower section.

8. 8. The injection molding machine according to claim 6, wherein the cable carrier is provided on a side of the screw drive device.

9. The screw drive device is composed of a base that is slidably mounted on a bed, and a screw drive device main body that is mounted on the base and can rotate around a rotation axis that is fixed to the base, 8. The injection molding machine according to claim 6, wherein the cable carrier has an upper section connected to the screw drive device main body, and a lower section housed on a support plate attached to the bed so as to be rotatable about a rotation pin fixed to the bed.

10. The injection molding machine according to claim 9 , wherein the support plate is placed on the bed via a friction reduction plate.

Images