JP2013052572A - Resin-scattering prevention device for injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin-scattering prevention device for an injection molding machine which can sufficiently secure a distance between a shielding member and a nozzle by the turning of a shielding member for preventing injected resin from reaching a mold clamp part in a nozzle advancing direction, or a direction for securing the distance of the shielding member from the nozzle to shield a locate hole of a stationary platen.SOLUTION: The resin-scattering prevention device for the injection molding machine 10 preventing the injected resin from reaching the mold clamp part 14 includes the shielding member 50 turnable between a housed position which does not inhibit the nozzle 26 from advancing into a nozzle insertion hole 30 nor interfere with a screw cylinder 24 and a turned position in the advancing direction of the nozzle 26 from the housed position, the turned position shielding the locate hole 32 of the stationary platen 22.

Description

  The present invention relates to a resin scattering prevention device for an injection molding machine, and more specifically, used when purging by discharging molten resin remaining in an injection device from a nozzle tip when a resin used for injection molding is changed. The present invention relates to a resin scattering prevention device for an injection molding machine.

As shown in FIG. 11, the injection molding machine 10 includes a mold clamping unit 14 and an injection unit 16 on a machine base 12, and a control device 20 that controls the entire injection molding machine 10 is installed in the machine base 12. Yes. In the operation of changing the type of resin in the screw cylinder 24 provided in the injection unit 16 of the injection molding machine 10, the operation of injecting and discarding high-temperature resin from the screw cylinder 24 is called a purge operation. The injected resin is called purge waste material.
The mold exchanging work in the injection molding machine often involves a purge work (work for injecting resin to change the resin). If the mold change operation and the purge operation are performed simultaneously, the setup time can be shortened and the production efficiency can be improved.
However, if the purge operation is performed with no mold installed, the injected high-temperature resin passes through the fixed platen and reaches the mold clamping side, and the mold is replaced on the mold clamping side. There is a risk of burns. For this reason, it is difficult to perform the mold exchanging operation and the purging operation at the same time. As means for solving this, it is devised to provide a shielding member for preventing the injected resin from reaching the mold clamping part, as disclosed in the prior art (see FIGS. 12 and 13) and Patent Document 1. Has been.

Japanese Utility Model Publication 2-65515

In an injection molding machine, a screw size suitable for a molded product can usually be selected from a plurality of screw diameters. However, the larger the screw diameter, the longer the overall cylinder length. On the other hand, since the reverse stroke of the injection unit is limited by the machine, the longer the cylinder, the closer the nozzle tip position during the purging operation approaches the fixed platen.
FIG. 12 is a diagram illustrating a conventional shielding member. FIG. 13 is a view of the cross-section of the two-dot chain line in FIG. 12 as viewed in the direction of the arrow. As shown in FIG. 12, the fixed platen 22 provided in the mold clamping unit 14 is connected to a rear platen (not shown) by a tie bar 28, and a fixed side die (not shown) is fixed to the fixed platen 22. The injection unit 16 includes an injection device 18 and a screw cylinder 24 to which a nozzle 26 for discharging molten resin is attached at the tip. In the molding operation, the nozzle 26 is inserted into the nozzle insertion hole 30 and pressed against a fixed mold (not shown), and then the molten resin is injected into the mold cavity.

  The shielding member 36 is used so that a purge operation (operation of injecting resin to change the resin) can be performed safely. Since the shielding member 36 is a slide type, it is necessary to arrange it between the fixed platen 22 and the injection device 18. When performing the purge operation, the shielding member 36 is positioned so as to shield the nozzle insertion hole 30. When the purge operation is completed and the molding operation is executed, the shielding member 36 slides the support member 34 to retract the nozzle insertion hole 30 to a position where it is not shielded, as shown in FIG. The purge receiving device disclosed in Patent Document 1 has a structure in which the shielding member functions by moving to the vicinity of the outer periphery of the stationary platen on the injection device side.

Therefore, particularly when the total length of the screw cylinder 24 is long and the tip of the nozzle 26 is positioned in the vicinity of the fixed platen 22, a sufficient distance between the shielding member 36 and the nozzle 26 cannot be ensured. When the purge operation is executed in such a positional relationship, the injected resin (purge waste material 40) hits the shielding member and rebounds to the nozzle 26 side, covering the nozzle 26 with the resin, and normal purge operation cannot be performed. As described above, it is difficult to install a shielding member used for safely performing the purge operation.
Therefore, in view of the above-described problems of the prior art, the object of the present invention is to provide a shielding member that prevents the injected resin from reaching the mold clamping portion, and ensures the nozzle advance direction, that is, the distance from the nozzle to the shielding member. It is an object of the present invention to provide a resin scattering prevention device for an injection molding machine that can sufficiently secure a distance between a shielding member and a nozzle by turning in a direction and shielding a locating hole of a stationary platen.

The invention according to claim 1 of the present application provides a resin scattering prevention device for an injection molding machine that prevents the injected resin from reaching the mold clamping part, and does not hinder the forward movement of the nozzle to the nozzle insertion part and is a screw cylinder. And a shielding member capable of pivoting between a retracted position that does not interfere with the shield and a shield position that is pivoted from the retracted position in the nozzle forward direction and shields the locating hole of the stationary platen. This is a resin scattering prevention device of a molding machine.
The invention according to claim 2 is the resin for an injection molding machine according to claim 1, wherein a rotation shaft that rotatably supports the shielding member is provided on a stationary platen, a machine base, or a screw cylinder. It is a scattering prevention device.
The invention according to claim 3 is the resin scattering prevention device for an injection molding machine according to claim 1, wherein the shielding member is divided into a plurality of parts.

The invention according to claim 4 is the injection molding machine according to any one of claims 1 to 3, wherein the rotation shaft is a mechanism that rotates while supporting both ends of the shielding member. This is a resin scattering prevention device.
The invention according to claim 5 is characterized in that the shielding member has a structure that is bent in the direction of the locate hole and both ends are supported by the rotation shaft. This is an apparatus for preventing resin scattering in an injection molding machine.

  According to the present invention, the shielding member that prevents the injected resin from reaching the mold clamping portion rotates in the nozzle advance direction, that is, the direction in which the shielding member secures the distance from the nozzle, thereby locating the fixed plate. By shielding this, it is possible to provide a resin scattering prevention device for an injection molding machine that can secure a sufficient distance between the shielding member and the nozzle.

It is an external appearance perspective view for demonstrating the main structures in the 1st Embodiment of this invention. It is a figure explaining the state (storage position) of the shielding member at the time of the 1st Embodiment of this invention shown by FIG. 1 operate | moving. It is a figure explaining the state (in the middle of rotation) of the shielding member at the time of embodiment of this invention shown by FIG. It is a figure explaining the state (shielding position) of the shielding member at the time of embodiment of this invention shown by FIG. It is a figure explaining the state (storage position) of the shielding member at the time of embodiment of this invention operating in the example where the shielding member used for embodiment of this invention was divided | segmented into plurality. It is a figure explaining the state (in the middle of rotation) of the shielding member when the embodiment of the present invention operates in the example in which the shielding member used in the embodiment of the present invention is divided into a plurality of parts. It is a figure explaining the state (shielding position) of the shielding member at the time of embodiment of this invention operating in the example by which the shielding member used for embodiment of this invention was divided | segmented into plurality. It is a figure explaining the example in which the rotating shaft which rotates the shielding member used for embodiment of this invention was installed in the machine base. It is an example in which the rotating shaft for rotating the shielding member used in the embodiment of the present invention is installed in the screw cylinder, and is a diagram illustrating a state where the shielding member is in the shielding position. It is an example in which the rotation shaft for rotating the shielding member used in the embodiment of the present invention is installed in the screw cylinder, and is a diagram for explaining a state where the shielding member is in the storage position. It is a figure explaining the purge operation | work in an injection molding machine. It is a figure explaining the shielding member of a prior art. It is the figure which looked at the cross section of the dashed-two dotted line of FIG. 12 in the arrow direction.

Embodiments of the present invention will be described below. In addition, the same code | symbol is demonstrated about the structure which is the same as that of a prior art, or similar.
FIG. 1 is an external perspective view for explaining a main configuration in the first embodiment of the present invention. It is the figure which looked at the part of the nozzle insertion hole 30 of the stationary platen 22 from the injection part 16 side. The shielding member 50 is a plate-like member having a substantially U-shape formed along the curved surface of the inner periphery of the nozzle insertion hole 30 provided in the fixed platen 22. The side close to the locating hole 32 of the shielding member 50 is bent toward the center of the locating hole 32. The shielding member 50 is pivotally supported by pivot shafts 54a and 54b provided on pivot shaft support members 52a and 52b whose both ends are fixed to the fixed platen 22. In the present embodiment, a line segment connecting the rotation shaft 54a and the rotation shaft 54b is disposed so as to intersect the central axis of the nozzle insertion hole 30.
In FIG. 1, the rotation shaft 54a and the rotation shaft 54b are axes that are horizontal with respect to the base surface, but the rotation shaft may be perpendicular to the base surface or in any direction.

  The retracted position of the shielding member 50 shown in FIG. 1 in the nozzle insertion hole 30 is in a retracted position so that the molding operation can be performed. When performing the purge operation, the screw cylinder 24 is moved backward in the direction away from the fixed platen 22 by driving the injection device 18. When performing the purging operation, the operator rotates the gripping portion provided on the shielding member 50 so that the high temperature molten resin (purge waste material 40) does not scatter over the locating hole 32 and to the mold clamping portion 14 side. The shielding member 50 can be rotated to a position where the locating hole 32 is shielded by pulling around the shafts 54a and 54b. Or it is good also as a structure automatically rotated by the drive motor which is not illustrated controlled by the control apparatus 20. FIG.

  Next, the operation of the embodiment of the present invention including the shielding member 50 described with reference to FIG. 1 will be described with reference to FIGS. FIG. 2 is a view for explaining the state (storage position) of the shielding member 50 when the first embodiment of the present invention shown in FIG. 1 operates. FIG. 3 is a view for explaining the state (in the middle of rotation) of the shielding member 50 when the embodiment of the present invention shown in FIG. 1 operates. FIG. 4 is a view for explaining the state (shielding position) of the shielding member 50 when the embodiment of the present invention shown in FIG. 1 operates. Here, the rotating shaft support members 52 a and 52 b are attached to the stationary platen 22.

The shielding member 50 shown in FIG. 2 is normally positioned at a position that does not hinder the execution of the molding operation using the injection molding machine 10 (storage position). In this embodiment, the lower portion of the nozzle insertion hole 30 is the storage position.
When the operator performs the purge operation, before starting the purge operation, the operator pulls the holding member (not shown) to rotate the shielding member 50 around the rotation shafts 54a and 54b in the direction of shielding the locate hole 32. . FIG. 3 illustrates a state in which the shielding member 50 is rotating in the direction of shielding the locate hole 32. By rotating the shielding member 50 in this manner, the substantially U-shaped portion of the shielding member 50 rotates in the forward direction of the nozzle 26 relative to the stationary platen 22, that is, in the direction in which the shielding member 50 secures the distance from the nozzle 26. Since the locating hole 32 of the fixed platen 22 is moved and shielded, the separation distance between the surface of the shielding member 50 facing the nozzle 26 and the tip of the nozzle 26 can be sufficiently secured. The purge waste material 40 received by the shielding member 50 flows downward, flows down to the purge waste material flow path 38, further flows down the purge waste material flow path 38, and the purge waste material 40 is collected in a collection tray (not shown).

  Then, as shown in FIG. 4, the shielding member 50 is positioned at the shielding position where the shielding member 50 completely shields the locate hole 32 (shielding position), and is locked by a lock mechanism (not shown). By providing the lock mechanism, it is possible to prevent the shielding member 50 from being rotated accidentally and the locating hole 32 from being unshielded. It should be noted that the broken line of the locate hole 32 indicates that the locate hole 32 is shielded by the shielding member 50.

  The embodiment of the present invention in which the shielding member includes one shielding member 50 has been described with reference to FIGS. 1, 2, 3, and 4. In the embodiment of the present invention, the number of shielding members is not limited to one, and a plurality of shielding members may be used. When the injection molding machine 10 is large, the inner diameter of the locate hole 32 is also increased. If it does so, the shielding member which shields the locate hole 32 will also become large sized, and the case where it is difficult to rotate manually arises. Moreover, the operation | work which attaches a large sized shielding member to a narrow space also becomes difficult. Then, the said problem can be solved by dividing | segmenting a shielding member into plurality.

  An embodiment of the present invention provided with shielding members 60 and 61 when there are two shielding members will be described with reference to FIGS. FIG. 5 is a diagram for explaining the state (storage position) of the shielding member when the embodiment of the present invention operates in an example in which the shielding member used in the embodiment of the present invention is divided into two. In this embodiment, two shielding members 60 and a shielding member 61 are provided. The storage position of the shielding member 61 is the lower part of the nozzle insertion hole 30 similarly to the storage position of the shielding member 50 shown in FIG. The storage position of the shielding member 61 is a position facing the shielding member 60 in the nozzle insertion hole 30.

The shielding members 60 and 61 are substantially U-shaped plate-like members formed along the curved surface of the inner periphery of the nozzle insertion hole 30 provided in the fixed platen 22. The shielding member 60 is pivotally supported by pivot shafts 64a ₁ and 64b ₁ provided on pivot shaft support members 62a and 62b fixed to the stationary platen 22 at both ends. The shielding member 61 is pivotally supported by pivot shafts 64a ₂ and 64b ₂ provided on pivot shaft support members 62a and 62b fixed to the fixed plate 22 at both ends. In this embodiment, the line segment connecting the rotation shaft 64a ₂ and the rotation shaft 64b ₂ is arranged so as to intersect with the central axis of the nozzle insertion hole 30. In this embodiment, the rotation shafts 64a ₁ and 64a ₂ are provided on a single rotation shaft support member 62a. Similarly, the rotation shafts 64b ₁ and 64b ₂ are provided on the single rotation shaft support member 62b. These rotating shaft support members 62 a and 62 b are attached to the fixed platen 22. Incidentally, each of the pivot shafts _{64a 1, 64a 2, 64b 1} , 64b 2 and may be constituted by independent rotating shaft support member.

The storage position of the shielding members 60 and 61 shown in FIG. 5 in the nozzle insertion hole 30 is in a retracted position so that the molding operation can be performed. When performing the purge operation, the screw cylinder 24 is moved backward in the direction away from the fixed platen 22 by driving the injection device 18. When performing the purge operation, the operator holds the unillustrated grip provided on the shielding members 60 and 61 so that the molten resin (purge waste material 40) does not scatter over the locate hole 32 and to the mold clamping unit 14 side. The shielding members 60 and 61 can be rotated to a position where the part is pulled around the rotation shafts 64a ₁ and 64b ₁ and the rotation shafts 64a ₂ and 64b _{2 and} the locating hole 32 is shielded. Or it is good also as a structure automatically rotated by the drive motor which is not illustrated controlled by the control apparatus 20. FIG.

  FIG. 6 is a diagram for explaining the state (in the middle of rotation) of the shielding member when the embodiment of the present invention operates in an example in which the shielding member used in the embodiment of the present invention is divided into two. The shielding member 60 rotates in a direction in which the nozzle 26 advances toward the stationary platen 22, that is, in a direction in which the shielding member 60 secures a distance from the nozzle 26, thereby shielding the locating hole 32 of the stationary platen 22. Similarly, the shielding member 61 rotates in a direction of moving forward toward the fixed platen 22 of the nozzle 26, that is, in a direction in which the shielding member 61 secures a distance from the nozzle 26 to shield the locating hole 32 of the fixed platen. . In this embodiment, the locating hole 32 is shielded by the shielding member 60 and the shielding member 61.

  FIG. 7 is a diagram illustrating a state (shielding position) of the shielding member when the embodiment of the present invention operates in an example in which the shielding member used in the embodiment of the present invention is divided into two. The shielding members 60 and 61 are positioned at the shielding position where the locating hole 32 is completely shielded by the shielding member 60 and the shielding member 61 (shielding position) and fixed by a lock mechanism (not shown). By providing the lock mechanism, it is possible to prevent the shielding members 60 and 61 from being rotated accidentally and the locating hole 32 from being unshielded.

In the embodiment of the present invention described above, the rotation shaft support members 52 a, 52 b, 62 a, 62 b that support the rotation shaft of the shielding member are attached to the stationary platen 22. These rotating shaft support members 52 a, 52 b, 62 a and 62 b may be attached to elements constituting the injection molding machine 10 other than the fixed platen 22.
FIG. 8 is a view for explaining an example in which a rotating shaft for rotating the shielding member used in the embodiment of the present invention is installed in the machine base 12. The difference between the embodiment of the present invention shown in FIG. 8 and the embodiment of the present invention shown in FIG. 2 is that a rotating shaft support member provided with rotating shafts 74a and 74b for rotatably supporting the shielding member 70. The lower portions of 72 a and 72 b are attached to the machine base 12. Other configurations are the same as those described with reference to FIG. It should be noted that the broken line of the locate hole 32 indicates that the locate hole 32 is shielded by the shielding member 70.

  9 and 10 are diagrams illustrating an embodiment in which the rotation shaft is installed in the screw cylinder. FIG. 9 is a diagram illustrating a state where the shielding member is in the shielding position. Moreover, FIG. 10 is a figure explaining the state which has a shielding member in a storing position. In the embodiment of the present invention shown in FIGS. 9 and 10, the rotation shaft support members 82 a and 82 b including the rotation shafts 84 a and 84 b that rotatably support the shielding member 80 are attached to the side surface of the screw cylinder 24. It has been. In this embodiment, the shielding member 80 has a substantially U-shape so as to cover both side surfaces of the nozzle 26. The rotating shaft support member 82 b and the rotating shaft 84 b are hidden behind the screw cylinder 24.

  When performing the molding operation, the shielding member 80 is stored at the storage position so as to cover the upper, left and right side surfaces of the screw cylinder 24 as shown in FIG. When performing the purge operation, before starting the purge operation, the shielding member 80 is rotated around the rotation shafts 84a and 84b in the direction of shielding the locating hole 32 by pulling a grip portion (not shown). By rotating the shielding member 80 in this way, the U-shaped portion of the shielding member 80 rotates in the forward direction of the nozzle 26 with respect to the stationary platen 22, that is, the direction in which the shielding member 80 secures the distance from the nozzle 26. Since the locate hole 32 of the fixed platen 22 is shielded, a sufficient separation distance between the shielding member 80 and the tip of the nozzle 26 can be ensured.

  As described above, in each embodiment of the present invention, the shielding members 50, 60, 61, 70, 80 that prevent the injected resin from reaching the mold clamping unit 14 are connected to the nozzle insertion hole 30 of the stationary platen 22. The nozzle 26 is stored in a position that does not hinder the forward movement of the nozzle 26, and can be rotated from the stored position in the nozzle forward direction to shield the locate hole 32 of the stationary platen 22.

DESCRIPTION OF SYMBOLS 10 Injection molding machine 12 Machine stand 14 Clamping part 16 Injection part 18 Injection apparatus 20 Control apparatus 22 Fixed board 24 Screw cylinder 26 Nozzle 28 Tie bar 30 Nozzle insertion hole 32 Locating hole 34 Support member 36 Shielding member 38 Purge waste material flow path 40 Purge Scrap wood

50 Shielding member 52a, 52b Rotating shaft support member 54a, 54b Rotating shaft

60 and 61 the shield member 62a, 62b pivot shaft support member _{64a 1, 64a 2, 64b 1} , 64b 2 pivot shaft

70 Shielding member 72a, 72b Rotating shaft support member 74a, 74b Rotating shaft

80 Shielding member 82a, 82b Rotating shaft support member 84a, 84b Rotating shaft

Claims (5)

In the resin splash prevention device of the injection molding machine that prevents the injected resin from reaching the mold clamping part,
Between the storage position that does not interfere with the forward movement of the nozzle to the nozzle insertion part and does not interfere with the screw cylinder, and the shielding position that is rotated in the nozzle forward direction from the storage position and shields the locating hole of the fixed platen A resin scattering prevention device for an injection molding machine, characterized in that a rotatable shielding member is provided.   2. The resin scattering prevention device for an injection molding machine according to claim 1, wherein a rotation shaft that rotatably supports the shielding member is provided on a stationary platen, a machine base, or a screw cylinder.   The resin scattering prevention device for an injection molding machine according to claim 1, wherein the shielding member is divided into a plurality of parts.   The resin scattering prevention device for an injection molding machine according to any one of claims 1 to 3, wherein the rotation shaft is a mechanism that rotates while supporting both end portions of the shielding member.   5. The resin scattering prevention of an injection molding machine according to claim 1, wherein the shielding member has a structure that is bent in the direction of the locate hole and is supported at both ends by the rotation shaft. apparatus.

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