JP5634886B2 - Torpedo - Google Patents

Description

  The present invention relates to a torpedo, and more specifically, a substantially cylindrical main body having a blade formed on the outer surface so that a gap is formed with respect to the inner inner surface of the nozzle case, and a tip of the main body. The present invention relates to a torpedo including a needle pin that can advance and retract in the axial direction.

  Conventionally, when the molten resin formed by melting the pellets fed into the gap formed on the inner surface of the nozzle case exceeds a predetermined pressure when assembled inside the nozzle case, the mold cavity assembled to the nozzle case A torpedo in which a needle pin opens a communicating gate is already known. Here, Patent Document 1 below discloses a torpedo in which a blade is formed in a spiral shape. Thereby, the efficiency of plasticization of a pellet can be improved.

JP 2005-246951 A

  However, in the above-described prior art, since the blade is formed in a spiral shape, there has been a problem that labor and cost are required for processing the spiral.

  An object of the present invention is to provide a torpedo capable of easily processing a blade while further improving the efficiency of plasticization of pellets.

The present invention is for achieving the above object, and is configured as follows.
According to the first aspect of the present invention, there is provided a substantially cylindrical main body having a blade formed on the outer surface so that a gap is formed with respect to the inner surface when the nozzle case is assembled. The needle pin opens the gate that communicates with the cavity of the mold assembled to the nozzle case when the molten resin made by melting the pellets sent into the gap exceeds the specified pressure. The blades are configured to be uniform in the circumferential direction of the main body so as to be along the axial direction of the main body, and to be staggered in the circumferential direction of the main body with the middle position in the axial direction as a boundary. formed with a plurality, in the body, the hollow spigot tip end communicates with the outside are formed along the axial direction, the needle pin, through the strain relief present When the needle pin advances from the tip of the main body, the overhanging portion formed on the outer peripheral surface of the needle pin is attached to the tip side of the insertion portion. It is the structure characterized by being comprised by interfering with an inner edge .
According to this configuration, the pellets fed into the gap come into contact with many blades, and this contact area can be increased. Therefore, the pressure which a pellet receives rises more and it can improve the plasticization efficiency of a pellet more. Also, since the shape of the blade is simply a straight line, unlike the prior art, the processing can be simplified.

FIG. 1 is an overall perspective view of a torpedo in an embodiment of the present invention. FIG. 2 is a side view of the torpedo of FIG. FIG. 3 is a front view of FIG. FIG. 4 is a cross-sectional view when the torpedo of FIG. 1 is assembled inside the nozzle case of the direct molding machine. FIG. 5 is a diagram showing the time when the molten resin is injected in FIG. 4.

  Hereinafter, the form for implementing this invention is demonstrated using FIGS. First, with reference to FIGS. 1-4, the torpedo 1 which is the injection | emission part of the direct molding machine (not shown) which concerns on the Example of this invention, the nozzle case 2 which can assemble this torpedo 1 inside, and this nozzle The configuration with the mold 3 assembled to the tip of the case 2 will be described individually.

  First, the torpedo 1 will be described with reference to FIGS. The torpedo 1 includes a main body 10 formed in a substantially cylindrical shape, and a needle pin 20 that can advance and retract in the axial direction from the tip of the main body 10.

  As shown in FIGS. 1 and 2, the main body 10 is formed with a hollow insertion portion 12 that communicates with the outside on the tip side (the side on which the molten resin M is injected) along the axial direction. . Thereby, the needle pin 20 mentioned later can be inserted. Further, on the outer peripheral surface of the main body 10, eight blades 14 (first blade 14 a, second blade 14 b, third blade 14 c,. Eighth 14h) is formed.

  Of the eight blades 14, the first blade 14 a, the second blade 14 b, the third blade 14 c, and the fourth blade 14 d are formed only on the distal end side from the substantially middle position in the axial direction of the main body 10. ing. The first blade 14a, the second blade 14b, the third blade 14c, and the fourth blade 14d are formed so as to be uniform in the circumferential direction of the main body 10 (at intervals of 90 °).

  That is, for example, as shown in FIG. 3, the position of the first blade 14a corresponding to 0 o'clock of the hour hand of the watch, the position of the second blade 14b corresponding to 3 o'clock of the hour hand of the watch, and the third blade 14c The fourth blade 14d is formed at a position corresponding to 9 o'clock of the short hand of the watch.

  On the other hand, among the eight blades 14, the fifth blade 14 e, the sixth blade 14 f, the seventh blade 14 g, and the eighth blade 14 h are at the base end side from the substantially middle position in the axial direction of the main body 10 ( It is formed only on the side where the pellet P is fed. Note that the fifth blade 14e, the sixth blade 14f, the seventh blade 14g, and the eighth blade 14h are also the first blade 14a, the second blade 14b, the third blade 14c, and the fourth blade described above. The blades 14d are formed so as to be even in the circumferential direction of the main body 10 (at intervals of 90 degrees).

  The fifth blade 14e, the sixth blade 14f, the seventh blade 14g, and the eighth blade 14h are the first blade 14a, the second blade 14b, the third blade 14c, and the fourth blade, respectively. The blade 14d is formed at a position shifted by 45 degrees in the circumferential direction of the main body 10.

  That is, as described above, the position of the first blade 14a corresponding to 0 o'clock of the hour hand of the watch, the position of the second blade 14b corresponding to 3 o'clock of the hour hand of the watch, and the third blade 14c of 6 If the fourth blade 14d is formed at a position corresponding to 9 o'clock of the hour hand of the watch, the fifth blade 14e is a position corresponding to 1:30 of the hour hand of the watch, the sixth blade 14f Is formed at a position corresponding to 4:30 of the short hand of the watch, a position corresponding to 7:30 of the short hand of the watch is formed at the position of the seventh blade 14g, and a position corresponding to 10:30 of the short hand of the watch. Has been. These descriptions correspond to “to be staggered in the circumferential direction of the main body” described in the claims.

  The eight blades 14 are formed so as to form a slider with respect to the inner peripheral surface of the interior 30 when the main body 10 is assembled to the interior 30 of the nozzle case 2 (in the state shown in FIG. 4). ing.

  In addition, as described above, the eight blades 14 are located at positions corresponding to the hour hand of the watch at 0 o'clock, 3 o'clock, 6 o'clock, 9 o'clock, 1 half hour, 4 half hour, 7 half hour and 10 half hour. The eight blades of the outer peripheral surface of the main body 10 and the inner peripheral surface of the nozzle case 2 are not formed over 360 degrees in the circumferential direction of the main body 10. The space | gap F will arise in the location in which 14 is not formed. This description corresponds to “a blade is formed on the outer surface so that a gap is formed on the inner surface of the nozzle case when assembled inside the nozzle case” described in the claims.

  Further, the base end side of the main body 10 is formed in a tapered shape. Thereby, the pellet P in the inside 30 of the nozzle case 2 to be described later can be smoothly fed into the gap F. This will be described later. The main body 10 is configured in this way.

  On the other hand, the needle pin 20 is formed so as to be inserted into the insertion portion 12 of the main body 10 described above. The proximal end side of the needle pin 20 is inserted into the insertion portion 12 of the main body 10 via the compression spring 22. At this time, the needle pin 20 is inserted into the insertion portion 12 of the main body 10 through a known removal prevention mechanism (not shown). As a result, the needle pin 20 can be prevented from falling off the main body 10.

  In addition, when the needle pin 20 is assembled in the interior 30 of the nozzle case 2 described later, the tip of the needle pin 20 is normally used (when the pellet P is not pushed by a plunger (not shown)). It is formed in a size that closes a gate 42 of a mold 3 (described later) assembled to the case 2 (closes the flow path of the molten resin M). The needle pin 20 is configured in this way.

  Next, the nozzle case 2 will be described with reference to FIG. The nozzle case 2 is a case member formed in a substantially cylindrical shape in order to melt the pellets P pushed into the interior 30 thereof into a molten resin M. Therefore, the inside 30 is opened so that the base end side (lower side in FIG. 4) can push the pellet P through a plunger (not shown), and the other end side (upper side in FIG. 4). Is opened so that the molten resin M can be injected.

  The tip side of the interior 30 is formed such that the inner surface thereof is tapered. Thereby, the molten resin M can be injected at a high pressure. In addition, a ring 32 that prevents the assembled torpedo 1 from falling off is fixed to the interior 30.

  A band heater 34 is attached to the outer peripheral surface of the nozzle case 2. Thereby, the pellet P sent into the inside 30 can be dissolved in the molten resin M. Needless to say, the interior 30 forms a flow path for the pellets P and the molten resin M. The nozzle case 2 is configured in this way.

  Finally, the mold 3 will be described. The mold 3 is a mold in which a cavity 40 capable of molding a resin product (not shown) having a desired shape is formed by the mold 3 and a mating mold 4 that can be clamped relatively to the mold 3. It is a member. The mold 3 is assembled to the tip of the nozzle case 2 described above via a fastening mechanism (not shown).

  In addition, the mold 3 is formed with a gate 42 that communicates the cavity 40 with the tip side inside the nozzle case 2 when the die 3 is assembled to the tip of the nozzle case 2. As described above, the gate 42 is configured to be closed by the needle pin 20 in a normal state. The mold 3 is configured in this way.

  The torpedo 1, the nozzle case 2, and the mold 3 constitute an injection site of the direct molding machine.

  Next, the operation of the injection part of the direct molding machine described above will be described with reference to FIGS. First, from the state shown in FIG. 4, a plunger (not shown) is operated to push the pellet P into the interior 30 of the nozzle case 2 (in FIG. 4, the pellet P enters the interior 30 from the lower side of the nozzle case 2. ).

  Then, since the pushed pellet P is sent into the gap F, the pellet P sent into the gap F is melted by the band heater 34 to become the molten resin M (plasticize). At this time, since the pellet P sent into the gap F comes into contact with the blade 14, the pressure received by the pellet P increases and the plasticization efficiency of the pellet P can be improved.

  Eventually, when the molten resin M becomes high pressure by feeding the pellet P (exceeds a predetermined pressure), the needle pin 20 retreats against the urging force of the compression spring 22. As a result, the gate 42 of the mold 3 is switched from the closed state to the open state, so that the molten resin M is injected into the cavity 40 through the gate 42 (see FIG. 5).

  These descriptions are described in the claims “When the molten resin formed by melting the pellets fed into the gap exceeds a predetermined pressure, the gate communicating with the cavity of the mold assembled to the nozzle case is needled. This corresponds to “the pin is released”. Since the injection amount and the volume of the cavity 40 are substantially the same, the pressure of the molten resin M is also reduced with the completion of the injection. Therefore, the needle pin 20 is returned by the restoring force of the compression spring 22, and the gate 42 is also returned to the closed state (the state shown in FIG. 4).

  Note that the direct molding machine described above forms a cavity 40 by combining a mold with a part of a pre-molded resin product (primary molded products 5 and 6), and another molded product (melted later described). This is an injection molding machine of a type that directly molds a secondary molded product molded by injection of resin M (see FIG. 4). According to such a direct molding machine, first, there is an advantage that a target shape can be formed in a free part of the primary molded products 5 and 6 without changing the molds of the primary molded products 5 and 6. is there. Conventionally, instead of a joint part for joining a two-part molded product, a member that is joined between two parts (primary molded products 5 and 6 and a secondary molded product) is formed by direct molding. There is no part management cost and the two parts can be combined at low cost.

  The torpedo 1 according to the embodiment of the present invention is configured as described above. According to this configuration, the fifth blade 14e, the sixth blade 14f, the seventh blade 14g, and the eighth blade 14h are the first blade 14a, the second blade 14b, the third blade 14c, It is formed at a position shifted by 45 degrees in the circumferential direction of the main body 10 with respect to the four blades 14d. Therefore, the pellet P fed into the gap F comes into contact with many blades 14 (in this example, eight blades 14a, 14b, 14c,..., 14h), and this contact area can be increased. it can. Therefore, the pressure received by the pellet P is further increased, and the efficiency of plasticizing the pellet P can be further improved. Moreover, since the shape of the blade 14 is also a simple linear shape, unlike the prior art, the processing can be simplified.

The contents described above are only related to one embodiment of the present invention, and do not mean that the present invention is limited to the above contents.
In the embodiment, four blades (a first blade 14a, a second blade 14b, a third blade 14c, and a fourth blade 14d) are formed on the tip side from the substantially middle position in the axial direction of the main body 10, An example in which four blades (fifth blade 14e, sixth blade 14f, seventh blade 14g, and eighth blade 14h) are formed on the base end side from the substantially middle position in the axial direction of the main body 10. explained. That is, an example in which a total of eight blades 14 are formed, four on each of the distal end side and the proximal end side of the main body 10 has been described. However, the present invention is not limited to this, and the number of blades 14 may be any number.

  In the embodiment, the first blade 14 a, the second blade 14 b, the third blade 14 c, and the fourth blade 14 d are formed only on the distal end side from the substantially middle position in the axial direction of the main body 10. Explained. However, the present invention is not limited to this, and the first blade 14a, the second blade 14b, the third blade 14c, and the fourth blade 14d are all in the axial direction of the main body 10 (from the substantially middle position to the tip side). It may be formed not only near the middle position but also on the base end side).

  In the embodiment, an example in which the eight blades 14 have a substantially rectangular front shape has been described (see FIG. 3). However, the present invention is not limited to this, and the eight blades 14 may have a substantially oval or substantially square front shape.

1 Torpedo 2 Nozzle case 3 Mold 10 Main body 14 Blade 20 Needle pin 30 Internal 40 Cavity 42 Gate F Cavity M Molten resin

Claims (1)

When assembled inside the nozzle case, a substantially cylindrical main body having a blade formed on the outer surface so that a gap is formed on the inner inner surface of the nozzle case, and a needle pin capable of moving back and forth in the axial direction from the tip of the main body. ,
When the molten resin formed by melting the pellets sent into the gap exceeds a predetermined pressure, the needle pin opens the gate communicating with the cavity of the mold assembled to the nozzle case,
A plurality of blades are formed so as to be uniform in the circumferential direction of the main body along the axial direction of the main body, and to be staggered in the circumferential direction of the main body with respect to the middle position in the axial direction ,
In the main body, a hollow insertion part whose tip side communicates with the outside is formed along the axial direction,
The needle pin is inserted into the insertion part of the main body through a removal prevention mechanism,
The slip-off prevention mechanism is configured by the protruding portion formed on the outer peripheral surface of the needle pin interfering with the inner edge on the distal end side of the insertion portion when the needle pin advances from the tip of the main body. torpedo, characterized by that.

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