JPH0531923U - Purge resin cutting device for injection molding machine - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a purge resin cutting device for an injection molding machine, and in particular, eliminates adhesion of the purge resin to the nozzle at the time of purging, and quickly cuts the purge resin from the nozzle after completion of purging. However, it is characterized by enabling automatic driving. A purge resin cutting device for an injection molding machine according to the present invention is a purging resin cutting device for an injection molding machine (20, 20) for cutting a purge resin (8) injected from a nozzle (2) of an injection molding machine (1). 20A), a cutter plate (2) that moves in a direction perpendicular to the axis (21) of the nozzle (2).
2), a cutter mounting plate (24) that moves together with the cutter plate (22) and has the cutter plate (22) operably via a spring (23), and the nozzle provided on the cutter plate (22). A nozzle receiving recess (25) joined to (2) and a cutter hole (26) communicating with the nozzle receiving recess (25) are provided, and the purge resin (8) is cut by the movement of the cutter plate (22). This is the configuration.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a purge resin cutting device for an injection molding machine, and in particular, eliminates the adherence of the purge resin to the nozzle during purging, and promptly cuts the purge resin from the nozzle after completion of purging, enabling automatic operation. For new improvements for.

[0002]

[Prior Art]

 There are various conventional injection molding machines, but as an example, the configuration shown in FIG. 9 is generally adopted. That is, the injection molding machine 1 includes an injection device 3 having a nozzle 2 at its tip, a fixed platen 4, a movable platen (not shown), a mold (not shown) fixed to each plate, and an injection device. 3, a receiving portion 5 formed on a fixed plate 4 for allowing insertion of the nozzle 3, a chute 6 for receiving the purge resin discharged from the tip of the nozzle 2, and a container for accommodating the purge resin received by the chute 6. 7 and 7. Therefore, in the case of changing the color of the resin material after the injection molding, the purge resin 8 discharged from the nozzle 2 is received by the chute 6 and conveyed to the outside of the injection molding machine 1 and stored in the container 7.

[0003]

[Problems to be solved by the device]

 The conventional purge resin cutting device for an injection molding machine has the following problems because it is configured as described above. That is, the purge resin 8 discharged onto the chute 6 gradually cools after completion of the discharge, and extends while pulling the thread from the injection hole 9 of the nozzle 2 without being completely cut, and becomes a thin rod shape to harden and shoot. Retain on 6. If the next purge is performed by changing the color in this state, the next purge resin will flow through this cold and hardened rod-shaped resin, and this purge resin will not be discharged properly and will accumulate on the chute 6. However, at this time, the stagnant resin was removed manually. Further, as shown in FIG. 10, the purge resin 8 gradually sticks and adheres around the tip of the nozzle 2, and when purging is further performed in this state, the next purge resin 8 also adheres and gradually grows. Go on. If injection molding is attempted in this state, when the nozzle 2 comes into contact with the mold, the adhered purge resin 8 is sandwiched between the tip of the nozzle 2 and the mold to weaken the sealing force during injection molding. Becomes If the purge resin is repeatedly attached around the nozzle 2, as shown in FIG. 11, the purge resin attaches and extends to the nozzle heater portion 11, which may eventually damage the nozzle heater portion 11. It was Therefore, if the purge resin after discharge is not completely cut off from the nozzle 2 and continues to adhere to the tip of the nozzle 2, it becomes necessary to manually remove the purge resin, and at night when manpower is insufficient. In particular, there is a problem in that the injection molding machine 1 may not be automatically operated.

The present invention has been made in order to solve the above problems, and in particular, the purge resin is not attached to the nozzle during purging, and the purge resin is quickly removed from the nozzle when purging is completed. It is an object of the present invention to provide a purge resin cutting device for an injection molding machine, which is cut to enable automatic operation.

[0005]

[Means for Solving the Problems]

 The purge resin cutting device for an injection molding machine according to the present invention is a purge resin cutting device for an injection molding machine that cuts the purge resin ejected from the nozzle of the injection molding machine, and moves in a direction perpendicular to the axis of the nozzle. A cutter plate, a cutter mounting plate that moves together with the cutter plate and is operably operable via a spring, a nozzle receiving recess provided on the cutter plate and joined to the nozzle, and a nozzle receiving recess. And a cutter hole communicating with each other, and the purge resin is cut by the movement of the cutter plate.

More specifically, the cutter hole mounting plate has a purge protection plate for guiding the purge resin.

More specifically, the cutter plate is configured to move linearly.

More specifically, the cutter plate is configured to rotate and move.

[0009]

[Action]

 In the purging resin cutting device for the injection molding machine according to the present invention, the cutter plate that moves in the direction perpendicular to the axial direction of the nozzle is mounted on the cutter mounting plate via the spring, and when the purging is performed, the cutter mounting plate is mounted. The plate is moved and joined by pressing the nozzle receiving recess against the tip of the nozzle by the operation of the spring, the purge resin is discharged from the cutter hole formed in this nozzle receiving recess, and after the discharging work is completed, By moving the cutter mounting plate in the direction away from the nozzle and pressing the nozzle receiving recess against the tip of the nozzle by using a spring, the cutter mounting plate can be moved away, and the purge resin can be cut by moving the edge of the cutter hole. ..

[0010]

【Example】

 A preferred embodiment of the purge resin cutting device for an injection molding machine according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent portions as those of the conventional example will be described using the same reference numerals.

First, as shown in FIGS. 1 to 6, a purging resin cutting device 20 for an injection molding machine according to the present invention includes a cutter plate 22 that moves in a direction perpendicular to an axis 21 of a nozzle 2 of the injection molding machine 1. A cutter mounting plate 24 which moves together with the cutter plate 22 so as to be operatively operated via a spring 23; a nozzle receiving concave portion 25 provided on the cutter plate 22 and joined to the nozzle 2; and the nozzle receiving concave portion. It mainly comprises a cutter hole 26 communicating with 25 and a purge protection plate 27 integrally provided on the cutter mounting plate 24 for guiding the purge resin 8 discharged from the nozzle 2.

The nozzle receiving recess 25 is formed in a hemispherical shape at the center of the surface of the cutter plate 22 that faces the nozzle 2. The nozzle receiving recess 25 has the cutter hole at the center thereof. 26 is formed so as to penetrate the cutter plate 22, and the cutter hole 26 has a diameter slightly larger than the diameter of the injection hole 9 of the nozzle 2, so that the purge resin 8 can be discharged from the injection hole 9. It is arranged to guide you.

The cutter mounting plate 24 is disposed behind the cutter plate 22, and the four guide rods 28 provided on the cutter mounting plate 24 are inserted into and penetrate the guide holes 22 a of the cutter plate 22. The cutter plate 22 is held by the stoppers 29 provided at the outer ends of the guide rods 28 so as not to come off from the guide rods 28. Further, the spring 23 is provided on the outer circumference of each guide rod 28 between the cutter mounting plate 24 and the cutter plate 22, and the cutter plate 22 is movable in the same direction as the axis 21 of the nozzle 2. Being energized.

As shown in FIGS. 5 and 6, one end of the cutter attachment plate 24 is further connected to a rotary shaft 30 a of a rotary actuator 30 provided on one surface of the fixed platen 4 via a support base 31. The cutter mounting plate 24 is provided so as to be swingable in the arrow A direction with the rotary shaft 30a as a fulcrum. Therefore, as shown in FIG. 5, the cutter mounting plate 24 swings in the direction perpendicular to the axis 21 of the nozzle 2 as the rotary shaft 30a of the rotary reactor 30 rotates, and at the same time, as shown in FIG. , 4, the tip of the nozzle 2 and the nozzle receiving recess 25 of the cutter plate 22 can be repeatedly joined / separated.

Next, as shown in FIG. 3, the purge protection plate 27 is disposed behind the cutout portion 24a of the cutter mounting plate 24, has a V-shaped cross section, and has a chute 6 (below). (Shown in FIG. 6). Therefore, the purge protection plate 27 is configured so that the direction of the purge resin discharged in the direction of the axis 21 can be changed by 90 ° and it can be guided to the chute 6.

Hereinafter, the operation of the purge resin cutting device 20 according to the present invention will be described based on the above-described configuration. First, before purging, the rotary actuator 30 is operated, and as shown in FIG. 5, the cutter mounting plate 24 is rotated downward with the rotary shaft 30a as a fulcrum, and as shown in FIG. The tip of the nozzle 2 and the nozzle receiving recess 25 of the cutter plate 22 are joined together. At the time of this joining, the lower end edge of the cutter plate 22 once comes into contact with the front end of the nozzle 2, but the action of the spring 23 pushes the cutter plate 22 toward the cutter mounting plate 24 side. Then, the tip of the nozzle 2 moves while contacting the surface of the cutter plate 22, and finally the nozzle 2 is housed and fitted in the nozzle receiving recess 25. When purging is performed in this state, the purge resin 8 discharged from the injection hole 9 hits the purge protection plate 27 through the cutter hole 26, is redirected, and flows to the chute 6 below. Then, the purge resin is stored in the container 7.

After the above-mentioned purging is completed, the rotary actuator 30 is operated to rotate the cutter mounting plate 24 upward as shown in FIG. 5, and as shown in FIG. 4, the tip of the nozzle 2 and the nozzle receiving concave portion. 25 and away from each other. At the time of this separation, the purge resin 8 discharged from the ejection hole 9 of the nozzle 2 and extending is cut by the edge of the cutter hole 26. The cut purge resin 8 slides down on the chute 6 and is accommodated in the container 7 without pulling a thread from the tip of the nozzle 2.

The present invention is not limited to the above-described embodiment, and for example, by performing Teflon processing on the entire purge resin cutting device, it is possible to favorably prevent the adhesion of scattered purge resin. It can also be done.

Further, as another embodiment, as shown in FIGS. 7 and 8, another purge resin cutting device 20 A includes a cutter plate 22 which is vertical to the axis 21 of the nozzle 2 and moves vertically. I have it. The cutter mounting plate 24, on which the cutter plate 22 is arranged, is fixed to the tips of the rods 41a and 41b of the double rod cylinder 41 as a drive device, and is adapted to move up and down following the expansion and contraction of the rod. .. The double rod cylinder 41 is fixed to the wall surface of the stationary platen 4, communicates with an external pressure source (not shown), and operates the rods 41a and 41b by the supply of hydraulic pressure from this pressure source. Therefore, when purging is performed, the cutter plate 22 is moved downward by the operation of the double rod cylinder 41, and the nozzle receiving recess 25 and the tip of the nozzle 2 are pressed against each other under the action of the spring 23. The cutter plate 22 is moved upward to separate the nozzle receiving recess 25 from the tip of the nozzle 2, and at that time, the purge resin 8 extending from the injection hole 9 of the nozzle 2 is cut by the edge of the cutter hole 26.

[0020]

[Effect of the device]

 Since the purge resin cutting device for an injection molding machine according to the present invention is configured as described above, the following effects can be obtained.

That is, when purging, the nozzle receiving recess and the tip of the nozzle are pressure-bonded to each other under the bias of the spring, so that the purge resin does not adhere to the tip of the nozzle, Keeps a clean state (self-cleaning action) at all times, so the purge resin does not get caught between the tip of the nozzle and the mold during injection molding, so the sealing force during injection molding is always kept constant. Will be done. Further, it is possible to prevent the nozzle heater part from being damaged due to repeated adhesion of the purge resin.

Further, since the purge resin hardened in the form of a fine thread from the injection hole of the nozzle can be appropriately cut by the cutter hole of the cutter plate, a part of the injection hole is not blocked by the purge resin and The purging resin does not stay on the chute when the purging is performed.

Further, it is most effective in automating the injection molding machine, and has an excellent effect that the purging work can be continuously performed without manual labor.

[Brief description of drawings]

FIG. 1 is an enlarged front view of essential parts showing a purge resin cutting device for an injection molding machine according to the present invention.

FIG. 2 is an enlarged plan view of an essential part showing a purging resin cutting device for an injection molding machine of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG.

FIG. 4 is a cross-sectional view showing the separation between the tip of the nozzle and the cutter plate.

FIG. 5 is a front view showing a state where the purge resin cutting device of the present invention is attached to a fixed platen.

FIG. 6 is a plan view of FIG.

FIG. 7 is a front view showing another embodiment of the purge resin cutting device of the present invention.

FIG. 8 is a side view of FIG.

FIG. 9 is a perspective view showing a conventional injection molding machine.

FIG. 10 is a partially enlarged front view showing a state in which purge resin is attached to the tip of the nozzle.

11 is a partially enlarged front view showing a state in which purge resin is further attached from the state of FIG.

[Explanation of symbols]

 1 Injection molding machine 2 Nozzle 20, 20A Purge resin cutting device 21 Axis 22 Cutter plate 23 Spring 24 Cutter mounting plate 25 Nozzle receiving recess 26 Cutter hole 27 Purge protection plate

Claims (4)

[Scope of utility model registration request] 1. An injection molding machine purge resin cutting device (20, 20A) for cutting a purge resin (8) injected from a nozzle (2) of an injection molding machine (1), the axis of the nozzle (2). A cutter plate (22) that moves in a direction perpendicular to the (21), and a cutter mounting plate (24) that moves together with the cutter plate (22) and is operable via the spring (23). ), A nozzle receiving recess (25) provided on the cutter plate (22) and joined to the nozzle (2), and a cutter hole (26) communicating with the nozzle receiving recess (25). A purge resin cutting device for an injection molding machine, characterized in that the purge resin (8) is cut by the movement of (22). 2. The cutter hole mounting plate (24) includes:
The purge resin cutting device according to claim 1, further comprising a purge protection plate (27) for guiding the purge resin (8). 3. The purge resin cutting device for an injection molding machine according to claim 1, wherein the cutter plate (22) is configured to move linearly. 4. The purge resin cutting device for an injection molding machine according to claim 1, wherein the cutter plate (22) is configured to rotate.