JP2691661B2 - Purge shield device for injection molding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purge shield for an injection molding machine.

[0002]

2. Description of the Related Art A purge shield in an injection molding machine has a structure surrounding a nozzle at the tip of a cylinder assembly in an injection unit because it is necessary to prevent resin from scattering during purging. On the other hand, it is possible to open the side plate and inspect the nozzle touch condition and nozzle, but it is very dangerous if purging is done at such a time,
A detector for opening and closing the side plate is provided to disable the purging operation when the side plate is open.

However, in the conventional purge shield, even if the side plate can be opened and closed, the entire periphery of the tip end portion of the cylinder assembly is not opened, and in the end, it is cramped in a narrow area regulated by the purge shield. I have to work. In addition, the purge shield may be removed from the front plate at the time of work in order to open the periphery of the tip of the cylinder assembly, but in each case, it is necessary to use a tool, and the purge shield must be removed to remove the nozzle from the nozzle. Even though the part is exposed,
The detector for opening / closing the side plate may not operate and may be extremely dangerous.

That is, in the conventional purge shield, the detector for opening / closing the side plate is constructed as a member on the side of the purge shield. Therefore, even if the entire side of the purge shield is moved with the side plate closed, the above-mentioned detection is performed. Does not work. Furthermore, if the detector for opening and closing the side plate is configured as a member on the side of the purge shield, the lead wire connected to the detector is also rotated when the purge shield is removed as necessary, which results in Get in the way.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a purge shield device which is capable of completely opening the tip end portion of the cylinder assembly as well as the purge shield function and which is safe with respect to purging.

[0006]

A purge shield device comprises a purge shield and an open / close detector. The open / close detector detects the open / close of the shield space and is fixed to the front plate. The purge shield includes a top plate and left and right side plates and is detachably attached to the front plate without using a tool. At least one of the side plates of the purge shield can be opened and closed.

[0007]

[Operation] The open / close detector fixed to the front plate
The open / close of the shield space is detected, and even if the purge shield is removed from the front plate, it is detected that the purge shield is “open”. The structure in which the purge shield is detachable facilitates work on the tip end of the cylinder assembly. The configuration in which at least one of the side plates of the purge shield can be opened and closed facilitates normal inspection and adjustment such as the state of nozzle touch.

[0008]

EXAMPLE In FIG. 3, reference numeral 1 represents an injection molding machine,
The mold clamping unit 3 and the injection unit 4 are arranged on the base 2 so as to face each other. A purge shield 6 is attached to the front plate 5 of the mold clamping unit 3 on the surface on the injection unit 4 side. In FIG. 3, the injection unit 4 is in a state where the nozzle touch is released due to purging, and the nozzle 8 at the tip of the cylinder assembly 7 is removed.
Is spaced from a mold sprue bushing (not visible in the figure) attached to the front plate 5. However, the nozzle 8 is in the shield space surrounded by the purge shield 6.

The purge shield 6 (FIG. 1) is provided with a transparent top plate 9 and left and right side plates 10 and 11 each made of an acrylic resin, and these are assembled together with a front mounting plate 12. That is, the mounting plate 12 (FIG. 2) has a gate shape with an open bottom, the front edge of the top plate 9 is fixed to the upper edge, and the front edges of the left and right side plates 10 and 11 are hinged to both side edges, respectively. It is rotatably attached. Thereby, the both side plates 10 and 11 can open and close the shield space 14 formed by the purge shield 6. Reference numeral 15 is a stopper, which is rotatably attached to the upper portions of the respective side plates 10 and 11, and is rotated upward to engage the hanging portion of the top plate 9 to bring the side plates 10 and 11 to the closed position. Can be maintained. Engagement recesses 16 are formed on the upper side of the gate-shaped mounting plate 12 at intervals at the lower edge in the left-right direction.

On the other hand, on the surface of the front plate 5 on the injection unit 4 side, two hooks 17 are fixed at the positions where the purge shield 6 is attached. The hook 17 has a hook shape and is attached so that the upper part thereof is opened. Further, the hook 17 is attached to the injection unit 4 side on the upper side thereof, respectively.
8 is fixed, and the contact pins 19 are arranged with the left and right sides facing outward. Lead wire 20 of the microswitch 18
Is fixed to the surface of the front plate 5. The micro switch 18 is an opening / closing detector that detects opening / closing of the shield space formed by the purge shield 6.

The purge shield 6 can be easily mounted by simply engaging the engaging recesses 16 of the mounting plate 12 with the hooks 17 fixed to the surface of the front plate 5 (FIG. 1). Also, when removing, it is easy by simply lifting the entire purge shield 6 slightly upward. Then, when the purge shield 6 is attached to the front plate 5, the micro switches 18, 18 are located in the shield space by the purge shield 6, and the contact pins 19, 19 thereof are in the closed state.
It contacts with and emits an ON signal. The ON signal is transmitted to the numerical control device (NC device) included in the injection molding machine through the lead wire 20, which is one condition for the NC device to issue a purging command.

When the purge shield 6 is attached to the front plate 5 and both side plates 10 and 11 are closed and both microswitches 18 are turned on, the nozzle 8 is purged at the position shown in FIG. Even if the resin from the nozzle 8 is scattered with gas,
It is not suppressed by the purge shield 6 and does not widely scatter around, and there is no danger to the operator. When one of the both side plates 10 and 11 is rotated to open the shield space by inspecting the mounting state of the nozzle 8 or the like, the micro switch 18 is turned off and the purging command is not issued.
Further, when it is necessary to completely open the tip end of the cylinder assembly 7 for work, the purge shield 6 is removed from the front plate 5 without a tool, but the shield space is also opened at this time and the micro switch 18 is turned off. Therefore, the purging command is not issued and the work can be safely performed.

The above is one embodiment. To attach the purge shield 6 to the front plate 5, permanent magnets are attached to the front plate 5 side and the purge shield 6 side, respectively, and a structure in which they are attached by magnetic force or pins formed to project to the purge shield 6 side are formed on the front plate 5. It is also possible to have a structure in which it is inserted into the pin hole and attached.

The arrangement of the open / close detector and other configurations of the present invention are not limited to the illustrated specific configuration.

[0015]

The purge shield prevents the risk of purging. Easy to attach and remove the purge shield,
Easy to work on the tip of the cylinder assembly. The open / close detector operates even when the side plate is opened / closed and when the purge shield itself is removed, and it is detected that the shield space is open, and the purging operation of the injection molding machine is disabled. Is high.

[Brief description of the drawings]

FIG. 1 is a perspective view (partially see through) with a purge shield attached.

FIG. 2 is an exploded perspective view (partially cut away).

FIG. 3 is a front view of an injection molding machine.

[Explanation of symbols]

3 Clamping unit 4 Injection unit 5 Front plate 6 Purge shield 9 Top plate 10 Left side plate 11 Right side plate 14 Shield space 18 Micro switch

Claims (1)

(57) [Claims] 1. A mold clamping unit, comprising a purge shield attached to a side of an injection unit of a front plate and an opening / closing detector, the opening / closing detector is for detecting opening / closing of a shield space and is fixed to the front plate, The purge shield has a top plate and left and right side plates, is detachably attached to the front plate without using a tool, and at least one of the side plates is configured to be openable and closable with respect to the shield space. Purge shield device for injection molding machines.