JPH0638657Y2 - Injection molding machine mold installation inspection mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a mold attachment inspection mechanism for inspecting whether or not a mold is completely attached to a movable platen and a fixed platen of an injection molding machine.

(Prior Art) Usually, the mold is fixed by arranging the mold at a predetermined position on a movable platen and a fixed platen and tightening it with a mounting bolt or the like. However, in some cases, the user may inadvertently forget to tighten the mounting bolt, and even if tightened, if the tightening force is insufficient or not uniform, the mounting bolt may become loose during long-term operation of the molding machine. There was something that happened. In such a case, the mold may slip during operation and come into contact with various parts of the molding machine, or in the worst case, the mold may fall off and damage the mold and molding machine, which is extremely dangerous in terms of work. is there.

Further, in recent years, a mechanism for automatically attaching and detaching the mold by a mechanical device such as a clamp has been developed in order to improve productivity, and whether or not the mold is securely attached during such automatic attachment and detachment. Confirmation becomes extremely important.

(Problems to be solved by the device) In view of the above situation, the device of the present invention is to prevent the mold from falling off and to prevent it from being damaged and to ensure work safety.
It is an object of the present invention to provide a die attachment inspection mechanism for an injection molding machine, which can easily and easily inspect whether or not the die is securely attached to the attachment surfaces of the movable platen and the fixed platen. is there.

(Means for Solving the Problem) That is, this invention forms an air blowout portion communicating with an air source on the die mounting surfaces of the movable platen and the fixed platen, and press-bonds the air blowout portion to the backside of the mold. An O-ring is inserted, and air is sent to the air blowout portion to detect the air pressure between the attached die back surface and the attached die back surface, and the attachment surface is inspected. Related to the inspection mechanism.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view showing an example in which a die is attached to a mounting surface of a fixed plate by a clamp device, and FIG. 2 is a sectional view of an essential part of an injection molding machine showing an example of a die attachment inspection mechanism of the present invention. FIG. 3 is an enlarged sectional view of a portion indicated by an arrow mark 3 in FIG.

In the illustrated example, the die is automatically attached and detached by a clamp type attaching and detaching device. The illustrated attaching / detaching device 30 is configured such that the mold 20 is hung from above in a space that is slightly larger than the mold mounting distance between the mounting surface 11A of the fixed plate 11 and the mounting surface 12A of the movable plate 12 and the movable plate 12 and the movable plate 12 are movable. The mold 20 is aligned with the positioning projections (stoppers) 19 and 19 provided on the lower portions of the respective mounting surfaces of the board 12. After the positioning, the mold is clamped, and the switching valve 32 of the hydraulic unit 31 of the desorption device 30 is operated to project the claws 34, 34 of the clamps 33, 33 arranged on the left and right of each mounting surface, and the flange of the mold. The parts 21 and 22 are compressed to fix the mold 20.

In FIG. 2, reference numeral 23 is a fixed split mold, 24 is a movable split mold, 25 is a cavity, 26 is a sprue hole, and 29 is an injection nozzle.

The mold attachment inspection mechanism of this invention is shown in FIG. 2 and FIG. 3 which is a partially enlarged view thereof.

That is, each die mounting surface 11A of the fixed plate 11 and the movable plate 12
And 12A, the air outlet 40 communicating with the air source 50
Is provided. In the illustrated embodiment, a recess 41 is formed on the mounting surface, and an air outlet 42 is provided in the recess 41. An O-ring 45 as shown in the figure is fitted in the recess 41 to enhance the airtightness between the back surface of the mold 20 and the mounting surface.

Air blower 40 provided on the fixed board 11 and the movable board 12
2 is an air flow path 46 and an air conduit in the board as shown in FIG.
Via 47, it is connected to an air source 50 via a switching solenoid valve 48 and a stop valve 49. At the same time, a pressure switch 55 for detecting the air pressure between the back surfaces of the molds is provided in the air circuit and is configured to emit a predetermined signal 56.

(Operation) Next, an operation example of this device will be explained. After the mold is mechanically or manually attached to the fixed platen 11 and the movable platen 12, the switching valve
48 is turned on, and the air is supplied from the air source 50 to the air blowing portions 40 of the fixed platen 11 and the movable platen 12 under pressure. The pumped air is normally sealed with the back surface of the attached mold when the mold 20 is completely attached, and thus maintains a constant high air pressure value.

On the other hand, as shown in FIG. 3, when the mold 20 is not completely attached, a gap C is created between the air blowing portion 40 and the rear surface of the mold 20. The air pressure leaks to the outside through the gap and the air pressure decreases. Then, due to the decrease in the air pressure, the pressure switch 55 provided in the air circuit is activated to generate the check signal 56. This signal 56 gives an audible and optical alarm and also deactivates the molding machine if necessary.

In addition, it is preferable that the air is pressure-fed for the entire time when the mold is attached and the molding machine operates. This is because it is not always the case that the mounting state of the mold does not change during operation due to some circumstances as described above. In particular, in the hydraulic clamp device of the automatic attachment / detachment system as shown in the embodiment, the unexpected problem of the hydraulic device etc. was taken into consideration, and the mounting of the mold changed due to the so-called fail-safe concept. In this case, the operation of the molding machine is immediately stopped by the signal of the pressure switch. Changeover switch when mold is not attached
Turn off 48 to stop air pumping.

(Effect) As described above with reference to the drawings, according to the mold attachment inspection mechanism of the present invention, it is possible to easily and reliably inspect the attachment of the mold by the pressure of the air sent to the air blowing portion. became. Further, according to the device of the present invention, it is possible to perform the inspection with an extremely simple mechanism, which is advantageous in terms of the device, and moreover, it is possible to easily check the entire molding time as described above.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example in which a die is attached to a mounting surface of a fixed plate by a clamp device, and FIG. 2 is a sectional view of an essential part of an injection molding machine showing an example of a die attachment inspection mechanism of the present invention. FIG. 3 is an enlarged sectional view of a portion indicated by an arrow mark 3 in FIG. 11 ... Fixed plate, 12 ... Movable plate, 11A, 12A ... Mold mounting surface, 20 ...
Mold, 40 ... Air blowout portion, 41 ... Recessed portion, 42 ... Air blowout hole, 45
... O-ring, 48 ... Changeover switch, 50 ... Air source, 55 ... Pressure switch, 56 ... Signal.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Maeda 2 Daikon, Kitazaki-cho, Obu-shi, Aichi Prefecture Meiki Co., Ltd. (72) Nobuhiro Kawai 2 Daikon, Kitazaki-cho, Obu-shi, Aichi Meki Co., Ltd. (72) Inventor Kaoru Yamanishi 2 Daikon, Kitazaki-cho, Obu-shi, Aichi Prefecture Meiki Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. An air blow-out portion communicating with an air source is formed on a die mounting surface of a movable platen and a fixed platen, and an O-ring which is crimped to the back side of the die is inserted into the air blow-out portion, and the air is blown out. A mold mounting inspection mechanism, wherein the mounting surface is inspected by detecting the air pressure between the rear surface of the mounted mold by sending air to the blowout part.