FR2819445A1 - Automatic coupler/uncoupler for ejection shanks of tools used in transformation by injection/compression of plastics, liquid silicones and elastomers - Google Patents

Abstract

The coupler/uncoupler consists of a mechanical coupling (1) connected to a fixed support (3) by a thread and a spacer (8) which allows the assembly to be fastened to an injection/compression machine. The coupler/uncoupler consists of a mechanical coupling (1) connected to a fixed support (3) by a thread and a spacer (8) which allows the assembly to be fastened to an injection/compression machine. The fixed support is also equipped with two pneumatic cylinders (4a, 4b) for disconnecting and releasing an injection nozzle (5) when changing the fabrication or dismantling the tool. The release of the nozzle is made possible by the mobility of a second metal support, which compresses the collar (10) of the mechanical coupling when compressed air is fed to the pneumatic cylinders through pipes (7a, 7b) via a rotary distributor, retracting their rods (9a, 9b) to pull on the support and free the nozzle. A small model of the assembly would measure 110 mm wide by 60 mm high and 70 mm thick, while a large one would measure 150 x 100 x 110 mm, applying traction efforts of 24 and 32 KN respectively.

Description

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The present invention relates to the technical and practical improvement of a mechanical device for coupling and uncoupling the ejection system of the tools used for the transformation by injection of thermoplastics, thermosets, liquid silicones, and elastomers.

The coupling is traditionally carried out either by a fully mechanical device, which requires the intervention of a person and a loss of time, or by a completely hydraulic device which does not require human intervention, nor loss of time. but requires having a hydraulic circuit connected to the machines for operation and remains very expensive to purchase, or a completely pneumatic system which itself does not require human intervention but it remains however as expensive as the hydraulic system because they are both fully automated from origin.

The device according to the invention makes it possible to overcome these different constraints (costs and intervention times).

It has indeed a mechanical coupling and a pneumatic uncoupling which allows it to be much cheaper while remaining as effective and independent of the intervention of a person.

This device includes a fully mechanical part (coupling) to which is added, thanks to two metal supports, two small pneumatic cylinders for uncoupling.

 The coupling of this mechanical part with the tool attachment system (ejection tail) is done by pressure, it suffices to press on the end piece and exert pressure to couple the two parts (coupling and tool ejection nozzle), by account to uncouple them, air must be sent to operate the two jacks so as to bring in the rods of these jacks, they then release the ejection nozzle of tools.

The attached photos illustrate the invention:
Figure 1 shows the device of the invention in coupled mode.

 FIG. 2 represents the device of the invention in uncoupled mode.

 With reference to these figures, the device comprises a mechanical coupling (l) on which two metal supports are added, a mobile support (2) connected to the jacks (4a and 4b) by means of two nuts (6a and 6b) located at the end of the rod (9a and 9b) and a fixed support (3) which is connected to it by means of a clamping between the threaded end of the hitch and a spacer (8), support (3) itself comprises two cylinders (4a and 4b), themselves held by four nuts (11).

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Pour désaccoupler l'attelage de l'embout d'éjection (5) il faut envoyer de l'air comprimé par les tuyaux (7a et 7b) à l'aide d'un distributeur rotatif (non représenté) afin de faire fonctionner les vérins (4a et 4b).

To disconnect the coupling from the ejection nozzle (5), compressed air must be sent through the pipes (7a and 7b) using a rotary distributor (not shown) in order to operate the jacks (4a and 4b).

The fact of sending air into the chamber of the jacks this allows the rods (9a and 9b) to enter and pull at the same time the mobile support (2), this mobile support (2) by moving this support on the flange (10) of the coupling and allows the end piece (5) to disengage and release the ejection of the tool.

According to a variant not illustrated, a proximity sensor can be added so as to be able to give information (coupled, uncoupled) to the machine.

By way of nonlimiting example, the coupling will have dimensions of the order for small models of 110 mm for the width, 60 mm for the height and 70 mm for the thickness and for the large models 150 mm for the width, 100 mm for height and 110 mm for thickness.

Small models will have a pulling force of 24 KN, and large models will have a force of 32 KN.

The device according to the invention is particularly intended for couplings for tools which are mounted on injection molding machines for plastics, silicones and elastomers.

Claims (2)

1) Device for automatically coupling and uncoupling (without the intervention of a person) the ejection tails of the tools used for the transformation by injection or compression of thermoplastics, thermosets, liquid silicones and elastomers, characterized in that it comprises a mechanical coupling (1) to which is added a stationary support (3) which is fixed on this same mechanical coupling (1) by means of a thread and a spacer (8), this spacer makes it possible to fix this device on the injection or compression machine, on this same support (3) are fixed two pneumatic cylinders (4a and 4b) which will be used to uncouple and release

 the ejection nozzle (5) during a change of manufacture or disassembly of the tool.  2) Device according to claim 1 characterized in that the release of the tip (5) is possible thanks to the mobility of a second metal support (2) which will compress the flange (10) of the hitch (1 ) when the compressed air is sent into the pipes (7a and 7b) via a rotary distributor (not shown) to supply two jacks (4a and 4b) so as to actuate and bring in the two rods (9a and 9b) and thereby pulling the support (2) which will release the end piece (5).