FR2479070A3 - Vibration assisted moulding tool with floating mould collar - to isolate machine frame from vibration - Google Patents

Abstract

Machine for moulding with vibration assistance materials having a high degree of plasticity is fitted with a floating collar to enclose the sides of a block of matl. being compressed between a vibrating plunger and a dynamic platen. Suitable for moulding blocks of plain or reinforced concrete. Eliminates transmission of the vibration via the mould walls to the machine structure where damage may otherwise result. The floating collar rides on a platen which is thinner and can be raised or lowered to pick up projecting lips on the floating collar and shift the collar relative to the dynamic platen surface.

Description

 The present invention relates to the manufacture of products from plastic materials, such as, for example, concrete and reinforced concrete products, and in particular relates to a device for molding plastic material products.

We know a vibrating press comprising a chassis on which are mounted a die, a vibrating punch and a vibrating table, the latter resting on shock absorbers (USSR inventor certificate
No. 204215 class B2831 / 04, published September 16, 1955).

We also know a molding device consisting of a die, a punch and a vibrating crosspiece (USSR inventor certificate
No. 458448, in class B28131 / 08).

 However, these known devices do not make it possible to obtain quality products having the prescribed structure, because the vibrating system is unstable and the transmission of the vibration forces takes place via a kinematic chain with several elements.

 In addition, a molding device is known, chosen by the authors of the present invention as a prototype (United States patent No. 3,604,076 in class 2542, published in 1971).

 This device includes a vibrating punch, a vibran-te table with shock absorbers and a matrix with an actuator for its vertical displacement along slides. The matrix is placed freely on a molding pallet placed on the vibrating table. After loading the material into the die, the vibrating punch descends and the product is compression molded with vibration.

 Once the molding has been completed, the product on the pallet is dropped from the matrix, then transmitted to the next processing station. The vibrating table receives the next pallet and the process is repeated.

 During vibration compression molding, the vibrations transmitted to the die via the molding pallet cause shocks between the elements of the vibrating system. This results in the appearance, in products, of various integrity defects, such as cracks, strata, crown formations.

 It has therefore been proposed to create a device for molding products from plastic materials, in which the matrix would be produced so as to suppress the action of vibrations on the plate of the matrix and on its parts, which would improve the quality of product molding.

 The solution consists of a device for molding products from plastic materials, comprising a vibrating punch actuated by a jack, a vibrating table mounted on shock absorbers and a matrix mounted on columns so that it can execute a reciprocating rectilinear movement to using jacks fixed to a fixed cross member, said matrix being, according to the invention, constituted by a plate, an attached molding element, mounted freely in this plate, and adjustable stops.

 The matrix thus produced makes it possible, during compression with vibration, to stabilize the vibrations transmitted to the matrix via the molding pallet and to give them the desired characteristics by adjusting the eye between the stops of the element. reported and plaque. The attached molding element is animated by a rectilinear movement in common with or with respect to the plate, and its stroke is limited by the stops.

 In what follows, the invention is explained by the description of a nonlimiting exemplary embodiment illustrated by the single appended drawing which represents an overview of the proposed device for molding products from plastic materials.

 The device comprises a vibrating punch 1 actuated by a jack 2, a vibrating table 3 mounted on shock absorbers 4, and a matrix 5 mounted on columns 6 so that it can be actuated by an alternating rectilinear movement by jacks 7 fixed to a fixed cross member 8.

 The columns 6 are mounted on a frame 9 The matrix 5 is made composite. It is constituted by a plate 10 and by an attached element II mounted freely in this plate and comprising adjustable stops 12 and 13.

 The device operates as follows.

The plastic material, for example concrete, is poured into the matrix 5 placed on the pallet 14 of the vibrating table 3. The added element It then rests on the pallet 14 and the plate 10 is supported on the stop 13 by its lower surface. Then the vibrating punch is lowered 1. The added element Il resting on the pallet 14 then descends with the vibrating table 3
Between the stops 12 and 13 mounted on the insert 11, on the one hand, and the plate 10, on the other hand, games are formed which protect the plate, and consequently, all the other parts, against the action of vibrations.

 To unmold the product, the die 5 is brought up to its high position. The added element It abuts against the plate 10 by its stop 12 and the product remains on the pallet 14.

 The clearances which form between the stops 12, 13 and the plate 10 can be adjusted in order to modify the intensity of the process.

 Of course, the invention is in no way limited to the embodiment described and shown which has been given only by way of example. In particular, it includes all the means constituting technical equivalents of the means described, as well as their combinations, if these are executed according to the spirit and implemented in the context of protection as claimed.

Claims (1)

 RESELL I CATI ON  Device for molding products from plastic materials, of the type comprising a vibrating punch actuated by a jack, a vibrating table mounted on shock absorbers and a matrix mounted on columns so that it can perform a reciprocating rectilinear movement using cylinders fixed to a fixed cross member, characterized in that the matrix is constituted by a plate, an attached molding element, mounted freely in this plate, and adjustable stops.