FR2460736A1 - Knock=out plant for foundry sand moulds - where moulding sand and core sand are reclaimed separately at two adjacent work stations, so the two sands are not mixed together - Google Patents

Abstract

Each mould is lifted by a pair of tongs and transported to a first work station (A) which contains rotating wire brushes removing the moulding sand, so the latter drops into a hopper (T1). A second pair of tongs then carries the castings from station (A) to a second station (B) consisting of a conventional knock out grid, from which the core sand falls into a second hopper (T2). Each pair of tongs is mounted on a trolley reciprocated on top of a portal by a single hydraulic cylinder, so that when a mould from a conveyor belt to station (A), a cluster of castings is simultaneously transferred from station (A) to station (B).

Description

The present invention, due to the collaboration of Mr. Guy STEYDLE, relates to an installation for stalling in two stages so as to allow the separation of the rolling sand from the coring sand, in order to avoid their reelection at the level of the hourglass.

For stalling problems, vibrating grids are generally used, after knocking off the mold or separating the root ball, which have the disadvantage of mixing the two types of sand. Therefore a very delicate problem is posed at the level of the sandbox.

The present invention proposes to solve this problem this separation of the molding sand from the coring sand by providing an installation for selective release of foundry parts, comprising, mounted on a frame or gantry, a mobile assembly consisting of two conveyors provided with means for prebausing the clusters of parts originating from molding, and driven by an alternating translational movement by a motor means, one of the carriers gripping the clusters of parts brought by a conveyor to transfer them, following a one-way journey from the mobile equi page to brushing means cooperating with a clamping device disposed at a first station where the molding sand is released in a given time, after which the second conveyor, following a return journey from the mobile equipment, comes to pick up the pieces to transfer them to a second station where there are provided means for detaching, known per se, the core sand, said first conveyor having been moved, on this return journey, to enter a new cluster of parts for a new cycle.

The invention is further remarkable by the following points
- the carriers of the mobile assembly consist of two carriages suspended by rollers from the gantry and mounted, at a certain distance from each other, on a rigid element actuated by a motor member, for example the rod a hydraulic cylinder
- the gripping means of the second transporter or carriage are mounted on an elevator-descender device
- an automatic control system, possibly @@@@ é with timer, allows synchronization of di féran @ s organce movements, and adjustment @u @e ps of bressage.

The invention will be better understood on reading the following nonlimiting description of an embodiment of an installation for the selective unhooking of foundry parts, with reference to the attached messin, the single figure of which is a side view of such an installation. .

On the transverse beam @a of a gantry 2 is provided a guide path for two carriages 3, 4 suspended there on rollers a and mounted at a certain distance from each other on the rod Sa of a jack hydraulic 5, itself fixed to said gantry.

Each carriage 3, 4 is provided with a set of clamps 6.

h a station A located below the closest position that the charoit 3 can have relative to the jack 5, is mounted c brushing device 7 with rotating brushes made up of radiating and flexible wings, arranged so as to be as efficient as possible with respect to the geometry of the parts to be checked and cor-randées by jack or the like.

At a station B located below the closest position that the carriage 4 can have relative to the jack, is mounted a release grid R of the conventional type.

Under stations A and B, hoppers T1 and T2 are respectively arranged.

This release system works as follows
Simultaneously with the start of the carpet 1 on which the pieces poured into the clods and coming from the molding machine arrive step by step, the carriages 3 and 4 are then driven by a transfer movement under the action of the hydraulic cylinder 5 .

By its clamps 6, the carriage grasps the parts cast in the clods by their casting system and transfers them from the end to the carpet 1 to station A, the carriage 4 ensuring the movement of the other cluster of parts of the station h at station B, that is to say on the stall grid. At the post A cluster of parts is de-osed on a support and clamped on it while the clamps o of the carriage 3 release,
At station A the rotary brushes 7, for example of the rotary motorbike type, are brought by means of their control jacks, or similar devices, into contact with the outer faces of the parts to be unchecked and thus cause the disintegration of the molding sand coating them. . This sand falls into the hopper T1 while the core sand remains inside the parts. Simultaneously the carriage 4 had taken over the cluster of parts previously deposited at station A to bring it to station B. At this location the cluster of parts is placed on the conventional release grid. The clamps of the carriage 4 are themselves mounted on an elevator-descender 8 which, at the end of the race when the cluster of parts is deposited on the release grid, forces on the casting system thus ensuring the separation of the parts. The vibrating release grid having at this time the purpose of vibratingly clearing the parts of their coring sand which falls into the hopper T2. 8 having reassembled the carriages 3 and 4 under the effect of the drive member 5 return to their original position and a new cycle begins again.

It is obvious that the selective release system according to the invention is in no way limited to the embodiment described above with reference to the attached drawing, but that it encompasses all variants and modifications, b the scope of the '' skilled in the art, resulting from the same basic principle of a selective stall by brushing supplemented by a final stall by vibrati (ne.

This is how the invention, which is applied to a clod molding installation, could in the same way be extended to a frame molding site, after a usual prior operation in this case of removal of the chases.

Claims (2)

1. Installation for selective release of foundry parts, in particular intended for separating the molding sand from the coring sand to avoid their mixing at the level of the sand-making plant, characterized by the fact that it comprises, mounted on a frame or gantry, a movable assembly consisting of two conveyors provided with means for gripping the clusters of parts originating from molding, and animated by an alternating translational movement by a motor member, one of the conveyors gripping the clusters of parts brought by a conveyor transfer them, following a round trip of the moving equipment to a first station where brushing means are arranged cooperating with a bricage device so as to achieve in a given time the release of the molding sand, after which the second conveyor , following a return path of the mobile equipment, comes to seize said parts to transfer them to a second station where there are provided means for detaching, known in themselves, the sand from the core. au, said first conveyor having moved, on this return journey, to seize a new cluster of parts for a new cycle. 2. Installation according to claim 1, characterized in that the transporters of the mobile assembly are constituted by two carriages (3, 4) suspended by rollers G at the gantry 2 and mounted, at a certain distance one of the other, on an element, .. ent. rigid actuated by a driving member, for example the rod Sa of a hydraulic cylinder 5. 3rd installation according to claim 1 or 2, characterized in that the gripping means, or clamps 6, of the carriage 4 are mounted on an elevator-descender device 8. 4D Installation according to one of claims 1 to 3, characterized in that there is provided an automatic control system, optionally program with timer, for synchronizing the movements of the various organs, and adjusting the brushing time.