FR2517288A1 - Mould for prefabricated concrete sections - has pivoting cradle with grips which are operated by rams inside frame - Google Patents

Abstract

The pallet is for moulding and palletising prefabricated concrete items which can be repeated or of different types. It has a pivoting cradle with a frame (1) mounted on the spindles (2) of horizontal positioning stops. Two groups of high and low grips hold tools and there are other grips to hold different products. The grips have fingers (8,9) protruding from holes in the tools actuated by rams (4). The stops have shutters which can retract under ram (10) action. The rams are housed in the smaller sides of the hollow frame.

Description

 The present invention relates to a spreader for molding and palletizing precast concrete products, operating in immediate demoulding as well as in deferred demolding.

 Current methods which use known means of this kind are capable of only one of two operations and are generally specific and very productive, it follows that the user who wants to be fully equipped from a qualitative point of view must acquire two distinct materials, clodding, bulky and overproductive in their specialty.

 The main object of the present invention is to remedy these drawbacks by providing a versatile lifting beam capable of carrying out all the operations encountered in molding and palletizing both immediately and deferred, by programmable automatic control of a single structure. mechanical.

 To this end, the lifter according to the invention is essentially characterized in that it comprises, in combination, a frame mounted on trunnions which completely surrounds the molds or the products, combined gripping means for gripping the immediate or deferred molds, combined gripping means for gripping immediate or deferred products, means for guiding and positioning the frame relative to the tools, external handling means and a programmable automatic device.

 In a particular form of the invention, the gripping means are arranged inside a frame and include a group of fingers capable of engaging on the immediate or deferred tools, a group of pliers capable of gripping the products immediate or to retain the deferred products in the molds until their exit, a group of stops intended to ensure the positioning of the frame in the vertical plane.

 It is understandable that such a spreader is very practical to use in factories manufacturing concrete products since, associated for example with an automatic overhead crane, it can constitute a fully autonomous robotic assembly capable of total versatility by programming.

 An embodiment of the invention is described below by way of example, with reference to the accompanying drawings in which - the board 1 is a representation of a lifting beam according to the invention - the board 2 represents the integration of a lifting beam 13 in accordance with the invention in an automatic machine for the production of fence posts.

- Plate 3 represents 4 basic cases of operation of the lifter - Figure 3 corresponds to the palletization of. deferred products - Figure 4 corresponds to the palletization of immediate products - Figure 5 corresponds to immediate molding - Figure 6 corresponds to deferred molding.

 The lifting beam, shown in the drawings first comprises a frame in the form of a hollow frame 1 of prismatic section which carries at its ends two pins 2. Inside the side members of this frame whose section is narrowed move two door bars clamps 3 actuated by the cylinders 4, the clamps proper 5 fitted at their end with rubber protrude strongly inside the frame when the cylinder 4 is actuated in retracted rod.

 The various boxes communicate with each other by recesses to allow the circulation of the pipes, a bodywork forming a casing contributes to the prevention of accidents.

 The frame also carries four guide blocks 7 from which two groups of fingers 8-9 can come out which will be called high fingers or low fingers in the following, associated with their jacks 10.

 A set of stops 11, 12 allows the lifter to bear on the tools to be gripped, which ensures precise positioning of the fingers 9 in the vertical plane.

 Plate 2 is an example of integration of a spreader according to the invention in a robotic chain and shows this in its overall appearance 13, driven in rotation 14, up and down 15, translation 16; by an overhead crane 17 in different exchange programs between six zones; vibrating table 18, waiting before 19, stack of fresh 20, stack of dry 21 mold stock 22, palletizing area 23.

 The lifter operates from 4 basic configurations of its means which can be analyzed using the sectional views of the board 3 in which the immediate mold 24 can be seen, represented in the example by a fence post mold. , and the delayed molds 25 shown in the example by a fence plate mold; posts and plates being respectively privileged cases of species of the immediate and deferred functioning.

 The plate mold is of the reversible pallet type which is the subject of another presentation; in its face forming a bowl, the concrete which will harden is poured in, on its back forming a tray, the fence posts are removed from the mold (hence the expressions deferred or immediate).

 FIG. 3 shows how the lifter, after having been placed on the mold on the plate side (in zone 21), grasps the said mold with the lower fingers and locks the dry plate by exiting the clamps.

 Figure 4 shows the same docking in zone 21, but for the dry posts, we see that the configuration is the same for both cases and that on the other hand, we can turn the lifter from 1800 to deposit by lowering the one - either the plate or the posts after opening the clamps, the frame keeping the pallet in his fingers which have become high (this operation is done in zone 23).

 FIG. 5 shows a phase of the immediate demolding process, the immediate mold and the pallet held together were turned over from 1800 without there being any risk of the products falling, then the pallet being placed on a support (zone 19), the fingers are opened low and the lifter is raised, which causes the release from the mold, a reciprocal inversion makes it possible to replace the empty mold in the place on the vibrating table (zone 18).

 FIG. 6 shows how the lifter organizes the exchange of an empty deferred mold with a full deferred mold (between zones 18 and 19); the mussels always remaining upright; at the start, the frame holds an empty mold in its high seats, it docks on the vibrating table 18 the full mold, takes out its low fingers, removes this full mold and transfers it to the wait before 19, then it returns to deliver the mold empty on the vibrating table 18.

 Certain ancillary programs require that the stops 12 be eclipsable, an alternative embodiment consists in constructing them in the form of flaps which are eclipsed by rotation under the action of associated jacks.

 Finally, it is easy to see that the lifter can carry out all the transfers, stackings and destackings imaginable by docking, low fingers retracted or extended; thus, there are a practically unlimited number of applications in the field of molding, demolding, palletizing of precast concrete products, in particular, whether these are produced immediately or on a delayed basis.

Claims (4)

 1. Lifting beam for molding and palletizing of precast concrete products immediately or deferred, of the pivoting cradle type characterized in that it comprises, in combination, a frame mounted on trunnions of the horizontal positioning stops, two groups of high grippers and stockings capable of grasping immediate or deferred tools, middle pliers capable of grasping immediate products and retaining deferred products, external handling means and an automatic control organizing the different operating sequences by computer programming.  2. spreader according to claim 1, characterized in that the grippers are fingers which project into holes drilled in the tools, under the action of associated jacks.  3. spreader according to claim 1, characterized in that the docking stops are in the form of eclipsable flaps under the action of associated jacks.  4. spreader according to claim 1, characterized in that the clamps are actuated by associated jacks housed in the short sides of the hollow frame.