FR2602440A1 - DEVICE FOR CLEANING SAND RESIDUES FOR CORE PROJECTING MACHINE - Google Patents

Abstract

A. DEVICE FOR CLEANING SAND RESIDUES FOR CORE SPRAYING MACHINE. B. ESSENTIALLY CHARACTERIZED IN THAT THIS PLATFORM 6 IS JOINED IN A ARTICULATED WAY TO A SUPPORT FIXED ON THE CHASSIS 1 OF THE MACHINE WHICH INCLUDES, IN ITS CENTRAL AREA, TWO LEVERS 10 CONNECTED IN AN ARTICULATED WAY TO THE LATTER, AND WHICH, BEING ORIENTED DOWN, RECEIVE THE PUSH OF TRANSVERSE BOLTS 9 ATTACHED TO A LATERAL EXTENSION OF THE WORKTABLE PROPERLY CALLED OF THE CORE PROJECTING MACHINE, AS THE NECESSARY TILTING MOVEMENT OF THE PLATFORM 6 'ELIMINATION OF SAND RESIDUES, EITHER OBTAINED DIRECTLY THANKS TO THE NORMAL VERTICAL MOVEMENT OF THE WORK TABLE. C. THE INVENTION RELATES TO A DEVICE FOR CLEANING SAND RESIDUES FOR A CORE SPRAYING MACHINE.

Description

Device for cleaning sand residues

  for projecting machine cores ".

  The present invention relates to a device designed for cleaning the remaining sand residues on the projection plate of the cores casting machines at the end of each phase of work, which cleaning must be carried out periodically, and

  variable depending on the accumulated amount of these 10 residues.

  As is well known, in kernel spraying machines, a powerful jet of compressed air is applied to a cartridge containing sand for

  projecting the latter on a kernel boot, this boot 15 having been previously installed on a projection plate, which is installed on a carriage which makes it possible to install the kernel boot and then locate it in front of the projection mechanism of the sand.

  In practice, there is a certain amount of residual sand which moves on the projection plate and for the elimination of which has been provided

  the cleaning device according to the invention.

  The Applicant is the owner of Utility Model 288 889, which consists of a sand residue cleaning device, for a kernel spraying machine, in which the installation of a platform, laterally by relative to the 2, frame of the machine-platform to which the projection plate can move to perform the cleaning operation. More particularly, this platform can move in the vertical direction, using a cylinder, to raise and lower the projection plate, and it has lateral claws for fixing the plate in question, in turn hydraulically actuated . by means of the corresponding cylinders, the cleaning operation taking place after the attachment of the plate 10, by means of a sudden lateral tilting of the latter, and for this purpose the platform rests on a support by means of a transverse axis, lateral and external, this platform being actuated, by means of a rod moved in a hydraulic cylinder installed on the support of the platform and which can also rock. An adjustable height stop, located in front of the tilting axis of the platform,

  determines the static rest position of the latter.

  This solution, although perfectly acceptable from the point of view of operation, presents in practice a fundamental problem which consists of its extreme construction complication and consequently its high cost, since all the mobile elements of the device must be actuated by corresponding hydraulic or pneumatic cylinders which require, for their proper operation, a source of pressurized fluid, control valves, and a circuit for programming their operation, a complex construction which gives rise to the high cost mentioned above and to which we must add the

cost of essential maintenance.

  The cleaning device according to the invention has been designed to provide a completely satisfactory solution to this problem, based on the same operating philosophy. The features of this device, which utilizes a tilting platform for receiving the projection plate, to fix it in a suitable manner and to pivot abruptly outwardly to eliminate the sand residues present on the latter, are centered on a special construction that provides a

  significant simplification, with a corresponding reduction in the cost of manufacture as well as the maintenance of the device 10 afferent.

  The sand residue cleaning device is essentially characterized in that this platform is hingedly connected to a fixed support on the frame of the machine which comprises, in its central zone, two levers connected in an articulated manner to this last, and which, being oriented downward, receive the thrust of transverse bolts duly attached to a lateral extension of the actual working table of the machine to project the cores, so that the necessary movement of tilting of the plate -form for the removal of sand residues, obtained directly through the normal vertical movement of the work table; in that the levers which connect the upper platform to the bolts associated with the working table of the machine, have at their lower end the shape of a fork, so that can be established between these elements a removable connection and that when the device is in the working position, these levers are located on the passage of bolts associated with the table, while the lateral tilting of these levers and their corresponding attachment allow the device to be inactive during the movements

normal verticals of the table.

For this purpose, and more

  In fact, the invention consists in using the displacements of the working table of the machine for projecting cores to perform the cleaning operation, both with regard to the installation of the projection plate on the platform. tilting form and fixing of this plate, that the tilting of the platform, in

  completely eliminating the complicated system of hydraulic cylinders that was indispensable with the previous solution.

  More specifically, and in accordance with these objectives, the invention consists in fixing on the frame of the machine to project the cores, at the appropriate location, a fixed support, projecting laterally, at the free end of which is connected in a hinged manner the tilting platform, which is supported by its inner edge on an adjustable stop, in a manner similar to that used in utility model 288 889; the only difference being that these elements, this articulated connection and the releasable abutment are installed on a fixed support instead of being on a support which can move upwards. On the other hand, the work table of the machine, which can move vertically, has a lateral extension which is located below the tilting platform, this extension being endowed in turn

  a transverse bolt which connects it to the tilting platform, more precisely using a lever hingedly connected to these two elements, that is to say the bolt of the extension of the table and the Tilting platform at a point substantially away from its tilting axis.

  It is obvious that, thanks to this construction, the table causes, during its upward movement and by means of the lever in question, the tilting of the platform necessary to eliminate the sand residues, without it being necessary. to use, to achieve this tilting, any accessory such as, for example the hydraulic cylinder

  indispensable in the previous solution.

  On the other hand, to make the fixing of the projection plate on the tilting platform, so that during the tilting of the latter, it is not projected outwards at the same time as the sand, it It has been planned to install lateral locking devices that are pivotally mounted on the receiving platform of the projection plate, the locks themselves of this locking device being located at their upper end in an active position relative to the projection form, while these lateral locking devices have at their lower end rollers which, in the rest position of the assembly, rest on the fixed support, determining the inactive position of the locks, while, immediately after the beginning of the tilting movement of the platform, when these rollers separate from the fixed support, springs located for this purpose tend to make basc in the direction of closure, that is to say towards the locking position of the projection plate, and therefore in this way, the fixing of the projection plate on the tilting platform is obtained. by means of the movement of the working table of the machine, that is to say without it being necessary to use special actuation means such as for example the cylinders which are

  indispensable in utility model 288 889.

  To ensure the proper tilting of the locking devices in the direction of their opening, when the tilting platform goes down to its rest position, it was 6, provided that the fixed support has, in front of the rollers of these devices locking, respective inclined planes that favor the tilting in the appropriate direction. On the other hand, another feature of the invention is that the lever or levers, preferably two in number, are provided by means of which the upward movement of the table to the platform is transmitted. form, by transforming it into a tilting movement of the latter, are connected in an articulated manner, but in an unfriendly manner, to this tilting platform, by their upper end, while at their lower end, they have the shape a fork, to be removably connected to the bolt of the table, on which they rest under the effect of gravity, when it is desired that the cleaning device comes into action, while During the other phases of work of the machine in which it is not necessary this tilting of the cleaning platform, it will suffice to ensure that these levers stop being located vertically, thanks to established fixing means to this ef fet, and therefore, not being located on the passage of the bolt of the table 25 during the normal elevation of the latter, the levers will not be subject to the effects of displacement

of the table.

  It may be of interest that the worktable can be moved downwards, and therefore the cleaning device can also tilt down during the cleaning phase, thus avoiding the need to remove the nozzles. injection of sand and throwing of gas during this cleaning operation, an advantageous solution, not only because of the elimination of these manipulations, but also because it sometimes happens that by removing the nozzles that inject the agglomerated sand , these nozzles cause some of the residual sand, and make it

  falling inside the machine, because the height of the sinter of sand is greater than that of the projection plate.

  For this purpose, the fixed support is eliminated and the articulated connection gussets of the tilting platform are fixed directly on the frame of the machine. On these gussets are mounted articulated arms that are rigidly fixed to the tilting tray, in this case on the edge thereof which is located near the frame, while maintaining the pair of levers articulated on the area 15 center of the tilting platform, which instead of tilting up, as in the previous case under the effect of tilting the table, the platform switches down, under the effect of his

  Its own weight, because the points of support, which is endowed with the table, move downwards.

  In a complementary way and to ensure the horizontality of the tilting platform, in the areas without support during the working phase of the machine, there is provided a fastening mechanism consisting of two parallel arms, associated with the machine structure whose ends located vis-à-vis are likely to be placed under the tilting platform, in the active position, or to allow the tilting of the latter, when the arms in question are subjected to traction which tends to

to move them away from each other.

  This different mobility of the tilting platform in turn makes it necessary to make slight modifications in the rusting devices of the projection plate, which consist in that parts at their lower ends are bent, in this case towards the outside and the rollers act on inclined planes which, in this case,

  are oriented downwards and outwards.

  Other characteristics and advantages of the invention will be better understood on reading the following description of an example of embodiment and with reference to the appended drawings, in which:

  FIG. 1 represents a front elevational view of a sand residue cleaning device for nucleus spraying machines, produced in accordance with the subject of the present invention and in which only one of its two lateral halves, since the other half is perfectly symmetrical with respect to the first half; FIG. 2 represents a side elevational view of the assembly represented in the preceding figure, in

  which is represented in continuous pattern the device 20 in the rest position and, in discontinuous route, the device in tilting or cleaning position.

  - Figure 3 shows a representation similar to

  that of Figure 1, but which corresponds to the practical embodiment in which the platform tilts down during the cleaning phase.

  FIG. 4 shows a representation similar to that of FIG. 2, which corresponds to the practical embodiment of the preceding figure and in which the net-cleaning device is represented in a discontinuous pattern in the rest position, and in continuous line drawing;

  tilting or cleaning position.

  In these figures, it can be seen that the cleaning device according to the invention is based on the fixing, on the frame 1 of the machine to throw the cores, a fixed support 2 which protrudes horizontally and laterally, on the free end of which, and with the aid of upper gussets 3, is connected in an articulated manner, by means of the axis 4 and the corresponding gussets 5, a tilting platform 6, intended to receive the projection plate, not shown in the figures, for the cleaning of the latter. This articulated connection is completed, in

  the initial sector of the fixed support 2, by an adjustable height stop 7 which determines the stable rest position of the tilting plate 6, in agreement with the continuous pattern representation of FIG.

  The tilting of the platform 6 on its axis 4 is effected by means of the working table 8 of the machine, a table provided with a lateral extension, which is also clearly seen in FIG. which is located below the cleaning device, extension completed by a transverse bolt 9, which serves to transmit its movement to the tilting platform 6, with the aid of a pair of levers 20 10, hingedly connected by their upper end 11 to the tilting platform 6 and which can be coupled by their lower end to the respective bolts 9 of the work table 8 of the machine, the lower end having the shape of a fork 12 so that the connection to these bolts 9 is removable, that is to say that the levers 10 and the table 8 can be easily separated, more precisely when it is desired that during the movements of

  Work of the table 8, the cleaning device is inoperative.

  Since, as can also be seen in the figures, the levers 10 must pass through the installation zone of the fixed support 2, the latter has the shape of a "U" -shaped half-frame which is fixed to the frame 1 by the free ends of his

side branches.

  Finally, and in order to complete the described construction, in order to fix on the tilting platform 6 the projection plate to be cleaned, it has been provided that on the side and opposite edges of this platform 6 are hingedly connected to the latter, more specifically at 13, tilting locking devices 14, whose upper end 15 constitutes the lock and which is provided with the appropriate configuration for fixing the projection plate, while the lower end 16 of these devices the locking device is bent inwards and is terminated by a roller 19 which bears on the fixed support 2, tending to cause the locking devices 14 to adopt an inactive or opening position, ie say the position shown in Figure 1, in which springs 17 are stretched, the fixed support 2 being provided with shims 18 which are inclined planes which promote the appropriate tilting of these locking devices in the sense

opening of these.

  In accordance with the described construction, the operation of the cleaning device is as follows: Starting from the rest position shown in FIG. 1, in which the tilting platform 6 rests on the adjustable stop 7 and in which the 14, 15 are in the open position, the lower end 30 of the levers 10, and more precisely their forks 12, are located on the passage of the bolts 9 associated with the lateral extension of the work table 8 of the machine , and consequently, when the latter rises, it meets during this trajectory 35 the levers in question 10 and by means of the latter, it transmits to the tilting platform 6 an upward movement, which is equivalent to beginning of these movements, to make that the lateral locking devices 14 also separate from the fixed support 2. Therefore their lower part, with respect to their point of change 13, is projected outwards under the effect of the springs 17, while the latches 15 close on the projection plate, by fixing it, and consequently the assembly constituted by the tilting platform and the projection plate tilts, in the direction of the arrow shown in Figure 2, and in agreement with the discontinuous plot representation of this figure, and this sudden tilting gives rise to the removal of sand residues exis15 both on the plate of projection. When the working table 8 of the machine descends again, the tilting platform 6, with the corresponding projection plate, tilts in the opposite direction, that is to say in the downward direction and opposite to that of the arrow of the FIG. 2, towards the limit position represented in a discontinuous line in this figure and limited

by the adjustable stop 7.

  Obviously, when it is desired that during the normal vertical movements of the table 8, the cleaning device is inactive, it will be sufficient to move the two levers 10, and more precisely their lower ends and forked 12, relative to the passing area of the bolts 9 associated with the table, fixing by any means these levers 10 in this position of lateral displacement, so that the table 8 does not act on the levers during its movements and therefore n ' do not act

  on the cleaning device as a whole.

  In a complementary manner and in accordance with the embodiment shown in FIGS. 3 and 4, when it is desired that the tilting of the platform occurs downwards, the basic construction of the prior solution is retained, in this respect. relating to the attachment to the frame 21 of the machine to project the cores, in a suitable place, a support which, in this case, consists of simple ears 23 fixed directly to the frame in question, ears on which are articulated, by means of

  the hinge axis 24, arm-shaped gussets 25, which are rigidly fixed at their other end to the tilting platform 26, more precisely in correspondence with the edge of this platform close to the frame 21, so that these arms are perpendicular to the general plane of this platform.

  - The tilting of the platform 26 on its axis 24, also as in the previous case is achieved by the work table 28 of the machine, provided with a lateral extension which is located under the cleaning device, extension which is 20 is terminated by a transverse bolt 29 from which the movement is transmitted to the tilting platform 26 by means of a pair of levers 30 hingedly connected at their upper end 31 to the platform 26 and which can be connected at their lower end to the respective bolts 29 of the work table 28 of the machine, this lower end having the shape of a fork 32, so that the fixing of these bolts is removable, that is to say say that the levers 30 and the table 28 can be separated easily, especially when it is desired that

  During the work movements of the table 28, the cleaning device can not operate.

  To maintain the projection plate to be cleaned, which is also not shown in these last two figures, suitably fixed to the platform 26 during the tilting of the latter, it is also used rocking locks 34 connected in an articulated manner at the platform 26 on the tilting points 33, locks whose upper end 35 constitutes the actual lock of adequate shape to ensure the attachment of the projection plate, while their lower end 36 is bent, in this case to the outside, and ends with a roller 39 which is supported on an auxiliary support 40 fixed directly to the frame 21. This tends to cause the latches 34 to adopt an inactive or opening position, shown in Figure 3 against the effect of tension of the springs 37 which tends to close these latches, and for this purpose are formed, on the auxiliary support 40 in question, wedge-shaped inclined planes, which favors the tilting of the latches in the direction of their opening, when the raising of the tilting platform to its horizontal normal position occurs, and for this purpose the inclined planes 38 are oriented downwards and outwards, as we

see also in Figure 3.

  Finally, since the levers 30 are not fixed on the work table 28, but are merely supported on the latter, as has been said above, there is provided a mechanism for fixing the platform in a horizontal position, concretely in zones devoid of support for the latter, in the working phase of the machine, a mechanism consisting of two arms 41, parallel, which emerge horizontally from the frame 21 of the machine and whose ends comprise rods 42 capable of move axially so that in a position, that shown in Figure 3, the inner end of these rods 42 is below the

  tilting platform 26 in its outer marginal zone

  opposed to its tilting zone, to hold it in this horizontal position, while when acting on the rods in question 42 in the direction of the arrow shown in FIG. 3, the inner ends thereof are located outside the operating area of the tilting platform 26 and the system

  cleaning switchover comes into action.

  Therefore, as can be deduced from the above, the movements necessary for the cleaning device to carry out the function for which it has been provided, that is to say the movements of fixing the plate of projection and lateral tilting for the cleaning of the latter, are obtained through the displacement of the conventional working table 8 of the machine, which gives rise to a substantial simplification of the

construction of the device.

  the materials, shape, dimensions and arrangement of the elements may be subject to variations provided that this does not give rise to

  subject to an alteration of the essential principle of the invention.

  The terms in which this memorandum was written must always be taken in a broad and non-limiting sense.

1.5

R E V E N D I CA T I 0 N S

  1) Device for cleaning sand residues for kernel spraying machines which, being of the type which comprises a tilting platform (6) intended to receive the projection plate, hingedly connected to a support by one of its ends and which rests on this support, at its other end, with a stop adjustable in the direction of the height, characterized essentially in that this platform (6) is hingedly connected to a support fixed on the chassis (1) of the machine which comprises, in its central zone, two levers (10) hingedly connected to the latter, and which, being oriented downwards, receive the thrust of transverse bolts (9) duly fixed to a lateral extension of the actual working table of the machine to project the cores, so that the necessary tilting movement of the platform (6) for the removal of sand residues, is obtained directly 20 gra this to the normal vertical displacement of the work table. 2) A sand residue cleaning device for kernel spraying machines according to claim 1, characterized in that the levers which connect the upper tilting platform (6) to the bolts associated with the work table (8). of the machine (1), have at their lower end the shape of a fork (12), so that can be established between these elements a removable connection and that when the device is in the working position, these levers (10) are located on the bolt passage

  associated with the table, while the lateral tilting of these levers and their corresponding attachment allow the device to be inactive during the normal vertical displacements of the table.

  3) Sand residue cleaning device for kernel spraying machines, according to

  any of claims 1 and 2, characterized in that

  at the lateral edges of the tilting platform (6) 5 are articulately connected locking devices (14), in each of which, and more precisely at their upper end (15), the lock is formed, for the fixing to the platform of the projection plate before the tilting thereof, 10 while at their lower end (16) they comprise a roller (19) which rests on the fixed support and which tends to make swinging these latches by overcoming the effect of the corresponding spring voltage, to an open position or inactive position, all so that at the beginning of the tilting of the platform and after a slight separation of the latter by relative to the fixed support, the roller separates from the latter by allowing, thanks to the elastic spring restoring force of the springs, the tilting of the bolts towards the closed position; being provided the presence on the fixed support and in front of the roller in question, respective shims which have inclined planes which facilitate the tilting of these locks, overcoming the force of the springs (17) which they are equipped and in the direction when the tilting platform (6) descends towards its maximum rest and approach position relative to the fixed support, the limit position determined by the stop

adjustable (7).

  4) Device for cleaning sand residues for kernel spraying machines, according to claim 1, characterized in that, when a downward tilting is provided for the tilting platform, in correspondence with the edge of this platform close to the frame of the machine, are fixed on the latter perpendicularly and downwards, arms which are connected in an articulated manner to the frame of the machine with the aid of ears (23) directly integral with this frame, to which are also connected two parallel arms (41) and horizontal, located outside the tilting platform and each having at their free end rods (42), which can move axially and are located vis-à-vis, way that these rods can be located by their 10 free ends under the tilting platform while maintaining the latter in a horizontal position, despite the movements of the work table of the machine and despite the non-existence support means during the working phase of the latter, which rods can be removed manually to release the tilting platform, the latter then adopting a position in which the residue cleaning device is disabled. ) A sand-cleaning device for coring machines according to claim 4, characterized in that the fixing locks of the projection plate on the tilting platform (6, 26) comprise at their lower end a elbow facing outwards, on which are located the rollers, with the particularity that they are on auxiliary supports fixed directly to the frame on which are formed inclined planes, wedge-shaped, facing downwards and towards the outside, so that in the position of maximum elevation of the tilting platform (6, 26), which corresponds to the horizontal position of the latter, the rollers bear on these inclined planes

  and the latches are pushed to the disengage or release position of the projection plate.