FR2481966A1 - DISMANTLING DEVICE FOR FOUNDRY INSTALLATIONS - Google Patents

Abstract

RELEASE DEVICE APPLIED TO MOLDING MACHINES IN FOUNDRY FACILITIES. THIS DEVICE ALLOWS A BALANCED SUPPORT PLAN FOR THE CHASSIS AND INCLUDES SUPPORT ELEMENTS 34 WHICH ARE AUTOMATICALLY AT THE CORRECT LEVEL TO SUPPORT THE FRAME IN THE HORIZONTAL PLAN DESPITE ANY DEFORMATIONS OF THE BASE OF THE CHASSIS 34, BEING PLACED SENSITIVELY AT THE FOUR CORNERS OF THE CHASSIS AND CAN BE LOCKED IN THE CORRECT POSITION BY A SMALL PISTON-SHUTTER 52 WHOSE FEEDING IS CONTROLLED BY THE PNEUMATIC MOLDING-RELEASING SYSTEM OF THE INSTALLATION. APPLICATION TO FOUNDRY INSTALLATIONS IN GENERAL.

Description

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  The present invention relates to a release device for foundry installations and machines and more particularly for installations of the kind in

  which the molding frames are automatically transferred

  the molding station and from there to the successful positions

machining stops.

  At the molding station, the model plate pushes, from the bottom up, the frame which, when it reaches a certain height, is immobilized and filled with packed sand

then by the usual means.

  As the molding is thus executed, the model plate is lowered together with the chassis to the level of

transport plan.

  The model plate continues to descend, priming

  the demolding operation itself, at the end of the

  the chassis resumes its journey from the molding station which will successively occupied by new chassis.

  The operations just described concern

  facilities already known in this field of technology.

  Picnic. The continuous use of the chassis ends, however,

  due to their deformation, in particular due to the

  high levels to which they are exposed during

casting phases.

  It often happens that after a certain

  number of uses, as a result of the precise deformations

  the lower surface of the chassis no longer applies exactly to the support plane consisting of the release rollers or pins of the transfer station of the

molding.

  Because of this precarious state of support, when

  the demolding process begins, the chassis is

  cited to take an untimely position of support on the pebbles. This relative displacement between the molded frame and

  the model translates into a solicitation that is trans-

  sand, which sometimes causes it to break

  re-tearing in parts with less resistance

  tance and / or demoulding is difficult. To avoid this

  disadvantage, until now it had been necessary to

  support face of the stirrups to periodic rectification operations in order to restore the co-flatness. However, these operations, apart from their cost, ended in the long term by unacceptably reducing the

  height of the chassis which was therefore

goal and replaced.

  Given the high unit price of chassis and production losses, it had become essential to consider a satisfactory solution to this problem.

  problem, and this is precisely the purpose of this

  vention. The technical problem to be solved in order to achieve this goal was to create a new uniform support for

  the deformed frames, this support being able to adapt automatically

  in turn, at each possible distortion possible.

  the support plane of the chassis itself.

  The solution envisaged according to the present invention for solving this technical problem is characterized in that

  that there are four hydraulic cylinders, the pistons

  are actuated to form support members whose levels automatically adapt to the chassis during the demolding phase, and a simultaneous immobilization system of the four pistons mentioned above to stop the movement of the chassis relative the model support tray which, by continuing its downward stroke, thus executes the demolding operation of

correct way.

  Other features and benefits will emerge

  during the following description of a preferred mode of

  embodiment of the invention which refers to the drawings

  embedded image, in which: FIG. 1 is a schematic perspective view of the installation in which the device has been incorporated;

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  according to the invention; Figure 2 is a plan view of the installation of Figure 1; Figures 3 and 4 show in detail part of the installation of Figure 1, and

  Figure 5 shows the diagram of the pneumatic circuit

  than actuating the device according to the invention.

  If reference is first made to FIG.

  sees in 10 a molding frame consisting of four pa-

  vertical kings 12 and two frames, one upper 14 and the other lower 15, which delimit the side walls

  of the chassis. If one made parallel vertical cuts

  the axes respectively transverse and longitudinal

  nal of the frame, the peripheral walls would all have the shape of a C. This form is linked to the system of transfer of the chassis which is performed through sets of rollers 160 During the approach path of the molding station, the chassis rests on these rollers by the underside of the upper frame 14, and is pushed on these rollers of

  transfer by appropriate pneumatically controlled arms.

  In the area of the molding station the walls

  have rollers arranged along a path situated at a lower level, so that the chassis carries

  on these with the underside of its inferior frame

  15 (figure 2) and can execute the movements of

  vertical translation necessary to perform the operations

  molding and demolding rations. will

further.

  At the molding station is arranged a tray 18 des-

  able to support the model; this plate 18 comprises two vertical studs 20 intended to engage in corresponding holes 22 provided for this purpose in the frames 14

and 15 of the frame! 0.

  The plate 18 is rigidly secured to the rod 24 of a piston 26 sliding in a cylinder cylinder -4-

  single-acting pneumatics (Figure 5) and follows the movements

  ments of this rod, guided and supported by the body 29.

  At the inner walls of the vertical plates 30 (FIG. 2) are fixed four cylinders 32 of small dimensions provided with pistons 34 and whose role will be explained in detail by

following (Figures 1, 4 and 5).

  A ramp 38, rigidly fixed to the plate 18 by means of an arm 36, serves to actuate by its vertical movement appropriate valves which control

  the successive phases of the molding and demolding cycle

  ge, as will be indicated in more detail during

  the description of the pneumatic control system schematic

  than. Refer to Figures 3 and 4 for

  the description of one of the four small cylinders 32.

  In the upper part of each cylinder 32 is

  arranged a piston 34 with hydraulic control. The trans-producing oil

  putting the effort, contained in the tanks 102 and 108 (Figure 5) reaches the bottom of the cylinder

  through an orifice 42 (FIG. 3), a chamber circula-

  re 44, passages 46, an orifice 48, and finally the passage

  ge 50 (Figure 4). In its lower part, each cylinder comprises a shutter device 51 intended to prohibit the entry of the oil and thus to block the piston 34 in

a determined position.

  This device essentially comprises a piston

  52 which slides in the bore of a sleeve 54 and terminates

  with a frustoconical portion intended to apply

  be a seat 56 of complementary shape which controls the

  communication between passages 46 and 48.

  The opposite end of the piston 52 communicates with

  the air intake 60 connected to the pneumatic system which ac-

  the entire demoulding installation. In the cylinder 32 (Figure 3) there is also provided a passage 62 parallel to the axis to direct the oil to the part

  top of the cylinder through the orifice 64 in order to pro-

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  to evoke the downward stroke of the piston.

  The operation of the device will now be described.

  tif according to the invention with particular reference to the

  figure 5 on which, for the sake of clarity,

  felt that the elementsconcerning the operation of this device. To understand this, it is enough

  to know that the ducts 153 and 153 'represent the food

  compressed air and that the pipes

  149 and 151 are connected to the rest of the pneumatic circuit.

  than; that the pipe 151 is under pressure in the phase

  up of the model-holder plate 18 and connected to the

  during the descent phase of this plate, while the pipe 149 is on the contrary exhausted during the rise phase and under pressure during the

descent phase.

  When the chassis 10 reaches the molding station, it is able to send a pneumatic switching signal to a pre-actuation distributor 150, via the line 151. This distributor 150, by its

  switching, communicates the general line of

  compressed air with the pilot member of a valve

  154 to switch it, which feeds the cylinder 25 with compressed air which thus pushes the

  the piston 26, the model-holder plate 18 and the casing

sis 10 superimposed on it,

  When the plateau 18, during its ascending course,

  dante, has reached a level at which its ramp 38 switches the valve 166, a pneumatic switching signal is sent to the valve 100 connected to the network

  main power supply 153 '; therefore, air com

  the pump reaches reservoir 102, discharging the oil contained in line 104 and then into the cylinder

  32, which pushes up the pistons 34 of demolding

  ge. Once arrived in its extreme position at the end

  of its upward movement, the model-holder plate 18

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  - 6 - is still in its ramp 38, the valve 168 which is

  switched and sends the air from the

  151 to the pilot member of the valve 170, which ensures

switching it.

  The air reaches the double-acting cylinder 173, whose piston 175 is then pushed to the left, looking at the diagram of FIG. 5, which actuates the mechanical locking lock 177 of the piston rod 24.

  26. In this way, the chassis 10 is kept positive-

  in its loading and settlement position of the

  sand for the molding operation.

  At the end of this last operation, the descent phase begins; the valve 168 is exhausted

  through the conduct 151 which is also, and the dis-

  tributor 170 is switched through the conduct 149 which

  comes active to supply compressed air to the cylinder 173, which pushes the piston 175 to the right

  (Figure 5) and ensures the unlocking of the piston 26.

  At the end of its stroke, the piston 175 switches the valve 144 and, consequently, the air

  flows from the pipe 149 to the steering member of the dis-

  tributor 150 which, by switching, Chet the valve 154 to the exhaust. Since the piston 26 is no longer supplied with compressed air, this piston, with the chassis 10

  and the model-holder plate 18, gravity-fed its

  going down. At the beginning of this downward movement, the

  ramp 38 leaves the valve 166 whose switching occurs

  kills and ensures the withdrawal of air in the tank 102.

  Downhill, the frame 10 prepd support on the release pistons 34 which are automatically set to optimal level, so as to provide a safe support for

the chassis.

  After a stroke of about 100 mm, the ramp 38 actuates the valve 180 which sends a pneumatic signal to the switching valve 182. The compressed air arrives in

  entry 60 (Figure 4) through the supply line.

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  106 to actuate the device 51 for stopping the oil intake. The small piston 52 (Figure 4) is biased against the seat 56 and thus closes the oil inlet in the cylinder 32, this has the effect of immobilizing the frame which is supported by four "cushions" of oil formed between the small locking piston 52 and the support piston 34

(Figure 4).

  The model-holder plate 18, however, continues its

  race, thus ensuring the execution of the

  molding under the most favorable conditions, without

  than tearing at the weak points of the molded piece.

  When the plate has reached its bottom dead point, the ramp 38 has left the pilot lever of the valve 180, so that the valve 182 is switched again on the exhaust, thus restoring the locking device

  oil 51 in its state of rest.

  In this position, the valve 164 is switched, which in turn switches the

  valve 110, so as to supply compressed air,

  from line 153, the reservoir 108, the action oil

  therefore, the small pistons 34 of the cylinders 32, which are biased downwards, so that the chassis

  at the end of the downhill race may

  right on the conveyor rollers and move away from

following the molding station.

Claims (3)

  1. - Release device for foundry molding installations and machines, of the type comprising a system for transferring the chassis by rollers, a model-holder plate at the molding and demoulding station, placed   below said frame and can be coupled to that   ci to make it perform movements of upward and downward vertical translation, this device being characterized in that it comprises a bearing face formed by elements which are automatically placed in a common support plane and which, at during the demolding process, replace the usual support plan of the   frame formed by the transfer rollers.   2. - Release device according to the claim   1, characterized in that said elements which form   the support plane consists of four hydraulic cylinders whose pistons are actuated so as to form points of support which automatically adapt to the chassis during the descent phase thereof,   locking means of these pistons being provided to stop   per the movement of this chassis with respect to the model-holder which, while continuing its descending run,   performs the demolding operation.   3. - Demoulding device according to one or the other   Claims 1 or 2, characterized in that the   means for locking the pistons in a determined position are constituted by a piston sliding in a socket   which is an integral part of each of the hydraulic cylinders   the latter piston having an end whose shape   allows it, when activated, to act as   shutter of the passage of the feed oil of called cylinders. 0 00 0 0 0