RO122899B1 - Device for ejecting medium and large-sized workpieces produced by stamping - Google Patents

Abstract

The invention relates to a device for automatically ejecting medium and large-sized workpieces from cutting and punching dies. According to the invention, the device comprises two parts: a fixed part formed of two supports (1) whereon a main gear rack (2) is rigidly fixed, and two bearings (3), mounted on a frame, in front of a press, said bearings supporting some raceways (4), and a mobile part, mounted on the press ram, comprising a metal framework (5) in a welded construction whereon there are mounted two journals (6) supporting a shaft (7), said shaft (7) having, at one end, two toothed wheels (8 and 9), a driving wheel and respectively a driven wheel, and having at the other end another driven toothed wheel, the framework (5) being also provided with two guide columns (10), whereon a mobile carriage (11) moves, and has two gear racks (12) fixed on lateral sides, said gear racks (12) being driven in a rectilinear motion by the main gear rack (2) by means of the toothed wheels (9), while the lower part is provided with a tray (19) for taking over the workpiece.

Description

The invention relates to a device for automatically evacuating medium and large pieces, from the cutting or punching sheets to which the cutting punch is down, and the mold is mounted on the movable part of the press.

It is known that in the absence of a system for removing the part from the working area of the stamp, the processed piece falls on the surface of the blank, being manually picked up by the operator, which often leads to accidents.

Other methods of evacuating parts, such as by blowing with a strong jet of compressed air (for relatively small parts) or by re-introducing the pieces into the strip, until the exit from the working area of the mold and separation are known in the literature. in a non-hazardous area.

Also in the specialized literature are known dump dumpers for the disposal of the pieces, respectively, the waste from the stamp. The thrower is intended to evacuate the parts from the top of the die.

It is mounted on the press, behind the ram, between the uprights of the bat.

Through an articulated lever system, the receiving device enters the work area of the stamp, when the press ram rises, takes the piece and exits it behind the press. The lever system is driven by the eccentric press.

Another system found in the specialty literature is the screw thrower system. In this system, when raising the ram, an oscillating wedge rotates a lever that moves a thrower, which, in turn, eliminates the previously processed piece.

The disadvantage of these systems is that they, in the vast majority, are embedded in the construction of the records, which complicates and expensive the tool.

The disadvantage is that adjusting, depending on the press travel, the system of levers (driven by the eccentric of the press) that controls the access of the lifting and lifting parts, is very difficult, with the risk, in case of improper adjustment or adjustment. an accidental disturbance, caused by the vibrations in the system, that the tilt remains in the work area of the press when the ram descends, damaging the tool and the entire exhaust system.

The technical problem solved by the invention is the realization of a mechanical assembly of simple and risk-free automatic disposal of the parts (waste) in the working area of the press, thus favoring their palletizing or containerizing, which can be mounted on any mechanical press or hydraulics with uprights and work synchronously with it, ensuring a correct removal, by a simple adjustment and in a very short time.

The device according to the invention, for the evacuation of the pieces of medium and large dimensions, obtained by stamping, solves this technical problem, in that it is composed of a fixed and a movable part. The fixed part, mounted on the press bar, is composed of two supports on which a main rack is rigidly fixed and two supports that support the rolling path on which the rollers of a tilting element that remove the stamped part from the press work area move.

The movable part of the stroller is mounted on the ram ram and is composed of a frame in welded construction, on which are fixed two guide columns on which a movable trolley slides, moving forward and backward, for taking and removing the sealed parts. , set in motion by a system of racks and gears. The gear wheel mounted on the trolley, which engages with the main rack rigidly mounted on the press rod, is interchangeable, the number of its teeth being calculated according to the race of the press and the travel of the moving trolley, which causes that for changing the strokes of the trolley to change only one gear (interchangeable-wheel).

RO 122899 Β1

The following advantages are obtained by applying the invention: 1

- increasing labor productivity;

- the possibility of serving any type of press (including those with C-bar, by 3 adapting a support for fixing the fixed rack), at very high tactics;

- reducing production costs by reducing ancillary times.5

From a social point of view, the advantages consist in improving the working and living conditions of the operators, by preventing accidents in the work process.7 below, an example of the invention is given, in connection with fig. 1 ... 3, which represents: 9

FIG. 1, side view of the device for removing medium and large pieces, obtained by stamping.11

FIG. 2, front view of the device for removing the medium and large pieces, obtained by stamping.13

FIG. 3, the main kinematic chain for moving the trolley.

The device for evacuating medium and large pieces obtained by 15 stamping consists of two main parts, one fixed and the other movable.

The fixed part consists of two screw brackets 1, on which is fixed rigidly 17 the main rack 2 and of two supports 3, mounted on the rail in front of the press, which support the tread 4.19

The movable part is composed of a frame 5 in welded construction, in solidarity with the press ram. On this frame 5 are mounted two bearings 6 that support the shaft 7, which 21 at one end ends with two gear wheels, one driver 8 and one driven 9, and at the other end, with a gear wheel identical to the driven wheel 9. 2. 3

The frame 5 is also provided with two guide columns 10, on which a mobile trolley 11 moves, which has fixed on the sides two racks 12, and in the lower 25, the pick up tray 19.

Also on frame 5 is mounted, by means of a joint 13, a tilting element 14, 27 provided with rollers 15 that travel on the treads 4.

Also through a joint 16, are assembled, on frame 5, three stops 17 of a special shape 29, which at the attacking side are provided with a slope, and at the opposite side has a spur 18 for hanging. 31

At the initial position, the press ram is in the up position (at PMS), and the moving trolley

11, together with the pick-up tray of the piece 19, is in the pick-up area of the removed pieces 33 (below the top of the mold). When the press ram descends from PMS to PMI, the driving gear 8, which is engaged with the main rack 2, rotates the shaft 35 7, together with the driven gear wheels 9. The driven gear wheels 9 are engaged with the rack 12 of the mobile trolley. 11 and as a result of the rotation of the driven gears 9, 37 the movable trolley 11 moves out of the working area of the ram, having in the pick up tray of the piece 19 the previously processed piece 20.39

The previously processed piece 20, located in the pick-up tray of the piece 19, in its retraction movement raises the 3 stops 17.41

On the last part of the descent race of the ram, the stamping operation takes place, after which the ram starts to climb from PMI to PMS.43 In the stamping process, the piece (waste) stays inside the mold and withdraws, together with it, towards PMS, when to be eliminated.45

When climbing, the driving gear wheel 8 rotates in the opposite direction as it goes down and through the kinematic chain formed by the main rack 2, the driving gear wheel 47, the driving gear wheels 9 and the racks 12, the mobile trolley 11 moves under the sheet, to take over a new piece. 49

EN 122899 Β1 on its Return Road, the previously taken track 20, located in the tray 19 of the mobile trolley 11, meets the spindles for some hooks 18, of the stops 17, and is thrown on the tilting element 14, which at this moment has an inclined position , so that the piece 20 slides gravitationally and falls into a container or pallet.

When the ram gets close to PMS, the ram pushes into the ram pushing the piece (the waste) in the mold (stamp), which falls into the pick-up tray of piece 19 and the cycle resumes.

In the case of changing the press stroke and the travel of the moving trolley, the only element that is modified is the driving gear wheel 8, which has a diameter of division equal to

where:

- D _d = the splitting diameter of the driving gear 8 (the gear wheel with the main rack 2);

- c = press stroke [mm];

- c, = travel of mobile trolley 11 [mm];

- D _d1 = diameter of the driven gear wheels 9 (which engages with rack 12) of the moving trolley [mm].

Knowing D _d one can calculate the number of teeth z of the driving wheel 8, by the formula _ D _d ci = - or Z = - Z _t , where Z ₄ is the number of teeth of the driven wheel 9.

m Y

After the driving gear wheel 8 is replaced, the rack 2 moves until they engage, and then the screws of the brackets 1 are tightened in that position.

All other elements remain the same, including the driven gears 9 and the racks 2 and 12.

Claims (1)

Claim 1 Device for evacuating medium and large pieces, obtained by stamping, 3 having a flat horizontal displacement part, whose positioning under the upper part of the mold and its lateral removal is achieved by means of an assembly 5 formed by some racks and a sprocket, characterized in that it is composed of a fixed part, which is mounted on the press rod, composed of two supports 7 (1) on which the main rack (2) and two supports (3) are fixed rigidly which support treads (4), which move some rollers (15) of a tilting element (14), and 9 a movable part which is mounted on the ram ram and which is composed of a frame (5), in welded construction, on which two guide columns (10) are fixed, on which 11 a mobile trolley (11) moves, on the sides of which are provided two racks (12) that engage with two wheels gears (9), fixed by means of feathers on a shaft (7), which at one end of 13 ends with another gear (8), which is permanently engaged with the main rack (2) and which in its movement on upright, in solidarity with the press ram, 15 moves the movable trolley (11) under the mold, by means of cogwheels (9) and a rack (12), to retrieve the part removed from the stamping tool, moving during 17 to which the piece taken from the previous cycle is stopped by some spurs (18) of some stops (17) and transferred to the tilting element (14), where it falls into a container or outside the work area 19 of the press.