SU401092A1 - Grab device for feeding blanks into the working area of the press - Google Patents

Description

one

The invention relates to the field of automation of stamping production and is used to feed blanks on multi-position sheet-stamping presses.

Grabbing devices are known that contain grapples placed on both sides of the supplied blanks and are brought into reciprocating motion along the feed axis of the blanks by means of a longitudinal displacement unit made in the form of a planetary mechanism consisting of a rotating press drive with a satellite running around a stationary central wheel and bearing crankshaft pin associated with rulers by means of a transmission mechanism. Rulers receive oppositely directed reciprocating movements perpendicular to the direction of supply of blanks from the same drive through the cam-lever mechanism of the node of transverse movement of the rulers, the driving link of which is installed on a common drive shaft with the said carrier.

However, in known devices it is impossible to carry out readjustment of the cyclogram, which is usually calculated based on the maximum parameters of the printed products. When stamping products with other parameters of the cyclogram, the operation of the device becomes irrational due to the excessive duration of the cycle intervals spent on the stand of the clamshell and their idling.

The purpose of the invention is to enable the readjustment of the cyclogram of its work, depending on the parameters of the stamped products.

This is achieved by the fact that in the proposed device the transmission mechanism connecting the longitudinal movement unit with the clamshell rulers is made in the form of a curvature-rod mechanism with an adjustable crank radius, the crank finger of its planetary mechanism is installed with the possibility of adjustment movement along the satellite radius, and the driving link of the node the transverse movement of the grab bars is made in the form of a set of disk cams coaxially mounted on the said drive shaft with the possibility of adjusting move along the axis of the latter.

FIG. 1 shows a general view of a multi-position automatic press with the proposed feeding device; pas figs. 2 is a section along A-A in FIG. one; in fig. 3 is a view along arrow B in FIG. one; pas figs. 4 shows a section along BB in FIG. 3; in fig. 5 is a section along G ‑ Y in FIG. one; in fig. 6 is a section along d-d in FIG. one; on

FIG. 7 — satellite finger motion paths; in fig. 8 - cyclograms of the joint operation of the device and the press. On the frame of the press machine, at the level of the slide, the shaft 2 of the automatic feed drive is mounted, which is connected to the main shaft by gear 3. On the shaft 2, there is a cam block 4 and a carrier 5 with a satellite wheel 6 (see Fig. 4). The cam block (see FIG. 6) comprises a hub 7 movable along the shaft; the sleeve 8, which is connected to the hub by means of gearing, and the inlet of the cams 9, which are sitting on the sleeve fixedly on the spool 10. The cams are fastened to the hub 7 by means of studs. The cam block moves on the shaft 12 on the shaft and is fixed in a certain position nut 13. The cams contact the roller of the beam push rod 14 fixedly mounted on the rocking shaft 15. The pusher 14 is constantly pressed by the spring 16 to one of the cams 9. The pusher 14 and the lever 17 are connected to the clamshell 18. The satellite 6 (see Fig. 4) found It engages with a fixed gear wheel 19 mounted on a press frame. The outer end of the satellite ends with a flange 20, on which a pin 21 is attached. The position of the finger on the satellite 6 is fixed and fixed by an adjusting screw 22. The finger is connected to the connecting rod 23, the opposite end of which is connected to the rail 24. The rake is coupled to the gear 25 of the shaft 26, on the opposite end the end of which has a crank 27 connected to the carriage 28 by means of a connecting rod 29 (see Fig. 2). The clamshell machine system works as follows. - When the main shaft rotates through a gear transmission, the automatic feed drive shaft rotates synchronously. The cam block mounted on it, the carrier with the satellite and the finger 21 are the driving elements of the grab rulers respectively in the transverse (from the cams) and in the longitudinal (from the finger 21) directions. The movement from the cams to the clamshell is transmitted through the roller pusher 14 and the lever 17 fixedly mounted on the rocking shaft 15. The movement from the finger 21 to the carriage of the clamshell is transmitted by means of a connecting rod 23, rack and pinion gear (rail 24, gear 25 and shaft 26) and crank mechanism (crank 27 and connecting rod 29). The adjustment of the cycle intervals of the device and the selection of a rational sequence diagram is carried out as follows. The intervals of the longitudinal movement cycle of the leeks (the time of movement and the time of stay in extreme positions) are set by moving the finger 21 on the satellite and adjusting the radius of the crank 27. When the finger 21 is displaced relative to the center of rotation of the satellites 6, its trajectories change for each fixed position (see Fig. 7) from a circle (curve a) to a square rounded at the corners (curve e). Intermediate curves b, c, d tl. etc., differ from the curves a and e in the size of the straight sections of the finger trajectory 21. The values of the straight sections change (see Fig. 8) from O (curve a) to the maximum value (curve e). The horizontal snapshots of the indicated curves cause, during the operation of the press, the stand of the rulers in their extreme longitudinal positions, on the rest of the trajectory of the finger 21, a longitudinal (forward and reverse) stroke is provided. The described trajectories are possible only with a certain ratio of wheels 6 and 19 and the magnitude of the displacement of nap 21 relative to the center of rotation of the satellite. In this case, the ratio of the wheels 6 and 19 is 1: 4, and the offset value is O-0.4 from the satellite radius. Thus, when the finger position on the satellite changes, the intervals of the grapple's longitudinal cycle are changed. However, this slightly changes the magnitude of the stroke of the grab, which must remain constant in all cases. In order to ensure the constancy of the feed pitch when adjusting the cycle on the crank 27, the axis of the eccentric axis (not shown) is set. which can be rotated relative to the pins and locked in position. The cycle intervals of the lateral movement of the rulers are set by cams 9 of a different profile. The cam block is moved along the shaft with the pusher retracted (the pusher retraction mechanism is not shown). The cam profiles differ from each other by the height and motion intervals and phase displacement (phase displacement is the time or angle counted from the extreme position of the tool before the beginning of the transverse stroke of the rulers). Therefore, each cam can perform only one of the variants of the transverse stroke of the rulers. In the presence of various variants of the cycle of the longitudinal and lateral course of the grab, their combination cannot be arbitrary. FIG. 8 shows an approximate cyclogram of an automaton with a more or less rational combination of tool cycle intervals (curve I) and rulers (curves P and 111). The combination of cycle intervals P, a and P1, and provide the most smooth and quiet operation of the grab system, since the relative time of the intervals of motion in this variant is the longest (1.3-1.5 times longer than usual), which allows to increase the performance of the automaton and its reliability, the combination of cycle intervals P, s and 1P, s provides a deeper stretch, i.e. it has more technological possibilities, although the kinematic characteristics of this variant are somewhat worse than

in the first embodiment, due to a decrease in the relative time of movement of the rulers.

Combination II, at and III, is an intermediate option.

Of course, other combinations are possible, both qualitatively and quantitatively. Option A is most appropriate when stamping low and flat parts such as cages to bearings; option a when stamping parts of medium size; option with when stamping high and overall parts.

Subject invention

Grab device for supplying blanks to the working area of the press, containing, its placement, grappling rulers on both sides of the supplied blanks, driven in reciprocating motion in the direction of the blanks supply by means of a longitudinal movement unit, made in the form of a planetary mechanism; from vrash, ayush, egos from press drive drove with satellite, run-in, imc around fixed central wheel and nesush, crank

a finger connected by means of a transmission mechanism with rulers receiving oppositely directed reciprocating movements perpendicular to the feed direction of the blanks from the same drive through the cam-lever mechanism of the transverse displacement unit, the leading link of which is mounted on a common drive shaft with the said carrier, characterized by by that

that, in order to provide the possibility of retooling the cyclogram of its operation depending on the parameters of the products being stamped, the transmission mechanism connecting the longitudinal movement unit with the clamshell rulers is made in the form of a crank mechanism with an adjustable crank radius, the crank finger of the planetary mechanism of the same node is installed with the possibility of adjusting the movement along the satellite radius, and the leading link of the node of the transverse movement of the clamshell lines is made in the form of a set of disk cams with different shapes of their working profiles coaxially mounted on the said drive

shaft with the possibility of adjusting the movement along the axis of the latter.

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