The invention relates to the technical field of curved arm connecting rods, in particular to a
crank connecting rod automatic swelling and breaking device. The
crank connecting rod automatic swellingand breaking device includes a working table,
cracking dies, a top pressing plate, a
cracking wedge,ejection rods and a
cam mechanism, wherein the working table is further provided with through holes;the working table is arranged on the
cam mechanism, a plurality of sets of the
cracking dies are uniformly fixed to the working table in the circumferential direction, the through holes are formed inthe bottoms of the cracking dies, the top pressing plate is arranged above the working table, the bottom of the top pressing plate is close to the tops of the cracking dies, the ejection rods are movably inserted into the through holes, the cracking wedges are fixed to the tops of the ejection rods, and the
cam mechanism is connected to the ground. According to the
crank connecting rod automaticswelling and breaking device, automatic swelling and breaking of a crank connecting rod are realized, the structure is simple, expensive precision instruments are not needed, the swelling and breakingeffect is controllable, material loss is reduced, material
confusion is avoided, and automatic sorting is realized.