Quick release device of brake cylinder

1. A quick release device of a brake cylinder, comprising:

a first support iron plate;

a second support iron plate, installed with an interval from a side of the first support iron plate;

an iron plate ejector, installed between the first and second support iron plates, for expanding the relative distance between the first and second support iron plates;

a wrench assembly, sheathed on the iron plate ejector in a quick release status; and

at least one quick release portion, installed at a relative position of the iron plate ejector and the second support iron plate, so that the second support iron plate is in a quick release status, wherein the iron plate ejector has a first end surface and a second end surface, and the second end surface and the second support iron plate are detachably coupled to each other;

wherein the quick release portion is comprised of a magnetic steel installed at the second end surface and a magnetic guide portion installed at a relative position of the second support iron plate and the magnetic steel; wherein the magnetic guide portion is in form of a guide slot capable of embedding the magnetic steel and the magnetic guide portion with each other in a foolproof magnetic attraction manner;

wherein the magnetic guide portion has a side communicating with the second support iron plate to form a guide opening, and the guide opening and the magnetic guide portion have a height difference, so that the iron plate ejector can slide into the guide opening sideway and be positioned at the magnetic guide portion.