PIN INSERTION AND EXTRACTION MECHANISM, INSERTED PIN TYPE TELESCOPIC BOOM AND CRANE

摘要

Disclosed are a pin insertion and extraction mechanism, an inserted pin type telescopic boom and a crane. The pin insertion and extraction mechanism comprises a telescopic oil cylinder provided in a telescopic boom (100), wherein the movable end of the telescopic oil cylinder is provided with a cylinder end (1), and two sides of the cylinder end (1) are provided with a cylinder pin (2) for locking with the telescopic boom (100). The pin insertion and extraction mechanism further comprises: a boom pin (5) slideably provided on a side wall of the telescopic boom (100), and used for locking to another telescopic boom when sliding to extend; a return mechanism (6) for retaining the boom pin (5) in an extended state; and a rocker lever (3) hinged by means of a fixed shaft to a side wall of the telescopic boom (100), one end of the lever being connected to the boom pin (5) and the other end being able to be pushed by the cylinder pin (2). In the pin insertion and extraction mechanism, providing a boom pin, a return mechanism and a rocker lever providing lever action on the two side walls at the tail of the telescopic boom means that when an ejector rod of the cylinder pin is extended, the boom pin is retracted and when the ejector rod of the cylinder pin is retracted, the boom pin is extended, thereby switching between the cylinder pin locked state and the boom pin locked state. The mechanism not only has a simple structure, is convenient to set up and has fewer essential components, but also reduces the machining complexity of components such as the cylinder head, etc. as well as reducing the installation accuracy of components such as the boom pin, etc.