Equipment, system and method for bending deflection detection and safety control of suspension arm, and crane

The invention discloses equipment, a system and a method for bending deflection detection and safety control of a suspension arm, and a crane. The suspension arm is a sleeved telescopic arm, comprises a plurality of arm sections and is connected with a rotary table; detection equipment comprises a first receiving device for receiving a first imaging position and a second imaging position of a light source on a to-be-detected arm section in images acquired by a first image acquisition device and a second image acquisition before the suspension arm is suspended, as well as a third imaging position and a fourth imaging position of the light source in images acquired by the first image acquisition device and the second image acquisition when the suspension arm is suspended; the first image acquisition device and the second image acquisition are arranged on two sides of the rotary table; the detection equipment further comprises a calculating device for calculating the deflection of the to-be-detected arm section according to the pre-stored distance between the prisms of the first second image acquisition and the second image acquisition and an imaging plate, the included angle between the to-be-detected arm section and the rotary table and the distance between the front end of the to-be-detected arm section and the initial end of the suspension arm before the suspension arm is suspended, the distance between the first image acquisition device and the second image acquisition, and the first, the second, the third and the fourth imaging positions. Therefore, the bending deflection of the suspension arm can be detected promptly to obtain a deflection measured value with high reliability.