Lifting hook bias angle monitoring apparatus, vertical hoisting monitoring apparatus and mobile crane

A vertical hoisting monitoring apparatus, applied to a mobile crane to monitor vertical hoisting of a single crane, vertical hoisting of main and auxiliary cranes and vertical hoisting of two cranes, comprising

• a platform plane, perpendicular to a lifting pulley block lifting force line and which is set on a mobile crane's hook assembly,
• wherein said lifting pulley block lifting force line through a hook is still perpendicular to said platform plane when said hook is under different bias angles or a lifting pulley block is raised and lowered, then a bi-axial inclination sensor to detect an angle of said platform plane relative to a horizontal plane is installed on said platform plane to detect a bias angle of said hook;
• alternatively, a movable pulley component and a hook component of said hook assembly are connected via two connecting plates located on both sides respectively, a first hinge shaft connecting said movable pulley component and said two connecting plates is disposed perpendicularly to an axis of a coaxial movable pulley, a second hinge shaft connecting said two connecting plates and said hook component is also disposed perpendicularly to said axis of coaxial movable pulley;
• moreover, with respect to an offset of an action point of a resultant force of a lifted load's gravity acting on said hook, said hook component is provided with a third hinge shaft parallel to said axis of coaxial movable pulley, then said hook component adjusts itself via said third hinge shaft and said second hinge shaft perpendicular to said axis of coaxial movable pulley;
• said bi-axial inclination sensor therefore is installed on said platform plane perpendicular to a lifting pulley block lifting force to detect a hook bias angle of said mobile crane, wherein said platform plane is on said two connecting plates;
• simultaneously, a set of remotely switchable three-channel wireless transmitter with a teleswitch mounted in a mobile crane operating chamber is arranged on said hook assembly to wirelessly transmit said hook bias angle's detected signals along bi-axial direction;
• besides, three sets of three switchable channel receiving-processing-display device of said hook bias angle, are installed in said operating chamber of said mobile crane;
• an orientation of said lifting hook bias angle is through said hook and perpendicular to an intersecting line of said platform plane and a horizontal plane, said orientation of said lifting hook bias angle is compelled and limited by a movement orientation of said hook and a lifted load's gravity, and said orientation of said lifting hook bias angle is changed by combined action of a relative deflection between axes of a fixed pulley and a movable pulley around said lifting pulley block lifting force line and a rotation of an axial line of said movable pulley around a vertical axis of a hook shank or a rotation of said hook around itself;
• the bias angle orientation of main and auxiliary cranes' hooks at a time of hoisting is determined by a link line between hook assemblies of the main and auxiliary cranes.