Controlling device for coil spring bending tool and controlling method therof

A controlling device comprising:

• at least two coil spring bending tools for bending a spring wire;
• at least two controlling apparatuses being connected with the at least two coil spring bending tools and being mounted on an assembly platform;
• a lifting apparatus for controlling a height displacement of the assembly platform;
• a motor providing power to the at least two controlling apparatuses and the lifting apparatus respectively;
• and
• a control module and a testing module connected with the motor, wherein:
• the at least two controlling apparatuses control displacements of the at least two coil spring bending tools;
• the displacements of the at least two coil spring bending tools are adjusted according to a radius of a coil spring, wherein the displacements of the at least two coil spring bending tools are equal to a changing of the radius of the coil spring;
• a center point of the coil spring is a virtual reference point;
• the height displacement is the assembly platform being moved by the at least two controlling apparatuses from the virtual reference point according to the changing of the radius of the coil spring;
• the height displacement is proportional to the changing of the radius of the coil spring;
• wherein:
• the testing module is configured to film the coil spring and calculates a difference value of the coil spring;
• the testing module is configured to output a correction signal to the control module according to the difference value;
• and
• the control module controls the displacement of the at least two coil spring bending tools and the height displacement of the assembly platform according to the correction signal in order to eliminate the difference value to a tolerance value.