A design method for a knife-shaped cam curve of a main-auxiliary type constant-force spring support hanger

The invention discloses a design method for a knife-shaped cam curve of a main-auxiliary type constant-force spring support hanger, and belongs to the technical field of main-auxiliary type constant-force spring support hangers. The method is characterized by comprising the following steps: step 1001, determining an energy transfer relation in a movement process; Step 1002, determining the springforce of the main spring and the auxiliary spring; 1003, establishing a differential equation of the rotation angle of the knife-shaped cam and the vertical displacement of the load tube; Step 1004, establishing a corresponding elliptic equation according to the step 1003; And step 1005, establishing a design equation of the profile curve of the knife-shaped cam of the support hanger. The invention discloses a design method for a knife-shaped cam curve of a main-auxiliary type constant-force spring support hanger. According to the energy change of the constant-force spring support hanger in the moving process, the kni