| Along with the advancement of modern industrial level,the mechanical system has been developing in the direction of complexity,speeding and super precision.Force-amplifying mechanism has become one of the key technologies for the precision machinery and precision instruments and other fields.Force-amplifying mechanism is extremely common used in mechanical engineering.However,there is still a lot of work to be done on issues such as the classification of force-amplifying units and the configuration design of force-amplifying mechanisms.This paper takes the basic force-amplifying unit as an object,and studies the configuration design of the force-amplifying mechanism and its application,including the following aspects:Firstly,based on the common characteristics of the basic mechanism units with force-amplifying effect,and proposes a basic force-amplifying mechanism's classification method in view of the length effect,angle effect and area effect.This paper summarizes the existing force-amplifying mechanism based on the engineering practice,and gets eleven basic force-amplifying units included in the three types of force-amplifying mechanism.It makes a comparative analysis for the characteristics,advantages and disadvantages of the basic force-amplifying units.And the expression for force gain coefficient and the applicable conditions of force amplification are given.Then,the theoretical design of topological configuration of series,parallel or hybrid force-amplifying mechanism is carried out.Taking the length effect and the angle effect as the object,this paper studies the types of force-amplifying mechanism that can be combined by these two kinds of effects.The configurational combination innovative design of force-amplifying mechanism structure by nine types of basic force amplification units,and two-stage series of force-amplifying mechanism type are obtained,and the configuration diagrams are carried out.Meanwhile,the structure of three-stage series force-amplifying mechanism is studied,and the configuration diagrams are obtained.Taking the length-angle-length three-stage series force-amplifying mechanism as an example,and configuration diagrams are given.The design method of configuration of force-amplifying mechanism is discussed through the innovative design of parallel combination.The advantages and disadvantages of series-parallel mechanism are compared and analyzed,and the compositional design method of hybrid force-amplifying mechanism is obtained through the combination innovation design of series and parallel force-amplifying mechanism units.I take examples with the topological type(4)of the 2S1 P of hybrid combination mode to study the topological types form,and gives the configuration diagrams.Finally,based on the typical configuration example of 3S3 P in topological configuration of hybrid force-amplifying mechanism,a precision pin mechanism which can be used in electronic equipment is designed.According to the design requirements of pin mechanism,the design of the mechanism and the scale design were carried out.The loop equation of the mechanism is listed by vector method.The Newton-Raphson method is used to solve the trigonometric function transcendental equations and the position analysis of the mechanism is completed.According to the theory of total differential to analysis position error of mechanism.And the statics of the mechanism is analyzed,and the force gain curve of the mechanism is obtained.Structural design of the overall model of the mechanism was carried out,and the dynamic simulation analysis was carried out to verify the correctness of the movement of the pin mechanism based on ABAQUS and ADAMS.The development and test of the prototype are carried out.On the whole,the designed scale,working performance,operation function,mechanism locking,positioning accuracy and so on all meet the design requirements of the prototype. |
PDF Full Text Request