The Study On Dynamic Characteristics Of Preforming System Of Aseptic Brick Machine

The world beverage market is huge and increasing year by year.The beverage packaging industry also thrives with the growth of the market.Nowadays packaging machinery is a necessity for beverage packaging,aseptic brick packing machine is the most common packaging machinery.With the advent of the intelligent age,aseptic brick packing machine has begun to develop towards high speed,high precision and high intelligence.The pre forming system of the aseptic brick machine has become an important system affecting the packaging speed because of its relatively complex structure,short working procedure time and large working range,which has been paid more and more attention.In the process of aseptic brick packing machine,the vibration of the pre forming mechanism will have some influence on the stability and packing accuracy of the mechanism.With the acceleration of packaging speed,this effect will be bigger and bigger.In view of the problem that the preforming system is not stable in the working process and the packing precision is not high in the working process,the paper takes the JX-2000 automatic aseptic carton packer as the research foundation,and analyzes the dynamic analysis of the pre forming mechanism of the key part of the packaging machine,and studies its Dynamic response during working time..First of all,the technological process of aseptic brick packing machine is analyzed,and the structure and working principle of the preforming system studied in detail are introduced in detail.Then the preforming system is analyzed,and the main parts which affect the efficiency of the pre forming system and the accuracy of the packaging are determined.At the same time,the work task is clearly defined,which has the guiding significance for the following three chapters.Secondly,after considering the inertia force,the centripetal force,the Coriolis force,the relative inertia force which are introduced by the dynamic influence and the displacement velocity damping on the transverse vibration of the beam,the vibration differential equation of the double moving mass and the simple supported beam coupling system is established,and the corresponding physical model is set up,and the ANSYS Workbench is used to get into the system.Transient dynamic analysis is carried out,and the results are verified.By comparing the vibration responses of different periods under different parameters,the following conclusions are drawn:when the horizontal seal performs sinusoidal reciprocating motion,the midspan deflection of the supporting rod is sinusoidal,and it starts to fluctuate at the beginning,and then gradually stabilizes.When the quality of the transversal packer is changed,the larger the mass,the larger the balance position displacement and the greater the amplitude;At the initial position of?₂-?₁=value,the smaller the ₁?,the smaller the balance position of the dynamic response of the rod,the larger the amplitude.When?₁+?₂=L,with the increase of ₁?,the equilibrium position of the dynamic response gradually increases and the amplitude decreases;When the stroke is different,the balance position of the dynamic response of the support rod is small,the longer the stroke is,the greater the amplitude,and the change of the driving cycle of the transversal packer has little influence on the balance position and amplitude of the dynamic response.Then,this chapter studies the displacement of the support rod with the contact hole of the preformed part when the support rod is subjected to the gravity and the inertia force of the hanging basket.A mathematical model is established to calculate the displacement of the center hole of the supporting rod under the action of bending force and torque.By establishing the physical model,the motion process of the lower basket is solved by using Adams,and the displacement of the supporting rod hole under the action of bending force and torque is calculated by using ANSYS Workbench.It is proved that the result of the acceleration of the lower basket in Adams is the same as that of the mathematical model,indicating that the mathematical model is accurate.The result of the physical model in Workbench is an interval,and the displacement of the mathematical model is verified between the results of the physical model.Then,at different working frequencies,we simulate the center of holes under different working frequencies under different working frequencies,and find the working frequency range by comparing with the industry standard.The working frequency is no more than 10Hz.The bending strength is checked and torsional strength is checked,and the Matlab software is used to solve the problem according to the optimization design idea,and the internal working life penalty method is used to solve the problem.Finally,the minimum working period 0.56s of the mechanism is determined.Then ANSYS Workbench is used to analyze the security of the support bar under this working cycle,and its safety is determined.Finally,the natural frequency of the hanging basket on the preformed mechanism is studied.Modal analysis is carried out.The results show that the actual working frequency is far away from the natural frequency of the hanging basket,and the resonance phenomenon will not occur.Therefore,the supporting rod on the preforming mechanism will not cause larger displacement due to resonance.