Inverse Modeling And Movement Law Analysis Of The Bird’s Beak Knotter

Corrugated cardboard is still the most widely used packaging material,and its production volume is also increasing.The corrugated cardboard box production process involves the transfer of corrugated cardboard.Generally,the manufacturers manually bundle 20-30 sheets of cardboard before transporting them.This process requires a lot of manual knotting by hand,which is inefficient and has a poor working environment.Therefore,the development of an automatic rope knotting device with simple structure,convenient operation,high strapping quality and fast knotting speed is an urgent problem to be solved in the corrugated cardboard production line.The plastic rope bird’s beak knotter is the key mechanism to replace manual knotting.It is driven by a compound cam and can complete several actions such as feeding,winding,biting,knotting,cutting,etc.The plastic rope is wound around a corrugated cardboard pile to form a loose knot.At the same time,it has the advantages of low consumable costs,high knot efficiency,good quality,high success rate,and high degree of automation.Most of the research revolves around the C and D knotters used in the square grass baler.The two knotters have a large structure and a large baling force,but the research on the bird’s beak knotter Quite little.In order to prove the action principle and movement law of the bird’s beak knotter,so that it can be better used in corrugated cardboard stacking equipment,this article takes the bird’s beak knotter as the research object,and obtains the following conclusions:1)First scan the existing beak knotter by reverse engineering technology,process the point cloud data and then perform surface fitting to finally obtain an accurate threedimensional model.2)After obtaining the three-dimensional model of the beak knotter,the knotting action is divided into four main parts: rope feeding,beak swinging,beak turning,and rope unloading,and the corresponding branches are carried out After analyzing and understanding the specific knotting action of the bird’s beak knotter,the threedimensional model was imported into the virtual prototype software ADAMS for motion simulation.From the simulation results,the movement start and end time of each branch of the bird’s beak knotter within a period of 1s is obtained,and the movement cycle diagram of the bird’s beak knotter is obtained by analyzing the movement timing law.3)Then,using the theory of cam mechanism,we chose to redesign and optimize the contour with large impact in the cam of the beak knotter,and used virtual prototype simulation to compare it with the original cam contour data to prove that it has indeed improved accordingly.,Reduce the acceleration when the follower moves and reduce the impact vibration of the mechanism.4)Finally,the development and test of the prototype equipment were completed.The success rate of knotting is almost 100% under the correct placement of the cardboard and the correct direction of the rope,which proves that the optimized cam is capable of knotting.The knotter can be used in cardboard bundling work.Under the knotting principle and optimal knot formation conditions that have been proved in this paper,the bird’s beak knotter can also be applied to other devices through the design of coordinated actions,which has a relatively broad application prospect.From the theory to the three-dimensional model to the physical prototype,the timing sequence of the movement of the bird’s beak knotter was studied and analyzed,and the driving cam was optimized accordingly.Finally,it was applied to the binding of corrugated cardboard stacks.The feasibility and validity of the results.