Research On Design Method Of Knotter Based On Rigid-flexible Contact Dynamics And Knotting Test

For knotter structure improvement and parameter adjustment in the design stage it is difficult to judge the merits and increase manufacturing investment risk problem, presents a design virtual knotting method based on the dynamics of rigid flexible contact. The correctness of the design of the double toothed disc drive and the knot is verified by the test bench of the design of the performance test and the reliability test bench. The main research contents of this paper include:1) Virtual knotting method and research of knotter based on rigid-flexible contact dynamicsTo double gear disc driving knotter knotter virtual knot Adams prototype model as the prototype, using ADAMS Bushing connection is established for large deformation dynamic model of flexible cords through the ropes and rigid component is arranged between the contact constraints and loads applied to achieve a complete knotter virtual knot tying simulation process, the rope under tension into node of rigid flexible interaction mechanics behavior. Using the virtual knot method analysis of the knotter and rope clamping disc action sequence difference Phi changes rally nodes into the influence of and to determine the knotter parameters matching whether a node or a node to the goodness to visually verify the role and analysis that whenα=98°、φ=12.5°±5 degrees plus or minus 5 can realize the virtual knot, show that the small fluted disc on the incomplete bevel gear and the big gear wheel incomplete cone gear installation phase difference allows changes in 42.5°±5°, angle of approximately half a tooth.2) Design and test of the performance test and reliability test bench for knotterIn view of the performance test and fatigue test system of the lack of knot tying in the domestic, a test bed for continuous knot tying is proposed: Through design and installation in the cross slide simulation bale of resilience characteristics of pull rope device, control the cross slide pull rope device according to the rectangular trajectory, pull rope device of pulling rope motion simulation bale extrusion movement of the ropes. After the end of the pull rope, the control system sends out the instruction to the electromagnetic clutch engagement, and the speed regulating motor power is transmitted to the main shaft of the knot tying device to drive the knot tying device. Test bench control system to achieve the cycle of the pull rope- tying process, and test the process of tying the rope tension, spindle torque and spindle rotation. According to the scheme, the key components of the test bench are designed and calculated, and the three-dimensional model of the test bench is set up under the Solid Works. According to the test bench control flow, the control system of the test bench is designed, and the measurement and control program of the system is designed by using Labview. By outsourcing parts and manufacturing, installation and commissioning completed the test station of the mechanical and electrical integration system. Test results show that the test bench for knotting efficiency is 3 / min, the cumulative knotted 6000 equipment running normal.3) Verification test of virtual knotting and timing comparison test of knotterDisk drive began to bite, collected in the installation disk drive, were imported from Germany knotter bidentate knotter knotter performance test and reliability test bench two knotter node process the action corresponding to the spindle rotation, the movement comprises a clamping rope started, dial rope movement began, sending rope end, wrapping button start, circle the buckle 90° around the buckle 180°, dial string to the maximum stroke, circle the buckle 270°, pliers, cut the rope, tripping over and rope dialing disc returned to its original position, the two kinds of knotter action sequence diagram, verify the bidentate knotter structure parameters matching is correct, the clamping rope and rope cutting action is superior to that of the imported knotter, the ratio of 100%.Through sparring node prototype into motion and virtual knot, the simulation results are compared and analyzed. The results show that the virtual knot and the actual tie the course is very consistent, to verify the correctness of the bundle of rope dynamics model and rigid flexible contact dynamics simulation model, as evaluation knotter design quality, ensuring the knotter once manufacturing success of effective methods. According to the measured the rope tension, set up virtual rope model tension for 150 N virtual knot spindle torque variation curve and measured spindle torque variation curve is consistent, the maximum error 5Nm, verify that the virtual knot dynamics analysis results can be used to guide the knotter load analysis.