| Vibration, turning and slippage of the metal conveyor belt is the main reason forthe movement failure of the spiral freezer, using traditional methods to solve themechanical failure of spiral freezer conveyor needs repeated debugging by workers,which is low efficiency and high labor intensity. This process is heavily relies on thetechnical level and labor skills of workers simultaneously. Without changing thestructure of the spiral freezer and metal conveyor, the metal conveyor belt can beeffectively controlled by analyzing the tension characteristics of it.Using Pro/E software for modeling simulation model of metal conveyor belt,and importing it to ANSYS structural analysis software for static analysis. Flexiblemetal conveyor mesh belt in the frozen machine is collapsible and scalable, theflexible multi-body dynamics model of the belt is analyzed in connection with thesecharacteristics. To set up virtual prototype model of metal mesh belts and drums, thebushing force of RecurDyn software was adopted on the principle of friction drive.And the multi-body dynamics-based simulation strategy was putted forwardin the model. The influence of pull and property of the three layers metal mesh beltson system stability was discussed. In the same way, using bushings modules of theRecurDyn software, build five metal bands and drum system virtual prototype. Theinfluence of pulls and pull differentials of metal mesh belts on slip ratios of frictiondrive was discussed. The influence of pulls on stability of friction drive andcontact force of frictional pairs was researched too.For the three layers metal conveyor belt model, the results show that contact forceexist a triangular wave curve for start-up. The start-up time is3s. When the systemis in steady operation, the contact force is increases in layers from inlet to outlet. Asthe pull is too high, the metal mesh belts near to outlet would overturn outside. As thepull is too small, the metal mesh belts near to inlet would overturn inside. It is goodthat the pull near inlet is1300N and the pull near outlet is1400N. The operation is stabilized when the stiffness of metal mesh belts is1000. In addition, the experimentsdemonstrate the reliability of the results. The analytic method of friction drive isconvenient to the engineering applications. For the five layers metal conveyor beltmodel, the results show that the slip ratios decrease with the increase of pulls.It has advantages of higher efficiency in transmission. As the pull is greater than1000N, the slip ratio of friction driver is steady equal to11.11%. Increasing of pulldifferentials, the efficiency in transmission of frictional pairs is higher too. As the pulldifferentials are1700N, the slip ratio is0. Then the metal mesh belts would workin synchronicity with drums. The axial acceleration is steady and the slip ratio is0asthe pull inlet is300N and the pull outlet is2000N. At the same time, it has the higherefficiency in transmission steadily. And the contact force of metal mesh belts anddrums almost increases linearly with the increasing of pull outlet. From the outlet toinlet, the contact force decreases in layers. As the pull is too high, the metal mesh beltsnear to outlet would overturn outside. As the pull is too small, the metal mesh beltsnear to inlet would overturn inside. Simulating results agree with the experimental dataand indicate that RecurDyn method is efficient. The analytic method of friction driveis convenient to the engineering applications. |
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