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首页> 外文期刊>Progress in agricultural engineering sciences >The Power Transmission Stability and Efficiency of V-belts
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The Power Transmission Stability and Efficiency of V-belts

机译：三角皮带的动力传递稳定性和效率

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摘要

The V-belt drive is a rather popular, widely used form of power transmission in agricultural arid food industry engineering. At the same time, its stability, the lifetime of V-belt is influenced by several environmental factors, namely in the food industry by the contamination affecting the belt sides, the ambient temperature, humidity and the occasionally aggressive (acidic, alkaline air, air saturated with gases, etc.) medium. In the case of agricultural machinery, the vibration caused by uncertainly oriented pulleys with bearing in different plate structures (often being shaken in the fields) as well as alignment adjustment inaccuracies jeopardize the reliability of the parameters of the drive. Furthermore, the efficiency is determined by severalfactors together: the slippage occurring during drive transmission, the hysteresis loss resulting from the external and internal friction occurring with the belt entering and exiting the pulley. Experimental equipment and calculation methods were developed to determine the dynamics of temperature increase generated by the belt and pulley relationship. The temperature generated in the V-belt was measured as a function of pretension, pulley diameter and bending frequency. The so-called damping factor characterizing the contact with the pulley (the external friction when entering and exiting the groove) and the hysteresis loss (inner friction) are also determined. On the basis of the damping factor 400 Ns/tn2) of the V-belt involved in the experiments the other losses (P0th) occurring from the pulley-V-belt contact and internal friction may be estimated. The drive parameters may be optimized with the mathematical model describing the effect of the pulley diameter and belt frequency on the increase in temperature.A standardized calculation method as well as design factors valid for the properly adjusted drive and normal operating conditions determined through empirical and laboratory experiments are used for the sizing of V-belt drives. The lifetime of V-belt drives designed in this way, used in extreme conditions typical of agricultural machinery will not be appropriate and will not provide clear, predictable information for maintenance planning. In such cases the results of our own many lifetime tests conducted in the given circumstances can be safely relied on.The agricultural harvesting machines are large plate-body self-propelled structures on which most of the power supply of the (threshing, cleaning, moving, etc.) machine units handling the crop is realized via belt drives.
机译：三角皮带传动是农业干旱食品工业工程中非常流行的，广泛使用的动力传动形式。同时，其稳定性，三角皮带的使用寿命受到多种环境因素的影响，即在食品工业中，污染会影响皮带的侧面，环境温度，湿度以及偶尔的腐蚀性（酸性，碱性空气，空气）。充满气体等）介质。在农业机械的情况下，带有不确定轴承的皮带轮在不同板结构中的振动（常常在田间摇晃）以及对准调整的不准确性所引起的振动会损害驱动器参数的可靠性。此外，效率由几个因素共同决定：驱动传动过程中发生打滑，皮带进入和退出皮带轮时由于内部和内部摩擦而产生的磁滞损耗。开发了实验设备和计算方法来确定由皮带和皮带轮关系产生的温度升高的动力学。测量三角皮带产生的温度与预紧力，皮带轮直径和弯曲频率的关系。还确定了表征与皮带轮接触（进入和离开凹槽时的外部摩擦力）和磁滞损耗（内部摩擦力）的所谓阻尼系数。基于试验中所涉及的三角带的阻尼系数400 Ns / tn2），可以估算出由于三角带与三角带的接触和内部摩擦而产生的其他损失（P0th）。可以使用描述皮带轮直径和皮带频率对温度升高的影响的数学模型来优化驱动参数。标准化的计算方法以及对因应经验和实验室确定的适当调整的驱动以及正常运行条件有效的设计系数实验用于三角皮带传动装置的尺寸确定。在农业机械典型的极端条件下使用的以这种方式设计的三角皮带传动装置的使用寿命将不合适，并且不会为维护计划提供清晰，可预测的信息。在这种情况下，我们在给定情况下进行的许多寿命测试的结果都可以安全地依靠。农业收割机是大型的板状自行结构，其大部分电源（脱粒，清洁，移动）等）处理农作物的机器单元是通过皮带传动实现的。

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