增加托架滚轮纵滚轮的数量，进一步提高了抗冲击能力。
Responding to increase the number of vertical rollers wheel brackets, further improve the shock resistance capability.
采用特制轴承，滚轮灵敏度高； 尼龙密封装置及防撞装置，有效减缓冲击力，确保运行的稳定。
With special bearing, high sensitivity, nylon sealing device and anti collision device, which can effectively reduce the impact force and ensure the stability of the operation.
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