本实用新型为左右立柱加顶部横梁的桥式结构，螺母丝杆升降装置沿立柱上下移动。

The utility model is of bridge type structure of right and left upright pillars adding top beam, the lifting device with nut screw mandrel is moving along the upright pillars.

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本实用新型能够有效避免机具升降时，有 效避免了机具升降时变速箱动力传动轴与横梁的干涉。

The utility model can effectively avoid the interference between the power transmission shaft of the gear-box and the cross beam during the process of rising and descending of the machine tool.

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