Block proof cover can be made of metal or widely used PVC plastic, the structure is simple for the convenience of installation.
防堵罩可采用金属或使用广泛的PVC塑料制造，结 构简单，安装方便。
This paper introduces a simple graphic method for designing the planar crank slide block mechanism with urgent returning specific property and gives theoretical proof.
介绍了设计有急回特性的平面曲柄滑块机构的简易图解法，并给出了理论证明。
Dust Proof Equipment can prevent iron chips and dust from entering the block and damaging the groove surface.
防尘设备可以防止进入块和破坏凹槽表面铁屑和灰尘。
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