An introduction is made in the paper of the method for deformation survey of disposal shaft wall and cage guide in No. 5 Mine of Yangquan Mining Group.

文中介绍了阳煤集团五矿排矸井井壁及罐道变形的测量方法。

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Bearing rings and washers cylindrical surface to the radial guide cage.

轴承套圈和垫圈的圆柱形表面，用以在径向引导保持架。

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Pay particular attention to the jockey wheels (these are small wheels in the chain cage of the rear mech that guide the chain round the sprockets) because they pick up hard-packed dirt from the chain.

BBC: Sport