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具有提升设备的常规自动捣固机,使轨枕与道床顶面之间形成小小的空隙,以便填入所需填充的石碴,而且只能允许捣固镐头水平伸入。因此通过捣固,松动原有道床来填塞空隙从而形成不稳固的道床。而英国铁路提出的风动道碴喷射器的建议,获得英国2021180A 号专利,成功地用风力将小碎石推入空隙部分,提供稳固的新道床顶面。通过一个插入轨枕侧面空心的铁锹式的工具。用风力将小道碴压入空隙。
Conventional automatic tamping machines with lifting equipment form a small gap between the sleeper and the top of the bed to fill in the ballast to be filled and only allow tamper picks to extend horizontally. Therefore by tamping, loosen the original bed to fill the gap to form unstable bed. The British Rail proposed pneumatic ballast injector, access to the British No. 2021180A patent, the wind power has been successfully used to push small pieces of stone into the gap, to provide a solid new top surface of the track. Pass a hollow shovel-like tool that plugs into the side of the sleeper. Press the ballast into the gap with the wind.