Soft coal seam one-time hole forming while-drilling casing device
A technology of soft coal seam and casing device, which is applied to safety devices, drill bits, drilling equipment, etc., can solve problems such as coal seam easy to collapse holes, etc., and achieve the effect of shortening exposure time, reducing equipment cost, and reducing disturbance.
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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0029] see Figure 1-6 , a kind of soft coal seam one-time hole-drilling casing device in this embodiment includes a multi-stage reaming drill bit 1, the right surface of the multi-stage reaming drill bit 1 is fixedly connected with a blade retraction mechanism 2, and the right surface of the blade retraction mechanism 2 is fixed. It is connected with a rotating drag pipe mechanism 3.
[0030] The multi-stage reaming drill 1 includes a pilot drill 101. The ri...
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