Pressure-relief and hole-protection drill pipe for soft coal and rock drilling
A technology for soft coal rock and hole protection, which is used in drill pipes, drill pipes, drilling equipment, etc.
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Embodiment 1
[0028] Embodiment one: if figure 1 As shown in Figure 4, the drill pipe used for pressure relief in soft coal and rock drilling according to the present invention includes a hole-protecting helical blade 1, a row-aiding helical blade 2, and a hollow drill pipe body 3. The hole-protecting helical blade 1, auxiliary The row helical blade 2 and the hollow drill rod body 3 are coaxial, and the row-assisting helical blade 1 and the hole-protecting helical blade 2 are fixed on the hollow drill rod body 3 . The hole-protecting spiral blade is composed of a blade top 8 and a petiole 9, and the width of the blade top 8 is L 1 Greater than petiole 9 width L 2 , blade top 8 width L 1 For petiole 9 width L 2 2~10 times of that. The hole-protecting helical blade 1 and the petiole 9 are structurally designed in two ways without the slag discharge hole 4 or with the slag discharge hole 4 . Auxiliary row screw blade 2 height H 2 Height H lower than the helical blade 1 of the protective ...
Embodiment 2
[0033] Embodiment two: if Figure 7 , Figure 8 As shown, the difference from the first embodiment is that the structure of the hole-protecting helical blade 1 is kept wide on the outside and narrow on the inside, the thickness of the blade tip is reduced, and the slag discharge space 14 is increased. When drilling in areas with high ground stress, high gas pressure, and coal-rock firmness coefficient f≤0.5, the deformation of the borehole is large and the wall of the borehole is seriously damaged. Under this condition, refer to Figure 8 , so that the width of the blade top 8 and the petiole 9 is relatively large, thereby expanding the area of the hole protection, and at the same time, the slag discharge hole 4 is set on the petiole 9 of the hole protection spiral blade 1, and the slag discharge is assisted by compressed air, and the hole protection spiral blade 1 A slag discharge channel is formed between the slag discharge holes 4, which can effectively alleviate the pro...
Embodiment 3
[0034] Embodiment three: as Figure 9 , Figure 10 As shown, the difference from Embodiment 1 is that the cross-sectional shape of the slag discharge hole 4 on the petiole 9 is changed, and a larger area of slag discharge channel is formed between the slag discharge holes 4 of the hole-protecting spiral blade 1, which can more fully Give full play to the effect of pressure-assisted slag removal.
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