CN104088589A - Drilling tool and rotary drilling jig - Google Patents
Drilling tool and rotary drilling jig Download PDFInfo
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- CN104088589A CN104088589A CN201410309513.0A CN201410309513A CN104088589A CN 104088589 A CN104088589 A CN 104088589A CN 201410309513 A CN201410309513 A CN 201410309513A CN 104088589 A CN104088589 A CN 104088589A
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Abstract
The invention discloses a drilling tool and a rotary drilling jig. The drilling tool comprises an inner drilling tool and an outer drilling tool, wherein the inner drilling tool is sleeved with the outer drilling tool. An inner drill bit is arranged at the bottom of the inner drilling tool, and an outer drill bit is arranged at the bottom of the outer drilling tool. A first torque transmission mechanism connected with a drill rod is arranged on the top of the inner drilling tool. The inner drilling tool is connected with the outer drilling tool through a second torque transmission mechanism. On one hand, the outer drilling tool of the drilling tool has the wall protection effect, on the other hand, the outer drilling tool can cut a soil layer or stones at the bottom of the outer drilling tool, accordingly, it is guaranteed that in the hard stratum drilling process, the outer drilling tool can always follow up the inner drilling tool for burying, the probability of accidents such as collapse is reduced, and production efficiency also can be improved.
Description
Technical field
The present invention relates to engineering machinery field, particularly a kind of drilling tool and rotary drilling rig.
Background technology
Rotary drilling rig is a kind of construction machinery for the operation of building foundation engineering pore-forming, and it is mainly suitable for the construction of the soil layers such as sand, cohesive soil, slity soil, extensive application in the multiple foundation basic constructions such as castinplace pile, diaphragm wall, underpin.
When rotary drilling rig is constructed at caving ground, conventionally adopt the mode of entering with pipe bit to construct, the so-called pipe bit of following enters to refer to sheathed sleeve pipe outside drill bit, on one side hole while creeping into, creeps into mode Yi Bian cased.Employing aforesaid way can play the effect that prevents landslide and improve efficiency of construction.
For sleeve pipe bottom, be the situation of the soft formations such as soil layer or layer of sand, in the mode drilling process that employing is entered with pipe bit, sleeve pipe relies on pressure and moment of torsion, and the drilling tool that can follow up is buried underground; But, for sleeve pipe bottom, be that hard formation or a part are in hole during the situations such as stone of a part outside hole, because the bit diameter in sleeve pipe is less than casing inner diameter, be difficult to excise the stone of sleeve pipe bottom, the sleeve pipe drilling tool that cannot follow up is buried underground, also cannot bring into play retaining wall effect, easily cause the accidents such as landslide.
Summary of the invention
In view of this, the present invention proposes a kind of drilling tool and rotary drilling rig also for hardpan with good retaining wall effect.For achieving the above object, technical scheme of the present invention is achieved in that
On the one hand, the invention provides a kind of drilling tool, comprising: interior drilling tool, and be sheathed on the outer drilling tool of described interior drilling tool periphery; The bottom of described interior drilling tool is provided with interior drill bit, and the bottom of described outer drilling tool is provided with outer drill bit; Described interior drilling tool top is provided with the first torque transmission mechanism for being connected with drilling rod; Between described interior drilling tool and described outer drilling tool, by the second torque transmission mechanism, be connected.
Further, described the second torque transmission mechanism comprises: be arranged at keyway or the key of described interior drilling tool, and relative set is in key or the keyway of described outer drilling tool.
Further, described interior drilling tool is provided with to press turns round dish, and described pressure is turned round and on dish, offered keyway; Described outer drilling tool comprises: be sheathed on the outer bit head outside described interior drilling tool, and be sheathed on the sleeve part outside described outer bit head; The bottom of described outer bit head is provided with described outer drill bit, and top is provided with the key suitable with described keyway; Described outer bit head also comprises the first axial limiting portion and the second axial limiting portion; Described sleeve part is provided with the 3rd axial limiting portion between described the first axial limiting portion and the second axial limiting portion.
Further, described outer bit head comprises: outer tube; Be arranged at the projection edge on described outer tube top, and be arranged at the lower convexity edge of described outer tube bottom; The top at described projection edge is provided with described key, and the bottom at described lower convexity edge is provided with described outer drill bit; Described projection edge forms described the first axial limiting portion, and described lower convexity edge forms described the second axial limiting portion.
Further, the external diameter of described outer drill bit is not less than the external diameter of described sleeve part.
Further, described the 3rd limiting section is the boss to described sleeve part internal protrusion.
Further, described sleeve part comprises: sleeve body and contiguous block, be provided with described boss on described contiguous block; The outer wall of described sleeve body is provided with mounting groove, on described mounting groove, offers installing hole; Described contiguous block is dismountable to be installed in described mounting groove, and described boss wore described installing hole.
Further, the external surface of described contiguous block and the external surface of described sleeve body are concordant.
Further, between described the first axial limiting portion and described the second axial limiting portion, leave the space that can move axially and circumferentially rotate for described the 3rd axial limiting portion.
On the other hand, the present invention also provides a kind of rotary drilling rig, is provided with the drilling tool described in above-mentioned any one.
Drilling tool provided by the invention includes interior drilling tool and outer drilling tool.Wherein, interior drilling tool, for being connected with drilling rod, is main drilling mechanism.It is peripheral that outer drilling tool is sheathed on interior drilling tool, and by the second torque transmission mechanism, moment of torsion is passed to outer drilling tool and make the outer drill bit that is arranged at outer drilling tool bottom can rotate cutting.The power transmission process of this drilling tool is: drilling rod is given interior drilling tool by the first torque transmission mechanism by transmission of power, and the interior drill bit of interior drilling tool bottom is rotated cutting; Simultaneously, drilling tool is also given outer drilling tool by the second torque transmission mechanism by a part of transmission of power, and then drives the stratum of the external drilling tool of the outer drill bit bottom of outer drilling tool bottom to be rotated cutting.Outer drilling tool plays the effect of retaining wall on the one hand thus; Externally soil layer or the stone of drilling tool bottom cut on the other hand, and to guarantee in hardpan drilling process, the outer drilling tool interior drilling tool that can follow up is all the time buried underground, and then reduces the probability of the accidents such as landslide, can also enhance productivity.
Accompanying drawing explanation
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
The perspective view of the drilling tool that Fig. 1 provides for the embodiment of the present invention;
The cross-sectional view of the drilling tool that Fig. 2 provides for the embodiment of the present invention;
The perspective view of drilling tool in the drilling tool that Fig. 3 provides for the embodiment of the present invention;
The cross-sectional view of the drilling tool China and foreign countries drilling tool that Fig. 4 provides for the embodiment of the present invention;
The perspective view of the outer bit head of the drilling tool China and foreign countries drilling tool that Fig. 5 provides for the embodiment of the present invention;
The perspective view of the sleeve part of the drilling tool China and foreign countries drilling tool that Fig. 6 provides for the embodiment of the present invention;
The perspective view of the sleeve body of the drilling tool China and foreign countries drilling tool that Fig. 7 provides for the embodiment of the present invention;
The perspective view of the contiguous block of the drilling tool China and foreign countries drilling tool that Fig. 8 provides for the embodiment of the present invention.
Description of reference numerals:
1 interior drilling tool
11 interior drill bits 12 are pressed and are turned round dish
121 keyways 13 connect square toes
14 open base pressure bar 15 inner tubes
4 outer drilling tools
2 outer bit head
21 outer tube 22 keys
23 outer drill bit 24 projection edges
25 lower convexity edges
3 sleeve parts
30 sleeve body 31 mounting grooves
311 installing hole 32 contiguous blocks
33 boss
The specific embodiment
It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the present invention can combine mutually.Below in conjunction with accompanying drawing, each preferred embodiment of the present invention is described further.
Refer to Fig. 1 and Fig. 2, the figure shows the structure of the drilling tool that the embodiment of the present invention provides.This drilling tool is a kind of drilling tool of entering with pipe bit of being applicable to, and specifically comprises:
Interior drilling tool 1, and be sheathed on the outer drilling tool 4 of this interior drilling tool 1 periphery;
The bottom of above-mentioned interior drilling tool 1 is provided with interior drill bit 11, and the bottom of outer drilling tool 4 is provided with outer drill bit 23;
Interior drilling tool 1 top is provided with the first torque transmission mechanism for being connected with drilling rod;
Between interior drilling tool 1 and outer drilling tool 4, by the second torque transmission mechanism, be connected.
The drilling tool that the present embodiment provides is comprised of interior drilling tool 1 and outer drilling tool 4 these two parts.Wherein interior drilling tool 1, for being connected with drilling rod, is main drilling mechanism.Outer drilling tool 4 is sheathed on the periphery of interior drilling tool 1, on the one hand, plays the effect that is similar to sleeve pipe of the prior art, plays the effect of retaining wall; On the other hand, these outer drilling tool 4 bottoms are provided with outer drill bit 23, and outer drilling tool 4 can be driven and be rotated by interior drilling tool 1 by the second torque transmission mechanism, externally soil layer or the stone of drilling tool 4 bottoms cut outer drill bit 23 thus, to guarantee when hardpan creeps into, the outer drilling tool 4 interior drilling tool 1 that can follow up is all the time buried underground, and then reduces the probability of the accidents such as landslide, has also improved production efficiency.
The power transmission process of the drilling tool that the present embodiment provides is: drilling rod is given interior drilling tool 1 by the first torque transmission mechanism by transmission of power, and the interior drill bit 11 of interior drilling tool 1 bottom is rotated cutting; Simultaneously, drilling tool 1 is also given outer drilling tool 4 by the second torque transmission mechanism by a part of transmission of power, and then drives the stratum of outer drill bit 23 external drilling tool 4 bottoms of outer drilling tool 4 bottoms to be rotated cutting.Above-mentioned the first torque transmission mechanism can be connection side 13, connection side's header structure that can adopt existing drilling tool to be connected with drilling rod, and this concrete structure that connects square toes 13 can be same as the prior art, and the present invention does not hereby repeat this.Above-mentioned the second torque transmission mechanism can connect torque transmission mechanism for key.Particularly.This second torque transmission mechanism can comprise: be arranged at keyway or the key of interior drilling tool 1, and relative set is in key or the keyway of outer drilling tool 4.For the ease of processing, refer to Fig. 3, interior drilling tool 1 can be provided with to press turns round dish 12, and this pressure is turned round on dish 12 and is offered keyway 121.Accordingly, outer drilling tool 4 is provided with the key suitable with this keyway 121.Further, above-mentioned interior drilling tool 1 specifically can comprise inner tube 15, and the pressure that is arranged at these inner tube 15 outer walls is turned round dish 12.The structure of inner tube 15 can be identical with existing drilling tool structure, such as dragging for sand drilling bucket, embedding rock drilling pipe etc.Inner tube 15 can be provided with out base pressure bar 14 (referring to Fig. 2), bores at the end, by the boring mud removal in inner tube 15 so that open.
Above-mentioned outer drilling tool 4 can be structure as a whole, and can be also Split type structure.The outer drilling tool 4 of integrative-structure is in drilling process, whole outer drilling tool 4 all rotates with interior drilling tool 1, its advantage is simple in structure, is convenient to install, but drilling through for deep hole, required outer drilling tool 4 is also longer, weight is larger, and the resistance of rotation is also larger, if now adopt integrative-structure, need interior drilling tool 1 that higher moment of torsion output is provided, energy consumption is larger.Thus, preferably adopt the outer drilling tool 4 of Split type structure in the present embodiment, the part in outer drilling tool 4 realizes cutting along with interior drilling tool 1 rotates, and another part does not rotate, and saves energy consumption.Particularly, refer to Fig. 4, this outer drilling tool 4 can comprise:
Be sheathed on the outer bit head 2 (referring to Fig. 5) outside interior drilling tool 1;
And be sheathed on the sleeve part 3 (referring to Fig. 6) outside outer bit head 2;
The bottom of outer bit head 2 is provided with above-mentioned outer drill bit 23, and the top of outer bit head 2 is provided with the key 22 suitable with above-mentioned keyway 121;
Outer bit head 2 also comprises the first axial limiting portion and the second axial limiting portion; Sleeve part 3 is provided with the 3rd axial limiting portion between above-mentioned the first axial limiting portion and the second axial limiting portion.Preferably, between above-mentioned the first axial limiting portion and the second axial limiting portion, leave the space that can move axially and circumferentially rotate for the 3rd axial limiting portion.
The outer drilling tool 4 of above-mentioned Split type structure comprises the outer bit head 2 of rotating with interior drilling tool 1, and the sleeve part 3 not rotating with interior drilling tool 1.Above-mentioned sleeve part 3 mainly plays the effect of retaining wall, and outer bit head 2 is rotated and driven outer drill bit 23 to rotate cutting, plays the effect of removing outer drilling tool 4 bottom solums or stone.Thus, interior drilling tool 1 is without driving whole outer drilling tool 4 to rotate, but only need to drive outer bit head 2 to rotate, in the situation that assurance is exported compared with low energy consumption, realized outer drilling tool 4 follow up all the time in drilling tool 1 nuzzle.In drilling process, the supporting role making progress of the external bit head 2 of soil layer, and the pressure of interior drilling tool 1 turn round that dish 12 external bit head 2 arrange key 22 pronely compress effect, make key 22 can be positioned at all the time keyway 121.In addition, in order to prevent that axial direction upper bush portion 3 and outer bit head 2 are separated, between above-mentioned sleeve part 3 and outer bit head 2, be also provided with axial limiting mechanism, be specially above-mentioned the first axial limiting portion, the second axial limiting portion and the 3rd axial limiting portion.After installation, the 3rd axial limiting portion of sleeve part 3 is positioned between the first axial limiting portion and the second axial limiting portion of outer bit head 2, and making thus can have certain axial displacement between outer bit head 2 and sleeve part 3, but the two can not be separated.And pore-forming is carried while boring, extracting cannula portion 3 can be by outer bit head 2 together with taking out of.
Above-mentioned the first axial limiting portion and the second axial limiting portion are specifically as follows convex edge structure, further, refer to Fig. 5, and above-mentioned outer bit head 2 specifically can comprise:
Outer tube 21;
Be arranged at the projection edge 24 on outer tube 21 tops, and be arranged at the lower convexity edge 25 of outer tube 21 bottoms;
The top at projection edge 24 is provided with above-mentioned key 22, and the bottom at lower convexity edge 25 is provided with above-mentioned outer drill bit 23;
Projection edge 24 forms above-mentioned the first axial limiting portion, and lower convexity edge 25 forms above-mentioned the second axial limiting portion.
In the outer bit head 2 of said structure, the external diameter that outer drill bit 23 is preferably set is not less than the external diameter of sleeve part 3, guarantees that thus the soil layer of sleeve part 3 belows and stone all can be by outer drill bit 23 cuttings.The external diameter of above-mentioned outer drill bit 23 refers to the edge diameter of the shape that some outer drill bits are enclosed to form.In addition, in the outer bit head 2 of said structure, its first axial limiting portion and the second axial limiting portion are formed by two lugs edges that are arranged at outer cylinder body 21 tops and bottom respectively, and these outer bit head 2 integral body are that a kind of two ends are wider, the structure that middle part is thinner.The 3rd axial limiting portion of sleeve part 3 is arranged between above-mentioned two lugs edge.In addition, outer drill bit 23 is arranged at lower convexity edge 25, therefore can adjust by adjusting the external diameter at lower convexity edge 25 scope that arranges of outer drill bit 23.As preferred version, the external diameter at lower convexity edge 25 is not less than the external diameter of sleeve part 3, so that outer drill bit 23 has enough large external diameters that arranges, to guarantee that soil layer or the stone of sleeve part 3 bottoms can be by outer drill bit 23 cuttings.
The 3rd axial limiting portion of sleeve part 3 can be the boss structure to sleeve part 3 internal protrusion.This boss can be structure as a whole with sleeve part 3, can be also Split type structure.For the ease of the installation of outer bit head 2 and sleeve part 3, also for the ease of changing the boss having damaged.Boss is dismountable being arranged on sleeve part 3 preferably.Particularly, refer to Fig. 7 and Fig. 8, this sleeve part 3 comprises: sleeve body 30 and contiguous block 32, be provided with boss 33 on contiguous block 32;
The outer wall of sleeve body 30 is provided with mounting groove 31, offers installing hole 311 on mounting groove 31;
Contiguous block 32 is dismountable to be installed in above-mentioned mounting groove 31, and boss 33 wore installing hole 311.
Be that in this case, boss 33 is arranged on contiguous block 32, the dismountable mounting groove 31 that is installed on sleeve body 30 of contiguous block 32 realized to the detachable installation of boss 33.During installation, boss 33 wore installing hole 311 and formed above-mentioned the 3rd axial limiting portion.Contiguous block 32 can be installed on sleeve 30 by securing members such as screws.Further, in order to prevent that too much boring mud is piled up in mounting groove 31, or the too much collision of the hole wall of contiguous block 32 and boring, the external surface that above-mentioned contiguous block 32 is preferably set is concordant with the external surface of sleeve body 30.
In addition,, in order to lower the friction of outer bit head 2 in rotation process and between sleeve part 3, can arrange between the boss 33 of sleeve part 3 and the outer wall of outer bit head 2 and leave gap; Or it is shiny surface that the face that boss 33 contacts with outer bit head 2 is set, and/or the outer wall of sleeve part 3 between projection edge 24 and lower convexity edge 25 is shiny surface.Between projection edge 24 and lower convexity edge 25, preferably leave the space that can move axially and circumferentially rotate for boss 33.
As shown in the above, the drilling tool that the embodiment of the present invention provides includes interior drilling tool and outer drilling tool.Wherein, interior drilling tool, for being connected with drilling rod, is main drilling mechanism.It is peripheral that outer drilling tool is sheathed on interior drilling tool, and by the second torque transmission mechanism, moment of torsion is passed to outer drilling tool and make the outer drill bit that is arranged at outer drilling tool bottom can rotate cutting.The power transmission process of this drilling tool is: drilling rod is given interior drilling tool by the first torque transmission mechanism by transmission of power, and the interior drill bit of interior drilling tool bottom is rotated cutting; Simultaneously, drilling tool is also given outer drilling tool by the second torque transmission mechanism by a part of transmission of power, and then drives the stratum of the external drilling tool of the outer drill bit bottom of outer drilling tool bottom to be rotated cutting.Outer drilling tool plays the effect of retaining wall on the one hand thus; Externally soil layer or the stone of drilling tool bottom cut on the other hand, and to guarantee in hardpan drilling process, the outer drilling tool interior drilling tool that can follow up is all the time buried underground, and then reduces the probability of the accidents such as landslide, can also enhance productivity.
The embodiment of the present invention also provides a kind of rotary drilling rig, this rotary drilling rig is provided with above-mentioned any drilling tool, because above-mentioned any drilling tool has above-mentioned technique effect, therefore, the rotary drilling rig that is provided with this drilling tool also should possess corresponding technique effect, its specific implementation process is similar to the above embodiments, does not hereby repeat.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a drilling tool, is characterized in that, comprising:
Interior drilling tool (1), and be sheathed on the peripheral outer drilling tool (4) of described interior drilling tool (1);
The bottom of described interior drilling tool (1) is provided with interior drill bit (11), and the bottom of described outer drilling tool (4) is provided with outer drill bit (23);
Described interior drilling tool (1) top is provided with the first torque transmission mechanism for being connected with drilling rod;
Between described interior drilling tool (1) and described outer drilling tool (4), by the second torque transmission mechanism, be connected.
2. drilling tool according to claim 1, is characterized in that,
Described the second torque transmission mechanism comprises: be arranged at keyway or the key of described interior drilling tool (1), and relative set is in key or the keyway of described outer drilling tool (4).
3. drilling tool according to claim 2, is characterized in that,
Described interior drilling tool (1) is provided with to press turns round dish (12), and described pressure is turned round and on dish (12), offered keyway (121);
Described outer drilling tool (4) comprising: be sheathed on the outer outer bit head (2) of described interior drilling tool (1), and be sheathed on the outer sleeve part (3) of described outer bit head (2);
The bottom of described outer bit head (2) is provided with described outer drill bit (23), and top is provided with the key (22) suitable with described keyway (121);
Described outer bit head (2) also comprises the first axial limiting portion and the second axial limiting portion; Described sleeve part (3) is provided with the 3rd axial limiting portion between described the first axial limiting portion and the second axial limiting portion.
4. drilling tool according to claim 3, is characterized in that, described outer bit head (2) comprising:
Outer tube (21);
Be arranged at the projection edge (24) on described outer tube (21) top, and be arranged at the lower convexity edge (25) of described outer tube (21) bottom;
The top at described projection edge (24) is provided with described key (22), and the bottom at described lower convexity edge (25) is provided with described outer drill bit (23);
Described projection edge (24) forms described the first axial limiting portion, and described lower convexity edge (25) forms described the second axial limiting portion.
5. drilling tool according to claim 4, is characterized in that, the external diameter of described outer drill bit (23) is not less than the external diameter of described sleeve part (3).
6. according to the drilling tool described in any one in claim 3 to 5, it is characterized in that, described the 3rd limiting section is the boss (33) to described sleeve part (3) internal protrusion.
7. drilling tool according to claim 6, is characterized in that, described sleeve part (3) comprising: sleeve body (30) and contiguous block (32), be provided with described boss (33) on described contiguous block (32);
The outer wall of described sleeve body (30) is provided with mounting groove (31), offers installing hole (311) on described mounting groove (31);
Described contiguous block (32) is dismountable to be installed in described mounting groove (31), and described boss (33) wore described installing hole (311).
8. drilling tool according to claim 7, is characterized in that, the external surface of described contiguous block (32) is concordant with the external surface of described sleeve body (30).
9. drilling tool according to claim 3, is characterized in that, leaves the space that can move axially and circumferentially rotate for described the 3rd axial limiting portion between described the first axial limiting portion and described the second axial limiting portion.
10. a rotary drilling rig, is characterized in that, is provided with the drilling tool described in claim 1 to 9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309513.0A CN104088589B (en) | 2014-07-01 | 2014-07-01 | Drilling tool and rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410309513.0A CN104088589B (en) | 2014-07-01 | 2014-07-01 | Drilling tool and rotary drilling rig |
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| Publication Number | Publication Date |
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| CN104088589A true CN104088589A (en) | 2014-10-08 |
| CN104088589B CN104088589B (en) | 2016-08-24 |
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| CN201410309513.0A Active CN104088589B (en) | 2014-07-01 | 2014-07-01 | Drilling tool and rotary drilling rig |
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| CN106639888A (en) * | 2016-10-25 | 2017-05-10 | 北京中车重工机械有限公司 | Rotary drilling rig and drilling bucket assembly thereof |
| CN109989715A (en) * | 2019-05-17 | 2019-07-09 | 天明(南京)智能装备科技有限公司 | The drill tool assembly of engineering driller |
| CN110080677A (en) * | 2019-04-07 | 2019-08-02 | 江山显进机电科技服务有限公司 | A kind of well-digging method |
| CN111794675A (en) * | 2020-07-14 | 2020-10-20 | 中铁十九局集团矿业投资有限公司 | Surface mine blasthole drilling equipment |
| CN111963062A (en) * | 2020-08-26 | 2020-11-20 | 浙江易通特种基础工程股份有限公司 | Drag bit for drilling ovum gravel layer during construction of height-limited space |
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| CN106639888A (en) * | 2016-10-25 | 2017-05-10 | 北京中车重工机械有限公司 | Rotary drilling rig and drilling bucket assembly thereof |
| CN110080677A (en) * | 2019-04-07 | 2019-08-02 | 江山显进机电科技服务有限公司 | A kind of well-digging method |
| CN110080677B (en) * | 2019-04-07 | 2020-10-30 | 绍兴迪艾仕机械设计有限公司 | Well drilling method |
| CN109989715A (en) * | 2019-05-17 | 2019-07-09 | 天明(南京)智能装备科技有限公司 | The drill tool assembly of engineering driller |
| CN109989715B (en) * | 2019-05-17 | 2024-02-06 | 天明(南京)智能装备科技有限公司 | Drilling tool assembly of engineering driller |
| CN111794675A (en) * | 2020-07-14 | 2020-10-20 | 中铁十九局集团矿业投资有限公司 | Surface mine blasthole drilling equipment |
| CN111963062A (en) * | 2020-08-26 | 2020-11-20 | 浙江易通特种基础工程股份有限公司 | Drag bit for drilling ovum gravel layer during construction of height-limited space |
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| CN104088589B (en) | 2016-08-24 |
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