CN112360354B - Mining drill rod assembly capable of rotating forwards and backwards - Google Patents
Mining drill rod assembly capable of rotating forwards and backwards Download PDFInfo
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- CN112360354B CN112360354B CN202011367732.6A CN202011367732A CN112360354B CN 112360354 B CN112360354 B CN 112360354B CN 202011367732 A CN202011367732 A CN 202011367732A CN 112360354 B CN112360354 B CN 112360354B
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- rod
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- 238000005065 mining Methods 0.000 title claims abstract description 17
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 239000012530 fluid Substances 0.000 claims description 24
- 230000002441 reversible effect Effects 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- 238000005553 drilling Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
- E21B17/043—Threaded with locking means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/06—Releasing-joints, e.g. safety joints
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a mining drill rod assembly capable of rotating forwards and backwards, which comprises a rod body, male connectors connected to two ends of the rod body, female connectors used for being in threaded connection with the male connectors, and elastic pieces, wherein a locking assembly is axially and slidably arranged in the rod body, is used for being driven by high-pressure liquid in a drill rod to axially slide towards the male connectors, and partially extends into the female connectors of adjacent drill rods to enable the male connectors and the female connectors of the adjacent drill rods to be circumferentially locked, and the elastic pieces are connected to the locking assembly and have elastic force for enabling the locking assembly to axially slide and reset towards the female connectors; the invention utilizes the screw thread to transmit the positive torque and bear the axial load, and utilizes the high-pressure liquid introduced into the drill rods to drive and realize the automatic locking and unlocking between the adjacent drill rods, thereby avoiding the occurrence of drill clamping and drill holding, reducing the link of manual auxiliary disassembly and assembly, being beneficial to realizing the mechanical automatic assembly and disassembly of the drill rods, and greatly improving the automatic construction efficiency of the drilling machine.
Description
Technical Field
The invention relates to the technical field of mining machinery, in particular to a mining drill rod assembly capable of rotating forward and backward.
Background
At present, two adjacent drill rods are usually connected by conical threads in the drilling construction of a coal mine, the connection structure enables the whole drill rod to only rotate in the forward direction in the drilling process, and the adjacent drill rods are easy to loosen during reverse rotation. For solving the problem of the drill rod reversal, the prior structure usually adopts a pin connection mode to axially lock and position adjacent drill rods, and although the connection mode can realize the forward and backward bidirectional rotation of the drill rods, the loading and unloading process is complicated, the structure is complex, and particularly, when the drill rods are unloaded, a large amount of manual auxiliary operations are needed, and the efficiency is extremely low.
In view of the above technical problems, there is a need for a mining drill rod assembly capable of rotating forward and backward, which is easy to implement drill-up and drill-down operations of a drill rod on the basis of forward and backward rotation of the drill rod, and improves construction efficiency.
Disclosure of Invention
In view of the above, the invention provides a mining drill rod assembly capable of rotating forward and backward, which is easy to realize the operation of drilling up and unloading the drill rod on the basis of realizing the forward and backward rotation of the drill rod, and improves the construction efficiency.
The invention discloses a mining drill rod assembly capable of rotating forwards and reversely, which comprises a rod body, male connectors connected to two ends of the rod body, female connectors used for being in threaded connection with the male connectors, and elastic pieces, wherein locking assemblies are axially and slidably mounted in the rod body, the locking assemblies are used for being driven by high-pressure liquid in drill rods to axially slide towards the male connectors and partially extend into the female connectors of adjacent drill rods to enable the male connectors and the female connectors of the adjacent drill rods to be circumferentially locked, and the elastic pieces are connected to the locking assemblies and have elastic force for enabling the locking assemblies to axially slide and reset towards the female connectors.
Further, the locking assembly comprises a locking sleeve, a channel for high-pressure liquid to flow axially is formed in the locking sleeve, the locking sleeve is in single-degree-of-freedom axial sliding fit with the inner circle of the male connector, and a driven part of the locking sleeve extends into the female connector of the adjacent drill rod and is in single-degree-of-freedom axial sliding fit with the inner circle of the female connector.
Furthermore, the locking sleeve is in single-degree-of-freedom axial sliding fit with the inner circle of the male joint and the inner circle of the adjacent drill rod female joint through a spline.
Furthermore, the locking subassembly still includes the piston of being connected with the locking cover, piston and the interior round axial seal sliding fit of the body of rod, the intracavity circle axial that overflows has seted up the fluid groove in the body of rod, when the piston was slided to the chamber department of overflowing by the drive of high-pressure fluid, made the body of rod inner chamber intercommunication of piston axial both sides through the fluid groove.
Further, the piston is connected with the locking sleeve through a mandrel.
Further, the locking sleeve is of an external spline structure, and the circumferential size of a key body of the locking sleeve is smaller than that of a key groove in the female joint.
Furthermore, the circle has the guide holder of protrusion formation in the female joint, the piston is close to female joint one end and is connected with the uide bushing, circle axial sliding fit in uide bushing and the guide holder, the overflowing hole that supplies the fluid to flow through is seted up to the uide bushing lateral wall.
Furthermore, the elastic part is sleeved on the guide sleeve in an outer sleeving manner, and two ends of the elastic part are respectively connected to the end part of the piston and the end part of the guide seat.
Further, the locking cover is including the cover body and connecting rod, the dabber is located the cover internally and with the coaxial setting of the cover body, the connecting rod is connected between cover internal wall and dabber excircle.
Furthermore, the piston comprises a left half piston body and a right half piston body, an annular groove is formed in the combining surface of the left half piston body and the right half piston body, and the left half piston body and the right half piston body are connected into a whole and enclose an annular cavity in the piston.
The invention has the beneficial effects that:
the drill rod with the structure has a simple structure, is easy to operate and control, can realize automatic locking when drilling and automatic unlocking when unloading the drill, can realize positive and negative alternate rotation and reciprocating hole sweeping to strengthen slag discharge and jam release pressure, thereby avoiding the occurrence of drill jamming and drill holding, reducing the link of manual auxiliary disassembly and assembly, being beneficial to realizing mechanical automatic assembly and disassembly of the drill rod and greatly improving the automatic construction efficiency of the drilling machine; the locking and unlocking of the adjacent drill rods are realized by the cooperation of the piston and the locking sleeve and the combination of high-pressure liquid, wherein the piston is matched with the fluid groove, so that the axial driving of the locking sleeve is realized, and the effective communication of fluid channels of the adjacent drill rods can be maintained.
Drawings
The invention is further described below with reference to the figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partially enlarged schematic view;
FIG. 3 is a schematic cross-sectional view of FIG. 1;
FIG. 4 is a schematic cross-sectional view of FIG. 2;
FIG. 5 is a schematic view of a mating structure of a female connector and a locking sleeve;
Detailed Description
As shown in the figure: the embodiment provides a mining drill rod assembly capable of rotating forward and backward, which comprises a rod body 1, male connectors 2 connected to two ends of the rod body, female connectors 3 used for being in threaded connection with the male connectors, and elastic pieces 4, wherein the threaded connection of the male connectors and the female connectors refers to the connection of the male connector of one drill rod and the female connector of an adjacent drill rod, and the male connectors and the female connectors on the same drill rod are not in direct mutual connection relation; the utility model discloses a drilling rod, including the locking subassembly, the locking subassembly is used for being connected with the locking subassembly, the locking subassembly is installed to axial slidable in the pole body, the locking subassembly is used for being slided to the public connector side by high-pressure liquid drive axial in the drilling rod to partly extend to make the public connector and the locking of female joint circumference of adjacent drilling rod in the female joint of adjacent drilling rod, the elastic component is connected on the locking subassembly and has the elastic force that makes locking subassembly axial slide to the female joint side and reset. In this embodiment, the backward direction is the axial direction towards one side of the female joint, the forward direction is the axial direction towards one side of the male joint, the rod body is of a tubular structure, the male joint and the female joint are axially provided with through flow channels, the male joint and the female joint are welded at two ends of the rod body, so that axially through fluid channels are formed inside the drill rods, the drill rods are mutually connected, so that the fluid channels are sequentially connected to form the flow channels extending into the drill holes, high-pressure liquid such as cutting fluid and slag discharging fluid can be injected into the drill holes through the flow channels, the fluid channels are arranged into the conventional structure, and details are not repeated; the male joint is provided with an external thread section, the female joint is provided with an internal thread hole, the male joint comprises a cylindrical section connected with the rod body and a conical section connected with the cylindrical section, the conical section is a conical external thread joint with the forward external diameter gradually reduced, a conical internal thread hole matched with the conical section of the male joint is arranged in the female joint, and the conical section is used for connecting and positioning the front drill rod and the rear drill rod and can bear forward torque and axial load; the circumferential locking means that the male joint and the adjacent drill rod female joint are locked to realize synchronous rotation, namely the male joint and the adjacent drill rod female joint form transmission fit, wherein the locking assembly is in axial sliding fit with a single-degree-of-freedom inner circle of the male joint, the end part of the locking assembly can be provided with inserting teeth which are uniformly distributed in the circumferential direction and extend in the axial direction, an inserting groove is formed in the female joint in an adaptive axial direction, when the locking assembly slides into the female joint, the inserting teeth slide into the inserting groove to realize locking of the male joint and the female joint, or the locking assembly can realize locking of the male joint and the female joint through structures such as a spline groove and the like, and detailed description is omitted; the elastic element can adopt a cylindrical helical spring or other known elastic structures, which are not described in detail; as shown in the combined figure 1, the drill rod male joint and the adjacent drill rod female joint can only realize forward rotation after being in threaded connection, high-pressure liquid is introduced into the drill rod in the drilling process, wherein the high-pressure liquid can drive the locking assembly to axially slide to realize locking of the adjacent drill rod, so that forward and reverse rotation of the drill rod can be realized without releasing the drill, in addition, when the drill is released, the conveying of the high-pressure liquid is only required to be stopped, at the moment, the elastic piece can drive the locking assembly to reset to unlock the male joint and the female joint of the adjacent drill rod, and at the moment, the drill rod can be released by reversely rotating the drill rod.
In this embodiment, the locking assembly includes a locking sleeve 5, a channel for axial flow of high-pressure liquid is provided in the locking sleeve, the locking sleeve is in single-degree-of-freedom axial sliding fit with the inner circle of the male joint, and the driven part of the locking sleeve extends into the female joint of the adjacent drill rod and is in single-degree-of-freedom axial sliding fit with the inner circle of the female joint. Referring to fig. 1 and 3, the locking sleeve is in sliding fit with the inner circle of the male connector and the inner circle of the female connector with a single degree of freedom to realize circumferential locking of the male connector and the female connector, wherein the locking sleeve can realize corresponding fit relation through a key groove and a key.
In the embodiment, the locking sleeve is in single-degree-of-freedom axial sliding fit with the inner circle of the male joint and the inner circle of the adjacent drill rod female joint through splines. Referring to fig. 3, the locking sleeve is of an external spline structure, the internal circle of the male joint and the internal circle of the female joint are of an internal spline structure, when the locking sleeve partially slides into the female joint of an adjacent drill rod, circumferential locking between the locking sleeve and the female joint is realized through splines, it is ensured that after the male joint and the female joint of the adjacent drill rod are screwed up in a threaded manner, the splines of the internal spline of the male joint and the splines of the internal spline of the female joint of the adjacent drill rod are just axially opposite, and axial accurate matching of the splines of the internal spline of the male joint and the female joint can be realized through control over the length of the threads or accurate control over the axial connection length of the male joint and the female joint, which is not specifically described in detail;
in this embodiment, the locking subassembly still includes the piston 6 of being connected with the locking cover, the piston is with the sealed sliding fit of circle axial in the body of rod, the internal chamber that overflows has in the body of rod, overflow intracavity circle axial and seted up fluid groove 7, when the piston was slided to overflowing chamber department by the drive of high-pressure fluid, make the body of rod inner chamber intercommunication of piston axial both sides through the fluid groove. Referring to fig. 1 and 2, a plurality of sealing rings are arranged on the outer circle of a piston, an overflow cavity is a corresponding inner cavity located at the rear end of a rod body, a fluid groove is a rectangular groove, the groove bottom of the fluid groove is gradually deepened forwards and then leveled by the rear end of the rod body, as shown in fig. 4, in order to increase the overflow capacity, a plurality of fluid grooves are circumferentially distributed at the inner circle of the overflow cavity, under a normal state, the piston is driven by an elastic piece to slide backwards, so that the outer circle of the piston is in sliding and sealing fit with the smooth surface of the inner cavity of a drill rod, cavities located on two axial sides of the piston in the drill rod are in a non-communicated state at the moment, when high-pressure liquid is introduced through a female joint of the drill rod, the liquid can drive the piston to slide forwards, when the piston slides to the overflow cavity, the cavities located on two axial sides of the piston in the drill rod are communicated by the fluid grooves, at the moment, the high-pressure liquid continuously flows through the fluid grooves, so that fluid channels between adjacent drill rods are communicated, and when the piston is driven, the piston can drive a locking sleeve to slide forwards, so that the locking sleeve partially slides to the female joint of the adjacent drill rod, and the locking sleeve, and the high-pressure liquid is utilized.
In this embodiment, the piston is connected to the locking sleeve via a spindle 8. Referring to fig. 1, a piston is arranged at the rear end of a drill rod, a locking sleeve is arranged at the front end of the drill rod, the piston and the locking sleeve are connected into a whole through a mandrel, the outer diameter of the joint of the mandrel, the piston and the locking sleeve is reduced to be matched with the connecting structure of the piston and the locking sleeve, a guide ring can be arranged in a rod body to ensure the reliable sliding of the mandrel, the mandrel is axially slidably sleeved in the guide ring, the middle of the mandrel is provided with a guide and a support through the arrangement of the guide ring, and a through-flow hole is axially formed in the guide ring, which is not specifically described again;
in this embodiment, the locking sleeve is of an external spline structure, and the circumferential dimension of the key body of the locking sleeve is smaller than the circumferential dimension of the key groove in the female joint. As shown in fig. 5, an internal spline structure is arranged in the female joint, the circumferential size of a key groove of the internal spline, namely the width of the key groove, is larger than the corresponding size of an external spline key body of the locking sleeve, the structure is favorable for the locking sleeve to be smoothly matched with the internal spline when axially sliding into the female joint, and certain error allowance is reserved for the connection of the male joint and the female joint, so that the key body of the locking sleeve can be reliably slid into the key groove of the internal spline of the female joint even if the internal splines of the male joint and the female joint are not strictly axially aligned after the male joint and the female joint are connected, the relative rotation angle of the male joint and the female joint can be controlled by controlling the size difference between the key body of the locking sleeve and the key groove of the female joint, and the sealing reliability of the connection of the male joint and the female joint can be ensured; in addition, for controlling the axial sliding stroke of the locking sleeve, the axial length of the internal spline of the female joint should ensure that when the locking sleeve abuts against the tail end of the internal spline of the female joint, the front half part of the locking sleeve is matched with the internal spline of the female joint, and the rear half part of the locking sleeve is matched with the internal spline of the male joint, so that reliable locking is formed on the male and female structures.
In this embodiment, the circle has the guide holder 9 that the protrusion formed in the female joint, the piston is connected with uide bushing 10 near female joint one end, circle axial sliding fit in uide bushing and the guide holder, the discharge orifice that supplies the fluid to flow through is seted up to the uide bushing lateral wall. It is shown in combination with figure 1 that the setting of guide holder makes female joint interior circle form stair structure, the interior circle of guide holder is connected with female joint's toper screw hole, male joint is connected the back with female joint promptly, the front end portion of male joint is just right with the rear end of guide holder, the evagination forms the boss in the rear end department of piston, the boss excircle is the external screw thread structure, uide bushing threaded connection is on this boss, it has the discharge orifice to concentrate on the uide bushing, form direction and support to the piston through the uide bushing, also do benefit to simultaneously and form direction and support to the elastic component.
In this embodiment, the elastic member is sleeved on the guide sleeve, and two ends of the elastic member are respectively connected to the end of the piston and the end of the guide seat. As shown in fig. 2, the elastic member is a cylindrical coil spring, and the guide seat serves as a mounting base of the elastic member to prevent the elastic member from laterally deforming.
In this embodiment, the locking cover includes cover body 5a and connecting rod 5b, dabber 8 is located the cover body and sets up with the cover body is coaxial, the connecting rod is connected between cover body inner wall and dabber excircle. As shown in fig. 3, the mandrel and the locking sleeve are connected through four connecting rods, the four connecting rods are distributed in a central symmetry manner, the number of the specific connecting rods can be adjusted according to an actual structure, and the structure not only realizes reliable connection of the mandrel and the locking sleeve, but also ensures the overcurrent capacity of the locking sleeve.
In this embodiment, the piston includes a left half piston body 6a and a right half piston body 6b, an annular groove is opened at a joint surface of the left half piston body and the right half piston body, and the left half piston body and the right half piston body are connected into a whole and enclose an annular cavity 6c located in the piston. As shown in the combined figure 2, the left half piston and the right half piston can be connected into a whole through welding, and the structure enables the inner part of the piston to be provided with a closed annular cavity, so that the lightweight design of the piston is realized.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A mining drill rod assembly capable of rotating forward and backward is characterized in that: the locking device comprises a rod body, male connectors connected to two ends of the rod body, and female connectors and elastic pieces, wherein the female connectors are used for being in threaded connection with the male connectors, locking assemblies are axially and slidably mounted in the rod body, the locking assemblies are used for being driven by high-pressure liquid in a drill rod to axially slide towards the male connectors and partially extend into the female connectors of adjacent drill rods to enable the male connectors and the female connectors of the adjacent drill rods to be circumferentially locked, and the elastic pieces are connected to the locking assemblies and have elastic force enabling the locking assemblies to axially slide and reset towards the female connectors;
the locking assembly comprises a locking sleeve, a channel for high-pressure liquid to flow axially is formed in the locking sleeve, the locking sleeve is in single-degree-of-freedom axial sliding fit with the inner circle of the male joint, and a driven part of the locking sleeve extends into the female joint of the adjacent drill rod and is in single-degree-of-freedom axial sliding fit with the inner circle of the female joint;
and the locking sleeve is in single-degree-of-freedom axial sliding fit with the inner circle of the male joint and the inner circle of the adjacent drill rod female joint through a spline.
2. The mining reversible drill rod assembly according to claim 1, characterized in that: the locking subassembly still includes the piston of being connected with the locking cover, piston and the sealed sliding fit of circle axial in the body of rod, the internal cavity that has the excessive flow of body of rod, the fluid groove has been seted up to the intracavity circle axial that overflows, the piston is driven by high-pressure fluid and slides when overflowing chamber department, makes the body of rod inner chamber intercommunication of piston axial both sides through the fluid groove.
3. The mining reversible drill rod assembly according to claim 2, characterized in that: the piston is connected with the locking sleeve through a mandrel.
4. The mining reversible drill rod assembly according to claim 1, wherein: the locking sleeve is of an external spline structure, and the circumferential size of a key body of the locking sleeve is smaller than that of a key groove in the female joint.
5. The mining reversible drill rod assembly according to claim 2, characterized in that: the round guide holder that the protrusion formed has in the female joint, the piston is close to female joint one end and is connected with the uide bushing, circle axial sliding fit in uide bushing and the uide holder, the uide bushing lateral wall is seted up and is supplied the discharge orifice that the fluid flowed through.
6. The mining reversible drill rod assembly according to claim 5, wherein: the elastic part is sleeved on the guide sleeve in an sleeved mode, and two ends of the elastic part are connected to the end portion of the piston and the end portion of the guide seat respectively.
7. The mining reversible drill rod assembly according to claim 3, wherein: the locking cover is including the cover body and connecting rod, the dabber is located the cover internally and with the coaxial setting of the cover body, the connecting rod is connected between set internal wall and dabber excircle.
8. The mining reversible drill rod assembly according to claim 2, characterized in that: the piston comprises a left half piston body and a right half piston body, an annular groove is formed in the combining surface of the left half piston body and the right half piston body, and the left half piston body and the right half piston body are connected into a whole and enclose an annular cavity in the piston.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011367732.6A CN112360354B (en) | 2020-11-29 | 2020-11-29 | Mining drill rod assembly capable of rotating forwards and backwards |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011367732.6A CN112360354B (en) | 2020-11-29 | 2020-11-29 | Mining drill rod assembly capable of rotating forwards and backwards |
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| CN112360354A CN112360354A (en) | 2021-02-12 |
| CN112360354B true CN112360354B (en) | 2023-03-14 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113482546B (en) * | 2021-08-19 | 2023-10-24 | 中煤科工集团重庆研究院有限公司 | Forward and reverse rotation drill rod |
| CN113482547A (en) * | 2021-08-25 | 2021-10-08 | 中煤科工集团重庆研究院有限公司 | Embedded drilling rod capable of rotating forwards and backwards |
| CN114278235A (en) * | 2021-11-09 | 2022-04-05 | 冀凯河北机电科技有限公司 | Positive and negative rotation threaded connection drill rod with self-locking function |
| CN114562218B (en) * | 2022-03-10 | 2023-05-02 | 中国矿业大学 | Ratchet type automatic loading and unloading forward and reverse rotation communication drill rod of coal mine drilling robot |
| CN114893140B (en) * | 2022-05-09 | 2024-03-12 | 中国铁建重工集团股份有限公司 | Drill bit direction-adjusting device, using method thereof and directional core drill bit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204200101U (en) * | 2014-07-08 | 2015-03-11 | 江苏兴厦建设工程集团有限公司 | A kind of drilling rod adopting taper pipe thread and spline slide sleeve to be connected |
| CN207598199U (en) * | 2017-11-20 | 2018-07-10 | 德威土行孙工程机械（北京）有限公司 | A kind of interior bar positions formula double-wall drill pipe |
| CN110374521B (en) * | 2019-08-07 | 2020-10-23 | 中煤科工集团重庆研究院有限公司 | Mining positive and negative rotation automatic dismounting type drill rod |
| CN111119753B (en) * | 2020-02-25 | 2021-08-31 | 中煤科工集团西安研究院有限公司 | Drill rod male joint, automatic plug-in type spiral drill rod and construction method of automatic plug-in type spiral drill rod |
| CN111997539A (en) * | 2020-08-24 | 2020-11-27 | 中煤科工集团重庆研究院有限公司 | Mining positive and negative rotation full-machine loading and unloading drill rod |
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