CN109944557A - Bionical pin end and its manufacturing procedure with spine structure characteristic - Google Patents
Bionical pin end and its manufacturing procedure with spine structure characteristic Download PDFInfo
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- CN109944557A CN109944557A CN201910262019.6A CN201910262019A CN109944557A CN 109944557 A CN109944557 A CN 109944557A CN 201910262019 A CN201910262019 A CN 201910262019A CN 109944557 A CN109944557 A CN 109944557A
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Abstract
A kind of bionical pin end and its manufacturing procedure with spine structure characteristic, bionical pin end includes torsion pass end, connecting pin and cushion, comprising forming fitting connection structure that is mutually chimeric and can separating but cannot disengage once secondary cut between the torsion pass end and connecting pin, it is transmitted for torque at torsion pass end, connecting pin is used for the threaded connection of pin end and female connector, the cushion is in the fitting connection structure between torsion pass end and connecting pin with the micro-deformation for absorbing drilling rod, and layer is destroyed as pre-, realize pin end fracture of root position from changing at random to controllable position, to form the flexible structure of imitative backbone elastic cartilage and ligament characteristic；Thus, the present invention inherently improves pin end root stress, creatively separates pin end torsion pass function and linkage function, after realizing pin end torsion pass disabler, linkage function does not fail, to thoroughly solve drilling rod on business " fall bore " problem caused by root of joint fracture.
Description
Technical field
The present invention relates to the technical field of coal mine, geology and petroleum more particularly to a kind of it can be widely used in various drilling rods
The bionical pin end and its manufacturing procedure with spine structure characteristic.
Background technique
With the development of the industries drilling technique such as coal mine, geology and petroleum, the demand to horizontal well close over long distances is increasingly
It is more.When drilling increases to certain depth, the frictional resistance effect of hole wall makes bit pressure that can not be effectively passed to drill bit, thus needs to apply
Bigger bit pressure.On the one hand the raising of bit pressure increases the axial compressive force of drilling rod, on the other hand also exacerbate hole deviation, in turn
Hole wall also increases with it the additional bending moment of drilling rod, be easy to cause drill rod breaking accident, causes tremendous economic to damage for drilling project
It loses.
According to statistics, 80% or more drill rod breaking accident all occurs to detain in fillet of tool joint pins thread root one or two detain
Place.Further analysis it can be seen that: due to tool joint thread connection be entire drill string weak link, additional axial load
It is mainly undertaken by two buttons of fillet of tool joint pins thread root with moment of flexure, stress easy to form is concentrated, when local stress is more than public affairs
When the yield strength of joint material, easily it is broken in pin end thread root.
Chinese invention patent CN106150401 A discloses a kind of flex-stem and drilling equipment, and flexible nipple is by spending
Key bulb and matched ball-and-socket mechanism composition, ball-and-socket mechanism are connected on the shell by pin.Chinese invention patent CN
107869312 A disclose a kind of flex-stem for the small radius of curvature directional well drilling of petroleum, and the flex-stem is by two
The drill pipe nipple composition of tool joint and multiple head and the tail connection therebetween, pipe nipple be equipped with the button mechanism longitudinally extended and with
Its Chi Tao mechanism being flexibly connected.This two patents of invention are all to form cating nipple by driving cog, to realize that itself is curved
Stress concentration drops in bent and transmitting torque, and multiple pipe nipple bendings, which are superimposed, can be achieved ultra-short radius side direction horizontal well drilling.
205977123 U of Chinese utility model patent CN discloses a kind of drilling rod pulled out for soil layer and rock stratum anchor cable
Flexible joint, be assembled by outer bulb, interior ball-joint and pin shaft, it can be achieved that between adjacent two drilling rods angle adjustment, be convenient for
Drilling rod is crept into along anchor cable direction.207161005 U of Chinese utility model patent CN discloses one kind for petroleum, coal mine and surveys
The flex-stem of spy is made of the spline of ball seat, bulb and transmitting torque between the two, can suitably be subtracted by the swing of bulb
The turning radius of small directional well inclination section.Chinese utility model patent CN2711369Y discloses one kind by multiple universal ball joints
The double-walled flex-stem being composed in series, inner tube include the seamless steel pipe for being cased with the movable parts such as annular bearing runway and positioning pin, are used
Carry out circulating mud, outer tube be can free bend tube-like envelope.
201546638 U of Chinese utility model patent CN processes a stress-relief groove in outer thread root, this is mechanical
The method of industry one common drop stress concentration.202228002 U of Chinese utility model patent CN is common " Double Tops "
Structure increases contact segment length, is conducive to improve stress concentration phenomenon.But when drill pipe buckling is excessive, external screw thread root is still
It can be broken, and fracture position is uncontrollable, not solve breakage problem inherently.
In conclusion existing disclosed flex-stem, mostly uses greatly the mode of pin transmission, key transmission or ball transmission, structure
Complexity, vulnerable part is various, and interchangeability is bad；Or the measure of drop stress concentration is taken, but all public without inherently solving
Joint breaking problem.Pin end is once be broken, and the connection between drilling rod is failed immediately, and drilling rod will fall in drilling.Therefore urgently
A kind of effective method is needed, solves the problems, such as " to fall to bore " caused by fillet of tool joint pins root is frequently broken, drops this increasing for drilling project
Effect provides technical support.
For this purpose, designer of the invention, in view of drawbacks described above, by concentrating on studies and designing, synthesis is engaged in for many years for a long time
The experience and achievement of related industry, researching and designing go out a kind of bionical pin end and its manufacturing procedure with spine structure characteristic,
To overcome drawbacks described above.Animal backbone is made of vertebrae and interverbebral disc, and is connected by elastic cartilage with ligament, is a kind of
Quite it is soft again can movable structure, it is characterized in that: vertebrae and the mutually chimeric structure of interverbebral disc, and there is bullet between the two
Property cartilage and ligament etc. are flexible coupling in the circumferential direction.Therefore bionics the relevant technologies are used, the structure of animal backbone is special
Property apply in the design of fillet of tool joint pins structure, with " fall bore " problem caused by solving after fillet of tool joint pins fracture.
Summary of the invention
The purpose of the present invention is to provide a kind of bionical pin ends and its manufacturing procedure with spine structure characteristic, create
Property pin end torsion pass function and linkage function are separated, after realizing pin end torsion pass disabler, linkage function does not fail,
On business " fall to bore " problem caused by joint breaking to thoroughly solve drilling rod.
To solve the above problems, the invention discloses a kind of bionical pin end with spine structure characteristic, including torsion pass
End, connecting pin and cushion, it is characterised in that:
It is mutually fitted into and can separate but cannot take off comprising being formed once secondary cut between the torsion pass end and connecting pin
The fitting connection structure opened, connecting pin be used for pin end and female connector threaded connection, the cushion be located at torsion pass end and
With the micro-deformation for absorbing drilling rod in fitting connection structure between connecting pin, and layer is destroyed as pre-, realizes pin end
Fracture of root position to controllable position from changing at random, to form the elastic cartilage of imitative backbone and the flexible structure of ligament.
Wherein: the secondary cut is after cutting forms pin end by circumferentially being carried out to pin end again according to cutting
Path is cut to be cut, and the cutting slit of cutting path at it is mutually chimeric and can separate but the torsion pass end that cannot disengage with connect
Fitting connection structure between end, the fitting connection structure are petal-shaped structure, Linear arc-shaped structure or tangent circle camber
Structure, the petal-shaped structure are corresponding chimeric continuous petal-shaped protrusion and petal-shaped groove, the Linear arc-shaped structure
End comprising one of them is straight line and the setting of arc groove interval and another end is corresponding straight line and circular arc protrusion
Interval setting, and the arc groove and the arc angle of circular arc protrusion are greater than 180 degree, the tangent circle arc type structure is corresponding chimeric
Straight line and two continuous reversed semi arch intervals settings.
Wherein: the fitting connection structure is located at the button of fillet of tool joint pins thread root first between the 4th button.
Wherein: between torsion pass end and connecting pin be equipped with interlude, the both ends of the interlude be separately connected torsion pass end with
Connecting pin, and between interlude and torsion pass end and interlude and connecting pin be pin end formed through secondary cut it is mutually embedding
The fitting connection structure for closing and capable of separating but cannot disengaging, cushion are two and are located in two fitting connection structures.
Wherein: the width of the cutting seam is between 1mm-6mm.
Wherein: the cushion fills cutting slit at alloy yield strength is between joint material by diecasting alloys
Between 50-80%, elongation percentage is not less than joint material, and elasticity modulus, can in stress between the 40-60% of joint material
Bear certain compression and stretcher strain.
Also disclose a kind of manufacturing procedure of bionical pin end with spine structure characteristic, it is characterised in that comprising as follows
Step:
Firstly, carrying out blanking, the preliminary shape of pin end is formed by roughing and modifier treatment；
Secondly, circumferentially cutting formation in pin end appropriate location is fitting to connection structure；
Again, die casting ormolu is stitched to the cutting for being fitting to connection structure and form cushion；
Then, turning and screw thread finishing are carried out；
Finally, carrying out Nitrizing Treatment, joint surface hardness and wear-resisting property are improved.
By above structure it is found that the bionical pin end and its manufacturing procedure with spine structure characteristic of the invention, from
Bionics angle is set out, and the new approaches of " defeating a force with a tenderness " are proposed, i.e., by pin end root easy fracture position, is initially switched off first,
Cushion is refilled, so that the flexible structure that similar backbone has elastic cartilage and ligament is formed, creatively by pin end
Torsion pass function and linkage function separate, and have overturned the cognition at present to threaded connection safety is improved.The present invention solves other
" falling to bore " problem that patent does not solve, has the advantages that
1, because of the presence of bionical pin end cushion, certain deformation can be effectively absorbed, improves pin end thread root
Stress state, avoid pin end Root Stress concentrate, to reduce the generation of pin end fracture accident.
2, it is consistent with drill pipe buckling direction to realize cushion Impact direction, and become with drill pipe buckling direction change
Change.
3, when drill pipe buckling deformation reaches a certain level, when pin end Root Stress is excessive, because of cushion mechanical property
Lower than public access head material, so cushion is firstly broken, it is thus achieved that pin end fracture position is from random to fixed bit
The transformation set.
4, bionical pin end torsion pass function and linkage function separate, after torque transmission capacity failure, but the connection function between drilling rod
It can not fail, drilling rod can all be proposed outside hole, thoroughly solve to lead because of drill rod breaking by drilling rod tensile strength still with higher
" falling to bore " problem caused.
Detailed content of the invention can be obtained by aftermentioned explanation and institute's attached drawing.
Detailed description of the invention
Fig. 1 shows the connection schematic diagram of the bionical pin end and female connector with spine structure characteristic of the invention.
Fig. 2 shows in the present invention the wherein decomposition diagram of an embodiment.
Fig. 3 shows the schematic diagram of another embodiment in the present invention.
Fig. 4 shows the schematic diagram in the present invention without cushion.
Fig. 5 a to Fig. 5 c respectively illustrates present invention cutting path schematic diagram of different shapes.
Fig. 6 shows that 3 petal-shaped structural units of the present invention are evenly arranged schematic diagram in the present invention.
Fig. 7 shows that the present invention 4 straight lines-circular arc type structural unit is evenly arranged schematic diagram in the present invention.
Fig. 8 shows that 5 tangent circle camber structural units of the present invention are evenly arranged schematic diagram in the present invention.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the present invention more clear, with the following Examples, the present invention is made
It is further described.Described herein the specific embodiments are only for explaining the present invention, is not intended to limit the present invention.It is based on
Embodiment in the application, those skilled in the art without making creative work, it is obtained its
His embodiment, all should belong to protection scope of the present invention.
Referring to Fig. 1, it is shown that the connection signal of the bionical pin end and female connector with spine structure characteristic of the invention
Figure.
The bionical pin end with spine structure characteristic includes torsion pass end 1, connecting pin 2 and buffering between the two
Bed course 3 forms the similar elastic cartilage of backbone and the structure of ligament；Comprising once secondary between the torsion pass end 1 and connecting pin 2
It cuts and forms fitting connection structure that is mutually chimeric and can separating but cannot disengage, be mainly used for the sealing and transmitting torsion of connector
Square, connecting pin 2 are mainly used for the threaded connection of pin end and female connector, and the cushion 3 is located at torsion pass end and connecting pin
Between fitting connection structure in, be mainly used for absorbing the micro-deformation of drilling rod, and destroy layer as pre-, realize pin end root
Fracture position to controllable position from changing at random.
Referring to fig. 2, the secondary cut be after cutting forms pin end by pin end is circumferentially carried out again by
It is cut according to cutting path, and the cutting slit of cutting path is at torsion pass end 1 that is mutually chimeric and can separating but cannot disengage
Fitting connection structure between connecting pin 2, to realize this connection relationship, the path of secondary cut can be Fig. 5 a to Fig. 5 c
Petal-shaped structure, Linear arc-shaped structure, tangent circle arc type structure for showing etc., as shown in Figure 5 a, the petal-shaped structure is
The end of torsion pass end 1 and connecting pin 2 is corresponding chimeric continuous petal-shaped raised and petal-shaped groove, as shown in Figure 5 b, described
It is straight line and the setting of arc groove interval and another that Linear arc-shaped structure, which includes one of them end of torsion pass end 1 and connecting pin 2,
One end is that corresponding straight line and circular arc bulge clearance are arranged, and the arc groove and the arc angle of circular arc protrusion are greater than 180
Degree, to realize effect that is mutually chimeric and can separating but cannot disengage, as shown in Figure 5 c, the tangent circle arc type structure is to pass
The end for turning round end 1 and connecting pin 2 is corresponding chimeric straight line and two continuous reversed semi arch interval settings.
Wherein, in embodiment illustrated in fig. 2, the fitting connection structure is preferably placed at the button of fillet of tool joint pins thread root first
To between the 4th button；When fillet of tool joint pins size is larger, when especially screw thread is longer, settable another fitting connection structure
(as shown in Figure 3) is equipped with interlude 4 that is, between torsion pass end 1 and connecting pin 2, and the both ends of the interlude 4 are separately connected torsion pass
End 1 and connecting pin 2, and between interlude 4 and torsion pass end 1 and interlude 4 and connecting pin 2 be pin end through secondary cut and
Form fitting connection structure that is mutually chimeric and can separate but cannot disengage, cushion 3 is two and is located at two and is fitted into
In connection structure, it is preferred that interlude 4 may also be configured to split type, can also be equipped be fitting to connection structure and slow between each other
Rush bed course 3, and the spacing between two or more pieces cushion is answered close, and different cushions should be avoided and be located at same screw thread
It buckles.
The structures lists such as petal-shaped structure, Linear arc-shaped structure, tangent circle arc type structure in the fitting connection structure
Member is distributed on fillet of tool joint pins circumference, and when using being evenly arranged, mutually chimeric element number is not less than 3 (referring to Fig. 6
To shown in Fig. 8)；When using nonuniform mutation operator, quantity is not less than 2.
The width of the cutting seam is preferable between 1mm-4mm, and when fillet of tool joint pins size is larger, can suitably it increase
Cutting slit width degree, but no more than 6mm.
The cushion 3 fills cutting slit at alloy yield strength should be between the 50- of joint material by diecasting alloys
Between 80%, elongation percentage is not less than joint material, and elasticity modulus is between the 40-60% of joint material, in stress Shi Kecheng
By certain compression and stretcher strain.
Certainly, in the embodiment shown in fig. 4, if cutting slit width degree is not more than 0.05mm, cushion can be cancelled；Work as brill
It when bar public access area of bed is larger, can suitably increase cutting slit width degree, cancel the width for cutting seam in the structure of cushion but not
Preferably more than 0.5mm.
In the embodiment depicted in figure 2, the Φ for being 3 with the structural unit containing a cushion 3 and petal-shaped structure
Illustrate specific manufacturing procedure of the invention for the bionical pin end of 89mm.
Firstly, carrying out blanking, by processes such as roughing and modifier treatment, the preliminary shape of Φ 89mm pin end is formed.
Secondly, at pin end appropriate location (between the button of root one to three of design screw thread), circumferentially there are three for cutting tool
The petal-shaped structure of even distributed architecture unit, cutter head, which is placed in connector hollow pipe, in cutting process does linear movement, connector itself
It is rotated with setting speed, cutting gap 2mm；Pin end is divided into front and back two parts by cutting track, and front is used to process screw thread,
Rear portion is used for and drill rod body friction welding；Three groups of opposite structural units of opening direction join end to end, and are uniformly surrounded on connector,
And it is mutually chimeric between petal design, it cannot be completely disengaged；Cutter rail mark is as shown in Figure 5 a in the projection of plane.
Again, die casting ormolu (brass) is stitched to cutting, die casting pressure is about 25-30MPa, forms cushion after cooling
Layer, the yield strength of cushion brass are about 400MPa, and elongation percentage is not less than 13%, and elasticity modulus is about 95GPa, can by
Certain compression and stretcher strain are born when power, play buffer function.
Then, turning and screw thread finishing are carried out, cushion is in the button of pin end thread root first to third button
Between, form the bionical pin end of petal-shaped of spine structure characteristic；Screw thread basic parameter remains unchanged, hereby it is ensured that joint
Leakproofness, tension resistance performance and torsion pass performance.
Finally, carrying out Nitrizing Treatment, joint surface hardness and wear-resisting property are improved；Bionical pin end, female connector respectively with
The processing of single drill pipe is completed in body of rod friction welding after vehicle overlap.
When drilling rod is used for bore operation, axial load and lateral moment of flexure increase, and will increase the stress of pin end first, because
Bionical pin end has spined architectural characteristic, and the presence of cushion absorbs micro bending, promotes pin end uniform load point
Cloth avoids fillet of tool joint pins stress from concentrating and be broken to reduce the stress concentration effect of male thread root.Bionical connector is
The non-package assembly of integral type has many advantages, such as that structure is simple, is easily worked, wearability is good, highly reliable.
In the embodiment shown in fig. 3, there are 4 structural units containing two cushions and Linear arc-shaped structure
Illustrate another embodiment of the invention for the bionical pin end of Φ 127mm.
Firstly, carrying out blanking, by processes such as roughing and modifier treatment, the preliminary shape of Φ 127mm pin end is formed.
Secondly, pin end appropriate location (design screw thread root one to three button between six to eight button between) circumferentially
Two gaps are cut, every gap includes four equally distributed structural units of Straight Line and Arc structure, cutter head in cutting process
It is placed in connector hollow pipe and does linear movement, connector itself is rotated with setting speed, cutting gap 3mm；Cutting track will be public
Connector is divided into torsion pass end, interlude and connecting pin three parts, and front and middle part are for processing screw thread, and rear portion is used for and drill rod body
Friction welding；Circular arc opening is joined end to end by straight line towards connection extreme direction, is uniformly surrounded on connector, and three parts are mutually embedding
It closes, it cannot be completely disengaged；Single cutting track is as shown in Figure 5 b in the projection of plane.
Again, to two cutting seam difference press casting copper alloys, die casting pressure is about 25-30MPa, forms cushion after cooling
Layer, the yield strength of cushion copper alloy are about 550MPa, and elongation percentage is not less than 15%, and elasticity modulus is about 145GPa, can
Certain compression and stretcher strain are born in stress, play buffer function.
Then, turning and screw thread finishing are carried out, two cushions are respectively at the button of pin end thread root first
To between third button and the 6th to the 8th button, the bionical pin end of straight line-arc structure with spine structure characteristic is formed；Screw thread
Basic parameter remains unchanged, hereby it is ensured that the leakproofness of joint, tension resistance performance and torsion pass performance.
Finally, carrying out Nitrizing Treatment, joint surface hardness and wear-resisting property are improved；Bionical pin end, female connector respectively with
The processing of single drill pipe is completed in body of rod friction welding after vehicle overlap.
When drill rod thread size is larger, two cushions are set, the deflection of pin end can be increased, and are buffered
Bed course is equivalent to one " dam ", and concentrating to stress to thread root has dispersion and barrier effect, so cushion is rationally arranged
Layer solves the problems, such as male thread fracture of root it is possible to prevente effectively from bending stress is concentrated to thread root.
It is readily apparent that above description and record is only illustrated in the disclosure being not intended to be limiting of the invention
Appearance, application or use.Although describing and being described in the accompanying drawings embodiment in embodiment, the present invention is not limited
Be described as by attached drawing example and in embodiment it is now recognized that optimal mode to implement the particular case of the teachings of the present invention
Son, the scope of the present invention will include any embodiment for falling into the description and appended claims of front.
Claims (7)
1. a kind of bionical pin end with spine structure characteristic, including torsion pass end, connecting pin and cushion, feature exist
In:
It include to be formed mutually to be fitted into and can separate but cannot disengage once secondary cut between the torsion pass end and connecting pin
Be fitting to connection structure, connecting pin be used for pin end and female connector threaded connection, the cushion be located at torsion pass end with connect
With the micro-deformation for absorbing drilling rod in fitting connection structure between end, and layer is destroyed as pre-, realizes pin end root
Fracture position to controllable position from changing at random, to form the elastic cartilage of imitative backbone and the flexible structure of ligament.
2. as described in claim 1 with the bionical pin end of spine structure characteristic, it is characterised in that: the secondary cut is
By circumferentially carrying out cutting again according to cutting path to pin end after cutting forms pin end, and cutting path
Cutting slit is described embedding at mutually chimeric and can separate but fitting connection structure between the torsion pass end that cannot be disengaged and connecting pin
Conjunction connection structure is petal-shaped structure, Linear arc-shaped structure or tangent circle arc type structure, and the petal-shaped structure is that correspondence is embedding
The continuous petal-shaped protrusion closed and petal-shaped groove, the Linear arc-shaped structure include that the end of one of them is straight line and circle
The setting of arc slot interval and another end are that corresponding straight line and circular arc bulge clearance are arranged, and the arc groove and circular arc are raised
Arc angle be greater than 180 degree, the tangent circle arc type structure be the corresponding straight line and two continuous reversed semi arches being fitted into
Interval setting.
3. as described in claim 1 with the bionical pin end of spine structure characteristic, it is characterised in that: the fitting connection knot
Structure is located at the button of fillet of tool joint pins thread root first between the 4th button.
4. as described in claim 1 with the bionical pin end of spine structure characteristic, it is characterised in that: in torsion pass end and connection
Interlude is equipped between end, the both ends of the interlude are separately connected torsion pass end and connecting pin, and interlude and torsion pass end and
It is that pin end forms mutually chimeric through secondary cut and can separate but cannot disengage chimeric between interlude and connecting pin
Connection structure, cushion are two and are located in two fitting connection structures.
5. as described in claim 1 with the bionical pin end of spine structure characteristic, it is characterised in that: the width of the cutting seam
Degree is between 1mm-6mm.
6. as described in claim 1 with spine structure characteristic bionical pin end, it is characterised in that: the cushion by
Diecasting alloys filling cutting slit is at for alloy yield strength between the 50-80% of joint material, elongation percentage is not less than connector
Material, elasticity modulus can bear certain compression and stretcher strain in stress between the 40-60% of joint material.
7. a kind of manufacturing procedure of the bionical pin end with spine structure characteristic as described in any in claim 1 to 6,
It is characterized in that comprising the following steps:
Firstly, carrying out blanking, the preliminary shape of pin end is formed by roughing and modifier treatment；
Secondly, circumferentially cutting formation in pin end appropriate location is fitting to connection structure；
Again, die casting ormolu is stitched to the cutting for being fitting to connection structure and form cushion；
Then, turning and screw thread finishing are carried out；
Finally, carrying out Nitrizing Treatment, joint surface hardness and wear-resisting property are improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910262019.6A CN109944557B (en) | 2019-04-02 | 2019-04-02 | Bionic male connector with structural characteristics of spine and processing procedure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910262019.6A CN109944557B (en) | 2019-04-02 | 2019-04-02 | Bionic male connector with structural characteristics of spine and processing procedure thereof |
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| Publication Number | Publication Date |
|---|---|
| CN109944557A true CN109944557A (en) | 2019-06-28 |
| CN109944557B CN109944557B (en) | 2020-07-10 |
Family
ID=67012476
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910262019.6A Active CN109944557B (en) | 2019-04-02 | 2019-04-02 | Bionic male connector with structural characteristics of spine and processing procedure thereof |
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| CN (1) | CN109944557B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111119753A (en) * | 2020-02-25 | 2020-05-08 | 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 |
| CN115008139A (en) * | 2022-06-29 | 2022-09-06 | 中煤科工集团重庆研究院有限公司 | Machining process of mining active drill rod male joint |
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| US3939670A (en) * | 1974-06-12 | 1976-02-24 | Chicago Pneumatic Tool Company | Rotatable drill string having a torsionally elastic shaft driving connection with rock bit |
| CN2722015Y (en) * | 2004-08-31 | 2005-08-31 | 常州宝硕宏图塑胶有限公司 | Bell mouth joint associated with elastic sealing ring connection |
| CN202866670U (en) * | 2012-09-14 | 2013-04-10 | 吉林大学 | Wear-resisting weak abrasiveness bionic tool joint |
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| CN111119753A (en) * | 2020-02-25 | 2020-05-08 | 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 |
| CN115008139A (en) * | 2022-06-29 | 2022-09-06 | 中煤科工集团重庆研究院有限公司 | Machining process of mining active drill rod male joint |
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| Publication number | Publication date |
|---|---|
| CN109944557B (en) | 2020-07-10 |
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