CN202970517U - Drill pipe of rotary drilling rig - Google Patents
Drill pipe of rotary drilling rig Download PDFInfo
- Publication number
- CN202970517U CN202970517U CN 201220730844 CN201220730844U CN202970517U CN 202970517 U CN202970517 U CN 202970517U CN 201220730844 CN201220730844 CN 201220730844 CN 201220730844 U CN201220730844 U CN 201220730844U CN 202970517 U CN202970517 U CN 202970517U
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- internal key
- rod tube
- wear
- resistant sleeve
- section rod
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Abstract
The utility model discloses a drill pipe of a rotary drilling rig. The drill pipe of the rotary drilling rig comprises multi-section section rod tubes (1) and abrasion resistant sleeves (6) in a round sleeve shape. Each abrasion resistant sleeve is fixedly connected with the bottom end (11) of each section rod tube (1). A plurality of internal key boards (9) are evenly and fixedly arranged at intervals on the inner wall of the bottom end. An internal key groove (91) is formed between two adjacent internal key boards. An abrasion resistant sleeve key groove (61) opposite to each internal key groove and a step portion (62) opposite to each internal key board (9) are formed on the inner wall of each abrasion resistant sleeve (6). Each step portion (62) is fixedly connected with the bottom end of each internal key board (9) in a supporting mode. Due to arrangement of the abrasion resistant sleeves, abrasion performance is greatly strengthened. A welded connection mode and the like are adopted by the abrasion resistant sleeves, a fusion welding mode is adopted so that the abrasion resistant sleeves are replaced as needed, maintenance is convenient and maintenance cost is low. The bottom end of each section rod tube is not abraded in a tooth shape, and structure fastness of an internal key groove structure is protected.
Description
Technical field
The utility model relates to a kind of drilling machine drilling rod.
Background technology
Drilling machine drilling rod used in the prior art mostly is scalable drilling rod, and the capable of adjusting drilling pole length is to adapt to the punching degree of depth.Scalable drilling rod is by more piece section rod tube layer overlaps and clamping, and the key bar of internal layer section rod tube matches with the keyway of outer section rod tube, rotates transferring power by unit head and carries out drilling and forming hole.
Wherein, the key bar on the internal layer section rod tube can directly weld, but the internal keyway structure of outer section rod tube can be by various ways.As shown in Figure 1, a kind of common frame mode is three internal keies 2 that welding is formed by internal key bar 4 and arc plate 5 weldings on the inwall of outer section rod tube 1, to form the trisection keyway on inwall.The shortcoming of this structure is that welding performance is poor, and weld seam is many, easily produces welding deformation.Internal key bar 4 is fixedly welded on the inwall of section rod tube 1 by the side weld seam of keyway both sides, and it is larger that this side weld seam bears torsion, and very easily weares and teares between the key bar of internal layer section rod tube, causes internal key bar 4 to come off, and causes kelly, band bar even to pound the bar accident.And as the pressurized operation face, its material rigidity with respect to internal key bar 4 is not enough due to the body of outer section rod tube 1 bottom, and wearing and tearing are than very fast.Like this, cause the wearing and tearing inequality of body bottom, rough " age of a draught animal " easily occur, can cause machine locking bar release difficulty, even cause the band bar to pound bar.
For avoiding wearing and tearing to produce " age of a draught animal " and formation internal keyway structure, as shown in Figure 2, another frame mode is to adopt integral drive cover 3, this integral drive cover 3 is welded in the bottom of outer section rod tube 1.Notice of authorization number directly carries out the inner surface machining to form internal keyway for namely disclosing this kind integral drive cover in the patent of CN2804361Y in the integral drive cover, then actuating sleeve is welded to an end of outer section rod tube.This integral drive cover 3 can adopt high strength steel to strengthen anti-wear performance, avoids the stress surface of internal keyway serious because of fatigue damage, wear-resistant, slip-off preventing, can increase the service life.In integral drive cover as shown in Figure 1, generally adopt the high-strength steel modifier treatment, rigidity is large, can guarantee the anti-wear performance of the work plane (being dash area in Fig. 1) of internal keyway both sides.But, on drilling rod whole stressed, wish that not only the work plane of internal keyway both sides has enough abrasion resistancies, wish also that simultaneously driving key cover itself will have enough elasticity.Integral drive key cover integral rigidity is larger, and at first the internal key plate easily forms stress and concentrates in the use procedure of drilling rod, and fatigue cracking occurs prematurely, affects the application life of drilling rod.Simultaneously, after drilling rod overhang large (for example more than 40m), produce axial certain bending deformation quantity under the effect of the axial force that drilling rod on the whole can be when boring.At this moment, because the rigidity of integral drive cover 3 is large, itself and outer section rod tube 1(are generally the lower 16Mn material of relative stiffness) the end between the attachment weld place become stressed weak link.Thereby easily cause above-mentioned attachment weld cracking, making needs to change whole integral drive cover 3.And integral drive cover 3 adopts 40Cr or 40CrMo material usually and through modifier treatment, integral replacing expensive.
The utility model content
For the defective that exists in above-mentioned prior art and deficiency, the utility model provides a kind of drilling machine drilling rod, and the anti-wear performance of the section rod tube of this drilling rod is strong, maintains easily.
To achieve these goals, the utility model provides a kind of drilling machine drilling rod, this drilling rod comprises the more piece section rod tube of socket vertically, in two adjacent joint joint rod tubes, be formed with internal keyway on the bottom inwall of outer field section rod tube, be formed with the external key bar that matches with described internal keyway on the outer wall of the section rod tube of internal layer, wherein, this drilling rod also comprises the wear-resistant sleeve of round buss shape, and described wear-resistant sleeve is fixedly connected on the bottom of described outer field section rod tube.
Preferably, be installed with a plurality of internal key plates that even distribution and interval arrange on the inwall of the bottom of described outer field section rod tube, form described internal keyway between adjacent described internal key plate, be formed with the wear-resistant sleeve keyway relative with described internal keyway position and the stage portion relative with described internal key Board position on the inwall of described wear-resistant sleeve, this stage portion supports and is fixedly connected on the bottom of described internal key plate.
Preferably, the tip edge of described wear-resistant sleeve is welded in the bottom edge of described outer field section rod tube, described stage portion is formed on the inwall of bottom part of described wear-resistant sleeve, described stage portion is alignd with the internal key plate respectively, and the tip edge of described stage portion is welded in the bottom edge of described internal key plate.
Preferably, described internal key plate stretches out from the bottom of described outer field section rod tube, and the connecting portion between the connecting portion between described wear-resistant sleeve and described internal key plate and described wear-resistant sleeve and described outer field section rod tube is along mutually staggering on the axial direction of described drilling rod.
Preferably, the wall thickness that described wear-resistant sleeve is provided with described stage portion place equals the wall thickness sum of wall thickness and the described internal key plate of described outer field section rod tube, it is concordant with the inner surface of described internal key plate that described wear-resistant sleeve is provided with the inner surface at described stage portion place, and the inner surface that described wear-resistant sleeve is provided with described wear-resistant sleeve keyway place is concordant with described internal keyway surface.
Preferably, described section rod tube is the 16Mn steel pipe, and described internal key plate is 40Cr steel plate or 40CrMo steel plate.
Preferably, the length of described internal key plate is not less than 700mm, and the length of described wear-resistant sleeve is not more than 200mm.
Preferably, the installed position corresponding to described internal key plate on the outer wall of above-mentioned outer field section rod tube is provided with through hole, and described internal key plate is by described through hole and described section rod tube plug welding welding.
Preferably, described through hole forms the circumferential long hole shape along described outer field section rod tube, and described through hole is a plurality of and arranges along the axially spaced-apart of described section rod tube.
according to drilling machine drilling rod of the present utility model, the wear-resistant sleeve of round buss shape is set by the bottom at section rod tube, greatly strengthened anti-wear performance.Wear-resistant sleeve can adopt the mode such as be welded to connect, and adopts melting welding to change when needs are changed and gets final product, maintain easily and maintenance cost low.After adopting wear-resistant sleeve, can not regrind and damage into " age of a draught animal " shape in the bottom of section rod tube, protected the structure fixing of internal keyway structure.
Other feature and advantage of the present utility model will partly be described in detail in the specific embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide further understanding of the present utility model, and consists of the part of manual, is used from explanation the utility model with the following specific embodiment one, but does not consist of restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the employing internal key bar of prior art and the structural representation that arc plate consists of the section rod tube of internal keyway structure;
Fig. 2 is the structural representation of the section rod tube of available technology adopting integral drive cover;
Fig. 3 is the structural representation according to the drilling machine drilling rod of preferred embodiment of the present utility model;
Fig. 4 is the partial schematic sectional view of the section rod tube in drilling machine drilling rod shown in Figure 3;
Fig. 5 is the front view of section rod tube shown in Figure 4;
Fig. 6 is the enlarged drawing of the circle part in Fig. 4;
Fig. 7 is the upward view of section rod tube shown in Figure 4.
Description of reference numerals
1 section rod tube 2 keyways
3 integral drive cover 4 internal key bars
5 arc plate 6 wear-resistant sleeves
7 external key bar 8 through holes
9 internal key plate 10 weld seams
20 elevator connector 30 bufferings support
The 40 interior bar square toes of Compress Spring 50
The bottom 61 wear-resistant sleeve keyways of 11 section rod tubes
62 stage portion 91 internal keywaies
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is elaborated.Should be understood that, the specific embodiment described herein only is used for description and interpretation the utility model, is not limited to the utility model.
In the utility model, in the situation that do opposite explanation, the noun of locality of use as " upper and lower, top, the end " normally for direction shown in the drawings or for vertically, each parts mutual alignment relationship description word on vertical or gravity direction.
To shown in Figure 7, the utility model provides a kind of drilling machine drilling rod as Fig. 3, and this drilling rod comprises elevator connector 20, buffering support 30, the more piece section rod tube 1 of layer overlaps and Compress Spring 40 and the interior bar square toes 50 of below from top to bottom.Wherein, be provided with wear-resistant sleeve between adjacent internal layer section rod tube and outer section rod tube, i.e. as shown in Figure 4 the wear-resistant sleeve 6 of round buss shape, this wear-resistant sleeve 6 is fixedly connected on the bottom 11 of outer field section rod tube 1, be formed with internal keyway 91 as shown in Figure 4 in this bottom 11, this internal keyway 91 be used for adjacent internal layer section rod tube 1 outer wall on external key bar 7 coordinate transmission.The utility model can make the bottom 11 of outer section rod tube 1 no longer produce aforesaid " age of a draught animal " phenomenon by wear-resistant sleeve 6 is set, but after producing certain wearing and tearing integral replacing.Wear-resistant sleeve 6 can be welded to the bottom 11 of outer field section rod tube 1 simply, when needs are changed, disassemble by the melting welding mode and get final product, certainly, those skilled in the art will be understood that and can adopt more kinds of other detachably to be fixedly connected with mode, such as the mode etc. that is spirally connected by middle connecting plate.Wear-resistant sleeve 6 can make to strengthen polishing machine by high-abrasive material, wear-resistant sleeve 6 also can have certain bending resistance having on the basis of certain rigidity, thereby stretch out long and produce certain fixing that can not affect the syndeton between wear-resistant sleeve 6 and outer section rod tube 1 when crooked under responsive to axial force at drilling rod, and wear-resistant sleeve 6 can be designed in axial length little, with the impact of this flexural deformation of further weakening on syndeton.In addition, also protected by arranging wear-resisting 6 the internal keyway structure that forms described internal keyway 91, be convenient to the fixing design of its structure, below will describe in detail.
As previously mentioned, employing has corresponding fault of construction as Fig. 1 or internal keyway structure shown in Figure 2.In addition, notice of authorization number also discloses another kind of frame mode in the patent of CN201687401U, namely directly processes three internal keywaies on the inwall of outer section rod tube.Yet because this internal keyway that processes need to be along the whole axial length processing of outer section rod tube, forming vertical keyway, thereby difficult processing, the production cycle is long, processing cost is higher.Therefore, be to guarantee rigidity and the structure fixing of internal keyway structure, be adapted to install the design feature of the section rod tube 1 after wear-resistant sleeve 6, be convenient to processing and manufacturing, installation and replacing, as shown in Figure 4, preferably adopt a plurality of internal key plates 9 to form described internal keyway structure in present embodiment.Internal key plate 9 can be designed to have stronger rigidity with wear-resistant and torque resistant, and can strengthen the bonding strength between internal key plate 9 and outer section rod tube 1, the not firm situation of syndeton so that between the external key bar 7 that prevents internal key plate 9 and adjacent internal layer section rod tube, bonding is stressed produces.
After wear-resistant sleeve 6 is set, can strengthen the fixing of internal key plate 9.Particularly, as extremely shown in Figure 7 in Fig. 4, a plurality of internal key plate 9(that preferably are installed with the setting of even distribution and interval on the inwall of the bottom 11 of outer section rod tube 1 are generally three internal key plates to form three internal keywaies), form above-mentioned internal keyway 91 between adjacent internal key plate 9.Correspondingly be formed with the wear-resistant sleeve keyway 61 relative with internal keyway 91 positions and the stage portion 62 relative with internal key plate 9 positions on the inwall of wear-resistant sleeve 6, this stage portion 62 supports and is fixedly connected on the bottom of internal key plate 9.Like this, internal key plate 9 not only can be fixedly connected with the inwall of outer section rod tube 1, but also pressure-bearing is connected on wear-resistant sleeve 6, makes installation more firm.
Wherein, as shown in Figure 5 and Figure 6, the tip edge of wear-resistant sleeve 6 outside wall surface can be welded in 11 edges, bottom of section rod tube 1, the stage portion 62 of wear-resistant sleeve 6 inwalls can be formed on the inwall of bottom part of wear-resistant sleeve 6, stage portion 62 is alignd with internal key plate 9 respectively, and the tip edge of stage portion 62 is preferably the bottom edge that is welded in internal key plate 9.Be that internal key plate 9 stretches out from the bottom 11 of section rod tube 1 or the stage portion 62 of wear-resistant sleeve 6 stretches in section rod tube 1, then carry out inside and outside twice annulus welding, i.e. twice weld seam 10 shown in Figure 6.In a word, make connecting portion between wear-resistant sleeve 6 and internal key plate 9 and the connecting portion between wear-resistant sleeve 6 and outer section rod tube 1 along mutually staggering on the axial direction of drilling rod.This shape and the welded construction of wear-resistant sleeve 6 can be strengthened the bonding strength of internal key plate 9, and wear-resistant sleeve 6 is by inside and outside twice weld seam 10, connect firm and conveniently change in the melting welding mode.As shown in Figure 4, in present embodiment, internal key plate 9 is preferably from the bottom 11 of outer section rod tube 1 and stretches out, and the height of stage portion 62 is less than the tip edge of wear-resistant sleeve 6 outer walls.This is because the relative stiffness of internal key plate 9 is larger, can play the effect of stiffener under this structure, increases structural strength.
In addition, the wall thickness that wear-resistant sleeve 6 is provided with stage portion 62 places equals the wall thickness sum of wall thickness and the internal key plate 9 of outer section rod tube 1, it is concordant with the inner surface of internal key plate 9 that wear-resistant sleeve 6 is provided with the inner surface at stage portion 62 places, and the inner surface that wear-resistant sleeve 6 is provided with wear-resistant sleeve keyway 61 places is concordant with internal keyway 91 surfaces.This Thickness Design is convenient to the welding operation between wear-resistant sleeve 6 and internal key plate 9, more can play the effect of supporting internal key plate 9.When being connected between internal layer section rod tube and outer section rod tube, the stage portion 62 of wear-resistant sleeve 6 matches with the internal layer section rod tube, can play guide effect, and the axially loaded face when work is maximum, the stressed minimum of unit area.In addition, internal layer and outer field section rod tube 1 are the 16Mn steel pipe with certain elastic deformation ability usually, and correspondingly, internal key plate 9 preferably adopts 40Cr steel plate or the 40CrMo steel plate through modifier treatment, to strengthen abrasion resistance and rigidity.The employing rigidity greatly and after connecting firm internal key plate 9, the torsion transmission effect between internal key plate 9 and external key bar 7 is better, and is more not easy to wear.As shown in Figure 3, the section rod tube 1 of the part that mediates is the internal layer section rod tube for the section rod tube that the upper end connects, and is outer section rod tube for the section rod tube that the lower end connects.Therefore, as Fig. 5 or shown in Figure 7, the position corresponding to internal keyway 91 on the outer wall of internal layer section rod tube 1 also can be installed with external key bar 7, and this external key bar 7 is set to and can matches to conduct torsion by the internal keyway in adjacent outer section rod tube 1.As shown in Figure 7, because adjacent outer section rod tube 1 caliber is larger, the width of its internal keyway 91 is also larger, therefore the width of the external key bar 7 on the outer wall of internal layer section rod tube 1 gets larger than internal keyway 91 width designs on the inwall of this internal layer section rod tube 1, and for saving the material weight reduction, external key bar 7 can be made of the key bar that two intervals arrange.
For further strengthening the connection fixing of internal key plate 9, referring to Fig. 5, the installed position corresponding to internal key plate 9 on the outer wall of outer section rod tube 1 can be provided with through hole 8, and internal key plate 9 is by through hole 8 and outer section rod tube 1 plug welding welding.Preferably, through hole 8 forms the circumferential long hole shape along outer section rod tube 1, and through hole 8 is a plurality of and arranges along the axially spaced-apart of outer section rod tube 1.Like this, by multiple tracks plug welding welding, each internal key plate 9 is connected on the inwall of outer section rod tube 1 more firmly.
Compared to the whole cannelure that processes longitudinally in outer section rod tube 1, the Design of length of the internal key plate 9 in present embodiment is for being not less than 700mm, and three internal key plates 9 of the interior installation of whole section rod tube 1 get final product, and facilitate processing and manufacturing and can coordinate transmission with external key bar 7.Saved the high-strength steel material for integral drive cover 3, even internal key plate 9 comes off, overlapped with respect to integral drive that also cost is lower.The length of wear-resistant sleeve 6 is preferably and is not more than 200mm and gets final product, and the length of the cover of the integral drive in Fig. 23 is much larger than 200mm, this not only saves material but also in the situation that length is less, and the drill pipe buckling distortion that drilling rod stretches out when long affects less on the fixing of the syndeton between wear-resistant sleeve 6 and outer section rod tube 1.
To sum up, on the basis of adopting wear-resistant sleeve 6, replace integral drive cover 3 with a plurality of internal key plates 9, can make the internal keyway sound construction reliable, can prevent from using in the situation of integral drive cover 3 due to the drilling rod overhang and make being welded to connect fragility, holding caducous situation generation between actuating sleeve and outer section rod tube 1 under the flexural deformation effect when longer.
Below describe by reference to the accompanying drawings preferred embodiment of the present utility model in detail; but; the utility model is not limited to the detail in above-mentioned embodiment; in technical conceive scope of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.
Need to prove in addition, each concrete technical characterictic described in the above-mentioned specific embodiment in reconcilable situation, can make up by any suitable mode, for fear of unnecessary repetition, the utility model is to the explanation no longer separately of various possible combinations.
In addition, also can carry out any combination between various embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Claims (9)
1. drilling machine drilling rod, this drilling rod comprises the more piece section rod tube (1) of socket vertically, in two adjacent joint joint rod tubes (1), be formed with internal keyway (91) on bottom (11) inwall of outer field section rod tube (1), be formed with the external key bar (7) that matches with described internal keyway (91) on the outer wall of the section rod tube of internal layer (1), it is characterized in that, this drilling rod also comprises the wear-resistant sleeve (6) of round buss shape, and described wear-resistant sleeve (6) is fixedly connected on the bottom (11) of described outer field section rod tube (1).
2. drilling machine drilling rod according to claim 1, it is characterized in that, be installed with a plurality of internal key plates (9) that even distribution and interval arrange on the inwall of the bottom (11) of described outer field section rod tube (1), form described internal keyway (91) between adjacent described internal key plate (9), be formed with the wear-resistant sleeve keyway (61) relative with described internal keyway (91) position and the stage portion (62) relative with described internal key plate (9) position on the inwall of described wear-resistant sleeve (6), this stage portion (62) supports and is fixedly connected on the bottom of described internal key plate (9).
3. drilling machine drilling rod according to claim 2, it is characterized in that, the tip edge of described wear-resistant sleeve (6) is welded in the edge, bottom (11) of described outer field section rod tube (1), described stage portion (62) is formed on the inwall of bottom part of described wear-resistant sleeve (6), described stage portion (62) is alignd with internal key plate (9) respectively, and the tip edge of described stage portion (62) is welded in the bottom edge of described internal key plate (9).
4. drilling machine drilling rod according to claim 3, it is characterized in that, described internal key plate (9) stretches out from the bottom (11) of described outer field section rod tube (1), and the connecting portion between the connecting portion between described wear-resistant sleeve (6) and described internal key plate (9) and described wear-resistant sleeve (6) and described outer field section rod tube (1) is along mutually staggering on the axial direction of described drilling rod.
5. drilling machine drilling rod according to claim 2, it is characterized in that, described wear-resistant sleeve (6) is provided with the wall thickness sum that wall thickness that described stage portion (62) locates equals wall thickness and the described internal key plate (9) of described outer field section rod tube (1), it is concordant with the inner surface of described internal key plate (9) that described wear-resistant sleeve (6) is provided with the inner surface that described stage portion (62) locates, and it is concordant with described internal keyway (91) surface that described wear-resistant sleeve (6) is provided with inner surface that described wear-resistant sleeve keyway (61) locates.
6. drilling machine drilling rod according to claim 2, is characterized in that, described section rod tube (1) is the 16Mn steel pipe, and described internal key plate (9) is 40Cr steel plate or 40CrMo steel plate.
7. drilling machine drilling rod according to claim 2, is characterized in that, the length of described internal key plate (9) is not less than 700mm, and the length of described wear-resistant sleeve (6) is not more than 200mm.
8. the described drilling machine drilling rod of any one according to claim 2-7, it is characterized in that, installed position corresponding to described internal key plate (9) on the outer wall of described outer field section rod tube (1) is provided with through hole (8), and described internal key plate (9) is by described through hole (8) and described section rod tube (1) plug welding welding.
9. drilling machine drilling rod according to claim 8, it is characterized in that, described through hole (8) forms along the circumferential long hole shape of described outer field section rod tube (1), and described through hole (8) is a plurality of and arranges along the axially spaced-apart of described section rod tube (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220730844 CN202970517U (en) | 2012-12-26 | 2012-12-26 | Drill pipe of rotary drilling rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220730844 CN202970517U (en) | 2012-12-26 | 2012-12-26 | Drill pipe of rotary drilling rig |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202970517U true CN202970517U (en) | 2013-06-05 |
Family
ID=48511605
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220730844 Expired - Lifetime CN202970517U (en) | 2012-12-26 | 2012-12-26 | Drill pipe of rotary drilling rig |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202970517U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329035A (en) * | 2014-08-29 | 2015-02-04 | 南宁市宏涛机械设备有限责任公司 | Multistage connection and expansion automatic lock rod pressure device for rotary drilling machine drill rods |
| CN108994536A (en) * | 2018-07-26 | 2018-12-14 | 天津鸿翔工程机械有限公司 | A kind of processing method of machine locking-type drilling rod |
| CN112943116A (en) * | 2021-03-30 | 2021-06-11 | 海安土力机械制造有限公司 | Drill rod perforated pipe with perforated pipe wear-resistant sleeve |
-
2012
- 2012-12-26 CN CN 201220730844 patent/CN202970517U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104329035A (en) * | 2014-08-29 | 2015-02-04 | 南宁市宏涛机械设备有限责任公司 | Multistage connection and expansion automatic lock rod pressure device for rotary drilling machine drill rods |
| CN108994536A (en) * | 2018-07-26 | 2018-12-14 | 天津鸿翔工程机械有限公司 | A kind of processing method of machine locking-type drilling rod |
| CN108994536B (en) * | 2018-07-26 | 2019-09-20 | 天津鸿翔工程机械有限公司 | A kind of processing method of machine locking-type drilling rod |
| CN112943116A (en) * | 2021-03-30 | 2021-06-11 | 海安土力机械制造有限公司 | Drill rod perforated pipe with perforated pipe wear-resistant sleeve |
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Granted publication date: 20130605 |