CN102877796A - Guide sleeve for drill rod of rotary drill rig - Google Patents
Guide sleeve for drill rod of rotary drill rig Download PDFInfo
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- CN102877796A CN102877796A CN2012104107333A CN201210410733A CN102877796A CN 102877796 A CN102877796 A CN 102877796A CN 2012104107333 A CN2012104107333 A CN 2012104107333A CN 201210410733 A CN201210410733 A CN 201210410733A CN 102877796 A CN102877796 A CN 102877796A
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- overcoat
- rolling bearing
- hole
- inner sleeve
- spacer
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Abstract
The invention relates to a guide sleeve for a drill rod of a rotary drill rig so as to solve the technical problem that an existing guide sleeve is short in service life and loud in working noise and can be only used for one time. The guide sleeve for the drill rod of the rotary drill rig comprises an outer sleeve, an inner hole of the outer sleeve is in the shape of a two-stage step, an inner sleeve is mounted inside the inner hole, and the inner hole is in clearance fit with a portion, small in diameter, of the inner hole of the outer sleeve. Rolling bearings, a compression nut and a third spacer sleeve are mounted between the inner sleeve and a portion, large in diameter, of the inner hole of the outer sleeve, wherein the rolling bearings cling to the step planes of the inner hole of the outer sleeve, the compression nut is in threaded connection with an open end of the portion, large in diameter, of the inner hole of the outer sleeve, and the third spacer sleeve abuts among the rolling bearings and the compression nut. The inner sleeve is in interference fit with inner rings of the rolling bearings, outer rings of the rolling bearings are in interference fit with the outer sleeve, and the inner sleeve is in clearance fit with the compression nut. A detachment mechanism convenient for detaching the compression nut is arranged on the outer end face of the compression nut.
Description
Technical field
The present invention relates to a kind of drill rod of blast-hole drill guide pin bushing.
Background technology
Shown in accompanying drawing 7 and accompanying drawing 8, the employed drilling rod guide pin bushing of rotary drill in the existing mine of China is the sleeve that outer circumference surface is stepped that hardening agent steel integral body manufactures, and the larger section of this sleeve diameter is radially centrosymmetric to have two shape of a hoof grooves.During rotary drill boring, this horseshoe type groove is fixed the drilling rod guide pin bushing on chain-wales, then starts rig drilling rod is rotated in the drilling rod guide pin bushing.Be matched in clearance between drilling rod and the drilling rod guide pin bushing, so can produce sliding friction between them.This sliding friction meeting produces very large noise, on surrounding enviroment and workman's the larger impact of occupational safety and health generation.And along with the increasing of rotary drill drilling hole amount, cause the wearing and tearing that drilling rod and drilling rod guide pin bushing produce by this sliding friction, can cause the gap of drilling rod and drilling rod guide pin bushing constantly to enlarge, so that the dust that deslagging causes escapes into outside the guide pin bushing from this gap.These dust parts of escaping are out fallen in other operating mechanism of rotary drill, bring very large difficulty for the maintenance of these operating mechanisms, and another part then floats in the air, produce bad impact for surrounding enviroment and workman's occupational safety and health.Those do not have to escape and out are trapped in dust in drilling rod and the drilling rod guide pin bushing gap, then can further strengthen the wearing and tearing between drilling rod and the drilling rod guide pin bushing, reduce the application life of drilling rod and drilling rod guide pin bushing.Such drill rod of blast-hole drill guide pin bushing may wear to a certain degree and will integral body scrap, and belongs to disposable component.
Summary of the invention
The purpose of this invention is to provide that a kind of life-span is long, operating noise is smaller and can repeatedly change reusable drill rod of blast-hole drill guide pin bushing.
The drill rod of blast-hole drill guide pin bushing that technical solution of the present invention relates to comprises overcoat, described overcoat endoporus be two sections stepped, the inside is equipped with inner sleeve, inner sleeve and overcoat diameter of bore smaller part matched in clearance; Between described inner sleeve and the larger section of overcoat diameter of bore the rolling bearing that is close to overcoat endoporus cascaded surface, the clamp nut that is threaded with larger openend of overcoat diameter of bore are installed, be against the 3rd spacer between rolling bearing and the clamp nut, inner sleeve outer circumference surface between rolling bearing and clamp nut is provided with bulge loop, and the axial length of described bulge loop is slightly less than the 3rd spacer length; The cascaded surface of overcoat endoporus is divided into two sections, near the convex annular table top of rolling bearing inner ring, and should be a little less than the contact anchor ring of housing washer; The inner ring of described rolling bearing and inner sleeve interference fit, the outer ring of described rolling bearing and overcoat interference fit, described overcoat and the 3rd spacer matched in clearance, described inner sleeve and clamp nut matched in clearance, the outer face of described clamp nut is provided with the disassembly mechanism of convenient mounting or dismounting clamp nut.
After adopting technical scheme of the present invention, matched in clearance between the endoporus of inner sleeve and the drill rod of blast-hole drill, between inner sleeve outer circumference surface and the rolling bearing inner ring, then all be interference fit between the outer ring of rolling bearing and the overcoat endoporus, therefore rotary drill is when perforation, drilling rod drives rolling bearing inner ring by inner sleeve and rotates under the effect of frictional force, so just change the friction between drilling rod and the guide pin bushing into rolling friction by original sliding friction, reduce frictional force, prolonged the application life of guide pin bushing and drilling rod.And rolling bearing generally has certain play, and all is injected with grease, and these can slow down the impact between drilling rod and the guide pin bushing, so that the noise that rotary drill produces when work is also smaller.Owing on the clamp nut mounting mechanism being installed, clamp nut can be installed and removed, when being installed in like this any one damage of components between the jacket and inner sleeve, they can be installed and removed, timely quick-replaceable is to prolong the whole service life of guide pin bushing.
The further technical scheme of the present invention is: the cascaded surface of described overcoat endoporus has through hole, and the plug of this through hole of sealing is installed in the described through hole.
During rotary drill boring, guide pin bushing is axially perpendicular to ground, and that end of overcoat diameter of bore smaller part is towards landing, extraneous dust and water capacity The book of Changes are crossed the gap between clamp nut and the inner sleeve like this, enter the rolling bearing between larger of overcoat diameter of bore and the inner sleeve, increase the internal friction of rolling bearing.Install this through hole and with the sealing this through hole plug after, dust can not enter rolling bearing through this through hole at ordinary times, when needed, remove the sealing plug and can in time the emissions such as muddy water that enter between the larger section of overcoat and diameter of bore be gone out, prolong the life-span of rolling bearing.
Because rolling bearing and inner sleeve and overcoat all are interference fit, after rolling bearing damages, the demounting tools such as iron can be stretched into and prop up rolling bearing in this through hole, then beaing iron with hammer disassembles rolling bearing, perhaps enter this through hole with bare headed screw threads and back down rolling bearing, then with special tools such as drawing horse the rolling bearing dismounting is come, make things convenient for the dismounting of rolling bearing.
The further technical scheme of the present invention is: the through hole that is positioned at overcoat endoporus cascaded surface faces the outer ring of rolling bearing.
When rolling bearing damages very seriously, after retainer destruction, the inner ring of rolling bearing can separate with the outer ring, because inner ring and inner sleeve interference fit, outer ring and the overcoat interference fit of rolling bearing, if be positioned at the through hole of overcoat endoporus cascaded surface facing to the inner ring of rolling bearing retainer or rolling bearing, then iron can not arrive to the outer ring of rolling bearing, also just can not apply end thrust to housing washer, thereby the outer ring of rolling bearing can not be disassembled, adopt this technical scheme then can pull down easily in this case the outer ring of rolling bearing.The inner ring of rolling bearing since with the inner sleeve interference fit, can beat inner sleeve behind the clamp nut in dismounting and disassemble along the inner ring of band with rolling bearing.
The further technical scheme of the present invention is: the through hole on the described overcoat endoporus cascaded surface is divided into screwed hole section and unthreaded hole section, is threaded with described plug, and the diameter of described through hole whorl hole section is greater than the diameter of unthreaded hole section.
Adopt this technical scheme, because the screwed hole section diameter of through hole is greater than unthreaded hole section diameter, when the dismounting rolling bearing, the instruments such as iron that put in through hole just are not easy to run into screw thread, have avoided the damage to screwed hole section in the through hole like this.
The further technical scheme of the present invention is, described rolling bearing is 1, is positioned at the annular groove that is provided with guide angle on the outer circumference surface of the overcoat inner peripheral surface at rolling bearing middle part and inner sleeve.
When drill pipe diameter was larger, because drilling rod runout less in this case can be selected 1 rolling bearing, the general axial dimension of certain this rolling bearing was larger, such as needle bearing.Can reduce number of parts like this, and the rolling bearing that equates with race diameter is compared, the needle bearing inner ring diameter is larger, and the inner sleeve diameter that cooperates with the needle bearing inner ring accordingly can be larger, also just in time can hold the larger drilling rod of diameter in the same situation of overcoat diameter.After being provided with the annular groove of guide angle on the overcoat inner peripheral surface at rolling bearing middle part and the outer circumference surface of inner sleeve, rolling bearing is easy to the annular groove through this guide angle when mounting or dismounting, made things convenient for the mounting or dismounting of rolling bearing.
The further technical scheme of the present invention is: described rolling bearing has individual more than 2, the first spacer and the second spacer that prop up respectively their outer rings and inner ring are installed between the described rolling bearing, be positioned at the annular groove that is provided with guide angle on the overcoat inner peripheral surface at the first spacer and the second spacer middle part and the outer circumference surface of inner sleeve, described the first spacer and overcoat, described the second spacer and inner sleeve are matched in clearance.
When drill pipe diameter was smaller, because the drilling rod runout is relatively large, corresponding guide pin bushing length was also larger, and a rolling bearing is inadequate, generally will select 2 bearings or 3 bearings, and the axial length of the rolling bearing of selecting in this case can be less than normal.Then lay spacer between the rolling bearing, cause roller bearing shop inner ring or outer ring axial location difficulty to avoid rolling bearing directly to connect, and the direct bump that produces.Be provided with the annular groove of guide angle on the overcoat inner peripheral surface at the first spacer and the second spacer middle part and the outer circumference surface of inner sleeve, then more can make things convenient for the mounting or dismounting of the less rolling bearing of selected in this case axial length.The first spacer and overcoat, described the second spacer and inner sleeve are matched in clearance, also more can make things convenient for their mounting or dismounting.
The further technical scheme of the present invention is: the disassembly mechanism that the outer face of described clamp nut is provided with convenient mounting or dismounting clamp nut is blind hole or the boss that is arranged near circumference place, middle part, outer face.
Adopt this technical scheme, in mounting or dismounting during clamp nut, iron can be stretched into blind hole or be against on the boss, mounting or dismounting tools has just had the point of application like this, the convenient guide pin bushing of installing and removing; And blind hole and boss structure are simple, easily processing.
The further technical scheme of the present invention is: clamp nut, overcoat diameter of bore smaller part are respectively and be provided with seal between the inner sleeve.
Preferably, described seal can be O-ring seals, and the cross section of perhaps being made by wool felt etc. is the sealing ring of rectangle.
Seal is installed is prevented effectively that extraneous dust and water from entering rolling bearing through the gap between clamp nut, the jacket and inner sleeve, reduce the internal friction of rolling bearing, prolong the life-span of rolling bearing.O-ring seals, the cross section of perhaps being made by wool felt etc. are that the sealing ring of rectangle belongs to working standard spare, easily obtain, and effect are also pretty good.
Description of drawings
The lateral view of Fig. 1 guide pin bushing of the present invention
Fig. 2 partly cuts open figure along what Fig. 1 shape of a hoof groove center line was only installed 2 rolling bearing guide pin bushings
Fig. 3 inner sleeve shown in Figure 2 is near the openend enlarged drawing of clamp nut
Fig. 4 overcoat shown in Figure 2 is near the enlarged drawing at the 3rd spacer place
The enlarged drawing of Fig. 5 through hole shown in Figure 2
Fig. 6 partly cuts open figure along what shape of a hoof groove center line was only installed 1 rolling bearing guide pin bushing
The guide pin bushing lateral view of Fig. 7 prior art
The guide pin bushing that Fig. 8 does along Fig. 7 shape of a hoof groove center line partly cuts open figure
The specific embodiment
As described in Figure 1, guide pin bushing of the present invention comprises the overcoat 1 of tubular, and the outer circumference surface of described overcoat 1 is stepped, radially has two on the end face of the larger end of diameter and is used for the fixedly shape of a hoof groove of guide pin bushing.
As shown in Figure 2, the endoporus of described overcoat 1 be two sections stepped, the inside is provided with an inner sleeve 2 that runs through whole overcoat 1 endoporus.The outside diameter of described inner sleeve 2 is slightly less than the diameter of overcoat 1 diameter of bore smaller part, with overcoat 1 diameter of bore smaller part matched in clearance, thereby forms the blind hole of a ring-type between larger of overcoat 1 diameter of bore and inner sleeve 2.This blind hole the inside is provided with the first rolling bearing 31, the second rolling bearing 32 and clamp nut 4 successively, and as shown in Figure 3, inner sleeve 2 cylindrical two ends are equipped with the little guide angle taper seat 22 of being convenient to pack into.
The end face of described the first rolling bearing 31 is close to the cascaded surface of overcoat 1 endoporus, is provided with the cycle surface that props up respectively the first rolling bearing 31 and the second rolling bearing 32 and the first spacer 51 and second spacer 52 of inner ring end face between the first rolling bearing 31 and the second rolling bearing 32.Between described the second rolling bearing 32 and the clamp nut 4 the 3rd spacer 53 is installed, described the 3rd spacer 53 1 ends prop up clamp nut 4 inner faces, and the other end props up the cycle surface of the second rolling bearing 32.The outer circumference surface of described clamp nut 4 has screw thread, the openend of the larger section of overcoat 1 diameter of bore is provided with internal thread, be threaded between clamp nut 4 and the overcoat 1, as shown in Figure 4, be provided with the little guide angle taper seat 11 of being convenient to pack into the 3rd spacer 53 cooperation places near the openend internal thread of the larger section of overcoat 1 diameter.Rotatably compress nut 4 and just can compress the 3rd spacer 53, the second rolling bearing 32, the first spacer 51 and the second spacer 52 and the first rolling bearing 31 that is installed in overcoat 1 endoporus.Inner sleeve 2 outer circumference surfaces between rolling bearing 32 and clamp nut 4 are provided with bulge loop 21, and an end face of bulge loop 21 is near the inner face of clamp nut 4, and the other end of bulge loop 21 is near the inner ring end face of the second rolling bearing 32.The axial length of bulge loop 21 is slightly less than the 3rd spacer 53 length, and bulge loop 21 both can guarantee rotating freely of rolling bearing 32, can limit again the axially-movable of the second rolling bearing 32 inner rings, can also stop inner sleeve 2 to come off under the effect of drilling rod axial force; Be convenient mounting or dismounting, the endoporus matched in clearance of the first spacer 51 and the 3rd spacer 53 and overcoat 1, the second spacer 52 endoporus and inner sleeve 2 also are matched in clearance.
The annular recess 6 that guide angle is housed also is set on the inner peripheral surface of the overcoat 1 between the first rolling bearing 31 and the second rolling bearing 32 and the outer circumference surface of inner sleeve 2, when mounting or dismounting the first rolling bearing 31 and the first spacer 51 and the second spacer 52, they are easy to by this position like this.
The cascaded surface of overcoat 1 endoporus is provided with uniform several through holes 7, be provided with the plug 8 of this through hole of sealing in the through hole 7, this plug 8 can be the part of rubber stopper and so on, but is preferably screw, has the screw thread with this screw fit this moment bottom the close overcoat 1 interior hole end surface.Turn on screw just can with enter between overcoat 1 and the inner sleeve 2 the emissions such as muddy water out, tighten this screw and can prevent that then dust from entering the first rolling bearing 31 and the second rolling bearing 32 by through hole 7.When the dismounting guide pin bushing, the demounting tools such as iron can be stretched into and prop up the first rolling bearing 31 in this through hole 7 simultaneously, then use hammer tapped iron, the component between overcoat 1 and the inner sleeve 2 are taken apart.Through hole 7 general outer ring or retainers facing to the first rolling bearing 31, shown in Figure 2 is a kind of preferred version, it is the outer ring that through hole 7 faces the first rolling bearing 31, the relatively severity of damaging at the first rolling bearing 31 like this, when namely fall apart in the inner ring of the first rolling bearing 31 and outer ring, also can pull down easily the outer ring of the first rolling bearing 31.For guaranteeing that rolling bearing 31 inner rings rotate freely, the cascaded surface of overcoat 1 endoporus is divided into two sections, near the convex annular table top of rolling bearing 31 inner rings, and should be a little less than the contact anchor ring of rolling bearing 31 outer rings.
Be provided with in the circumferential direction of the circle uniform several blind hole 9 or boss near circumference place, middle part, clamp nut 4 outer faces on the clamp nut 4, like this when mounting or dismounting clamp nut 4, iron can be propped up blind hole 9 or boss, then impact gently iron with instruments such as hammers, clamp nut 4 is installed and removed.
Described inner sleeve 2 outer circumference surfaces are provided with seal respectively and between the inner peripheral surface of clamp nut 4 inner peripheral surfaces, overcoat 1 diameter of bore minimum section.Described seal can be O-ring seals 10, and the cross section of perhaps being made by wool felt etc. is the rectangular ring sealing ring.
As shown in Figure 5, the through hole 7 on the overcoat 1 endoporus cascaded surface is divided into screwed hole section 71 and unthreaded hole section 72, is threaded with described plug 8, and the diameter of described through hole whorl hole section 71 is greater than the diameter of unthreaded hole section 72.
As shown in Figure 6, also can only establish a rolling bearing 3 in the blind hole of the ring-type that forms between by larger of overcoat 1 diameter of bore and inner sleeve 2, certainly such rolling bearing 3 axial lengths are larger, be positioned at the groove 6 that is provided with on the outer circumference surface of the inner peripheral surface of overcoat 1 at these rolling bearing 3 middle parts and inner sleeve 2 with the ring-type of guide angle, to make things convenient for the mounting or dismounting of rolling bearing 3.The structure that is provided with all the other aspects of rotary drill guide pin bushing of 1 rolling bearing can be the same with the rotary drill guide pin bushing that 2 above rolling bearings are set.
Claims (9)
1. a drill rod of blast-hole drill guide pin bushing comprises overcoat (1), it is characterized in that: described overcoat (1) endoporus be two sections stepped, the inside is equipped with inner sleeve (2), inner sleeve (2) and overcoat (1) diameter of bore smaller part matched in clearance;
Between described inner sleeve (2) and the larger section of overcoat (1) diameter of bore the rolling bearing (3 that is close to overcoat (1) endoporus cascaded surface is installed; 31), with the clamp nut (4) that larger openend of overcoat diameter of bore is threaded, be against rolling bearing (3; 32) and the 3rd spacer (5 between the clamp nut (4); 53), be positioned at rolling bearing (3; 32) and inner sleeve (2) outer circumference surface between the clamp nut (4) be provided with bulge loop (21), the axial length of described bulge loop 21 is slightly less than the 3rd spacer (5; 53) length;
Overcoat (1) endoporus cascaded surface is divided into two sections, near rolling bearing (3; 31) the convex annular table top of inner ring should be a little less than rolling bearing (3; 31) the contact anchor ring of outer ring;
Described rolling bearing (3; 31,32) inner ring and inner sleeve (2) interference fit, described rolling bearing (3; 31,32) outer ring and overcoat (1) interference fit, described the 3rd spacer (5; 53) with overcoat (1) matched in clearance, described inner sleeve (2) and clamp nut (4) matched in clearance;
The outer face of described clamp nut (4) is provided with the disassembly mechanism of clamp nut for convenience detach (4).
2. drill rod of blast-hole drill guide pin bushing according to claim 1, the cascaded surface of described overcoat (1) endoporus has through hole (7), and the plug (8) of this through hole of sealing (7) is installed in the described through hole (7).
3. drill rod of blast-hole drill guide pin bushing according to claim 2, the described through hole (7) that is positioned at overcoat (1) endoporus cascaded surface faces rolling bearing (3; 31) outer ring.
4. according to claim 2 or 3 described drill rod of blast-hole drill guide pin bushings, through hole (7) on described overcoat (1) the endoporus cascaded surface is divided into screwed hole section (71) and unthreaded hole section (72), be threaded with described plug (8), the diameter of described through hole whorl hole section (71) is greater than the diameter of unthreaded hole section (72).
5. drill rod of blast-hole drill guide pin bushing according to claim 1, described rolling bearing (3) is 1, is positioned at the annular groove (6) that is provided with guide angle on the outer circumference surface of overcoat (1) inner peripheral surface at rolling bearing (3) middle part and inner sleeve (2).
6. drill rod of blast-hole drill guide pin bushing according to claim 1, described rolling bearing (31,32) have more than 2, described rolling bearing (31, the first spacer (51) and the second spacer (52) that prop up respectively their outer rings and inner ring are installed 32), be positioned at the annular groove (6) that is provided with guide angle on overcoat (1) inner peripheral surface at the first spacer (51) and the second spacer (52) middle part and the outer circumference surface of inner sleeve (2), described the first spacer (51) is matched in clearance with overcoat (1), described the second spacer (52) with inner sleeve (2).
7. drill rod of blast-hole drill guide pin bushing according to claim 1, the described disassembly mechanism that is positioned at the clamp nut for convenience detach of clamp nut (4) outer face are blind hole (9) or the boss that is arranged near circumference place, middle part, outer face.
8. drill rod of blast-hole drill guide pin bushing according to claim 1, described clamp nut (4), overcoat (1) diameter of bore smaller part are provided with seal respectively and between the inner sleeve (2).
9. rotary drill guide pin bushing according to claim 8, it is characterized in that, describedly be arranged on clamp nut (4), overcoat (1) diameter of bore smaller part respectively and the seal between the inner sleeve (2) can be O-ring seals (10), the cross section of perhaps being made by wool felt etc. is the sealing ring of rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410733.3A CN102877796B (en) | 2012-10-24 | 2012-10-24 | Guide sleeve for drill rod of rotary drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410733.3A CN102877796B (en) | 2012-10-24 | 2012-10-24 | Guide sleeve for drill rod of rotary drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102877796A true CN102877796A (en) | 2013-01-16 |
| CN102877796B CN102877796B (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210410733.3A Active CN102877796B (en) | 2012-10-24 | 2012-10-24 | Guide sleeve for drill rod of rotary drill |
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| Country | Link |
|---|---|
| CN (1) | CN102877796B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4062412A (en) * | 1976-01-29 | 1977-12-13 | The United States Of America As Represented By The Secretary Of The Interior | Flexible shaft drilling system |
| JPH01223288A (en) * | 1987-12-23 | 1989-09-06 | Hilti Ag | Drill-chisel tool |
| CN2251037Y (en) * | 1996-01-05 | 1997-04-02 | 唐山钢铁集团有限责任公司 | Tri-cone rotary drilling rod |
| CN201021605Y (en) * | 2007-03-08 | 2008-02-13 | 滨州市天福石化机械有限责任公司 | Piston deviated friction preventive oil pumping pole |
| CN201588561U (en) * | 2009-11-26 | 2010-09-22 | 刘峻 | Well drilling rod with spiral guide sleeve |
| CN203114185U (en) * | 2012-10-24 | 2013-08-07 | 中钢集团衡阳重机有限公司 | Drill rod guide sleeve for rotary drill |
-
2012
- 2012-10-24 CN CN201210410733.3A patent/CN102877796B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4062412A (en) * | 1976-01-29 | 1977-12-13 | The United States Of America As Represented By The Secretary Of The Interior | Flexible shaft drilling system |
| JPH01223288A (en) * | 1987-12-23 | 1989-09-06 | Hilti Ag | Drill-chisel tool |
| CN2251037Y (en) * | 1996-01-05 | 1997-04-02 | 唐山钢铁集团有限责任公司 | Tri-cone rotary drilling rod |
| CN201021605Y (en) * | 2007-03-08 | 2008-02-13 | 滨州市天福石化机械有限责任公司 | Piston deviated friction preventive oil pumping pole |
| CN201588561U (en) * | 2009-11-26 | 2010-09-22 | 刘峻 | Well drilling rod with spiral guide sleeve |
| CN203114185U (en) * | 2012-10-24 | 2013-08-07 | 中钢集团衡阳重机有限公司 | Drill rod guide sleeve for rotary drill |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102877796B (en) | 2015-07-29 |
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Effective date of registration: 20180627 Address after: No. 1, Dongfeng Road, Zhu Hui District, Hengyang, Hunan Patentee after: China Steel Group Hengyang Machinery Co., Ltd. Address before: No. 1, Dongfeng Road, Zhu Hui District, Hengyang, Hunan Patentee before: Sinosteel Hengyang Machinery Co., Ltd. |