CN204851058U - Soon towards stand wear and tear high life down --hole churn drilling tools - Google Patents
Soon towards stand wear and tear high life down --hole churn drilling tools Download PDFInfo
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- CN204851058U CN204851058U CN201520545374.1U CN201520545374U CN204851058U CN 204851058 U CN204851058 U CN 204851058U CN 201520545374 U CN201520545374 U CN 201520545374U CN 204851058 U CN204851058 U CN 204851058U
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Abstract
The utility model discloses a soon towards stand wear and tear high life down - -hole churn drilling tools is equipped with the check valve spring between check valve and the distribution seat, the drill bit has been cup jointed in the front connector, the bush cup joints with the drill bit afterbody, be equipped with the snap ring between front connector and the bush, the piston is hollow cylinder, is equipped with the piston main aspects on it, the one end of piston main aspects is equipped with the piston path, and the other end is equipped with piston tail footpath, the piston is served greatly, and one section is smooth cylinder, and another section evenly was equipped with the gas tank, be equipped with the gas polyhedron between piston path and the piston main aspects, it is equipped with annular air channel to cross between gas polyhedron and the piston main aspects, the piston tail directly is connected with cylindrical end, the cylindrical end end is equipped with the piston tail end, it cut the gas tank evenly to be equipped with the string on the piston tail end, one end evenly is equipped with anterior air passing hole on the inner casing, and the other end evenly is equipped with the oblique air passing hole of afterbody, be equipped with at a distance from the gas boss on the inner casing inner chamber. Its drilling speed is fast, is difficult for the jamming, and the fault rate is low, and the energy consumption is low, has improved work efficiency greatly, has practiced thrift the energy and cost.
Description
Technical field
The invention belongs to impactor manufacturing technology field, be specially one and rush wear-resistant high life down-the-hole churn drilling tools soon.
Background technology
Pneumatic hole impinger, also known as pneumatic down-hole hammer, is that one utilizes compressed air for power, promotes block stamp (piston) and clashes into the engineering pneumatic machinery drilling tool that drill bit implements rubble pore-forming; Impactor and drill bit, in rock drilling process, are connected by drilling rod and slip into fractured rock in hole simultaneously, and operating efficiency is not by the impact of hole depth; Therefore down-the-hole air hammer gains the name.Drilling Technology of Airdriven DTH Hammer is widely used in shot hole construction, hydrological well Drilling, and geological core is explored, Base of Dam of Reservoir curtain grouting, engineering geologic investigation, no-dig technique pipe installation, nearly all drilling construction field such as building foundation and geotechnical engineering.
The existing pneumatic hole impinger of China because of blast restriction (below 1.9Mpa) that provided by air compressor machine in the past still the China of continuing to use over from the down-the-hole drill of the blast on the low side of introduction abroad and drilling tool as Fig. 1, in addition valve free impacter major part (as piston, inner casing) processing technology is complicated at that time, and material and Technology for Heating Processing are with abroad also there is a big difference; In order to obtain suitable ballistic work, the impactor designed at that time is all the impactor of Long travel, lower frequency of impact (less than 20 times/second), and the use of material is also less demanding; Along with the high speed development of China's modern industry, the generation of high blast (more than 3.4Mpa) high-performance air compressor, the use of the existing impactor of China usually occurs that block stamp ruptures, penetration rate is unhappy and impactor in use occurs the problems such as catching phenomenon, can not meet the demand that modern industry is produced.
By patent retrieval, there is following known prior art:
Patent 1:
Application number: 201310077611.1, the applying date: 2013-03-12, the open day for announcing: 2013-06-26, low air-pressure down-the-hole hammer in one, it comprises rear joint, non retern valve, distribution bar, piston, inner casing, outer tube, collar, fairlead, blocking, first spring, rubber bar, lateral pin, hanging lock type drill bit and hanging lock type front connector, described non retern valve is one way valve, it has valve seat and the second spring, described piston is the elongated shape piston having duct, described distribution bar and the air inlet seat of non retern valve rear end are structure as a whole, inner casing is positioned at distribution bar, the outside of piston, in piston movement process, piston and distribution bar abutting end are in interior cylinder interior all the time, cavity is formed between the part of piston and outer tube, piston remainder coordinates with inner casing.Distribution bar of the present invention and check valve seat are integrated, and structure is simple, the function that can realize location, vibration damping, air inlet, reliable and stable during work; Piston and inner casing contact site reduce, and inner casing is more wear-resisting, and impactor working pressure range is wide.
Patent 2:
Application number: 201210125794.5, the applying date: 2012-04-26, the open day for announcing: 2013-10-30, a kind of efficient down-hole hammer, it comprises rear joint, non retern valve, distribution bar, piston, cylinder body, snap ring, drill bit, front connector, and described non retern valve is one way valve, it comprises valve seat, spring, steel washer, described piston is the elongated shape piston having duct, is provided with positioning sleeve in valve end cap rear end, and distribution bar is installed on positioning sleeve inside together with a positive and a negative vibration-proof rubber circle.Impactor of the present invention has great innovation without interior cylinder structure and distribution mode, the reaction force that antivibration micromatic setting effectively can absorb piston movement is provided with between rear joint and distribution bar, and the verticality that energy automatic fine tuning distribution bar keeps it to assemble, the drill bit of institute's adapted is anury cast, decrease the leakage of gases at high pressure, improve operating efficiency, reduce cost of production simultaneously.Piston has reliable application life.
Patent 3:
Application number: 201410480814.X, the applying date: 2014-09-19, the open day for announcing: 2015-01-07, a kind of Novel downhole air hammer, comprise impactor main body, joint after impactor back body is provided with, front portion is provided with front connector, hollow duct is offered in rear joint, drill bit is connected with front connector, bit central hole is offered in drill bit, bit central hole is communicated with the end face inclined hole of drill bit, exit, hollow hole road in impactor main body is provided with non retern valve, distribution bar in impactor main body and non retern valve valve seat are integral type structure, except compressed air is introduced except cylinder body, also same cylinder body, piston realizes the distribution action of piston movement together, piston is arranged in inner casing, moves in inner casing and outer tube, led by fairlead in piston front portion, piston nose matches with drill bit, and the centre porosity in piston communicates with bit central hole.Present invention employs the piston structure of innovation, distribution bar, inner casing, rear joint trim designs close, and the snap ring of innovation and front connector assembly structure, make whole impactor rational in infrastructure, operating efficiency is high, also reduces cost of production simultaneously.
Found by above retrieval, above technical scheme can not affect novelty of the present invention; And the mutual combination of above patent document can not destroy creativeness of the present invention.
Summary of the invention
The object of this invention is to provide one and rush wear-resistant high life down-the-hole churn drilling tools soon, its drilling speed is fast, and not easily clamping stagnation, failure rate is low, energy consumption is low, substantially increases operating efficiency, has saved the energy and cost.
For realizing above object, the technical solution used in the present invention is: one rushes wear-resistant high life down-the-hole churn drilling tools soon, and it comprises outer shell (6) and the front connector (10) be connected with its front and back end by screw thread and rear joint (1); Be provided with piston (7) in described outer shell (6) to be socketed with inner casing (5), lining (8); Described inner casing (6) other end is socketed with distribution seat (4); Non retern valve (2) is provided with between described distribution seat (4) and rear joint (1); Non retern valve spring (3) is provided with between described non retern valve (2) and distribution seat (4); Described front connector (10) is socketed with drill bit (11); Described lining (8) and drill bit (11) afterbody are socketed; Snap ring (9) is provided with between described front connector (10) and lining (8); Described piston (7) is hollow cylinder, is provided with the large end of piston (75); One end of the large end of described piston (75) is provided with piston path (72), and the other end is provided with piston tail part footpath (77); On the large end of described piston (74), one section is cylinder, and another section was evenly provided with air drain (76); Gas polyhedron (73) was provided with between described piston path (72) and the large end of piston (75); Described mistake between gas polyhedron (73) and the large end of piston (75) is provided with ring-shaped ventilation groove (74); Described piston tail part footpath (77) is connected with cylindrical end (78); Described cylindrical end (78) end is provided with piston tail end (79); Described piston tail end (79) is evenly provided with flat-cut and crosses air drain (70); The upper one end of described inner casing (5) is evenly provided with anterior air passing hole (51), and the other end is evenly provided with the oblique air passing hole of afterbody (54); Inner casing inner chamber (52) is provided with in described inner casing (6); Described inner casing inner chamber (52) is provided with trapping boss (53).
Further, described piston path (72) is provided with annular boss (14) near crossing gas polyhedron (73) place; Described annular boss (14) external diameter is identical with piston nose (71); Described annular boss (14) and the large end of piston (74), outer shell (7) and lining (8) form and cushion air cavity (15).
Further, described gas polyhedron (73) is excessively cylinder, and its external peripheral surface is evenly provided with flat-cut limit (731).
Further, described flat-cut limit (731) is five.
Further, described piston tail end (79) is cylinder, its external peripheral surface is evenly provided with one section of flat-cut and crosses air drain (70); Described piston tail end 79 coordinates with inner casing 5 and is socketed.
Further, described flat-cut is crossed air drain (70) and is evenly provided with five.
Further, described snap ring (9) is semicircular ring shape, two snap ring (9) compositions full circle ring; On its excircle, center is provided with annular groove; Rubber ring (92) is provided with in described annular groove; Described snap ring (9) inner periphery cross section is trapezium structure (91); Described snap ring (9) both ends of the surface and inner periphery junction are provided with circular arc and cross gas groove (93).
Further, described non retern valve spring (3) is drop centre type helical spring.
Beneficial effect of the present invention:
1, frequency of impact of the present invention is high, and punching rate wants fast more than 45% relative to product of the same type, air consumption is little, more economical, structure is simple, parts reliability is good, drill bit easy removal.
2, piston small end of the present invention adds annular boss, itself and the large end of piston, outer shell and lining form and cushion air cavity, can form closed airbag when carrying brill, can not damage by the parts such as available protecting lining, snap ring, reduce fault rate, improve application life.
3, piston in the present invention is canceled and traditional was grown tank structure, gas polyhedron was had additional between the large end of piston and piston path, piston base is provided with flat-cut and crosses air drain, make when piston air flue is more unimpeded does not exist gas circuit dead angle, heat treatment, not easily to produce stress to concentrate, reduce difficulty of processing, stability in use is stronger, makes impactor longer service life, runs more stable.
4, be provided with trapping boss in inner casing inner casing in the present invention, replace traditional annular chamber, the motion of piston in inner casing is more steady, and more effectively make use of the energy acting of calming the anger, the Energy harvesting of calming the anger is higher, and economy is better.
5, adopt two half-round clamping rings by O type snare dress in the present invention, make to propose the axially-movable of boring limit drill bit, prevent drill bit from dropping out, ensure the stability of its structure and installation, improve application life.
6, the scope of application of the present invention is broader, and can adapt to source of the gas air pressure is between 1Mpa-4Mpa.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is the structural representation of piston in the present invention.
Fig. 3 is the sectional view of guiding hypomere in B-B place in Fig. 2.
Fig. 4 is the sectional view of C-C place spline in Fig. 2.
Fig. 5 is the sectional view of guiding epimere in D-D place in Fig. 2.
Fig. 6 is the phantom drawing of inner casing in the present invention.
Fig. 7 is the structure chart of inner casing in the present invention
Fig. 8 is the complete section figure of snap ring in the present invention.
Fig. 9 is the structure chart of snap ring in the present invention.
Figure 10 is the structural representation of non retern valve spring in the present invention.
Shown in figure, numerical reference is expressed as: 1, rear joint, 2, non retern valve, 3, non retern valve spring, 4, distribution seat, 5, inner casing, 6, outer shell, 7, piston, 8, lining, 9, snap ring, 10, front connector, 11, drill bit, 14, annular boss, 15, buffering air cavity, 51, anterior air passing hole, 52, inner casing inner chamber, 53, trapping boss, 54, the oblique air passing hole of afterbody, 70, flat-cut crosses air drain, 71, piston nose, 72, piston path, 73, cross gas polyhedron, 74, ring-shaped ventilation groove, 75, the large end of piston, 76, cross air drain, 77, piston tail part footpath, 78, cylindrical end, 79, piston tail end, 91, trapezium structure, 92, rubber ring, 93, circular arc crosses gas groove, 731, flat-cut limit.
Detailed description of the invention
In order to make those skilled in the art understand technical scheme of the present invention better, describe the present invention below in conjunction with accompanying drawing, the description of this part is only exemplary and explanatory, should not have any restriction to protection scope of the present invention.
As Figure 1-10 shows, overall structure annexation of the present invention is: one rushes wear-resistant high life down-the-hole churn drilling tools soon, and it comprises outer shell 6 and the front connector 10 that is connected with its front and back end by screw thread and rear joint 1; Be provided with piston 7 in described outer shell 6 to be socketed with inner casing 5, lining 8; Described inner casing 6 other end is socketed with distribution seat 4; Non retern valve 2 is provided with between described distribution seat 4 and rear joint 1; Non retern valve spring 3 is provided with between described non retern valve 2 and distribution seat 4; Described front connector 10 is socketed with drill bit 11; Described lining 8 is socketed with drill bit 11 afterbody; Snap ring 9 is provided with between described front connector 10 and lining 8; Described piston 7 is hollow cylinder, is provided with the large end 75 of piston; One end of the large end 75 of described piston is provided with piston path 72, and the other end is provided with piston tail part footpath 77; On the large end 74 of described piston, one section is cylinder, and another section was evenly provided with air drain 76; Gas polyhedron 73 was provided with between described piston path 72 and the large end 75 of piston; Described mistake between gas polyhedron 73 and the large end 75 of piston is provided with ring-shaped ventilation groove 74; Described piston tail part footpath 77 is connected with cylindrical end 78; Described cylindrical end 78 end is provided with piston tail end 79; Described piston tail end 79 is evenly provided with flat-cut and crosses air drain 70; On described inner casing 5, one end is evenly provided with anterior air passing hole 51, and the other end is evenly provided with the oblique air passing hole 54 of afterbody; Inner casing inner chamber 52 is provided with in described inner casing 6; Described inner casing inner chamber 52 is provided with trapping boss 53.
Preferably, described piston path 72 is provided with annular boss 14 near crossing gas polyhedron 73 place; Described annular boss 14 external diameter is identical with piston nose 71; Described annular boss 14 and the large end 74 of piston, outer shell 7 and lining 8 form and cushion air cavity 15.
Preferably, described gas polyhedron 73 is excessively cylinder, and its external peripheral surface is evenly provided with flat-cut limit 731.
Preferably, described flat-cut limit 731 is five.
Preferably, described piston tail end 79 is cylinder, its external peripheral surface is evenly provided with one section of flat-cut and crosses air drain 70; Described piston tail end 79 coordinates with inner casing 5 and is socketed.
Preferably, described flat-cut is crossed air drain 70 and is evenly provided with five.
Preferably, described snap ring 9 is semicircular ring shape, and two snap rings 9 form a full circle ring; On its excircle, center is provided with annular groove; Rubber ring 92 is provided with in described annular groove; Described snap ring 9 inner periphery cross section is trapezium structure 91; Described snap ring 9 both ends of the surface and inner periphery junction are provided with circular arc and cross gas groove 93.
Preferably, described non retern valve spring 3 is drop centre type helical spring.
Operating principle:
Work of the present invention runs and is divided into two stages: one is the backward stroke of the piston stage, and two is piston stroke stages; Ante-chamber is inflated, and pressure raises, and back cavity loses heart, and pressure reduces, and piston is the backhaul stage to left movement: otherwise, be the stroke stage.
Compressed air backs down non retern valve 2 by rear joint 1 centre bore, then enters the gap between outer shell 6 and inner casing 5 by the axial hole of distribution seat 3, the air inlet of inner casing 5.In order to ventilate, inside outer shell 6, be designed with the cannelure of ventilation; Inner casing 5 inside and outside circle car has ventilation groove, and piston 7 cylindrical is milled with ventilation arc groove; Compressed air by these arc grooves enter jointly formed by piston 7, lining 8, drill bit 11, outer shell 6 before air chamber.Front air chamber compressed air promotes piston 7 and travels forward; When piston 7 moves to impact end and lining 8 departs from, compressed air is arrived at the bottom of hole by drill bit 11 centre bore, completes the effect of blowing slag.Because piston 7 drawback movement closes backhaul inlet channel, simultaneously, the pressure of air chamber compressed air declines rapidly, and piston 7 only has by inertia continuation drawback movement; And meanwhile, distribution seat 4 elongate rod has sealed piston 7 centre bore, the rear gas chamber be made up of inner casing 5, annular space between distribution seat 4 and piston 7 also starts air inlet, and piston 7 arrives lower dead center under the compressed-air actuated effect of back cavity, and piston 7 just stops return moving; At the end of backhaul, because distribution seat elongate rod has sealed piston 7 centre bore, and lining 8 and piston 7 impact end are thrown off. namely, cavity pressure raises, ante-chamber pressure reduces, compressed air promotes piston 7 and moves right, piston 7 enters the stroke stage, and piston 7 carries out stroke movement under stroke pressure effect to be hit drill bit 11 and does work, and completes brokenly rock work.When stroke movement is to during soon close to drill bit, backhaul inlet channel is opened, and starts the backhaul preparation of piston 7.And so forth, what complete impactor creeps into work.
Deslagging principle: when the rock slag at the bottom of hole accumulates more, rig starts to carry brill, cleaning eye bed rock slag.At this moment compressed air is by blowing
Cinder hole enters piston center hole, then at the bottom of centre bore access aperture.The circulating system moving conduit of impactor is closed simultaneously, stops impact work.All gases at high pressure, all for deslagging, are accomplished to make object clean at the bottom of hole.To recover impact work; as long as handle rig feed system; drill bit is moved downward; withstand rock; (rig starts to carry brill just to continue rock fracture in dynamic indentation; because 5 inches of hyperbars, high efficiency are rushed Novel downhole air hammer soon and be provided with buffer area between piston and lining during cleaning eye bed rock slag, when carrying brill, can closed airbag be formed, can the parts such as available protecting lining, snap ring do not damage).
The present invention utilizes piston movement to open and close different passage, thus controls compressed-air actuated switching, and the distribution process of piston in cylinder body has three states, i.e. suction stroke, expansion (compression) stroke, instroke, with have compared with valve-type down-the-hole air hammer, use the down-the-hole air hammer good economy performance of valveless, compressed air consumption nearly 35% can be saved, in raising down-hole hammer impact energy, adopt the method improving compressed air pressure, design work pressure is (1Mpa-4Mpa), pressure improves, decrease reactive loss, impact energy also increases along with the rising of gas pressure, for the down-hole hammer of same size diameter, the raising of air pressure increases the useful effect power acted on piston, the quality of corresponding raising piston simultaneously, achieve down-hole hammer high pressure (maximum pressure 4Mpa), high energy (Single-impact Energy improves 30%), the operating characteristic of high frequency (frequency of impact more than 35 times/second). hyperbar type down-the-hole air hammer has rock drilling drilling depth fast, rock penetration performance is high, the characteristic that energy consumption is low.
It should be noted that, in this article, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise which key element, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.
Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above example just understands method of the present invention and core concept thereof for helping.The above is only the preferred embodiment of the present invention, should be understood that, due to the finiteness of literal expression, and objectively there is unlimited concrete structure, for those skilled in the art, under the premise without departing from the principles of the invention, some improvement, retouching or change can also be made, also above-mentioned technical characteristic can be combined by rights; These improve retouching, change or combination, or the design of invention and technical scheme are directly applied to other occasion without improving, and all should be considered as protection scope of the present invention.
Claims (8)
1. rush a wear-resistant high life down-the-hole churn drilling tools soon, it comprises outer shell (6) and the front connector (10) be connected with its front and back end by screw thread and rear joint (1); Be provided with piston (7) in described outer shell (6) to be socketed with inner casing (5), lining (8); Described inner casing (6) other end is socketed with distribution seat (4); Non retern valve (2) is provided with between described distribution seat (4) and rear joint (1); Non retern valve spring (3) is provided with between described non retern valve (2) and distribution seat (4); Described front connector (10) is socketed with drill bit (11); Described lining (8) and drill bit (11) afterbody are socketed; It is characterized in that, between described front connector (10) and lining (8), be provided with snap ring (9); Described piston (7) is hollow cylinder, is provided with the large end of piston (75); One end of the large end of described piston (75) is provided with piston path (72), and the other end is provided with piston tail part footpath (77); On the large end of described piston (74), one section is cylinder, and another section was evenly provided with air drain (76); Gas polyhedron (73) was provided with between described piston path (72) and the large end of piston (75); Described mistake between gas polyhedron (73) and the large end of piston (75) is provided with ring-shaped ventilation groove (74); Described piston tail part footpath (77) is connected with cylindrical end (78); Described cylindrical end (78) end is provided with piston tail end (79); Described piston tail end (79) is evenly provided with flat-cut and crosses air drain (70); The upper one end of described inner casing (5) is evenly provided with anterior air passing hole (51), and the other end is evenly provided with the oblique air passing hole of afterbody (54); Inner casing inner chamber (52) is provided with in described inner casing (6); Described inner casing inner chamber (52) is provided with trapping boss (53).
2. one according to claim 1 rushes wear-resistant high life down-the-hole churn drilling tools soon, it is characterized in that, described piston path (72) is provided with annular boss (14) near crossing gas polyhedron (73) place; Described annular boss (14) external diameter is identical with piston nose (71); Described annular boss (14) and the large end of piston (74), outer shell (7) and lining (8) form and cushion air cavity (15).
3. one according to claim 1 rushes wear-resistant high life down-the-hole churn drilling tools soon, it is characterized in that, described gas polyhedron (73) is excessively cylinder, and its external peripheral surface is evenly provided with flat-cut limit (731).
4. one according to claim 3 rushes wear-resistant high life down-the-hole churn drilling tools soon, it is characterized in that, described flat-cut limit (731) is five.
5. one according to claim 1 rushes wear-resistant high life down-the-hole churn drilling tools soon, it is characterized in that, described piston tail end (79) is cylinder, its external peripheral surface is evenly provided with one section of flat-cut and crosses air drain (70); Described piston tail end (79) coordinates with inner casing (5) and is socketed.
6. one according to claim 5 rushes wear-resistant high life down-the-hole churn drilling tools soon, it is characterized in that, described flat-cut is crossed air drain (70) and is evenly provided with five.
7. one according to claim 1 rushes wear-resistant high life down-the-hole churn drilling tools soon, it is characterized in that, described snap ring (9) is semicircular ring shape, two snap ring (9) compositions full circle ring; On its excircle, center is provided with annular groove; Rubber ring (92) is provided with in described annular groove; Described snap ring (9) inner periphery cross section is trapezium structure (91); Described snap ring (9) both ends of the surface and inner periphery junction are provided with circular arc and cross gas groove (93).
8. one according to claim 1 rushes wear-resistant high life down-the-hole churn drilling tools soon, it is characterized in that, described non retern valve spring (3) is drop centre type helical spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520545374.1U CN204851058U (en) | 2015-07-25 | 2015-07-25 | Soon towards stand wear and tear high life down --hole churn drilling tools |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520545374.1U CN204851058U (en) | 2015-07-25 | 2015-07-25 | Soon towards stand wear and tear high life down --hole churn drilling tools |
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| CN204851058U true CN204851058U (en) | 2015-12-09 |
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|---|---|---|---|
| CN201520545374.1U Withdrawn - After Issue CN204851058U (en) | 2015-07-25 | 2015-07-25 | Soon towards stand wear and tear high life down --hole churn drilling tools |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156024A (en) * | 2015-07-25 | 2015-12-16 | 湖南新金刚工程机械有限公司 | Quick-percussion, wear-resistant and long-service-life down-the-hole percussive drill tool |
| CN109184551A (en) * | 2018-11-21 | 2019-01-11 | 长沙黑金刚实业有限公司 | impactor |
-
2015
- 2015-07-25 CN CN201520545374.1U patent/CN204851058U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156024A (en) * | 2015-07-25 | 2015-12-16 | 湖南新金刚工程机械有限公司 | Quick-percussion, wear-resistant and long-service-life down-the-hole percussive drill tool |
| CN109184551A (en) * | 2018-11-21 | 2019-01-11 | 长沙黑金刚实业有限公司 | impactor |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151209 Effective date of abandoning: 20170905 |