CN104265181A - Hydraulic impact-preventive screw drill - Google Patents
Hydraulic impact-preventive screw drill Download PDFInfo
- Publication number
- CN104265181A CN104265181A CN201410532604.0A CN201410532604A CN104265181A CN 104265181 A CN104265181 A CN 104265181A CN 201410532604 A CN201410532604 A CN 201410532604A CN 104265181 A CN104265181 A CN 104265181A
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- CN
- China
- Prior art keywords
- sleeve pipe
- sleeve
- transmission shaft
- screw drill
- drill
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a hydraulic impact-preventive screw drill. The hydraulic impact-preventive screw drill comprises a transmission shaft; a liquid hole is axially formed at the inner part of the transmission shaft; an upper limiting sleeve pipe is arranged in match with the outer side of the transmission shaft by a sleeving manner; a shaft end sleeve barrel which sleeves the outside of the transmission shaft through a spline is connected to the upper limiting sleeve pipe; a sealing sleeve pipe and an elastic buffering sleeve ring, which are tightly arranged at the outside of the transmission shaft by the sleeving manner, are arranged below the shaft end sleeve barrel; an elastic peripheral edge sleeve, which is mounted at the outside of the lower limiting sleeve pipe by the sleeving manner, is integrally connected with the peripheral side of the elastic buffering sleeve ring; a buffering sleeve pipe is connected in match with the lower end of the shaft end sleeve barrel; a hydraulic buffering cavity is axially formed in the upper part of the buffering sleeve pipe. According to the hydraulic impact-preventive screw drill, the liquid-based buffering and guide mode is adopted, which can effectively reduce or remove bit bouncing and impact vibration, the protection effect dynamically acts all the times, and therefore, the damage to a drill and a drill bit can be reduced, the connection of a drill collar and the completeness of the well wall are protected, and the service life of the whole drill is prolonged; in addition, the well drilling safety is improved.
Description
Technical field
The present invention relates to a kind of drilling equipment, particularly relate to a kind of helicoid hydraulic motor.
Background technology
Drilling and drill bit are depressed at wammel, creep into when exporting large torque by drilling tool, and particularly rock bit is crept into by the continuous rock crushing of cutter teeth, just create vibrations in carbon stone broken moment that is stressed and impact.What often show in layer of gravel or the large also bottom that tool is firmly poor of hardness is particularly outstanding, even occurs bouncing of drilling tool phenomenon.Can resonant interaction be produced if there is bouncing of drilling tool, the drill rod boring tool of thousands of meters can be made to beat together, very big to drilling rod, drilling tool, drill bit destructive power.Vibrations can cause larger destructive power to the borehole wall, and collapsing and breaking can occur, the accumulation falling block in a large number can produce the down-hole accidents such as bit freezing.
As shown in Figure 4, existing helicoid hydraulic motor holds and bears drilling pressure mainly through string bearing, string bearing is made up of interior steel ring 81, outer rim 82 and steel ball 83, and steel ball rolls in the track of interior steel ring 81 and outer rim 82 at work, steel ball 83 and interior steel ring 81, outer rim 82 linear contact lay.Steel ball 83 works under interacting at interior steel ring 81, outer rim about 82, subjects larger pressure and shearing force.The impact failure be subject in work, have impact on application life greatly.Universal joint is hit infringement equally comparatively greatly, impacts the damage easily causing petal and steel ball, decreases normal service life.Each junction button of drilling tool is also easily because impact endurance test shock occurs loosen and open button, and fall well accident.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of for alleviating in drilling process or eliminating bouncing of drilling tool and impact endurance test shock; reduce the damage of drilling tool, drill bit; the protection connection of drill collar and the intact of the borehole wall; improve the whole service life of drilling tool; increase drilling safety, improve the fluid power Anti-impact screw drill of bit speed.
For solving the problems of the technologies described above, technical scheme of the present invention is: fluid power Anti-impact screw drill, comprise power transmission shaft, the inside of described power transmission shaft axially offers liquid-through hole, described power transmission shaft mates outward and is arranged with upper limit sleeve pipe, described upper limit sleeve pipe is connected with the axle head sleeve be located at by spline housing outside described power transmission shaft, the below of described axle head sleeve is provided with and is closely set in Sealed casing pipe outside described power transmission shaft and elastic buffer lasso, the below of described elastic buffer lasso is provided with the lower limit sleeve pipe being fixedly set in described power transmission shaft lower port place, the outer circumferential side of described elastic buffer lasso is connected with the elasticity neighboring cover be sleeved on outside described lower limit sleeve pipe, the lower end coupling of described axle head sleeve is connected with and is closely set in described Sealed casing pipe, described elastic buffer lasso and elasticity neighboring cover outside buffer ferrule, the upper axial of described buffer ferrule offers hydraulically-damped chamber, the outer circumferential side of described elasticity neighboring cover and the inwall in described hydraulically-damped chamber closely cooperate, described hydraulically-damped chamber is connected with the liquid outlet being communicated to described buffer ferrule lower port.
As preferred technical scheme, described upper limit sleeve pipe is provided with upper limit convex shoulder, and the upper end of described axle head sleeve is sleeved on after outside described upper limit sleeve pipe and is resisted against on described upper limit convex shoulder.
As the improvement to technique scheme, described axle head sleeve comprises axle head sleeve and lower shaft end sleeve, the upper end of described lower shaft end sleeve is set in inside, described upper axle head sleeve lower end, the bottom of described lower shaft end sleeve is provided with lower sleeve convex shoulder, the threaded upper ends engagement sleeves of described buffer ferrule be located at described lower shaft end sleeve outer backward on be resisted against on described lower sleeve convex shoulder.
As the further improvement to technique scheme, the outer circumferential side cover of described Sealed casing pipe has some elastic seal rings.
As the further improvement to technique scheme, the top of described lower limit sleeve pipe is provided with lower limit convex shoulder, the upper end of described lower limit convex shoulder is connected with the bottom of described elastic buffer lasso, the bottom of described lower limit sleeve pipe and described elasticity neighboring overlap between interval arrange.
As improving especially further technique scheme, the internal diameter of the lower port of described elasticity neighboring cover from top to bottom increases gradually; The external diameter of the lower port of described lower limit sleeve pipe from top to bottom reduces gradually.
As improving especially further technique scheme, the lower surface of described elasticity neighboring cover is positioned at below the lower surface of described lower limit sleeve pipe.
As improving especially further technique scheme, be provided with lower buffering inner ring in described lower limit sleeve pipe, the internal diameter of described lower buffering inner ring is less than the diameter of described liquid-through hole, and the external diameter of described lower buffering inner ring is greater than the diameter of described liquid-through hole.
Owing to have employed technique scheme, fluid power Anti-impact screw drill, comprise power transmission shaft, the inside of described power transmission shaft axially offers liquid-through hole, described power transmission shaft mates outward and is arranged with upper limit sleeve pipe, described upper limit sleeve pipe is connected with the axle head sleeve be located at by spline housing outside described power transmission shaft, the below of described axle head sleeve is provided with and is closely set in Sealed casing pipe outside described power transmission shaft and elastic buffer lasso, the below of described elastic buffer lasso is provided with the lower limit sleeve pipe being fixedly set in described power transmission shaft lower port place, the outer circumferential side of described elastic buffer lasso is connected with the elasticity neighboring cover be sleeved on outside described lower limit sleeve pipe, the lower end coupling of described axle head sleeve is connected with and is closely set in described Sealed casing pipe, described elastic buffer lasso and elasticity neighboring cover outside buffer ferrule, the upper axial of described buffer ferrule offers hydraulically-damped chamber, the outer circumferential side of described elasticity neighboring cover and the inwall in described hydraulically-damped chamber closely cooperate, described hydraulically-damped chamber is connected with the liquid outlet being communicated to described buffer ferrule lower port.In drilling process, mud, the hydrodynamic media such as clear water flow through described liquid-through hole successively, described hydraulically-damped chamber and described liquid outlet, when there is bouncing of drilling tool or impact endurance test shock, the active force that liquid in described hydraulically-damped chamber is impacted, be delivered to described elasticity neighboring cover and described elastic buffer lasso successively, described elastic buffer lasso and described elasticity neighboring cover can adopt elastomeric material to make, the liquid of active force in described hydraulically-damped chamber impacted, described elasticity neighboring cover and described elastic buffer lasso, can be buffered step by step or eliminate.The form that the present invention adopts fluid cushion to conduct; effectively can alleviate or eliminate bouncing of drilling tool and impact endurance test shock; protective effect dynamically exists all the time; decrease the damage of drilling tool, drill bit; protect the connection of drill collar and the intact of the borehole wall; improve the whole service life of drilling tool, and add the safety of drilling well, improve the speed of drilling well.
Accompanying drawing explanation
The following drawings is only intended to schematically illustrate the present invention and explain, not delimit the scope of the invention.Wherein:
Fig. 1 is the structural representation of the embodiment of the present invention;
Fig. 2 is the A portion partial enlarged drawing of Fig. 1;
Fig. 3 is the B portion partial enlarged drawing of Fig. 1;
Fig. 4 is the structural representation of prior art.
In figure: 1-power transmission shaft; 11-liquid-through hole; 2-upper limit sleeve pipe; 21-upper limit convex shoulder; The upper axle head sleeve of 31-; 32-lower shaft end sleeve; 33-lower sleeve convex shoulder; 41-Sealed casing pipe; 42-elastic seal ring; 51-elastic buffer lasso; 52-elasticity neighboring is overlapped; 6-lower limit sleeve pipe; 61-lower limit convex shoulder; Inner ring is cushioned under 62-; 7-buffer ferrule; The hydraulically-damped chamber of 71-; 72-liquid outlet; Steel ring in 81-; 82-outer rim; 83-steel ball.
Detailed description of the invention
Below in conjunction with drawings and Examples, set forth the present invention further.In the following detailed description, the mode only by illustrating describes some one exemplary embodiment of the present invention.Undoubtedly, those of ordinary skill in the art can recognize, when without departing from the spirit and scope of the present invention, can revise by various different mode to described embodiment.Therefore, accompanying drawing is illustrative with being described in essence, instead of for limiting the protection domain of claim.
As Fig. 1, shown in Fig. 2 and Fig. 3, fluid power Anti-impact screw drill, comprise power transmission shaft 1, the inside of described power transmission shaft 1 axially offers liquid-through hole 11, the outer coupling of described power transmission shaft 1 is arranged with upper limit sleeve pipe 2, described upper limit sleeve pipe 2 is connected with the axle head sleeve be located at by spline housing outside described power transmission shaft 1, the below of described axle head sleeve is provided with and is closely set in Sealed casing pipe 41 outside described power transmission shaft 1 and elastic buffer lasso 51, the below of described elastic buffer lasso 51 is provided with the lower limit sleeve pipe 6 being fixedly set in described power transmission shaft 1 lower port place, the outer circumferential side of described elastic buffer lasso 51 is connected with the elasticity neighboring cover 52 be sleeved on outside described lower limit sleeve pipe 6, the lower end coupling of described axle head sleeve is connected with and is closely set in described Sealed casing pipe 41, the buffer ferrule 7 outside 52 is overlapped in described elastic buffer lasso 51 and elasticity neighboring, the upper axial of described buffer ferrule 7 offers hydraulically-damped chamber 71, the described elasticity neighboring cover outer circumferential side of 52 and the inwall in described hydraulically-damped chamber 71 closely cooperate, described hydraulically-damped chamber 71 is connected with the liquid outlet 72 being communicated to described buffer ferrule 7 lower port.In drilling process, mud, the hydrodynamic media such as clear water flow through described liquid-through hole 11 successively, described hydraulically-damped chamber 71 and described liquid outlet 72, when there is bouncing of drilling tool or impact endurance test shock, the active force that liquid in described hydraulically-damped chamber 71 is impacted, be delivered to described elasticity neighboring cover 52 and described elastic buffer lasso 51 successively, described elastic buffer lasso 51 and described elasticity neighboring cover 52 can adopt elastomeric material to make, the liquid of active force in described hydraulically-damped chamber 71 impacted, described elasticity neighboring cover 52 and described elastic buffer lasso 51, can be buffered step by step or eliminate.The present embodiment adopts the form of fluid cushion conduction; effectively can alleviate or eliminate bouncing of drilling tool and impact endurance test shock; protective effect dynamically exists all the time; decrease the damage of drilling tool, drill bit; protect the connection of drill collar and the intact of the borehole wall; improve the whole service life of drilling tool, and add the safety of drilling well, improve the speed of drilling well.
As shown in Figure 2, described upper limit sleeve pipe 2 is provided with upper limit convex shoulder 21, and the upper end of described axle head sleeve is sleeved on after outside described upper limit sleeve pipe 2 and is resisted against on described upper limit convex shoulder 21, and said structure is convenient to connect, and close structure is firm.
As shown in Figures 2 and 3, described axle head sleeve comprises axle head sleeve 31 and lower shaft end sleeve 32, the upper end of described lower shaft end sleeve 32 is set in inside, described upper axle head sleeve 31 lower end, the bottom of described lower shaft end sleeve 32 is provided with lower sleeve convex shoulder 33, the threaded upper ends engagement sleeves of described buffer ferrule 7 be located at described lower shaft end sleeve 32 outer backward on be resisted against on described lower sleeve convex shoulder 33, said structure is convenient to fractionation and is assembled, and close structure is firm.
As shown in Figure 3, the outer circumferential side cover of described Sealed casing pipe 41 has some elastic seal rings 42, and said structure can guarantee sealing effectiveness, prevents the hydrodynamic such as mud, clear water medium counter flow.
As shown in Figure 3, the top of described lower limit sleeve pipe 6 is provided with lower limit convex shoulder 61, the upper end of described lower limit convex shoulder 61 is connected with the bottom of described elastic buffer lasso 51, the bottom of described lower limit sleeve pipe 6 and described elasticity neighboring overlap 52 between interval arrange, when there is bouncing of drilling tool or impact endurance test shock, the active force that liquid in described hydraulically-damped chamber 71 is impacted, the bottom of described lower limit sleeve pipe 6 and described elasticity neighboring are overlapped the liquid of filling in interval between 52 and are easily impacted described elasticity neighboring and overlap 52 and outwards strut, making described elasticity neighboring overlap 52 coordinates tightr with the inwall in described hydraulically-damped chamber 71, existing good cushioning effect, sealing function can be played again, prevent liquid countercurrent.
The internal diameter of the lower port of described elasticity neighboring cover 52 from top to bottom increases gradually; The external diameter of the lower port of described lower limit sleeve pipe 6 from top to bottom reduces gradually, and said structure is convenient to the active force of shock absorbing, and existing good cushioning effect, can play sealing function again, prevent liquid countercurrent.
The lower surface of described elasticity neighboring cover 52 is positioned at below the lower surface of described lower limit sleeve pipe 6; when there is bouncing of drilling tool or impact endurance test shock; said structure can ensure that described elasticity neighboring cover 52 first receives the active force of impact; play cushion seal effect; described lower limit sleeve pipe 6 is protected to be impacted; decrease the damage of drilling tool, drill bit, protect the connection of drill collar and the intact of the borehole wall.
Lower buffering inner ring 62 is provided with in described lower limit sleeve pipe 6, the internal diameter of described lower buffering inner ring 62 is less than the diameter of described liquid-through hole 11, the external diameter of described lower buffering inner ring 62 is greater than the diameter of described liquid-through hole 11, when there is bouncing of drilling tool or impact endurance test shock, when said structure can arrive described power transmission shaft 1 lower port at the active force impacted, be subject to the buffering of described lower buffering inner ring 62, avoid described power transmission shaft 1 lower port to be impacted, decrease the damage of drilling tool, drill bit.
More than show and describe general principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; what describe in above-described embodiment and manual just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection domain is defined by appending claims and equivalent thereof.
Claims (8)
1. fluid power Anti-impact screw drill, comprise power transmission shaft, the inside of described power transmission shaft axially offers liquid-through hole, it is characterized in that: described power transmission shaft mates outward and is arranged with upper limit sleeve pipe, described upper limit sleeve pipe is connected with the axle head sleeve be located at by spline housing outside described power transmission shaft, the below of described axle head sleeve is provided with and is closely set in Sealed casing pipe outside described power transmission shaft and elastic buffer lasso, the below of described elastic buffer lasso is provided with the lower limit sleeve pipe being fixedly set in described power transmission shaft lower port place, the outer circumferential side of described elastic buffer lasso is connected with the elasticity neighboring cover be sleeved on outside described lower limit sleeve pipe, the lower end coupling of described axle head sleeve is connected with and is closely set in described Sealed casing pipe, described elastic buffer lasso and elasticity neighboring cover outside buffer ferrule, the upper axial of described buffer ferrule offers hydraulically-damped chamber, the outer circumferential side of described elasticity neighboring cover and the inwall in described hydraulically-damped chamber closely cooperate, described hydraulically-damped chamber is connected with the liquid outlet being communicated to described buffer ferrule lower port.
2. fluid power Anti-impact screw drill as claimed in claim 1, is characterized in that: described upper limit sleeve pipe is provided with upper limit convex shoulder, and the upper end of described axle head sleeve is sleeved on after outside described upper limit sleeve pipe and is resisted against on described upper limit convex shoulder.
3. fluid power Anti-impact screw drill as claimed in claim 1, it is characterized in that: described axle head sleeve comprises axle head sleeve and lower shaft end sleeve, the upper end of described lower shaft end sleeve is set in inside, described upper axle head sleeve lower end, the bottom of described lower shaft end sleeve is provided with lower sleeve convex shoulder, the threaded upper ends engagement sleeves of described buffer ferrule be located at described lower shaft end sleeve outer backward on be resisted against on described lower sleeve convex shoulder.
4. fluid power Anti-impact screw drill as claimed in claim 1, is characterized in that: the outer circumferential side cover of described Sealed casing pipe has some elastic seal rings.
5. fluid power Anti-impact screw drill as claimed in claim 1, it is characterized in that: the top of described lower limit sleeve pipe is provided with lower limit convex shoulder, the upper end of described lower limit convex shoulder is connected with the bottom of described elastic buffer lasso, the bottom of described lower limit sleeve pipe and described elasticity neighboring overlap between interval arrange.
6. fluid power Anti-impact screw drill as claimed in claim 1, is characterized in that: the internal diameter of the lower port of described elasticity neighboring cover from top to bottom increases gradually; The external diameter of the lower port of described lower limit sleeve pipe from top to bottom reduces gradually.
7. fluid power Anti-impact screw drill as claimed in claim 1, is characterized in that: the lower surface of described elasticity neighboring cover is positioned at below the lower surface of described lower limit sleeve pipe.
8. the fluid power Anti-impact screw drill as described in claim as arbitrary in claim 1 to 7, it is characterized in that: in described lower limit sleeve pipe, be provided with lower buffering inner ring, the internal diameter of described lower buffering inner ring is less than the diameter of described liquid-through hole, and the external diameter of described lower buffering inner ring is greater than the diameter of described liquid-through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410532604.0A CN104265181B (en) | 2014-10-11 | 2014-10-11 | Fluid power Anti-impact screw drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410532604.0A CN104265181B (en) | 2014-10-11 | 2014-10-11 | Fluid power Anti-impact screw drill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104265181A true CN104265181A (en) | 2015-01-07 |
| CN104265181B CN104265181B (en) | 2016-05-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410532604.0A Active CN104265181B (en) | 2014-10-11 | 2014-10-11 | Fluid power Anti-impact screw drill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104265181B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863849A (en) * | 2021-10-27 | 2021-12-31 | 盐城市荣嘉机械制造有限公司 | Vibration resisting type screw drill transmission shaft assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5083623A (en) * | 1990-12-03 | 1992-01-28 | Halliburton Company | Hydraulic shock absorber |
| CN2477809Y (en) * | 2001-03-30 | 2002-02-20 | 赵文泉 | Hydraulic shock reduction anti-dropping appts. |
| CN102061888A (en) * | 2011-01-04 | 2011-05-18 | 潍坊盛德石油机械制造有限公司 | Impact-resistant screw drill tool |
| CN203515311U (en) * | 2013-10-23 | 2014-04-02 | 盐城华亚石油机械制造有限公司 | Shock absorption and strike prevention screw drill |
| CN103953293A (en) * | 2014-04-11 | 2014-07-30 | 盐城市大冈石油工具厂有限责任公司 | Shock-absorption fluid director of screw drill |
| CN204152442U (en) * | 2014-10-11 | 2015-02-11 | 潍坊盛德石油机械制造有限公司 | Fluid power Anti-impact screw drill |
-
2014
- 2014-10-11 CN CN201410532604.0A patent/CN104265181B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5083623A (en) * | 1990-12-03 | 1992-01-28 | Halliburton Company | Hydraulic shock absorber |
| CN2477809Y (en) * | 2001-03-30 | 2002-02-20 | 赵文泉 | Hydraulic shock reduction anti-dropping appts. |
| CN102061888A (en) * | 2011-01-04 | 2011-05-18 | 潍坊盛德石油机械制造有限公司 | Impact-resistant screw drill tool |
| CN203515311U (en) * | 2013-10-23 | 2014-04-02 | 盐城华亚石油机械制造有限公司 | Shock absorption and strike prevention screw drill |
| CN103953293A (en) * | 2014-04-11 | 2014-07-30 | 盐城市大冈石油工具厂有限责任公司 | Shock-absorption fluid director of screw drill |
| CN204152442U (en) * | 2014-10-11 | 2015-02-11 | 潍坊盛德石油机械制造有限公司 | Fluid power Anti-impact screw drill |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113863849A (en) * | 2021-10-27 | 2021-12-31 | 盐城市荣嘉机械制造有限公司 | Vibration resisting type screw drill transmission shaft assembly |
| CN113863849B (en) * | 2021-10-27 | 2022-08-26 | 盐城市荣嘉机械制造有限公司 | Vibration resisting type screw drill transmission shaft assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104265181B (en) | 2016-05-04 |
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Denomination of invention: Hydraulic anti impact screw drill Effective date of registration: 20211222 Granted publication date: 20160504 Pledgee: Weifang rural commercial bank Limited by Share Ltd. hi tech sub branch Pledgor: WEIFANG SHENGDE PETROLEUM MACHINERY MANUFACTURING CO.,LTD. Registration number: Y2021980015963 |
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Granted publication date: 20160504 Pledgee: Weifang rural commercial bank Limited by Share Ltd. hi tech sub branch Pledgor: WEIFANG SHENGDE PETROLEUM MACHINERY MANUFACTURING CO.,LTD. Registration number: Y2021980015963 |