CN115162991B - Gas well oil pipe pressurized operation cutting tool and method - Google Patents
Gas well oil pipe pressurized operation cutting tool and method Download PDFInfo
- Publication number
- CN115162991B CN115162991B CN202110358927.2A CN202110358927A CN115162991B CN 115162991 B CN115162991 B CN 115162991B CN 202110358927 A CN202110358927 A CN 202110358927A CN 115162991 B CN115162991 B CN 115162991B
- Authority
- CN
- China
- Prior art keywords
- cutter
- sliding block
- cutter bar
- rotating shaft
- gas well
- 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.)
- Active
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims description 38
- 238000007789 sealing Methods 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 14
- 238000005553 drilling Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002343 natural gas well Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/08—Cutting or deforming pipes to control fluid flow
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Turning (AREA)
Abstract
The invention belongs to the technical field of pressurized operation, and particularly provides a gas well oil pipe pressurized operation cutting tool and a method.
Description
Technical Field
The invention belongs to the technical field of pressurized operation, and particularly relates to a gas well oil pipe pressurized operation cutting tool and a method.
Background
Practices of middle oil group companies in recent decades prove that the pressurized operation technology has irreplaceable technical advantages, and has become a main engineering technical means for improving and stabilizing single well yield. However, the production pipe column is in a complex environment in the well for a long time, the rust phenomenon of the connecting threads of the pipe column is common, and meanwhile, the natural gas well has an integrated process of adopting a plurality of drilling tools to perform partial pressing and solving on a plurality of reservoirs and then directly put into production, so that the later-stage normal shackle cannot be realized or the existing under-pressure operation equipment does not have the shackle function of the plurality of drilling tools, and the whole set of under-pressure pipe column operation cannot be realized.
When the pipe column is lifted by the pressure, the cutting tool is required to cut the pipe column, and the requirements are satisfied: the cutting rule is convenient for lifting the pipe column after the oil pipe blanking plug and the relevant oil pipe fishing tool are put in again, and certain pressure exists in the cutting operation space.
However, the main problems of the above technology are: the existing cutting tool cannot meet the cutting requirement when the pipe column is lifted up under pressure.
Disclosure of Invention
The invention provides a gas well oil pipe pressurized operation cutting tool and a method thereof, which aim to solve the problems that a well mouth airtight cutting pipe column of a complex pipe column (three or more than three packers) cannot operate, a plurality of drilling tool pipe columns cannot be lifted out, cutting operation is needed, and the existing cutting tool cannot meet the cutting requirement during the operation of pressurized pipe column lifting.
The invention provides a gas well oil pipe pressurized operation cutting tool which comprises a lower shell, a rotating shaft, a power mechanism, a feed mechanism and an upper shell, wherein the upper shell is connected with the lower shell, the rotating shaft is axially connected with the inner part of the lower shell, the power mechanism is connected with the feed mechanism, and the power mechanism and the feed mechanism are both connected with the outside of the rotating shaft.
The power mechanism comprises a sliding block lifting disc and a pushing component, the sliding block lifting disc is sleeved outside the rotating shaft, the pushing component is connected below the sliding block lifting disc, and the pushing component is connected with the outside of the rotating shaft.
The pushing component comprises a turbine and a worm, and the worm is respectively connected with the slider lifting disk and the rotating shaft through the turbine.
The cutter feeding mechanism comprises a sliding block, a cutter bar righting block, a cutter bar and a cutter, wherein the middle part of the sliding block is provided with a groove from top to bottom, the sliding block is connected with a sliding block lifting disc under the sliding block, the cutter bar righting block is connected with a rotating shaft, the cutter bar righting block is positioned in the groove, the cutter bar is respectively connected with the sliding block and the cutter bar righting block, the cutter is connected with the cutter bar, and the cutter is horizontally positioned inside the cutter bar righting block.
The cutter bar is connected with the sliding block and the cutter bar righting block through the pin shaft.
The number of the cutter feeding mechanisms is multiple, and the cutter feeding mechanisms of the cutter sleeves are circumferentially and equidistantly connected to the outside of the rotating shaft.
The sliding block is provided with a groove from left to right, and the cutter bar is movably connected with the groove.
The device also comprises a dustproof piece which is sleeved outside the upper part of the rotating shaft.
And a sealing member connected between the lower housing and the upper housing.
A gas well oil pipe under-pressure operation cutting method comprises the following steps:
during cutting, the worm drives the turbine to rotate positively, the sliding block lifting disc moves upwards, the sliding block extrudes the cutter bar and the cutter, and the cutter bar and the cutter move radially to finish one-time cutting;
when the tool is retracted, the worm drives the turbine to reversely rotate, the slider lifting disc moves downwards, and the slider drives the cutter bar and the tool to move to complete one-time tool retraction.
The invention has the beneficial effects that:
1. when the gas well oil pipe pressurized operation cutting tool and method provided by the invention are used, the upper end of the upper shell and the lower end of the lower shell are respectively connected with other pressurized operation tools to form a sealed space, so that the sealed pressurized cutting operation is realized;
2. according to the gas well oil pipe pressurized operation cutting tool and method provided by the invention, the power mechanism provides power for the feed mechanism to perform radial cutting, and the power mechanism adopts the turbine and the worm to push the slider lifting disk to move up and down, so that the slider fixedly connected with the slider lifting disk extrudes the feed mechanism to complete cutting and tool withdrawal, the operation is stable and controllable, the cutting is regular, and the pipe column is conveniently lifted up after the oil pipe plug is put into the oil pipe again.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a front view (not fed) of a gas well oil pipe pressurized working cutting tool;
FIG. 2 is a left side view of the construction of a gas well oil pipe pressurized working cutting tool;
fig. 3 is a front view of the structure of a gas well oil pipe pressurized working cutting tool (feed).
Reference numerals illustrate: 1. a lower housing; 2. a rotation shaft; 3. a bearing; 4. a turbine; 5. a worm; 6. a slider lifting disk; 7. a slide block; 8. a cutter bar righting block; 9. a cutter bar; 10. a bolt; 11. an upper housing; 12. a dust-proof member; 13. a seal; 14. a turbine connection; 15. turbine fasteners; 16. a pin shaft; 17. a knife; 18. a groove; 19. a groove.
Detailed Description
Example 1:
as shown in fig. 1-3, a gas well oil pipe pressurized operation cutting tool comprises a lower shell 1, a rotating shaft 2, a power mechanism, a feed mechanism and an upper shell 11, wherein the upper shell 11 is connected to the upper surface of the lower shell 1, the rotating shaft 2 is axially connected to the inner part of the lower shell 1, the power mechanism is connected with the feed mechanism, and the power mechanism and the feed mechanism are both connected to the outside of the rotating shaft 2.
When in use, the upper end of the upper shell 11 and the lower end of the lower shell 1 are respectively connected with other operation tools with pressure to form a sealed space, and the power mechanism pushes the feed mechanism to cut, so that the sealed operation with pressure is realized.
Further, the upper shell 11 and the lower shell 1 are connected through bolts, and the bolts are detachably connected, so that the installation and the disassembly are convenient.
Further, the power mechanism comprises a sliding block lifting disc 6 and a pushing component, the sliding block lifting disc 6 is sleeved outside the rotating shaft 2, the pushing component is connected below the sliding block lifting disc 6, and the pushing component is connected with the outside of the rotating shaft 2. The pushing component enables the slider lifting disk 6 to move up and down, when the slider lifting disk 6 moves upwards, the feeding mechanism is driven to cut, and when the slider lifting disk 6 moves downwards, the feeding mechanism is driven to finish retracting, and the structure is simple.
Further, the pushing component comprises a turbine 4 and a worm 5, and the worm 5 is respectively connected with the slider lifting disk 6 and the rotating shaft 2 through the turbine 4. The turbine 4 is a rotary power machine, the worm 5 can be driven by a hydraulic motor or a stepping motor to rotate in the forward direction or the reverse direction, and when the worm 5 rotates, the turbine is driven to rotate.
Further, the rotary shaft 2 is connected in the lower shell 1 through the bearing 3, so as to support the rotary shaft 2, reduce the friction coefficient in the motion process and ensure the rotation precision.
Further, the turbine 4 is connected to the rotating shaft 2 through the turbine connecting piece 14, so that the turbine 4 is convenient to connect and normal use of the turbine 4 is not affected.
Further, the turbine connecting piece 14 further comprises a turbine fastening piece 15, and the turbine connecting piece 14 is fastened through the turbine fastening piece 15, so that the stability of connection of the turbine 4 in use is ensured.
Further, the feed mechanism comprises a sliding block 7, a cutter bar righting block 8, a cutter bar 9 and a cutter 17, wherein a groove 18 is formed in the middle of the sliding block 7 from top to bottom, the sliding block lifting disc 6 is connected below the sliding block 7, the cutter bar righting block 8 is connected with the rotating shaft 2, the cutter bar righting block 8 is located in the groove 18, the cutter bar 9 is respectively connected with the sliding block 7 and the cutter bar righting block 8, the cutter 17 is connected with the cutter bar 9, and the cutter 17 is horizontally located inside the cutter bar righting block 8. The sliding block 7 is fixedly connected with the sliding block lifting disk 6, so that when the sliding block lifting disk 6 moves, the sliding block 7 moves stably, and then the cutter bar 9 is extruded stably; the cutter bar centering block 8 is fixedly connected to the rotating shaft 2, so that when the slider 7 moves to squeeze the cutter bar, the upper and lower positions of the cutter bar are unchanged, and the radial movement of the cutter bar and the cutter is ensured; simple structure and stable operation.
Further, the cutter bar 9 is connected with the sliding block 7 and the cutter bar centering block 8 through the pin 16. The pin shaft 16 is convenient to connect the cutter bar 9 on the cutter bar centralizing block 8 and the sliding block 7, and meanwhile, the cutter bar 9 is convenient to move, the structure is simple, and the installation and the disassembly are convenient.
Furthermore, the number of the cutter feeding mechanisms is multiple, and the cutter feeding mechanisms of the cutter sleeves are circumferentially and equidistantly connected to the outside of the rotating shaft 2. Ensuring that the cutting can still be performed again after 1 knife fails.
Further, a groove 19 is formed in the sliding block 7 from left to right, and the cutter bar 9 is movably connected with the groove 19. The groove 19 is convenient for driving the cutter bar 9 to move when the slide block 7 moves.
Further, as shown in fig. 1, the slot 19 is shaped like a fold line, and the fold line extends from top left to bottom right, so that when the slider 7 moves upward, the cutter bar is pressed radially inwards to facilitate cutting of the cutter, and when the slider 7 moves downward, the cutter bar is pulled radially outwards to facilitate withdrawal of the cutter.
Further, the device also comprises a dust-proof piece 12, and the dust-proof piece 12 is sleeved outside the upper part of the rotating shaft 2. In use, the dust guard 12 protects the internal construction of the device, increasing the service life.
Further, a sealing member 13 is further included, and the sealing member 13 is connected between the lower case 1 and the upper case 11. The seal 13 improves the tightness of the gas well oil pipe pressurized work tool.
Example 2:
a gas well oil pipe under-pressure operation cutting method comprises the following steps:
during cutting, the worm 5 drives the turbine 4 to rotate positively, the sliding block lifting disc 6 moves upwards, the sliding block 7 extrudes the cutter bar 9 and the cutter 17, and the cutter bar 9 and the cutter 17 move radially to finish one-time cutting;
when the tool is retracted, the worm 5 drives the turbine 4 to reversely rotate, the slider lifting disk 6 moves downwards, and the slider 7 drives the cutter bar 9 and the cutter 17 to move for one time to retract.
The invention has high pressure-resistant grade, regular notch and controllable cutter advancing and retracting, meets the use requirement of cutting an oil pipe column in gas well operation under pressure, and the integral pressure-bearing grade of the cutting tool under pressure reaches 35MPa, and the cutting operation is fractured: less than or equal to 15MPa; nominal diameter of cutting tool: 180mm; the oil pipe size is suitable for: 2 3 / 8 "、2 7 / 8 "、3 1 / 2 "; the average oil pipe cutting time is less than 15min.
In the description of the present invention, it should be understood that, if any, the terms "left," "inner," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, rather than indicate or imply that the devices or elements being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms describing the positional relationship in the drawings are for illustration only and are not to be construed as limiting the invention.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
Claims (8)
1. The utility model provides a gas well oil pipe area presses operation cutting tool which characterized in that: the device comprises a lower shell (1), a rotating shaft (2), a power mechanism, a feed mechanism and an upper shell (11), wherein the upper shell (11) is connected to the upper surface of the lower shell (1), the rotating shaft (2) is axially connected to the inner part of the lower shell (1), the power mechanism is connected with the feed mechanism, and the power mechanism and the feed mechanism are both connected to the outside of the rotating shaft (2); the power mechanism comprises a sliding block lifting disc (6) and a pushing component, the sliding block lifting disc (6) is sleeved outside the rotating shaft (2), the pushing component is connected with the lower surface of the sliding block lifting disc (6), and the pushing component is connected with the outside of the rotating shaft (2); the pushing component comprises a turbine (4) and a worm (5), and the worm (5) is respectively connected with the sliding block lifting disc (6) and the rotating shaft (2) through the turbine (4); the cutter feeding mechanism comprises a sliding block (7), a cutter bar righting block (8), a cutter bar (9) and a cutter (17), wherein a groove (18) is formed in the middle of the sliding block (7) from top to bottom, the sliding block lifting disc (6) is connected below the sliding block (7), the cutter bar righting block (8) is connected with a rotating shaft (2) and the cutter bar righting block (8) is located in the groove (18), the cutter bar (9) is respectively connected with the sliding block (7) and the cutter bar righting block (8), the cutter (17) is connected with the cutter bar (9) and the cutter (17) is horizontally located inside the cutter bar righting block (8).
2. The gas well oil tube pressurized working cutting tool of claim 1, wherein: the cutter bar (9) is connected with the sliding block (7) and the cutter bar centralizing block (8) through the pin shaft (16).
3. The gas well oil tube pressurized working cutting tool of claim 1, wherein: the number of the cutter feeding mechanisms is multiple, and the cutter feeding mechanisms of the cutter sleeves are circumferentially and equidistantly connected to the outside of the rotating shaft (2).
4. The gas well oil tube pressurized working cutting tool of claim 1, wherein: the sliding block (7) is provided with a groove (19) from left to right, and the cutter bar (9) is movably connected with the groove (19).
5. The gas well oil tube pressurized working cutting tool of claim 1, wherein: the device also comprises a dustproof piece (12), and the dustproof piece (12) is sleeved outside the upper part of the rotating shaft (2).
6. The gas well oil tube pressurized working cutting tool of claim 1, wherein: the device also comprises a sealing element (13), and the sealing element (13) is connected between the lower shell (1) and the upper shell (11).
7. The gas well oil tube pressurized working cutting tool of claim 1, wherein: the rotary shaft (2) is connected in the lower shell (1) through the bearing (3).
8. A cutting method based on the gas well oil pipe pressurized operation cutting tool according to any one of claims 1-7, characterized in that: the method comprises the following steps:
during cutting, the worm (5) drives the turbine (4) to rotate positively, the sliding block lifting disc (6) moves upwards, the sliding block (7) extrudes the cutter bar (9) and the cutter (17), and the cutter bar (9) and the cutter (17) move radially to finish one-time cutting;
when the tool is retracted, the worm (5) drives the turbine (4) to reversely rotate, the sliding block lifting disc (6) moves downwards, and the sliding block (7) drives the cutter bar (9) and the cutter (17) to move to complete one-time tool retraction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110358927.2A CN115162991B (en) | 2021-04-02 | 2021-04-02 | Gas well oil pipe pressurized operation cutting tool and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110358927.2A CN115162991B (en) | 2021-04-02 | 2021-04-02 | Gas well oil pipe pressurized operation cutting tool and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115162991A CN115162991A (en) | 2022-10-11 |
| CN115162991B true CN115162991B (en) | 2023-11-07 |
Family
ID=83476112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110358927.2A Active CN115162991B (en) | 2021-04-02 | 2021-04-02 | Gas well oil pipe pressurized operation cutting tool and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115162991B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203018823U (en) * | 2012-12-27 | 2013-06-26 | 中国石油集团川庆钻探工程有限公司 | Cutting tool for operation under pressure |
| CN204532192U (en) * | 2015-01-23 | 2015-08-05 | 中国石油天然气股份有限公司 | Well head area is pressed to cut and is decomposed drilling tool device |
| CN209189903U (en) * | 2018-12-28 | 2019-08-02 | 中铝兴业供应链(天津)有限公司 | A kind of aluminum pipe cutting machine |
| CN209970831U (en) * | 2019-04-19 | 2020-01-21 | 广州市民彩新材料科技有限公司 | Cutting device is used in composite tube production |
| CN211407567U (en) * | 2019-12-23 | 2020-09-04 | 江门维智德智能商用厨房设备有限公司 | Semi-automatic coconut machine of opening |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6827145B2 (en) * | 1997-01-29 | 2004-12-07 | Weatherford/Lamb, Inc. | Methods and apparatus for severing nested strings of tubulars |
| US11220865B2 (en) * | 2019-02-25 | 2022-01-11 | Schlumberger Technology Corporation | Downhole drilling apparatus with rotatable cutting element |
| US11008824B2 (en) * | 2019-08-20 | 2021-05-18 | Saudi Arabian Oil Company | Vertically cutting downhole tubulars |
-
2021
- 2021-04-02 CN CN202110358927.2A patent/CN115162991B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203018823U (en) * | 2012-12-27 | 2013-06-26 | 中国石油集团川庆钻探工程有限公司 | Cutting tool for operation under pressure |
| CN204532192U (en) * | 2015-01-23 | 2015-08-05 | 中国石油天然气股份有限公司 | Well head area is pressed to cut and is decomposed drilling tool device |
| CN209189903U (en) * | 2018-12-28 | 2019-08-02 | 中铝兴业供应链(天津)有限公司 | A kind of aluminum pipe cutting machine |
| CN209970831U (en) * | 2019-04-19 | 2020-01-21 | 广州市民彩新材料科技有限公司 | Cutting device is used in composite tube production |
| CN211407567U (en) * | 2019-12-23 | 2020-09-04 | 江门维智德智能商用厨房设备有限公司 | Semi-automatic coconut machine of opening |
Non-Patent Citations (1)
| Title |
|---|
| 孙虎 ; 徐迎新 ; 张冕 ; 杨红斌 ; 陈松 ; .苏里格苏48-17某井带压作业工艺设计与现场施工.钻采工艺.2013,(02),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115162991A (en) | 2022-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106437590B (en) | Hydraulic cutting device for deep sea cutting casing | |
| CN101550811B (en) | Lifting full water depth outer suspension clutch unlock underwater well head cutting recovery combined tool | |
| CN103821467B (en) | A kind of automatic drilling machine hydraulic power chuck | |
| CN115162991B (en) | Gas well oil pipe pressurized operation cutting tool and method | |
| CN113996837A (en) | Low-cost multi-direction mould processing equipment | |
| CN109681144B (en) | Integrated deep sea sleeve cutting and salvaging device | |
| CN105114024A (en) | Hydraulic-drive rotating type drill tool ejection preventer | |
| CN116160072B (en) | Wellhead casing thread machining device | |
| CN102528526A (en) | Retractable swing boring and milling head | |
| CN209761375U (en) | cutting and recycling tool for deep water casing | |
| CN101949268A (en) | Rotating joint | |
| CN209761377U (en) | Well head jackscrew voussoir step device | |
| US3496587A (en) | Drill mechanism for sponge iron reactors and the like | |
| CN101550810A (en) | Outer suspension positioning mechanism of an underwater cutting tool | |
| CN111022015B (en) | Horizontal well open hole staged fracturing pipe column well descending device | |
| CN211342828U (en) | Punching device for sampling rock soil in oil field exploration | |
| CN210756387U (en) | Manual clamping mechanism | |
| CN101614118B (en) | Clutch unlocking and rotating mechanism of underwater cutting tool | |
| CN207138866U (en) | Four main ultra-precise cutting machining center | |
| CN113996830A (en) | Mould processing equipment | |
| CN203936647U (en) | A kind of annular hydraulic cylinder lockable mechanism | |
| CN114016939A (en) | Dismounting device of oil drilling equipment | |
| CN109915046B (en) | Rotary seal loading process and device for minor repair operation | |
| CN206839712U (en) | A kind of vertical lathe with waterproof effect | |
| CN204487699U (en) | The Line boring machine of fast demountable main spindle box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |