CN2457208Y - Differential drilling and reaming hole purpose machine capable of detecting and controlling - Google Patents
Differential drilling and reaming hole purpose machine capable of detecting and controlling Download PDFInfo
- Publication number
- CN2457208Y CN2457208Y CN 01201133 CN01201133U CN2457208Y CN 2457208 Y CN2457208 Y CN 2457208Y CN 01201133 CN01201133 CN 01201133 CN 01201133 U CN01201133 U CN 01201133U CN 2457208 Y CN2457208 Y CN 2457208Y
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- reaming
- shaft
- rig
- motor
- drill bit
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Abstract
The utility model relates to a differential drilling and reaming hole purpose machine capable of detecting and controlling. Control shafts are arranged in central through holes in the centers of sun wheel shafts and drilling machine shafts of a submersible electrical motor shaft and a planetary type decelerator; stopping of the shafts can be controlled; or identical-speed rotation of the shafts and the submersible electrical motor can be controlled by an electromagnetic brake which is arranged on the upper ends of the shafts and an electromagnetic clutch; a transverse beam of a drill head is arranged on the drill head; two reaming hole cutter bars which are provided with hock cutters on the head portion are symmetrically arranged under the transverse beam, and the central shaft of the drill head and the transverse beam of the drill head can drive the reaming hole cutter bar to make horizontal, telescoping, and reaming hole motion through a differential driving mechanism. The sides of the electrical motor shaft and the control shafts are provided with two groups of detectors of rotation number which can detect the rotation number of the electric motor shaft and the control shafts, and requirements of various reaming hole shapes can be satisfied.
Description
The utility model belongs to the rig that the construction work pile foundation construction is used, and is mainly used in the brill reaming construction of multistage reaming stake.
Current, the pore-forming problem around multistage reaming stake discloses multinomial patented technology scheme.For example: adopting two connecting rod stripper plates to rotate extruding hole wall one-tenth dish step by step in being drilled to the hole is that the patent of feature has (ZL89107846.0) and (ZL99205417.6); With drill bit hinged two connecting rod cornish bits on bar and the sliding sleeve quickly, making two connecting rod cornish bit cantilevers stretch out the rotary cutting reaming by extruding is that the patent of feature has (ZL95213581.2), (ZL97213085.3) and (ZL99228453.8); Stretching out the rotary cutting reaming with the rotation on disc enlarging machine output shaft extruding cornish bit by cantilever is that the patent of feature has (ZL97213123.8) and (ZL97213124.6).The technical scheme of the solution reaming problem that is proposed in the above-mentioned patent, owing to restricted by its selected reaming mode and bearizing mechanism, exist such as deficiency that the complex procedures of boring reaming twice moulding and efficient are supported, with because of the stressed unreasonable deficiency that causes the excessive and heavy poor efficiency of drill bit mechanism of cornish bit, and the problem that can not monitor and control the reaming process.
Can find after analyzing above-mentioned all kinds of patents technical scheme, all lack in its solution the improvement of improvement rig function and drill bit as a whole the key element in the solution unify to consider and improve design, but existing rig is used simply, and on the basis of conventional borehole idea, attempt only to solve the difficult problem of reaming, thereby have regret unavoidably by improvement to drill bit.
The purpose of this utility model, be on the basis of existing diving drill machine and drill bit structure, it is carried out the general improvements design, diving drill machine after the improvement has the output function of measurable and controllable twin shaft three speed, drill bit after the improvement has can be by the reaming knife bar of differential driving by the flexible reaming of fixed speed ratio, by Control Shaft the differential function of rig and drill bit organically is combined among this rig, makes this rig become a kind of novel measurable and controllable brill reaming combination rig.
The technical solution of the utility model: but the differential type of observing and controlling is bored the reaming combination rig, comprises submersible motor and the epicyclic type device and the rig axle that are connected in its underpart, and the rig axle is connected with drill bit, it is characterized in that:
A. in the central through hole that the sun wheel shaft and the rig axle center of submersible motor axle and epicyclic type device are offered, be provided with Control Shaft, the stall of Control Shaft or rotate with speed with submersible motor and to be subjected to the electromagnetic brake that its upper end is provided with and the control of electromagnetic clutch;
B., one drill bit crossbeam is arranged on drill bit top, and drill bit crossbeam bottom symmetry is horizontally disposed with the reaming knife bar that two heads have the hock cutter, and bit central axle and drill bit crossbeam drive the reaming knife bar by differential gear and do the flexible reaming campaign of level;
C. at motor shaft and the other two groups of revolution detectors that detect motor shaft and Control Shaft revolution that are provided with of Control Shaft.
The connecting ring that above-mentioned electromagnetic brake is installed by Control Shaft top, the upper armature above the connecting ring is formed with the static magnetic yokes that is packed in below the little end cap of motor, and when the static magnetic yokes energising, when upper armature and static magnetic yokes adhesive, the rotating speed of Control Shaft is zero.
The connecting ring that above-mentioned electromagnetic clutch is installed by Control Shaft top, the lower armature above the connecting ring is formed with the static magnetic yokes that is packed in the motor shaft upper end, and when the static magnetic yokes energising, when lower armature and static magnetic yokes adhesive, Control Shaft and motor shaft rotate with speed.
Above-mentioned differential gear be by bit central axle lower end bevel gear, by with the axle head bevel gear of two bevel gear shafts that rotate with speed with drill bit, bevel gear shaft other end bevel gear and corresponding worm shaft on the worm screw of bevel gear, worm shaft mesh successively with worm gear on the worm-wheel shaft that is connected the reaming knife bar and constitute.
Bearings under bearing that above-mentioned Control Shaft is covered by the motor small end and the motor shaft in the stomidium.
External thread sleeve engagement in the internal thread of above-mentioned two reaming knife bars and the differential gear on the worm-wheel shaft, its medial end has the knife bar end cover.
Above-mentioned two groups of revolution detectors are arranged on below the other static magnetic yokes of motor shaft and Control Shaft on the baffle ring and the inboard barrel of connecting ring outside electric motor end cap sleeve.
The utility model adopts in the sun wheel shaft of submersible motor axle in common diving drill machine and planetary reduction gear and the rig axle and offers central through hole, be provided with a Control Shaft in the hole, the Control Shaft upper end installs a connecting ring, the connecting ring upper and lower surface respectively is provided with the armature of a band edge fluted disc, upper armature be fixed on the electromagnetic brake that static magnetic yokes below the little end cap of motor and end-toothed disc have constituted Control Shaft, the electromagnetic clutch that lower armature and static magnetic yokes that is fixed on the motor shaft upper end and end-toothed disc have constituted Control Shaft.On the inboard barrel of sleeve of the static magnetic yokes of connecting ring and electromagnetic clutch outside electric motor end cap, also be provided be used to detect motor shaft revolution and Control Shaft revolution two groups by the revolution detector of forming near switch.
In rig, motor power drives the drill bit rotary drilling by the flange that is packed on the rig axle after the planetary reduction gear deceleration increases square; Inserted by its lower end spline axle head by the rotation of the Control Shaft of electromagnetic brake or electromagnetic clutch control to be delivered to differential type in the spline housing of bit central axle to bore in the dual-purpose drill bit of reaming, and formed differential gear because of the engagement of central axis lower end bevel gear and two bevel gear shaft axle head bevel gears of rotating with speed with drill bit.This differential gear with the differential of Control Shaft and drill speed by above-mentioned another axle head bevel gear of two bevel gear shafts respectively with the engagement of its worm shaft upper end, below bevel gear, and the engagement by worm and wormwheel drives worm-wheel shaft and axle and goes up external thread sleeve and rotate.The horizontal force that two external thread sleeves on the described worm-wheel shaft produce respectively with the engagement of the internal thread of its slip knife bar the time can drive two reaming knife bars that differential type bores on the dual-purpose drill bit of reaming simultaneously and do the constant speed flexible reaming campaign of level in opposite directions.
Work because of above-mentioned electromagnetic brake or electromagnetic clutch, make the control rotating speed on the Control Shaft have the opposite definite relation of the direction of differing in size with the differential of submersible motor rotating speed, and make the control rotating speed on the Control Shaft have the opposite relation of certainty ratio really of the direction of differing in size with output speed on the rig axle, also make the numerical value of reaming knife bar telescopic displacement and the revolution that drives the displacement of reaming knife bar with differential also have definite proportionate relationship.But therefore bore in the reaming combination rig, can pass through detection, determine the accurate numerical value of reaming the revolution of Control Shaft and the displacement of motor shaft driving reaming knife bar in the differential type of described observing and controlling; Electromagnetic brake or electromagnetic clutch conversion of operation state be can pass through, rig or boring or reaming determined, and the flexible state and the displacement numerical value of reaming knife bar during definite reaming.
The utility model has the following advantages according to prior art:
One, in overall dimensions that do not change common diving drill machine and boring function, by rational exploitation and utilization to idle space and idle function in its internal mechanism, make rig when keeping its simple and light advantage such as efficient, increased the function of reaming again, and therefore improvement makes that the merit of common diving drill machine is given full play to.
Two, the cornish bit level is stretched out the individual layer reaming, broken away from the reaming pattern that aforementioned cornish bit cantilever stretches out reaming, its 2 support stress forms make reaming knife bar and the stressed advantages of simple of bearing thereof, thereby can guarantee the flexibility of reaming knife bar motion and the reliability of flexible reaming.
Three, to the common diving drill machine that has only the single borehole function after redesign and improving, make the differential shaft that can drive two suits with the electric clutch-brake on a submersible motor and top thereof simultaneously.In drill bit box of tricks to two go up differentials relatively after, drill bit can be holed, again can reaming, also make drill bit its reaming knife bar when reaming can stretch out the reaming cutting at a slow speed, the drill bit of shrinking back back fast again, and make the direction of cornish bit telescopic displacement only relevant with the state of a control of electric clutch-brake, the size of its telescopic displacement only with how many ratios of the revolution of motor-driven reaming knife bar motion.This reaming whether with the corresponding relation of the state of a control of electric clutch-brake, with what proportionate relationship of reaming size and motor-driven revolution, not only make the boring of rig and the detection and the programme-control of reaming process are become simple and easy to do, also make this rig can satisfy the requirement of multiple reaming shape.
Four, the diving after improvement bores in the reaming combination rig, the function of cornish bit layering reaming and combination to cornish bit motion state monitoring and presetting apparatus, people can monitored that to the reaming process of rig under in depth the hope with programme-control comes true on the ground for a long time, therefore can break away from the disordered state of existing reaming process need Artificial Control black-box operation, and make the quality of reaming be controlled and ensure.
Below in conjunction with accompanying drawing preferred embodiment of the utility model is described in further detail.
But Fig. 1 is the differential type of observing and controlling of the present utility model bores the sectional drawing of reaming combination rig optimum implementation.
Fig. 2 is the sectional view that further specifies the part amplification of electric clutch-brake among Fig. 1;
Fig. 3 is Figure 1A-A sectional drawing;
Fig. 4 is Figure 1B-B sectional drawing;
Fig. 5 is Fig. 1 C-C sectional drawing.
Wherein: rig 1, submersible motor 2, motor shaft 3, Control Shaft 4, static magnetic yokes 5, connecting ring 6,
Static magnetic yokes 7, power cable 8, control cables 9, motor small end lid 10, upper bearing (metal) 11,
Revolution is examined fast device 12, electric motor end cap 13, and sliding bearing 14, planetary reduction gear 15, sun wheel shaft 16,
Rig axle 17, flange 18, drill bit 19, bit central axle 20, bevel gear shaft 21,
Reaming knife bar 22, external thread sleeve 23, worm-wheel shaft 24, knife bar end cover 25, worm gear 26,
Knife bar backplate 32, baffle ring 52, upper armature 61, lower armature 62.
But the differential type of observing and controlling shown in Figure 1 is bored reaming combination rig 1, is the power transmission route that has been made of rig 1 boring submersible motor 2, planetary reduction gear 15, rig axle 17 and axle upper flange 18.At this moment, power cable 8 is passed into electric current the stator coil of submersible motor 2, rotor and motor shaft 3 are rotated, axle 3 connects sun wheel shaft 16 and star-wheel and the planetary wheel carrier rotation that drives on the star reducer 15 by spline, and the rig axle 17 that driving and planetary wheel carrier are connected rotates, be connected by the flange of the flange on the rig 17 18, transmission of power is given drill bit 19 and driven drill bit 19 rotary drillings with drill bit 19.
For making rig 1 form differential output, drive the electromagnetic clutch that yoke 5 and end-toothed disc thereof have constituted Control Shaft 4 at motor shaft 3, sun wheel shaft 16 and rig axle 17 centers.If a central through hole is set up a Control Shaft 4 in the hole, this is supported by upper bearing (metal) 11 on the motor small end lid 10 and the sliding bearing in 3 times stomidiums of motor shaft 14.Install a connecting ring 6 on Control Shaft top, the connecting ring upper and lower surface respectively is provided with the armature of a band edge fluted disc, the upper armature 61 of connecting ring 6 be packed in the electromagnetic brake that static magnetic yokes 7 below the motor small end lid 10 and end-toothed disc thereof have constituted Control Shaft 4, the lower armature 62 of connecting ring 6 be packed in the static magnetic yokes 5 of motor shaft 3 upper ends and the electromagnetic clutch that end-toothed disc has constituted Control Shaft 4 thereof.
The control electric current makes upper armature 61 and static magnetic yokes 7 adhesives on the connecting ring 6 under its magnetic field force effect when control cables 9 feeds the coil of static magnetic yokes 7, and to make Control Shaft 4 rotating speeds be zero; When the control electric current feeds the coil of static magnetic yokes 5, under its magnetic field force effect, make lower armature 62 and static magnetic yokes 5 adhesives on the connecting ring 6, and Control Shaft 4 and motor shaft 3 are rotated with speed, this output characteristics that makes Control Shaft 4 exportable different control rotating speeds because of described electromagnetic clutch is different with the electromagnetic brake duty, make and improve back submersible motor 1 and also have the output function of twin shaft three speed, thereby can be the reaming knife bar stretching motion that bores the dual-purpose drill bit 19 of reaming needed differential is provided.
Shown in Fig. 1,2, under the electromagnetic clutch static magnetic yokes below 5 on the inboard barrel of baffle ring 52 and connecting ring 6 outside electric motor end caps 13 sleeves, two groups that are provided with by the revolution detector of forming near switch 121,122, detect the driving revolution and the Control Shaft 4 control revolutions of motor shaft 3 when being used for reaming, and can determine to drive the control revolution of reaming knife bar 22 telescopic displacements and the difference of drill bit revolution in view of the above.Also difference is determined the situation of reaming knife bar 22 displacements in view of the above, and provides foundation for the process control of reaming.
Differential type shown in Fig. 1,3,4 is bored the dual-purpose drill bit 19 of reaming, is to have added a drill bit crossbeam 28 between two parties on the correcting circle 31 of common diving drill bit, is provided with two parallel and reaming knife bars 22 that can horizontal telescopic slide in crossbeam 28 web bilateral symmetry.Be provided with internal thread in reaming knife bar 22 centre bores, its overhanging end is provided with the hock cutter, stretch into worm-wheel shaft 24 in knife bar 22 holes from the open-work of knife bar end cover 25, the affixed external thread sleeve 23 in its end has formed the screw pair that can drive knife bar 22 stretching motions during with the engagement of hole internal thread.Be connected with crossbeam loam cake 29 in the formed drill bit crossbeam annular seal space at drill bit crossbeam 28, the upper end links to each other with Control Shaft 4 with spline housing, and by the bit central axle 20 that is installed in two bearings, 30 supports in the drill bit 19, the engagement of its lower end bevel gear and the axle head bevel gear of two bevel gear shafts 21 that are symmetrical arranged and rotate with speed with drill bit has formed a cover differential gear among drill bit 19.Bevel gear shaft 21 is when rotating with speed with drill bit 19, under the differential action of the control rotating speed of bit central axle 20 and drill bit 19 rotating speeds, make bevel gear shaft 21 produce rotation, this rotation rotates worm shaft 27 by axle 21 another axle head bevel gears by the engagement with worm shaft 27 upper end bevel gears, engagement by worm and wheel 26 on the axle 27 is rotated the external thread sleeve 23 on worm gear 26, worm-wheel shaft 24 and the axle again, and, make reaming knife bar 22 can be used as horizontal stretching motion because of the effect of reaming knife bar centre bore inside spin axial force that secondary motion produces.
Bore in the dual-purpose drill bit 19 of reaming in described differential type, for make on the drill bit 19 two in opposite directions the reaming 22 of stretching motion when stretching out reaming, drill bit 19 is in dynamic equilibrium state, in two driving-chains that drive 22 motions of two reaming knife bars, the physical dimension of corresponding part is identical, and therefore makes the gearratio of two driving-chains both identical and be definite value.Because the planetary reduction gear gearratio of rig 1 is a definite value, so the displacement when driving the flexible reaming of reaming knife bar 22 by twin shaft input differential in the utility model, proportional with the control rotating speed of described Control Shaft 4 with the differential of rig axle 17 driving rotating speeds.By revolution detector 12 when the reaming to the detection of the driving revolution of motor shaft 3 with to the detection of Control Shaft 4 control revolutions, not only can in time confirm, also detect the fault of judging the reaming driving-chain by described revolution to cornish bit displacement situation and then to the size of reaming.
But described observing and controlling differential type bore in the reaming combination rig 1, since the adhesive of electromagnetic brake control rotating speed be zero or the adhesive of electromagnetic clutch 5,6 to make the control rotating speed be motor speed, and make the above-mentioned control rotating speed and the difference of drill speed have the characteristic that direction is opposite, vary in size.But therefore bore in the reaming combination rig, utilize above-mentioned characteristic to make reaming knife bar 22 realize stretching out at a slow speed reaming and rapid return in the differential type of this observing and controlling.Above-mentioned reaming knife bar 22 telescopic displacements drive the proportional measurability of difference of revolution with it, with reaming knife bar 22 directions of motion and speed and the relevant controllability of electric clutch- brake 5,6,7 duties, make that not only boring expansion combination rig 1 has the function that can carry out reaming under numerical value detection and programme-control, also making becomes possibility to its reaming process implementation ground surveillance.
As shown in Figure 1, 2, two groups detect respectively motor shaft revolution and Control Shaft revolution by the revolution detector of forming near switch 121 and 122, its probe should be aimed at the flange on baffle ring 52 and the connecting ring 6 respectively.Flange on baffle ring 52 and the connecting ring 6 should be symmetrical arranged in pairs.
Shown in Fig. 1,3, two horizontally disposed reaming knife bars are with the bit central plane N--N is parallel, and are provided with about the N--N plane symmetry.
Shown in Fig. 1,3,4, on drill bit 19 in the annular seal space, the vertical guide at worm shaft 27 places that two horizontally disposed conical tooth shafts 21 and two perpendicular values are provided with presss from both sides a angles with bit central plane N-N, and a＞2 °.
Shown in Fig. 3,5, on drill bit correcting circle 31, offer and the consistent through hole of reaming knife bar cross sectional shape, this through hole and the knife bar backplate 32 that is fixed on drill bit frame crossbeam 28 both sides have constituted the constraint and the support of reaming knife bar 22 telescopic slide.
Be equipped with spring bearing on each axis of rotation in this rig 1 and the dual-purpose drill bit 19 of differential type brill reaming, be equipped with sealing device at each inner chamber and outside adjacent regions, because of related bearing and sealing do not have big influence so do not make reference to structure of the present utility model and operating principle are described.
In a word, above-mentioned detailed description and illustrated be that an available numerical value detects and programme controlled differential type brill reaming combination rig.It is applicable in the multistage reaming stake pore-forming boring and in the hole any part carry out the reaming of various revolution shape.
Claims (7)
1, but a kind of differential type of observing and controlling is bored the reaming combination rig, comprises submersible motor and the epicyclic type device and the rig axle that are connected in its underpart, and the rig axle is connected with drill bit, it is characterized in that:
A. in the central through hole that the sun wheel shaft and the rig axle center of submersible motor axle and epicyclic type device are offered, be provided with Control Shaft, the stall of Control Shaft or rotate with speed with submersible motor and to be subjected to the electromagnetic brake that its upper end is provided with and the control of electromagnetic clutch;
B., one drill bit crossbeam is arranged on drill bit top, and drill bit crossbeam bottom symmetry is horizontally disposed with the reaming knife bar that two heads have the hock cutter, and bit central axle and drill bit crossbeam drive the reaming knife bar by differential gear and do the flexible reaming campaign of level;
C. at motor shaft and the other two groups of revolution detectors that detect motor shaft and Control Shaft revolution that are provided with of Control Shaft.
2, but the differential type of observing and controlling according to claim 1 is bored the reaming combination rig, it is characterized in that: the connecting ring that described electromagnetic brake is installed by Control Shaft top, upper armature above the connecting ring is formed with the static magnetic yokes that is packed in below the little end cap of motor, when the static magnetic yokes energising, when upper armature and static magnetic yokes adhesive, the rotating speed of Control Shaft is zero.
3, but the differential type of observing and controlling according to claim 1 is bored the reaming combination rig, it is characterized in that: the connecting ring that described electromagnetic clutch is installed by Control Shaft top, lower armature above the connecting ring is formed with the static magnetic yokes that is packed in the motor shaft upper end, when the static magnetic yokes energising, when lower armature and static magnetic yokes adhesive, Control Shaft and motor shaft rotate with speed.
4, but the differential type of observing and controlling according to claim 1 is bored the reaming combination rig, it is characterized in that: described differential gear be by bit central axle lower end bevel gear, by with the axle head bevel gear of two bevel gear shafts that rotate with speed with drill bit, bevel gear shaft other end bevel gear and corresponding worm shaft on the worm screw of bevel gear, worm shaft mesh successively with worm gear on the worm-wheel shaft that is connected the reaming knife bar and constitute.
5, but the differential type of observing and controlling according to claim 1 is bored the reaming combination rig, it is characterized in that: the bearings under bearing that described Control Shaft is covered by the motor small end and the motor shaft in the stomidium.
But 6, bore the reaming combination rig according to the differential type of claim 1 or 4 described observing and controlling, it is characterized in that: the external thread sleeve engagement in the internal thread of described two reaming knife bars and the differential gear on the worm-wheel shaft, its medial end has the knife bar end cover.
7, but the differential type of observing and controlling according to claim 1 is bored the reaming combination rig, it is characterized in that: described two groups of revolution detectors are arranged on below the other static magnetic yokes of motor shaft and Control Shaft on the baffle ring and the inboard barrel of connecting ring outside electric motor end cap sleeve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01201133 CN2457208Y (en) | 2001-01-15 | 2001-01-15 | Differential drilling and reaming hole purpose machine capable of detecting and controlling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01201133 CN2457208Y (en) | 2001-01-15 | 2001-01-15 | Differential drilling and reaming hole purpose machine capable of detecting and controlling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2457208Y true CN2457208Y (en) | 2001-10-31 |
Family
ID=33623255
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01201133 Expired - Lifetime CN2457208Y (en) | 2001-01-15 | 2001-01-15 | Differential drilling and reaming hole purpose machine capable of detecting and controlling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2457208Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454365A (en) * | 2010-10-18 | 2012-05-16 | 中冶交通工程技术有限公司 | Drilling bit for forming branches of branch pile |
| CN103306606A (en) * | 2013-06-28 | 2013-09-18 | 中国地质大学（武汉） | Planetary gear train energy-saving dual-layer drill for drilling of deep oil gas well |
| CN111779449A (en) * | 2020-07-09 | 2020-10-16 | 浙江省工程物探勘察设计院有限公司 | Foundation well drilling device for building and using method |
-
2001
- 2001-01-15 CN CN 01201133 patent/CN2457208Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102454365A (en) * | 2010-10-18 | 2012-05-16 | 中冶交通工程技术有限公司 | Drilling bit for forming branches of branch pile |
| CN102454365B (en) * | 2010-10-18 | 2014-09-24 | 中冶交通工程技术有限公司 | Drilling bit for forming branches of branch pile |
| CN103306606A (en) * | 2013-06-28 | 2013-09-18 | 中国地质大学（武汉） | Planetary gear train energy-saving dual-layer drill for drilling of deep oil gas well |
| CN111779449A (en) * | 2020-07-09 | 2020-10-16 | 浙江省工程物探勘察设计院有限公司 | Foundation well drilling device for building and using method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| C20 | Patent right or utility model deemed to be abandoned or is abandoned |