CN102536113A - Underground electric drill device and method capable of reducing torque borne by drill stem - Google Patents
Underground electric drill device and method capable of reducing torque borne by drill stem Download PDFInfo
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- CN102536113A CN102536113A CN2012100527152A CN201210052715A CN102536113A CN 102536113 A CN102536113 A CN 102536113A CN 2012100527152 A CN2012100527152 A CN 2012100527152A CN 201210052715 A CN201210052715 A CN 201210052715A CN 102536113 A CN102536113 A CN 102536113A
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Abstract
The invention provides an underground electric drill device and method capable of reducing the torque borne by a drill stem. The underground electric drill device is mounted between a drill collar and a drill bit and comprises two parts, namely a fixed power short circuit and a rotary rock breaking short circuit, wherein the upper end of the fixed power short circuit is connected with the drill collar; and two motors are symmetrically mounted on a metal cylindrical wall of the fixed power short circuit and are respectively connected with a conical gear. The lower end of the rotary rock breaking short circuit is connected with the drill bit; and gear teeth are arranged at the upper end of the rotary rock breaking short circuit. The lower end of the fixed power short circuit is connected with the upper end of the rotary rock breaking short circuit through a bearing and then two conical gears on the fixed power short circuit are simultaneously meshed with the gear teeth at the upper end of the rotary rock breaking short circuit; and the fixed power short circuit and the rotary rock breaking short circuit can relatively rotate on the axis extension line. According to the device and the method, the torque borne by the drill stem in the drilling process can be greatly reduced, the safety of drilling operation is enhanced, the service life of the drill stem is prolonged, and the exploration expenses of oil and gas fields are reduced; and the device and the method can be suitable for drilling deep wells and ultra-deep wells of oil and natural gas.
Description
Technical field
The present invention relates to a kind of down-hole electrodrill that is the power transmission medium with two driving wheel conical gear combining structures, can obviously reduce the suffered moment of torsion of drill string in oil, the gas drilling process, for oil drilling provides a kind of new equipment and method.
Background technology
Distortion sign when circular shaft reverses is the relative rotation of two cross section spaced winding axles, and this is angle of torsion just.Design formulas is following:
Wherein: the relative rotation of coiled between two cross sections of
-circular shaft;
Moment of torsion between
-two cross sections;
Distance between
-two cross sections;
Can find out by formula (1); One regularly as
, and the relative rotation of coiled
is directly proportional with the length
of circular shaft between two cross sections of circular shaft.
Can find out by formula (1), in traditional rotary drilling process, because the length of drill string is very long; The moment of torsion that well head and shaft bottom produce causes very big torsional deflection to drill string; And produce spin friction between the drilling rod and the borehole wall, this infringement to drilling rod is very big, and the cost of making drilling rod is also very high.
The underground power drilling prodigiosin reduces the torsional deflection of drill string in the drilling process, and in the existing mud motor, and electronic commentaries on classics tool compared with the unique advantage that turbodrill and helicoid hydraulic motor have more is:
1, energy does not rely on flowing of drilling fluid from ground to the transmission of drill bit;
2, can use different drilling fluid media;
3, electric energy can make things convenient for, be converted into efficiently the energy of other form;
4, through boosted voltage, the energy loss in the transmission course can be reduced, therefore constant high power can be kept;
5, use electrodrill; The interrelated data of down-hole performances of rock can be explained by the service performance of drill bit; The change of the drill bit moment of resistance can be reacted directly on the electric current and power of electronic commentaries on classics tool motor in drilling process; Can allow to use automatic technology and telecontrol engineering at the Ground Control drilling process in view of the above, realized the information management function in the drilling process.
The prior electric drilling tool still has many deficiencies, and is relatively poor like reliability, and after armature winding lost efficacy, reparation difficulty, the particularly extensional vibration of tricone bit were severe, and the operating mode of electrodrill is abominable.
Because the prior electric drilling tool is in broken rock process, the suffered moment of resistance of drill bit and rock contact position is an in the vertical direction, then still can on a part of drill string, produce reaction torque, therefore still has the part drill string can bear certain moment of torsion, produces torsional deflection.
Summary of the invention
The purpose of this invention is to provide a kind of method and device that reduces the suffered moment of torsion of drill string in the drilling process, this method and apparatus utilizes two driving wheel conical gear combinations as the power transmission medium, can offset most moment of torsion at the downhole drill bit place.
For achieving the above object, the present invention adopts following technical scheme: between drill collar and drill bit, apparatus of the present invention are installed, apparatus of the present invention partly are made up of the broken rock short circuit two of stationary power short circuit and rotation.Stationary power short circuit upper end connects with drill collar through box thread, and symmetry is equipped with two motors on the metal barrel of stationary power short circuit, and the bottom head covers of two motors is relative; Rotor coaxial and rotating shaft are in the horizontal direction; Two motors connect with a conical gear separately, and in the power input process, the conical gear that two motors drive separately simultaneously and connected rotates; And the direction of rotation of two conical gears is opposite; The suffered moment of torsion of two motors equal and opposite in direction in the horizontal direction thus, in the opposite direction, two moments of torsion are cancelled out each other.The broken rock short circuit lower end of rotation connects with drill bit through box thread; The upper end of the broken rock short circuit of rotation has the gear teeth; And these gear teeth Design and Machining on taper seat, the gear teeth of similar conical gear, these gear teeth be used for the stationary power short circuit on the engagement of two conical gears.Stationary power short circuit lower end connects through bearing with the broken rock short circuit of rotation upper end; After the connection; The stationary power short circuit is coaxial with the broken rock short circuit of rotation; And two conical gears on the stationary power short circuit simultaneously with the gear teeth meshing of the broken rock short circuit of rotation upper end, the stationary power short circuit can prolong on the axis direction with the broken rock short circuit of rotation and relatively rotates.
The concrete grammar of stationary power short circuit input power and offset torque is: broken rock power is provided by two motors, and two motors are carried electric current by ground power supply through the lead that is fixed on the drilling rod.Two motor symmetries are installed on the metal barrel of stationary power short circuit, and the bottom head covers of two motors is relative, and rotor coaxial and rotating shaft are in the horizontal direction.Two such mounting meanss of motor have guaranteed that two motors feed when electric current rotates in the same way; Because the bottom head covers of two motors is relative; Then the rotor of two motors rotation direction in the horizontal direction is opposite; For example: turn left from the right side and to look, if the rotor of a motor is toward the clockwise direction rotation, then the rotor of another motor must be toward rotation counterclockwise.Thus, the moment of torsion that two motors bear separately is all on a horizontal linear, and equal and opposite in direction, and is in the opposite direction, can cancel out each other.Two motors connect with a conical gear separately; In the power input process; The conical gear that two motors drive separately simultaneously and connected rotates, and the direction of rotation of two conical gears is opposite, thus two moments of torsion that motor bore equal and opposite in direction in the horizontal direction; In the opposite direction, two moments of torsion are cancelled out each other.
The concrete grammar that the broken rock short circuit of rotation drives the broken rock of drill bit rotation is: the upper end of the broken rock short circuit of rotation has the gear teeth; And these gear teeth Design and Machining on taper seat; The gear teeth of similar conical gear, these gear teeth be used for the stationary power short circuit on the engagement of two conical gears.The broken rock short circuit of rotation upper end connects with the stationary power short circuit through bearing; After the connection; The stationary power short circuit is coaxial with the broken rock short circuit of rotation; And two conical gears engagements on the gear teeth of the broken rock short circuit of rotation upper end and the stationary power short circuit, stationary power short circuit and rotation are broken the rock short circuit and can be prolonged on the axis direction and relatively rotate.When two conical gears of stationary power short circuit rotate; Two conical gears are driving wheels; The broken rock short circuit of rotation is a driven pulley; Two coefficient final effects of conical gear are that the broken rock short circuit of driven rotary rotates toward a direction, and the rotation direction of two conical gears is rotated the direction of rotation in the vertical direction of broken rock short circuit in the horizontal direction.The broken rock short circuit lower end of rotation connects with drill bit through box thread, promptly can drive the broken rock of drill bit rotation.
Two motors are high-power, high moment of torsion alternating current generator, guarantee broken rock required drive.
The stationary power short circuit is high-strength metal material with the manufacturing materials of the broken rock short circuit of rotation and two conical gears; Guarantee that two motors are on the metal barrel of stationary power short circuit in the offset torque process; The each side intensity of stationary power short circuit metal barrel can both meet the demands; And conical gear is in the process of the broken rock short circuit transferring power of rotation, and the intensity at each gear teeth meshing place can meet the demands.
One umbrella shape protection structure is arranged on stationary power short circuit top, and the big drilling cuttings that produces when being used to prevent brokenly rock causes blocked portion or other destruction to conical gear.
Each concrete size and parameter partly of apparatus of the present invention should be met lithology according to intending drilling well eye size, boring, power of motor, and parameters such as motor maximum torque design.
Advantage of the present invention is: device can reduce the moment of torsion that drill string bore in the drilling process significantly, thereby improves the safety of drillng operation, in the application life that increases drill string, reduces the exploitation of oil-gas field expense.
Description of drawings
Fig. 1 is now by the front view (analysing and observe) of the conical gear engagement figure of extensive utilization.
Fig. 2 is the right view of Fig. 1.
Fig. 3 is the engagement figure of a kind of pair of driving wheel conical gear combining structure, is cardinal principle figure of the present invention.
Fig. 4 is the front view (analysing and observe) of the structural representation of stationary power short circuit.
Fig. 5 is the right view of Fig. 4.
Fig. 6 is the front view (analysing and observe) of the structural representation of the broken rock short circuit of rotation.
Fig. 7 is the right view of Fig. 6.
Fig. 8 is the front view (analysing and observe) that the engagement figure of rock short circuit is broken in single conical gear and rotation.
Fig. 9 is the right view of Fig. 8.
Figure 10 is the front view (analysing and observe) of assembly structure sketch map of the present invention.
Figure 11 is the right view of Figure 10.
The specific embodiment
Below in conjunction with accompanying drawing, describe the present invention.
Like Fig. 1, shown in Figure 2, the conical gear combination is mainly used in the transmission between two concurrent aceses, and conical gear 1 is a driving wheel, and conical gear 2 is a driven pulley.If a conical gear 3 is installed again as driving wheel, then form two driving wheel conical gear combining structures as shown in Figure 3 on the right of Fig. 1 structure.
As shown in Figure 3; In two driving wheel conical gear combining structures, conical gear 1 all is a driving wheel with conical gear 3, and conical gear 2 is a driven pulley; The axis direction of conical gear 1 and conical gear 3 rotations in the horizontal direction, and the direction of rotation of conical gear 1 and conical gear 3 is opposite.The axis direction in the vertical direction of conical gear 2 rotations.For example: to the left conical gear 3 is to turn clockwise from the right side, and to the left conical gear 1 is rotated counterclockwise from the right side, sees from top to bottom that then conical gear 2 is to turn clockwise.Thus, the moment of torsion that conical gear 1 and conical gear 3 are born is equal and opposite in direction in the horizontal direction, and is in the opposite direction, can cancel out each other.
Like the structural representation of Fig. 4, stationary power short circuit 17 shown in Figure 5, motor M 1 and motor M 2 are installed on the metal barrel of stationary power short circuit 17, motor M 1 connects conical gear 4, and motor M 2 connects conical gears 5.In this structure, conical gear 4 is equivalent to the conical gear 1 in Fig. 3 structure, and conical gear 5 is equivalent to the conical gear 3 in Fig. 3 structure.Stationary power short circuit 17 upper ends connect with drill collar through box thread 8.7 pairs of conical gears of beveled structure 4 shield with conical gear 5, blocked portion or other infringement that the big drilling cuttings that produces when preventing well drilling and rock crushing causes conical gear.Crescent structure 9 is used for making drilling fluid successfully to flow into the broken rock short circuit 18 of rotation from 17 transition of stationary power short circuit, can prevent that drilling fluid from flowing in the connection slit of stationary power short circuit 17 and the broken rock short circuit 18 of rotation.
Break the structural representation of rock short circuit 18 like Fig. 6, rotation shown in Figure 7, the upper end of the broken rock short circuit 18 of rotation has the gear teeth 6, and the gear teeth 6 Design and Machining on taper seat, and the gear teeth 6 are similar to the gear teeth of conical gear 2 among Fig. 1.The gear teeth 6 be used for stationary power short circuit 17 on conical gear 4 mesh simultaneously with conical gear 5.Broken rock short circuit 18 lower ends of rotation connect with drill bit through box thread 10.
Like Fig. 8, shown in Figure 9; The gear teeth 6 engagements with conical gear 4 and broken rock short circuit 18 upper ends of rotation; Then this structure is with regard to similar structure shown in Figure 1, and conical gear 4 just is equivalent to the conical gear 1 in Fig. 1 structure, and the broken rock short circuit 18 of rotation just is equivalent to the conical gear 2 in Fig. 1 structure.
Like Figure 10, shown in Figure 11; With broken rock short circuit 18 assemblings of stationary power short circuit 17 and rotation; The power transmission principle of total is just as two driving wheel conical gear combining structures shown in Figure 3; Conical gear 4 just is equivalent to the conical gear 1 in Fig. 3 structure, and conical gear 5 just is equivalent to the conical gear 3 in Fig. 3 structure, and the broken rock short circuit 18 of rotation just is equivalent to the conical gear 2 in Fig. 3 structure; The gear teeth 6 engagements of conical gear 4 and 5 whiles of conical gear and broken rock short circuit 18 upper ends of rotation; Connect through bearing between stationary power short circuit 17 and the broken rock short circuit 18 of rotation, wherein: bearing 11, bearing 12, bearing 13, bearing 14 and bearing 15 all are deep groove ball bearings, and the effect of these five bearings is to guarantee that the broken rock short circuit 18 of stationary power short circuit 17 and rotation can in the vertical direction is coaxial relatively rotates.Bearing 16 is thrust ball bearings, and its effect is the pressure of the drill that is used to bear on the vertical direction, prevents that the pressure of the drill is to the damage of top five deep groove ball bearings and prevent the damage that the pressure of the drill causes conical gear 4, conical gear 5 and the gear teeth 6 engagement places.Total connects with drill collar through box thread 8, connects with drill bit through box thread 10.When creeping into, feed electric current in the same way in motor M 1 and the motor M 2, drive conical gear 4 simultaneously respectively and rotate with conical gear 5, then in the horizontal direction, the direction of rotation of conical gear 4 and conical gear 5 is opposite.For example: from the right side to the left, if conical gear 5 is to turn clockwise, then conical gear 4 must be to be rotated counterclockwise, and consequent final effect is: see that from top to bottom the broken rock short circuit 18 of rotation is to turn clockwise.Because the moment of torsion that motor M 1 and motor M 2 are born separately in this process is equal and opposite in direction, in the opposite direction in the horizontal direction, two moments of torsion are promptly cancelled out each other on the metal barrel of stationary power short circuit 17.Crescent structure 9 is used to block thrust ball bearing 16, prevents drilling fluid to its infringement that causes, and crescent structure 9 can make drilling fluid smooth transition from stationary power short circuit 17 flow in the broken rock short circuit 18 of rotation simultaneously.
Mainly designed two driving wheel conical gear combining structures among the present invention, two moments of torsion that driving wheel bore in this structure are equal and opposite in directions, in the opposite direction, so can cancel out each other.The principles of two driving wheel conical gear combining structures in this electrodrill, has been realized reducing significantly the moment of torsion that drill string bore in the drilling process.
?
Claims (7)
1. down-hole electrodrill device and method that can reduce the suffered moment of torsion of drill string; It is characterized in that: install and fix power short circuit (17) in the drill collar lower end; The broken rock short circuit (18) of rotation is installed in the drill bit upper end, and the broken rock short circuit (18) of stationary power short circuit (17) and rotation connects through deep groove ball bearing (11), deep groove ball bearing (12), deep groove ball bearing (13), deep groove ball bearing (14), deep groove ball bearing (15) and thrust ball bearing (16); Symmetry is equipped with two motor M 1 and M2 on the metal barrel of stationary power short circuit (17); The bottom head covers of motor M 1 and motor M 2 is relative; Rotor coaxial and rotating shaft in the horizontal direction, motor M 1 and conical gear (4) connect, conical gear (4) is used for and the gear teeth (6) that rotates broken on the rock short circuit (18) mesh; Motor M 2 and conical gear (5) connect; Conical gear (5) also is used for and rotates brokenly the gear teeth (6) engagement of rock short circuit (18) upper end, and in the power input process, motor M 1 drives the conical gear that is connected separately simultaneously with motor M 2 and rotates; One umbrella shape protection structure (7) is arranged on stationary power short circuit (17) top, and the big drilling cuttings that produces when being used to prevent brokenly rock causes blocked portion or other destruction to conical gear (4) and conical gear (5); In stationary power short circuit (17) bottom a crescent structure (9) is arranged; Be used for making drilling fluid successfully to flow into the broken rock short circuit (18) of rotation, can prevent that drilling fluid from flowing in the connection slit of stationary power short circuit (17) and the broken rock short circuit (18) of rotation from stationary power short circuit (17) transition; Stationary power short circuit (17) upper end connects with drill collar through box thread (8), and during broken rock, it is to rotate to break rock short circuit (18) power is provided that stationary power short circuit (17) drives conical gears (4) and conical gear (5) through motor M 1 and motor M 2; The upper end of the broken rock short circuit (18) of rotation has the gear teeth (6); And the gear teeth (6) Design and Machining on taper seat; The gear teeth of similar conical gear, the gear teeth (6) be used for stationary power short circuit (17) on the engagement of conical gear (4) and conical gear (5); Broken rock short circuit (18) lower end of rotation connects with drill bit through box thread (10), and the transmission of power that stationary power short circuit (17) is provided is to drill bit; The broken rock short circuit (18) of stationary power short circuit (17) and rotation connects through deep groove ball bearing (11), deep groove ball bearing (12), deep groove ball bearing (13), deep groove ball bearing (14), deep groove ball bearing (15) and thrust ball bearing (16); Wherein, deep groove ball bearing (11), deep groove ball bearing (12), deep groove ball bearing (13), deep groove ball bearing (14), deep groove ball bearing (15) are used to guarantee that stationary power short circuit (17) and the broken rock short circuit (18) of rotation can in the vertical direction is coaxial relatively rotate; Thrust ball bearing (16) is used to bear the axial load on the vertical direction; After the connection; Broken rock short circuit (18) in the vertical direction of stationary power short circuit (17) and rotation is coaxial; And conical gear (4) and conical gear (5) simultaneously with the gear teeth (6) engagement of the broken rock short circuit (18) of rotation upper end, stationary power short circuit (17) and rotation are broken rock short circuit (18) and can be prolonged on the axis direction and relatively rotate.
2. a kind of down-hole electrodrill device and method that reduces the suffered moment of torsion of drill string according to claim 1; It is characterized in that: the concrete grammar of described stationary power short circuit (17) input power and offset torque is: broken rock power is provided by motor M 1 and motor M 2, and motor M 1 is carried electric current by ground power supply through the lead that is fixed on the drilling rod with motor M 2; Motor M 1 is installed on the metal barrel of stationary power short circuit (17) with motor M 2 symmetries, and the bottom head covers of motor M 1 and motor M 2 is relative, and rotor coaxial and rotating shaft are in the horizontal direction; Such mounting means has guaranteed that motor M 1 and motor M 2 feed when electric current rotates in the same way; Because the bottom head covers of motor M 1 and motor M 2 is relative; Then the rotor rotation direction in the horizontal direction of motor M 1 and motor M 2 is opposite; For example: look if turn left from the right side, if the rotor of motor M 2 is toward the clockwise direction rotation, then the rotor of motor M 1 must be toward rotation counterclockwise; Thus, the moment of torsion that motor M 1 and motor M 2 are born separately is all on a horizontal linear, and equal and opposite in direction, and is in the opposite direction, can cancel out each other; In the power input process; Motor M 1 drives conical gear (4) simultaneously with motor M 2 and conical gear (5) rotates; And the direction of rotation of conical gear (4) and conical gear (5) is opposite; The moment of torsion that born of motor M 1 and motor M 2 equal and opposite in direction in the horizontal direction thus, in the opposite direction, two moments of torsion are cancelled out each other.
3. a kind of down-hole electrodrill device and method that reduces the suffered moment of torsion of drill string according to claim 1; It is characterized in that: the concrete grammar that the broken rock short circuit (18) of described rotation drives the broken rock of drill bit rotation is: the broken rock short circuit (18) of rotation upper end has the gear teeth (6); And the gear teeth (6) Design and Machining on taper seat; The gear teeth of similar conical gear, the gear teeth (6) be used for simultaneously with stationary power short circuit (17) on conical gear (4) mesh with conical gear (5); The broken rock short circuit (18) of rotation upper end connects with stationary power short circuit (17) through deep groove ball bearing (11), deep groove ball bearing (12), deep groove ball bearing (13), deep groove ball bearing (14), deep groove ball bearing (15) and thrust ball bearing (16); After the connection; The broken rock short circuit (18) of stationary power short circuit (17) and rotation is coaxial; And the gear teeth (6) of the broken rock short circuit (18) of rotation upper end simultaneously with stationary power short circuit (17) on conical gear (4) and conical gear (5) engagement, stationary power short circuit (17) breaks rock short circuit (18) and can prolong on the axis direction and relatively rotate with rotating; When conical gear (4) and conical gear (5) when rotating simultaneously; Conical gear (4) and conical gear (5) are driving wheels; The broken rock short circuit (18) of rotation is a driven pulley; Conical gear (4) and the coefficient final effect of conical gear (5) are that the broken rock short circuit (18) of driven rotary rotates toward a direction, and the rotation direction of conical gear (4) and conical gear (5) is rotated the direction of rotation in the vertical direction of broken rock short circuit (18) in the horizontal direction; Broken rock short circuit (18) lower end of rotation connects with drill bit through box thread (10), promptly can drive the broken rock of drill bit rotation.
4. a kind of down-hole electrodrill device and method that reduces the suffered moment of torsion of drill string according to claim 1; It is characterized in that: the mounting means of described motor M 1 and motor M 2 is: the bottom head covers of motor M 1 and motor M 2 is relative, and rotor coaxial and rotating shaft are in the horizontal direction.
5. a kind of down-hole electrodrill device and method that reduces the suffered moment of torsion of drill string according to claim 1; It is characterized in that: the upper end of the broken rock short circuit (18) of rotation has the gear teeth (6); And the gear teeth (6) Design and Machining on taper seat, the gear teeth of similar conical gear.
6. a kind of down-hole electrodrill device and method that reduces the suffered moment of torsion of drill string according to claim 1; It is characterized in that: after described conical gear (4), conical gear (5) and the gear teeth (6) engagement, the three forms a two driving wheel conical gear combining structure jointly.
7. a kind of down-hole electrodrill device and method that reduces the suffered moment of torsion of drill string according to claim 1, it is characterized in that: described bearing (16) is a thrust ball bearing, can be used for bearing the axial load on the vertical direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210052715.2A CN102536113B (en) | 2012-03-02 | 2012-03-02 | Underground electric drill device and method capable of reducing torque borne by drill stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210052715.2A CN102536113B (en) | 2012-03-02 | 2012-03-02 | Underground electric drill device and method capable of reducing torque borne by drill stem |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102536113A true CN102536113A (en) | 2012-07-04 |
| CN102536113B CN102536113B (en) | 2014-04-09 |
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| CN201210052715.2A Expired - Fee Related CN102536113B (en) | 2012-03-02 | 2012-03-02 | Underground electric drill device and method capable of reducing torque borne by drill stem |
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| CN103006289A (en) * | 2013-01-12 | 2013-04-03 | 青岛理工大学 | Axial force controllable surgical bone drill with abrasive grain bit |
| WO2016077976A1 (en) * | 2014-11-18 | 2016-05-26 | 史利利 | Household appliance and motor system |
| CN107140198A (en) * | 2017-06-21 | 2017-09-08 | 中电科芜湖钻石飞机制造有限公司 | Double coaxial tilting rotor wing unmanned aerial vehicle nacelle structures |
| CN107215458A (en) * | 2017-06-21 | 2017-09-29 | 中电科芜湖钻石飞机制造有限公司 | Electronic double coaxial tiltrotor aircrafts |
| CN108005602A (en) * | 2017-12-13 | 2018-05-08 | 攀枝花市朵实机械制造有限公司 | Preventing sticking drilling rod protects structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103006289A (en) * | 2013-01-12 | 2013-04-03 | 青岛理工大学 | Axial force controllable surgical bone drill with abrasive grain bit |
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| CN107140198A (en) * | 2017-06-21 | 2017-09-08 | 中电科芜湖钻石飞机制造有限公司 | Double coaxial tilting rotor wing unmanned aerial vehicle nacelle structures |
| CN107215458A (en) * | 2017-06-21 | 2017-09-29 | 中电科芜湖钻石飞机制造有限公司 | Electronic double coaxial tiltrotor aircrafts |
| CN107215458B (en) * | 2017-06-21 | 2023-12-08 | 中电科芜湖钻石飞机制造有限公司 | Electric double coaxial tilting rotor craft |
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| CN108005602A (en) * | 2017-12-13 | 2018-05-08 | 攀枝花市朵实机械制造有限公司 | Preventing sticking drilling rod protects structure |
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| Publication number | Publication date |
|---|---|
| CN102536113B (en) | 2014-04-09 |
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