CN2221673Y - Stepless variable-speed driving gear - Google Patents
Stepless variable-speed driving gear Download PDFInfo
- Publication number
- CN2221673Y CN2221673Y CN94225790U CN94225790U CN2221673Y CN 2221673 Y CN2221673 Y CN 2221673Y CN 94225790 U CN94225790 U CN 94225790U CN 94225790 U CN94225790 U CN 94225790U CN 2221673 Y CN2221673 Y CN 2221673Y
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- Prior art keywords
- output shaft
- change pulley
- hollow output
- speed
- stepless speed
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- Expired - Fee Related
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- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims description 60
- 230000005540 biological transmission Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 5
- 238000005461 lubrication Methods 0.000 claims description 4
- 210000000078 claw Anatomy 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 6
- 239000003208 petroleum Substances 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 18
- 239000003129 oil well Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 235000015927 pasta Nutrition 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 3
- 230000008093 supporting effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003967 crop rotation Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 210000001138 tear Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
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- 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)
- Transmissions By Endless Flexible Members (AREA)
Abstract
The utility model discloses a stepless variable-speed driving gear which is a device belonging to the field of mechanical industry. The utility model relates to the new-style ground driving gear of a deep-well screw pump device system mainly used for extracting petroleum. The stepless variable-speed driving gear is characterized in that the stepless variable-speed driving gear adopts triangular belt stepless speed regulation to solve stepless variable speed within the range required by starting torque and normal production rotary speed. The stepless variable-speed driving gear with a T-shaped configuration is composed of a motor direct connection speed variator, a speed reducer, an anti-reverse rotation brake, and a wellhead support bracket. The speed reducing part adopts a special oil leak preventing device, so the stepless variable-speed driving gear has the advantages of reliable operation, low integral installation height, high stability, compact structure, convenient installation, and wide application range.
Description
A kind of stepless speed changing driver is to belong to mechanical industry field, a kind of novel surface drive of the deep-well screw pump device systems that uses when being mainly used in recover petroleum.
Existing homemade screw pump surface drive is to drive belt crop rotation retarded motion by double-speed motor, drives screw pump work through a pair of umbrella gear deceleration rear driving polished rod.Belt transmission and umbrella gear transmission are fixed drive ratio.Device can only be realized two kinds of fixing output speeds by changing rotating speed of motor.This device starts the rotating speed height, and the rotation impulse inertia is big, and torque is less, the needs when the incompatibility screw pump starts, because screw pump is to start at full capacity, the detent torque that needs is big.If press torque screening device power required when on average turning round, will occur maybe can't starting because of the little startup difficulty of power.If when connecing the detent torque screening device, under the long-term production working order, again can the serious waste energy, can not provide a rational torque parameter for screw pump.In addition, the oil well that original device can not adapt to different situations effectively uses, and for a bite oil well in process of production along with the change of strata pressure again in continuous variation, adopt fixing rotating speed to come crude oil extraction not adapt to different oil wells by transferring ginseng, the needs of production of different mining period also makes subsurface progressive cavity be damaged easily.Reduce to when the required discharge capacity of pump can not be provided as the liquid supply rate when producing well, then can occur not having oil idle running in the pump, dry grinding damages the phenomenon of screw pump stator.
External (France) a kind of drive unit of producing, (seeing accompanying drawing 3) realized stepless change, but also defectiveness of its structure, the first it with the transmission of power of subsurface progressive cavity be by with the scyewed joint of polished rod, and the polished rod screw thread is in its end.This adds that with regard to the length that requires polished rod the length of the sucker rod that connects with rotor just equals design length, otherwise the mounting point that connects the back underwell pump can offset, have a strong impact on the proper functioning of pump, be difficult to accomplish that the sucker rod length of going into the well is just identical with design length in actual production construction again, this has just increased the difficulty of operation.Its two, this covering device setting height(from bottom) is big, stability is not good enough, not only difficultly installs but also be not easy to debugging management.
The purpose of this utility model mainly is to set out at the production of petroleum industry system is actual, solves the aforesaid drawbacks and a kind of stepless speed changing driver of designing.It can solve the stepless speed regulation of satisfying in detent torque and the ordinary production rotating speed claimed range.The optimal parameter of exportable slow-speed of revolution during startup, big torque can be adjusted the rotating speed of pump in process of production at any time according to the oil well situation, makes oil well production and apparatus all be in optimum Working; Adopt the T-shape structure in addition on the form structure of this covering device, fulcrum is arranged between two belt wheels, reduce the integral installation height, good stability makes compact structure, is convenient to installation administration.
The utility model is achieved in that it by motor direct connection " V " type vee belt, stepless speed variator, retarder, special-purpose browpiece, these several most of formations.At first, by the motor drives vee belt, stepless speed variator, carry out stepless speed regulation, its process is like this: change pulley changes the axial distance of two active change pulleys by the rotation speed-regulating hand wheel under the effect of spiral one leverage, driven change pulley is under the pressure spring effect, move axially in the other direction from action, thereby changed the radius of clean-up of vee belt in change pulley simultaneously, reach infinite variable speed purpose.Rotating speed from the variation of stepless speed variator output, make constant speed through hollow output shaft parallel gears retarder and increase square than slowing down, hollow output shaft form and form with gear-box from passing through out frame between stepless speed variator two change pulleys, finally the power transmitter by the output shaft upper end passes to rod string to output speed and moment of torsion, and driving subsurface progressive cavity rotor rotation with this, pump is started working.The sucker rod counter-rotating is threaded off when preventing to shut down, and has designed fat plugging device in the polished rod place of this device.Above-mentioned said special-purpose browpiece comprises polished rod sealer, flow tee and shelf etc.In addition, the hollow output shaft that this device adopts is to pass between stepless speed variator two belt wheels, and the polished rod that connects the down-hole rotor passes from hollow shaft inside, and the transmission of power of hollow shaft and polished rod is to realize by a dedicated fixed card.Existing same device surface structure is bigger, and well head is installed total height and reached more than 3 meters, and profile is " " type, is installed in the well head place, and the fulcrum secundly makes the device cantilever force, poor stability.Profile of the present utility model is designed to the T-shape structure, and fulcrum is arranged on the center of installing between two belt wheels, has changed the correlation of internal structure, has improved stressing conditions.The hollow shaft of this device passes through governor housing between two pairs of change pulleys, polished rod passes from hollow shaft inside, on hollow shaft, fasten with dedicated fixed, needn't use its end thread, the length of roofbolt of going into the well is not limited by screw position, fixed card all can conveniently be fixed in any position of polished rod, thereby has solved the problem of the difficult allotment of existing apparatus polished rod length.
The gear reducer part is prone to leakage of oil because output shaft is in the plumb position when oil sealing weares and teares or wears out, this usually is the common fault of upright military retarder.For solving this common fault, improve and designed the seal arrangement part.This device has increased an oil pump.First order gear adopts oil jet lubrication, thereby reduces the pasta line.Be provided with a flinger ring, output shaft is not directly contacted with lubricant oil, eliminated the possibility of leakage of oil.The fluctuation of pasta is provided with an oil sealing when considering running between flinger ring and second level gear, has stopped leakage of oil more reliably.And owing to reduce the pasta line, reduce and stir oily power loss, improved efficient, help the stable of oil quality, improve lubrication effect.
From as can be known above-mentioned, original driving unit on screw pump output speed is fixed bad adaptability.This device output speed is adjustable continuously, has enlarged application area, and adaptability is strong; Original device external form is " " type, and crank is tall and big again, inconvenient again installation administration, and this device profile is a T-shape, good stability, compact structure is reasonable, is convenient to installation administration, and can stop leakage of oil, and it is more reliable to turn round.
Below, do further narration in conjunction with the accompanying drawings:
Fig. 1 is a profile schematic representation of the present utility model, and Fig. 2 is this device main body cut-away section structural representation, and Fig. 3 is a kind of drive unit of France, and accompanying drawing is explained:
1, motor 2, polished rod 3, fixed card 4, bearing 5, driven change pulley 6, spring tray 7, spring 8, driven change pulley 9, one-level gear 10, oil pump 11, one-level gear 12, secondary gear 13, secondary gear 14, flinger ring 15, bearing 16, break 17, output shaft 18, oil sealing 19 bearings 20, adjusting nut 21, shift fork 22, screw mandrel 23, speed-regulating hand wheel 24, pinch roller box 25, active change pulley 26, vee belt 27, active change pulley 28, retarder 29, middle seat 30, browpiece 31, polished rod sealer 32, speed changer 33, flow tee.
As Fig. 1, this covering device is mainly by motor (1), and related speed changer (32) and retarder (28) are together with four most of compositions such as anti-reverse break (16) and browpiece (30).
Retarder (32) adopts V-type vee belt transmission, and it is installed in vee belt (26) and the handwheel (23) of speed regulating mechanism, adjusting nut (20) and fork (21) composition on the change pulley by active change pulley (27) and (25) driven change pulley (5) and (8).
Retarder (28) is the vertical hollow output shaft gear reducer of parallel axes, the inner helical gear that adopts slows down, its output shaft is hollow-core construction and the center of passing speed changer (32), relies on bearing (4), (19), (15) as supporting, and special bearing structure makes it to bear powerful axial force.The two-stage gear transmission is the Helical Cylindrical Gear gearing down.The reverse dropout phenomenon that torsional deflection causes when preventing to stop, the output shaft axle head is furnished with break (16).
Special-purpose browpiece (30) comprises polished rod sealer (31), flow tee general parts such as (33).
In addition, the polished rod (2) that connects the down-hole rotor passes from the hollow output shaft (17) of retarder, by dedicated fixed card (3) moment of torsion is passed to polished rod, drives down-hole rotor rotation, and pump work is realized deep-well oil-extraction.
With reference to Fig. 2, motor (1) uses Bolt Connection on the transmission housing side, spindle nose is by flat key and initiatively change pulley (27) connection of axially locating screw back-up ring, change pulley (25) utilizes feather key to move axially at the shaft extension position of active change pulley (27), but can not relatively rotate, the pinch roller box is equipped with bearing in (24), and the multidiameter shaft on bearing inner race and the active change pulley (25) closely cooperates.Shift fork (21) dewclaw contacts with pinch roller box (24) end face, and lower claw contacts with engaging groove on the adjusting nut (20), and the bearing pin of shift fork (21) is fixed on the frame.The same screw mandrel of speed-regulating hand wheel (23) (22) connects as one, and is to be connected movingly with shell two place's fulcrums.Driven speed change wheel shaft foundation two bearings supportings up and down is positioned at the gear box casing place, driven change pulley (5) internal diameter and driven change pulley (8) axle are Spielpassung, driven change pulley (5) is equipped with a pressure spring (7), spring (7) upper end contacts with spring tray (6), and spring tray (6) is fixed on the driven change pulley axle with snap ring.The driving gear of gear reducer (28) part passes through gear (9), (11), (12), (13) successively, export by hollow output shaft (17) again, be flat key between the shaft part that they are cooperated separately and connect, gear reducer (28) is assembled into one with hollow output shaft (17) and anti-reverse break (16) and stepless speed variator (32).Between speed changer (32) and the retarder (28), be connected by the inspection of flange spiral shell spiral shell between retarder (28) and the browpiece (10).Hollow output shaft (17) endoporus and polished rod (2) are Spielpassung; Hollow output shaft (17) is to pass between speed changer (32) two belt wheels; The polished rod (2) that connects the down-hole rotor passes from hollow output shaft (17) inside; There is an axially directed angle hollow output shaft (17) endoporus lower end, and its angle of deflection width optimum value is 1/3rd to 1/8th times of this hollow output shaft (17) diameter of bore; Hollow output shaft (17) top is formed to level Four ladder shaft part by one, and wherein the one-level diameter of axle in top is shaped as rectangular boss.Hollow output shaft (17) top is contained in the bearing (4) at gear box casing place together and the inner ring of (19) is a transition fit, hollow output shaft (17) below has one section to be to cooperate with bearing (15) inner ring, another section shaft shoulder is to connect with anti-reverse break (16) inner ring, and gear (13) is connected in ladder place, hollow output shaft (17) lower end.Carrier bearing (15) is contained in the middle seat (29), and anti-reverse break (16) shell is fixed by bolts to middle seat (29) below end face; The terminal multidiameter shaft of hollow output shaft (17) is connected cooperation with anti-reverse break (16) inner ring.Motor (1) is connected gear box casing one side position with bolt, motor (1) output shaft is connected with active change pulley (27), initiatively change pulley (27) is to do axially locating with positioning ring with upper shell motor shaft patchhole position, initiatively change pulley (25) endoporus is made Spielpassung with active change pulley (27) axis, the pinch roller box is equipped with a ball bearing in (24), bearing inner race closely cooperates with the multidiameter shaft of active change pulley (25), initiatively change pulley (25) axle contactless passing through from pinch roller box (24).Pinch roller box (24) end face contacts with shift fork (21) dewclaw, shift fork (21) lower claw contacts with the engaging groove of adjusting nut (20), the bearing pin of shift fork (21) is fixed on the shell place, and the same screw mandrel of speed-regulating hand wheel (23) (22) connects as one, and is to be connected movingly with shell two place's fulcrums.Speed changer (32) is positioned on the gear box casing by two bearings supportings about driven change pulley (8) foundation, driven change pulley (5) endoporus and driven change pulley (8) axle are Spielpassung, driven change pulley (5) is equipped with a pressure spring (7), and spring (7) upper end is fixed on the follower axle with snap ring with spring tray (6).The dedicated fixed card (3) that install on hollow output shaft (17) top is a regular prism body that is combined by separable symmetrical halves prism, and fixed card (3) center hole hole face has tooth, and prism lower end edge center line is furnished with a rectangular recess; Retarder (28) is provided with a centrifugal military oil pump (10), oil jet lubrication is adopted in gear transmission, between second level gear (13) and the flinger ring (14) oil sealing (18) is set, and output shaft (17) is not directly contacted with lubricant oil, eliminate the possibility of leakage of oil, improved the working life of this device greatly.
By Fig. 1, Fig. 2 as can be known, the infinite variable speed process of the utility model is like this: motor (1) drives initiatively change pulley (27) and (25) rotation, rely on the frictional force between vee belt and cone pulley to give driven change pulley (5) and (8) with transmission of power, drive driven change pulley and export a torque, during speed governing, rotate speed-regulating hand wheel (23), move by speed governing nut (20), driving shift fork (21) rotates, changed and be applied to the initiatively axial force of change pulley (25), forcing initiatively, the distance of the groove width between the change pulley (25) and (27) changes, changed the initiatively working diameter of change pulley, then changed the contact radius of vee belt on belt wheel, because the variation of position on driving wheel, vee belt then changes the active force between vee belt and driven change pulley (5) and (8).This active force overcomes the deformation power of spring (7), makes the vee belt carry out work on the driven change pulley diameter that has changed.Because initiatively the working diameter of change pulley is increasing or reducing, the working diameter of driven change pulley then correspondingly reduces or increases; Because of the displacement in the axial direction of driving and driven change pulley is continuous, it also is continuous that the groove width of two change pulleys changes again, so the rotating speed of output also is continuously adjustable.The rotating speed of stepless speed variator (32) output passes through parallel axes vertical gear retarder (28) again and slows down, thus perfect this stepless speed changing driver.
Claims (12)
1, a kind of stepless speed changing driver, it is made up of together with anti-reverse break (16) and several major parts of browpiece (30) related speed changer of motor (1) (32) and retarder (28), it is characterized in that speed changer (32) is kind of the stepless speed variator of " V " type vee belt, it is by active change pulley (27) and (25), driven change pulley (5) and (8), be installed in vee belt (26) and speed-regulating hand wheel (23) on the change pulley, adjusting nut (20) and fork (21) are formed, retarder (28) is the vertical hollow output shaft gear reducer of parallel axes, the inner two-stage helical gear that adopts slows down, pass through gear (9) successively, (11), (12), (13), export by hollow output shaft (17) again, retarder (28) and hollow output shaft (17) and anti-reverse break (16), speed changer (32) is assembled into one, between speed changer (32) and the retarder (28), be connected by flange bolt between retarder (28) and the browpiece (30).
2, by the described a kind of stepless speed changing driver of claim 1, it is characterized in that hollow output shaft (17) is to pass between speed changer (32) two belt wheels, the polished rod (2) that connects the down-hole rotor passes from hollow output shaft (17) inside.
3, by the described a kind of stepless speed changing driver of claim 1, it is characterized in that motor (1) is connected speed changer (32) housing one side with bolt, motor (1) output shaft is connected with active change pulley (27), initiatively change pulley (27) is to do axially locating with positioning ring with upper shell motor shaft patchhole position, initiatively change pulley (25) endoporus is made Spielpassung with active change pulley (27) axis, the pinch roller box is equipped with bearing in (24), bearing inner race cooperates with the multidiameter shaft of active change pulley, initiatively change pulley (25) axle contactless passing through from pinch roller box (24).
4, by the described a kind of stepless speed changing driver of claim 1, it is characterized in that fork (21) dewclaw contacts with pinch roller box (24) end face, fork (21) lower claw contacts with the engaging groove of adjusting nut (20), the bearing pin of fork (21) is fixed on the frame place, the same screw mandrel of speed-regulating hand wheel (23) (10) connects as one, and is to be connected movingly with shell two place's fulcrums.
5, by the described a kind of stepless speed changing driver of claim 1, it is characterized in that speed changer (32) is positioned on the gear box casing according to upper and lower two bearings by driven change pulley (8), driven change pulley (5) internal orifice dimension and driven change pulley (8) axle are Spielpassung, driven change pulley (5) is equipped with a pressure spring (7), spring (7) upper end contacts with spring tray (6), and spring tray (6) is fixed on the driven change pulley axle with snap ring.
6, by the described a kind of stepless speed changing driver of claim 1, it is characterized in that being flat key between driving gear (9), (11), (12), (13) of retarder (28) and shaft part that they are cooperated separately is connected, hollow output shaft (17) endoporus and polished rod (2) are Spielpassung, and there is an axially directed angle hollow output shaft (17) endoporus lower end.
7,, it is characterized in that chamfer width optimum value under hollow output shaft (17) endoporus is 1/3rd to 1/8th times of hollow output shaft (17) diameter of bore by claim 1 or the described a kind of stepless speed changing driver of claim 6.
8, by the described a kind of stepless speed changing driver of claim 6, it is characterized in that retarder (28) is provided with centrifugal oil pump (10), oil jet lubrication is adopted in gear transmission, between second level gear (13) and the impingement ring (14) oil sealing (18) is set.
9, by the described a kind of stepless speed changing driver of claim 1, it is characterized in that forming by 1 to 4 grade of ladder shaft part above the hollow output shaft (17), wherein the one-level diameter of axle in top is shaped as rectangular boss.
10, by the described a kind of stepless speed changing driver of claim 9, it is characterized in that hollow output shaft (17) top is contained in the bearing (4) of case of transmission together and the inner ring of (17) is a transition fit, hollow output shaft (17) below has one section to be to cooperate with carrier bearing (15) inner ring, and another section shaft shoulder connects with anti-reverse break (16) inner ring.
11, by the described a kind of stepless speed changing driver of claim 10, it is characterized in that gear (13) is connected ladder place, hollow output shaft (17) lower end, carry in the casing that bearing (15) is contained in middle seat (29), anti-reverse break (16) shell is fixed by bolts on the end face of middle seat (29) below.
12, by the described a kind of stepless speed changing driver of claim 11, it is characterized in that the regular prism body that the fixed card (3) that installs on hollow output shaft (17) top is made up of separable symmetrical halves prism, on the face of fixed card (3) center hole hole tooth is arranged, the prism lower end surface is furnished with a rectangular recess along center line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94225790U CN2221673Y (en) | 1994-02-18 | 1994-02-18 | Stepless variable-speed driving gear |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94225790U CN2221673Y (en) | 1994-02-18 | 1994-02-18 | Stepless variable-speed driving gear |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2221673Y true CN2221673Y (en) | 1996-03-06 |
Family
ID=33838912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94225790U Expired - Fee Related CN2221673Y (en) | 1994-02-18 | 1994-02-18 | Stepless variable-speed driving gear |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2221673Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107787674A (en) * | 2016-08-30 | 2018-03-13 | 勇猛机械股份有限公司 | A kind of manual regulating device of the high low velocity of change pulley |
| CN112007574A (en) * | 2020-08-09 | 2020-12-01 | 南京城市地下空间工程研究院有限公司 | Shield constructs foam additive preparation facilities suitable for hard stratum under soft |
| CN113813813A (en) * | 2021-10-12 | 2021-12-21 | 千月环保技术(北京)有限公司 | Stirring device for water flow gravitational potential energy conversion application |
-
1994
- 1994-02-18 CN CN94225790U patent/CN2221673Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107787674A (en) * | 2016-08-30 | 2018-03-13 | 勇猛机械股份有限公司 | A kind of manual regulating device of the high low velocity of change pulley |
| CN112007574A (en) * | 2020-08-09 | 2020-12-01 | 南京城市地下空间工程研究院有限公司 | Shield constructs foam additive preparation facilities suitable for hard stratum under soft |
| CN112007574B (en) * | 2020-08-09 | 2024-09-13 | 南京城市地下空间工程研究院有限公司 | Shield foam additive preparation device suitable for upper soft and lower hard stratum |
| CN113813813A (en) * | 2021-10-12 | 2021-12-21 | 千月环保技术(北京)有限公司 | Stirring device for water flow gravitational potential energy conversion application |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |