CN105240508A - NBD planetary internal engagement four-split-flow pile machine speed reducer with oil temperature warning function - Google Patents
NBD planetary internal engagement four-split-flow pile machine speed reducer with oil temperature warning function Download PDFInfo
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- CN105240508A CN105240508A CN201510682961.XA CN201510682961A CN105240508A CN 105240508 A CN105240508 A CN 105240508A CN 201510682961 A CN201510682961 A CN 201510682961A CN 105240508 A CN105240508 A CN 105240508A
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 43
- 230000002146 bilateral effect Effects 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000005496 tempering Methods 0.000 abstract 1
- 238000009423 ventilation Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 239000000314 lubricant Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
- F16H57/0413—Controlled cooling or heating of lubricant; Temperature control therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/02—Gearboxes; Mounting gearing therein
- F16H57/027—Gearboxes; Mounting gearing therein characterised by means for venting gearboxes, e.g. air breathers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
- H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H1/00—Toothed gearings for conveying rotary motion
- F16H1/28—Toothed gearings for conveying rotary motion with gears having orbital motion
- F16H1/32—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear
- F16H2001/327—Toothed gearings for conveying rotary motion with gears having orbital motion in which the central axis of the gearing lies inside the periphery of an orbital gear with orbital gear sets comprising an internally toothed ring gear
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Power Engineering (AREA)
- General Details Of Gearings (AREA)
Abstract
The invention relates to the technical field of pile machine speed reduction, and discloses an NBD planetary internal engagement four-split-flow pile machine speed reducer with an oil temperature warning function. The pile machine speed reducer comprises a box, motors, a cover plate and an internal engagement four-split-flow transmission part. The pile machine speed reducer is characterized in that an oil temperature sensor is arranged in the box; a labyrinth-type ventilation hood is arranged on the cover plate; the pile machine speed reducer further comprises an outer cover, a labyrinth shell and an exhaust pipe; the two motors are connected to the lower portion of the box in an inverted manner, and the shaft extension ends of the motors are connected with NBD planetary speed reducers; the internal engagement four-split-flow transmission part comprises a driving wheel, symmetrical split-flow gears on the two sides and a center gear ring; mandrels of the split-flow gears are fixed to supporting plates, and the supporting plates are connected to cover plates of shells of the NBD planetary speed reducers; and the center gear ring is connected with a disc, the disc is connected with a main cylinder, the main cylinder is supported in an inner hole of the box through bearings, and the main cylinder is connected with a drill rod flange. The pile machine speed reducer has the beneficial effects that the dynamic state of the speed reducer can be mastered; the balance of air pressure inside and outside the box can be guaranteed; the inverted motors can reduce overturning moment of a pile machine and lower the probability of overturning accidents; the internal engagement four-split-flow manner can achieve high bearing force; and internal gear ring tempering is easier and costs less than carburization.
Description
[technical field]
The present invention relates to a machine braking technique field, a kind of oil temperature warning NBD planet internal messing four shunts stake machine speed reducer.
[background technique] is along with the fast development of China's economy, engineering machinery is widely used, based on build long spire stake machine spread all over the place, so that stake machine demand is anxious to be increased, and claims according to paper " Novel high torque stake mechanomotive force head hard-tooth surface speed reducer ": " whole nation even occurs holding the phenomenon of a large amount of payment for goods to the queuing delivery of cargo of stake machine host factory.Quantum of output is strengthened especially, so that the complete supply of material of Ge Zhuan machine host producer with the three-ring gear reducer producer of stake machine host factory supporting unit head." (seeing science and wealth, 2013.01)
Background technique: Patent Office of the People's Republic of China successively discloses following patent:
(1) screw pile machine power head (201020300223.7)
(2) Novel high torque stake mechanomotive force head hard-tooth surface speed reducer (201210558920.6)
(3) screw rod pile machine is with high pulling torque power head device (201420625553.1)
This paper is pointed out again: " but along with the quick growth of three-ring gear reducer amount, as the crucial transmission part of unit head, the problem points come out gets more and more, and this machine service cycle is long, and maintenance price is expensive.”
There is following problems in background technique:
A () working life is short, that damages first can not predict: 2013, Jiangsu speed reducer company damages stake machine speed reducer to be repaired four, subsequently, Lai Santai is drawn successively again during short tens days, open discovery: in casing, have foul everywhere, comprise metallic dust, mud powder, bearing wear, gear failure.The national conditions of China are, individual piling works team accounts for main flow, and most of owner's financial strength is not strong, can not the high speed reducer of stock's valency, they worry, and it is desirable to repair as soon as possible, be afraid of that engineering promise breaking loses order, they wish that designer can solve a difficult problem for machine speed reducer config failure early warning;
B the leakage of oil of () speed reducer output shaft sealing surface, main cause is vent hood: three during the last ten years, and China gear expert and manufacturing enterprise do not have the effect of the slight vent hood of attention one.(JB1130-70) that Qin great Tong " Modern mechanical design handbook " (first edition in 2011) rolls up the vent hood structure of 3.15-15 page and exhaust port size and " mechanical design handbook " (1980 editions, in, 817 pages) is just the same.The shortcoming of vent hood (JB1130-70) is: exhaust port too small (in case, maximum straight hole aperture is only Φ 20mm, and case aperture that is outer and environmental exposure is then less).Obvious especially for the shortcoming of stake machine speed reducer vent hood (JB1130-70): open work, dust is large, exhaust hole can be made after dust water breakthrough slowly to diminish, so that vent hood slowly loses casing internal and external pressure balance, when case internal air pressure is greater than air pressure outside case, lubricant oil just leaks from sealing;
(c) up-set type dual-motor shortcoming: because building site operating mode is severe, operator scarcely possesses maintenance of equipment and technical ability, and heavy motor and retarder are difficult to tear open, and thus keep in repair, maintain difficulty, motor tip cap is difficult to waterproof, more difficult dust-proof.Up-set type dual-motor center of gravity is high, and tilting moment is large, overthrow accident can occur.This is because: stake machine 23 meters of screw pile driver columns allow angles of inclination to only have 3 °, and working state ground allows ruling grade to only have 2 °, and ground, building site earth can pine, ground can not be very flat, therefore, stake machine overthrow accident does not occur unavoidably:
(1) outside Dongzhimen, 2006-04-26 Beijing, in building site, road one, Xianghe garden, a pile driver collapses suddenly, and accident causes two workman's death.Field Force claims: " estimation is that the soil below pile driver is too loose, and ground is uneven, so pile driver just can collapse.”
(2) 2006 years 09 month 07 day, mansion, YiShan Road,ShangHai No. 2010 Hechuans was in front of the door on building site, and a pile driver is tumbled suddenly, and why pile driver can tumble suddenly, and mainly too pine, pile driver crank cause soil property;
(3) 2013-03-07, there is security incident together building in building site in Baoxing crossing, the Near East, high official position road, Zhabei District, Shanghai one, a pile driver topples suddenly when constructing.
The technical characteristics of background technique (2) " Novel high torque stake mechanomotive force head hard-tooth surface speed reducer " (201210558920.6) is: (two) helical gear shaft engages with central gear, and the deficiency of this technology is now described by example ZZSH-630 type:
Central gear Z=67, m=16.0, b=256, output torque are 194362 × 2 (Nm)
Central gear external diameter Φ 1104, owing to only there being two shuntings, makes the weight 1920kg of central gear, nearly 40,000 yuan of price.
[summary of the invention]
The object of the invention is to provide a kind of: can give the alarm when oil temperature is increased to critical value; Improving vent hood makes air pressure balance Performance Ratio prior art vent hood (JB1130-70) more reliable; Changing overhead motor structure is upside-down structure, reduces a machine center of gravity, thus can reduce accident rate, and a kind of oil temperature warning NBD planet internal messing four shunts stake machine speed reducer.
[technological scheme]
Be provided with oil temperature sensor in casing, the eye of oil temperature sensor as people is fine, is very important parts, and oil temperature change in gear-box high for height is beamed back ground by sensor constantly, once oil temperature reaches transition point, technician has enough time arrangement to keep in repair;
Cover plate is provided with one or two mazy type vent hoods, comprise outer casing, labyrinth shell and outlet pipe, outlet pipe is connected in cover plate respective aperture, outlet pipe straight hole aperture 30 ~ 60mm, and the uniform small aperture of outlet pipe upper periphery is 10 ~ 15mm, labyrinth shell is fixing on the cover board, labyrinth valve jacket is outside outlet pipe, and have the toroidal cavity in order to exhaust therebetween, outer casing is connected with outlet pipe top, outer casing is enclosed within outside the shell of labyrinth, has the toroidal cavity in order to exhaust therebetween;
Two motors upside-down is connected to below casing, and shaft extension end of motor connects NBD planetary reducer, and NBD planetary reducer is placed in casing, motor about output center bilateral symmetry, NBD planetary reducer system double reduction;
Two motors upside-down is connected to below casing, and arranges about output center bilateral symmetry;
Described two motors axle stretch end connects NBD planetary reducer, and described NBD planetary reducer is placed in casing;
Internal messing four shunts driving component, comprises driving wheel, monosymmetric shunting gear and center gear ring, and the axle of shunting gear is fixing on the supporting plate, and dunnage is connected on the end face of the output terminal of NBD planetary reducer casing;
Center gear ring clutch disk, disk connects main cylinder, and main cylinder relies on first and second bearing to be bearing in casing center circle endoporus, has spacer ring between two bearings, main cylinder jointed rod flange, drilling rod Flange joint auger stem.
The background technique of [beneficial effect] ratio, its beneficial effect is:
(1) be provided with oil temperature sensor in casing, the operation state of speed reducer can be grasped at any time, the preparation of maintenance can be performed in advance;
(2) mazy type vent hood can effectively dust-proof, waterproof, effectively can ensure the balance of body inside and outside air pressure in case leak-stopping is oily;
(3) motor upside-down structure makes heavy motor and speed reducer easily overhaul, maintain, and is also beneficial to motor waterproof and dustproof;
(4) motor upside-down structure reduces the tilting moment of a machine, thus reduces overthrow accident probability.
(5) the present invention four shunts the flexural strength of modified ring gear, is about 1.5 times of the background technique " Novel high torque stake mechanomotive force head hard-tooth surface speed reducer " (201210558920.6) of two shunt structures;
[accompanying drawing explanation]
Fig. 1. the structural representation of the embodiment of the present invention
Fig. 2. the internal messing four of the embodiment of the present invention shunts the principle schematic of transmission
Fig. 3. the structural representation of embodiment of the present invention mazy type vent hood M
[embodiment]
Below in conjunction with accompanying drawing, the present invention is described in detail:
With reference to Fig. 1,2 and 3. a kind of oil temperature warning NBD planet internal messing four shunt stake machine speed reducer, comprise casing 1, two motors 3, cover plate 6 and the internal messing four be placed in casing 1 shunts driving component, it is characterized in that:
Be provided with oil temperature sensor G in described casing 1, oil temperature sensor G is fine as an eye, oil temperature change in the gear-box watching tens meters high attentively, and oil temperature is retarder run well very key factor, this is because: gear wear to timing oil temperature can start to raise; Bearing wear to one timing oil temperature can start to raise; When in casing, oil mass reduces, oil temperature can start to raise; Bearing wear illustrates that lubricant oil is dirty, is mixed into foul, comprises iron powder and mud powder in the dirty explanation lubricant oil of lubricant oil, and iron powder meaning gear starts wearing and tearing; Oil temperature raises makes oil viscosity reduce, oil is thinning, and greasy property is influenced;
Described cover plate 6 is provided with one or two symmetrically arranged mazy type vent hood M, comprise outer casing M1, labyrinth shell M2 and outlet pipe M3, outlet pipe M3 is connected in cover plate 6 respective aperture, outlet pipe M3 aperture 30 ~ 60mm, the uniform small aperture of outlet pipe M3 upper periphery is 10 ~ 15mm, described labyrinth shell M2 is fixed on cover plate 6, labyrinth shell M2 is enclosed within outside outlet pipe M3, therebetween exhaust toroidal cavity is had, described outer casing M1 is connected with outlet pipe M3 top, outer casing M1 is enclosed within outside the shell M2 of labyrinth, therebetween exhaust toroidal cavity is had, mazy type case can be dust-proof, rainwater leakage prevention is in case, strengthen straight apertures and the uniform small aperture of outlet pipe, make the existing vent hood of its air pressure balance Performance Ratio (JB1130-70) more reliable,
Described two motors 3 upside-down is connected to below casing 1, motor 3 axle stretch end connects NBD planetary reducer 2, NBD planetary reducer 2 is placed in casing 1, two motors 3 is symmetrical about output center, motor upside-down structure makes heavy motor and speed reducer easily overhaul, maintain, also be beneficial to motor waterproof and dustproof, motor upside-down structure reduces the tilting moment of a machine, reduces overthrow accident probability;
Described internal messing four shunts driving component, comprise driving wheel 9, shunting gear 8 and center ring gear 7, described driving wheel 9 is located on NBD planetary reducer 2 output shaft, shunt gear 8 bilateral symmetry for two that are meshed with driving wheel 9 to arrange, described shunting gear 8 engages with center gear ring 7, the axle of described shunting gear 8 is fixed in dunnage 13, dunnage 13 is connected on the end face of the output terminal of NBD planetary reducer 2 casing, obviously, four shunt structures are formed from driving wheel 9 to center ring gear 7, the bearing capacity that the background technique two of ratio is shunted can improve 30 ~ 40%, described center ring gear 7 is connected with disk 10, described disk 10 is integrally connected with main cylinder 4, described main cylinder 4 relies on first, two bearings 11, 12 are bearing in casing 1 center circle endoporus, described main cylinder 4 jointed rod flange 5, drilling rod flange 5 is used for connecting the drilling rod of stake machine.
Casing 1 inner chamber is used as oil storage pool, with oil pump, the lubricant oil of oil storage pool is carried out mandatory lubrication from casing 1 top to driving component engagement place after overanxious.
Above-described embodiment is to explanation of the present invention, is not limitation of the invention, anyly all belongs to protection scope of the present invention to the scheme after simple transformation of the present invention.
Claims (1)
1. an oil temperature warning NBD planet internal messing four shunts stake machine speed reducer, comprise casing (1), two motors (3), cover plate (6) and the internal messing four be placed in casing (1) and shunt driving component, it is characterized in that:
Oil temperature sensor (G) is provided with in described casing (1);
Described cover plate (6) is provided with one or two symmetrically arranged mazy type vent hoods (M), comprise outer casing (M1), labyrinth shell (M2) and outlet pipe (M3), outlet pipe (M3) is connected in cover plate (6) respective aperture, outlet pipe (M3) aperture 30 ~ 60mm, the uniform small aperture of outlet pipe (M3) upper periphery is 10 ~ 15mm, labyrinth shell (M2) is fixed on cover plate (6), labyrinth shell (M2) is enclosed within outside outlet pipe (M3), therebetween exhaust toroidal cavity is had, outer casing (M1) is connected with outlet pipe (M3) top, outer casing (M1) is enclosed within outside labyrinth shell (M2), therebetween exhaust toroidal cavity is had,
Described two motors (3) upside-down is connected to casing (1) below, motor (3) axle stretch end connects NBD planetary reducer (2), NBD planetary reducer (2) is placed in casing (1), and motor (3) is about output center bilateral symmetry;
Described internal messing four shunts driving component, comprise driving wheel (9), shunting gear (8) and center ring gear (7), described driving wheel (9) is located on NBD planetary reducer (2) output shaft, shunt gear (8) bilateral symmetry for two that are meshed with driving wheel (9) to arrange, shunting gear (8) is engaged with center ring gear (7), the axle of described shunting gear (8) is fixed in dunnage (13), and dunnage (13) is connected on the end face of the output terminal of NBD planetary reducer (2) casing;
Described center ring gear (7) is connected with disk (10), described disk (10) and main cylinder (4) are integrally connected, described main cylinder (4) relies on first and second bearing (11,12) to be bearing in casing (1) center circle endoporus, described main cylinder (4) jointed rod flange (5), drilling rod flange (5) is used for connecting the drilling rod of stake machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510682961.XA CN105240508A (en) | 2015-10-21 | 2015-10-21 | NBD planetary internal engagement four-split-flow pile machine speed reducer with oil temperature warning function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510682961.XA CN105240508A (en) | 2015-10-21 | 2015-10-21 | NBD planetary internal engagement four-split-flow pile machine speed reducer with oil temperature warning function |
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| Publication Number | Publication Date |
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| CN105240508A true CN105240508A (en) | 2016-01-13 |
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| CN201510682961.XA Pending CN105240508A (en) | 2015-10-21 | 2015-10-21 | NBD planetary internal engagement four-split-flow pile machine speed reducer with oil temperature warning function |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54105805A (en) * | 1978-02-07 | 1979-08-20 | Shimizu Construction Co Ltd | Method of noiseless and vibrationless presssin construction of steel pipe pile and steel pipe sheet pile and its device |
| CN101539115A (en) * | 2008-08-08 | 2009-09-23 | 吴小杰 | Megawatt multi-split wind power speed-increasing gearbox |
| JP2011122320A (en) * | 2009-12-09 | 2011-06-23 | Avolon Systmes Corp | Excavator |
| CN103670264A (en) * | 2013-11-28 | 2014-03-26 | 江苏泰来减速机有限公司 | Double-drive coaxial forward and reverse output spiral rock-entering drilling machine |
| CN104141453A (en) * | 2014-07-15 | 2014-11-12 | 江苏泰来减速机有限公司 | Dual-output and dual-steering rock-entering power head speed reducer |
| KR20150093411A (en) * | 2014-02-07 | 2015-08-18 | 명지대학교 산학협력단 | Wire reduction gear |
| CN104864076A (en) * | 2015-05-22 | 2015-08-26 | 陕西法士特齿轮有限责任公司 | Ventilation plug |
-
2015
- 2015-10-21 CN CN201510682961.XA patent/CN105240508A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54105805A (en) * | 1978-02-07 | 1979-08-20 | Shimizu Construction Co Ltd | Method of noiseless and vibrationless presssin construction of steel pipe pile and steel pipe sheet pile and its device |
| CN101539115A (en) * | 2008-08-08 | 2009-09-23 | 吴小杰 | Megawatt multi-split wind power speed-increasing gearbox |
| JP2011122320A (en) * | 2009-12-09 | 2011-06-23 | Avolon Systmes Corp | Excavator |
| CN103670264A (en) * | 2013-11-28 | 2014-03-26 | 江苏泰来减速机有限公司 | Double-drive coaxial forward and reverse output spiral rock-entering drilling machine |
| KR20150093411A (en) * | 2014-02-07 | 2015-08-18 | 명지대학교 산학협력단 | Wire reduction gear |
| CN104141453A (en) * | 2014-07-15 | 2014-11-12 | 江苏泰来减速机有限公司 | Dual-output and dual-steering rock-entering power head speed reducer |
| CN104864076A (en) * | 2015-05-22 | 2015-08-26 | 陕西法士特齿轮有限责任公司 | Ventilation plug |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20160113 |