CN108916047A - A kind of two impeller shafts and associated gear of Anti-dislocation - Google Patents
A kind of two impeller shafts and associated gear of Anti-dislocation Download PDFInfo
- Publication number
- CN108916047A CN108916047A CN201811074807.4A CN201811074807A CN108916047A CN 108916047 A CN108916047 A CN 108916047A CN 201811074807 A CN201811074807 A CN 201811074807A CN 108916047 A CN108916047 A CN 108916047A
- Authority
- CN
- China
- Prior art keywords
- gear
- impeller
- prismatic
- bearing
- periphery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002184 metal Substances 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000009434 installation Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000013011 mating Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C29/0071—Couplings between rotors and input or output shafts acting by interengaging or mating parts, i.e. positive coupling of rotor and shaft
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/20—Rotors
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A kind of two impeller shafts and associated gear of Anti-dislocation, belong to blower components manufacturing technology field, it is equipped with and is constituted by two impeller shafts, gear, the center of gear sets prismatic through-hole, two impeller shafts include two columnar impellers and an impeller shaft, two impellers surround the impeller axial symmetry and fixed setting, the prismatic shoulder position of fixed gear is set in impeller shaft, the prismatic through-hole of gear is set on the prismatic shoulder position, can effectively prevent the generation of skidding misalignment between gear and impeller shaft.
Description
Technical field
The invention belongs to fan manufacturing technology fields, and in particular to two impeller shafts of roots blower and the manufacture of associated gear
Technical field.
Background technique
The gear of the roots blower of the prior art is set in one end of impeller shaft, uses rotary table between impeller shaft and gear
The mating setting of axis and axis hole of structure, is not provided with position and lock mechanism, the Position Scale that do not preapprove, in roots blower
Maintenance and installation during, need to adjust relative position between two two impeller shafts repeatedly using clearance gauge and corresponding adjust repeatedly
The relative position of whole driving gear and driven gear and impeller shaft, not only debugging step is complicated, but also adjustment difficulty is very big, past
Toward after needing to engage the technician of specialized factory to align accurately using specific purpose tool come installation and debugging repeatedly, then using to impeller
Axis and gear part hot-pressing technique could use after fastening, and user oneself installation is difficult to two impellers of roots blower
The recessed position of raised position and another two impeller is to just, leading to mounted roots blower two impeller in the process of running
Be easy with gear misplace, so that two impellers is collided, running resistance increase even can not normal use, it is timely to be unfavorable for user
Maintenance, resumes production rapidly, never has good solution to this defect.
Summary of the invention
The purpose of the present invention is overcome the deficiencies in the prior art, a kind of two impeller shafts and associated gear of Anti-dislocation, by two
Impeller shaft, gear are equipped with composition, which includes two columnar impellers and an impeller shaft, two impellers
Be axially parallel to the impeller shaft, two impellers are symmetrical around the impeller shaft and are fixedly installed, the end face of two impellers
Perpendicular to the impeller shaft, the angle between two geometric midlines of the end face of two impellers is 180 degree, which passes through
The center of circle of the end face of impeller and the axle center for intersecting at two impeller shafts, the center of gear set prismatic through-hole, one end of two impeller shafts
If bearing position, it is arranged bearing on bearing position, locking screw thread is successively arranged on the inside of bearing position and fixes prismatic of the gear
Shoulder position；The prismatic through-hole of gear is set on prismatic shoulder position, and nut is equipped on locking screw thread and lock gear；
The rib number of prismatic through-hole is identical as the rib number of prismatic shoulder position, is trigone or tetragonous or five ribs or six ribs or seven ribs or eight
Rib.
Preferably, the other end of impeller shaft sets cylindrical belt pulley shoulder position, belt pulley is set in belt pulley shoulder
On position, bearing position is set on the inside of belt pulley shoulder position, bearing is arranged bearing on position.
Preferably, the other end of wheel shaft sets bearing position, bearing is arranged bearing on position.
Preferably, the geometric center lines for corresponding to the end face of any impeller on the periphery of the side wall of the gear are turn 90 degrees partially
Position on, extend to the alignment mark line at the periphery edge equipped with a both ends, alignment mark line passes through the center of circle of periphery
And the axle center of impeller shaft is extended to, the wall surface of the periphery of the side wall of gear, alignment mark are carved or be compressed on to alignment mark line engraving
Line is recessed metal slot or protruding metal line.
Preferably, corresponding to the position of the geometric center lines of the end face of any impeller on the periphery of the side wall of the gear
On, the alignment mark line at the periphery edge is extended to equipped with a both ends, alignment mark line passes through the center of circle of periphery and extension
To the axle center of impeller shaft, the wall surface of the periphery of the side wall of gear is carved or be compressed on to alignment mark line engraving, and alignment mark line is recessed
Fall into metallic channel or protruding metal line.
Detailed description of the invention
Fig. 1 is a kind of assembling structure schematic diagram of two impeller shafts and associated gear quickly positioned.
The drawing reference numeral explanation of specific embodiment：
1. impeller, 2. impeller shafts, 3. gears, 4. prismatic through-holes, 5. prismatic shoulder positions, 6. locking screw threads, 7. geometry
Center line, 8. alignment mark lines.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing.In the description of the present invention,
It should be noted that the side of the instructions such as term " center ", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outside"
Position or positional relationship are to be based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description of the present invention and simplification of the description,
Rather than the device or element of indication or suggestion meaning must have a particular orientation, be constructed and operated in a specific orientation, because
This is not considered as limiting the invention.In addition, term " first ", " second ", " third " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Fig. 1 show a kind of two impeller shafts of Anti-dislocation and the assembling structure schematic diagram of associated gear, provided by the invention
A kind of two impeller shafts and associated gear of Anti-dislocation, are equipped with by two impeller shafts, gear and are constituted, and two impeller shafts include two circles
The impeller 1 of tubular and an impeller shaft 2, two impellers 1 are axially parallel to impeller shaft 2, and two impellers 1 surround impeller shaft 2
It is symmetrical and be fixedly installed, the end faces of two impellers 1 perpendicular to impeller shaft 2, two geometric midlines 7 of the end face of two impellers 1 it
Between angle be 180 degree, which passes through the center of circle of the end face of impeller 1 and intersects at the axle center of two impeller shafts 2, tooth
The center of wheel 3 sets prismatic through-hole 4, and one end of two impeller shafts sets bearing position, is arranged bearing on bearing position, the inside of bearing position according to
The secondary prismatic shoulder position 5 for being equipped with locking screw thread 6 and fixing the gear；The prismatic through-hole 4 of gear 3 is set in prismatic shoulder
On position 5, nut is equipped on locking screw thread 6 and lock gear 3；The rib number of prismatic through-hole 4 and prismatic shoulder position 5
Rib number is identical, is trigone or tetragonous or five ribs or six ribs or seven ribs or eight ribs.
In the present embodiment, the other end of two impeller shafts sets cylindrical belt pulley shoulder position, and belt pulley is set in belt
It takes turns on shoulder position, bearing position is set on the inside of belt pulley shoulder position, bearing is arranged on bearing position, two impeller shafts are constituted actively as a result,
Two impeller shafts constitute driving gear with the gear of the actively mating setting of two impeller shafts.
In the present embodiment, the other end of two impeller shaft sets bearing position, bearing is arranged on bearing position, as a result, two leaves
Wheel shaft constitutes driven two impeller shaft, constitutes driven gear with the gear of the driven mating setting of two impeller shafts.
It is quick and precisely right between driving gear and driven gear and active impeller axis and driven impeller axis in order to guarantee
Position corresponds to the deflection of geometric center lines 7 90 of the end face of any impeller in the present embodiment on the periphery of the side wall of driving gear
On the position of degree, the alignment mark line 8 at the periphery edge is extended to equipped with a both ends, which passes through periphery
The center of circle and carve or be compressed on gear 3 side wall periphery wall surface, alignment mark line 8 be recessed metal slot or protrusion gold
Belong to line；Correspondingly, the position of the geometric center lines 7 of the end face of any impeller is corresponded on the periphery of the side wall of driven gear
On, the alignment mark line 8 at the periphery edge is extended to equipped with a both ends, which passes through the center of circle of the periphery,
And the wall surface of the periphery of the side wall of gear 3 is carved or is compressed on, alignment mark line 8 is recessed metal slot or protruding metal line.
It is quick and precisely right between driving gear and driven gear and active impeller axis and driven impeller axis in order to guarantee
Position corresponds to the deflection of geometric center lines 7 90 of the end face of any impeller in the present embodiment on the periphery of the side wall of driven gear
On the position of degree, the alignment mark line 8 at the periphery edge is extended to equipped with a both ends, alignment mark line 8 passes through periphery
The wall surface of the periphery of the center of circle and be recessed engraving or the raised side wall for being compressed on gear；Correspondingly, the side wall of driving gear
It is corresponded on periphery on the position of geometric center lines 7 of the end face of any impeller, extends to the periphery edge equipped with a both ends
Alignment mark line 8, alignment mark line passes through the center of circle of periphery, and the outer of the side wall of gear is carved or be compressed on to alignment mark line engraving
The wall surface of disc, alignment mark line are recessed metal slot or protruding metal line.
The present invention is set in by designing two impeller shafts and associated gear of a kind of Anti-dislocation, the prismatic through-hole 4 of gear 3
On prismatic shoulder position 5, the firm stable for realizing gear 3 and two impeller shafts cooperates, can prevent gear 3 and two impeller shafts it
Between formed dislocation, be mounted on the roots blower of two impellers, can effectively prevent between gear and impeller shaft because vibration accumulation
Lead to the generation of skidding misalignment, the normal table work for the roots blower of two impeller shafts provides strong technology branch
It supports, the alignment mark line being arranged on driving gear and driven gear facilitates user can be by two in maintenance and installation roots blower
A two impeller and driving gear are rapidly and accurately aligned with driven gear, dramatically reduce enterprise to roots blower
Maintenance and installation difficulty, ensured the normal production of enterprise, environmental protection microorganism supply oxygen water pollution control, dust pollution
Pneumatic conveying field be with a wide range of applications, ensured the normal production of enterprise, there is technical characterstic outstanding and aobvious
The technological progress of work.
The above, better embodiment only of the present invention, but the scope of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art are in technical scope disclosed by the invention, and according to the technique and scheme of the present invention and its design is subject to
Equivalent substitution or change should be covered by the protection scope of the present invention.
Claims (5)
1. two impeller shafts and associated gear of a kind of Anti-dislocation, are equipped with by two impeller shafts, gear and are constituted, the two impeller shafts packet
Include two columnar impellers and an impeller shaft, two impellers are axially parallel to the impeller shaft, and two impellers surround the leaf
Wheel shaft is symmetrical and is fixedly installed, and the end faces of two impellers is perpendicular to the impeller shaft, and two of the end face of two impellers
Angle between geometric midline is 180 degree, which passes through the center of circle of the end face of impeller and intersect at two impeller shafts
Axle center, it is characterised in that：
The center of the gear sets prismatic through-hole, and one end of two impeller shaft sets bearing position, is arranged bearing on the bearing position, the axis
Hold the prismatic shoulder position for being successively arranged locking screw thread on the inside of position He fixing the gear；
The prismatic through-hole of the gear is set on the prismatic shoulder position, and a nut is equipped on the locking screw thread and locks
The fixed gear；
The rib number of the prismatic through-hole is identical as the rib number of the prismatic shoulder position, be trigone or tetragonous or five ribs or six ribs or
Seven ribs or eight ribs.
2. two impeller shafts and associated gear of a kind of Anti-dislocation according to claim 1, it is characterised in that：The impeller shaft it is another
Outer one end sets cylindrical belt pulley shoulder position, and belt pulley is set on the belt pulley shoulder position, the inside of the belt pulley shoulder position
If bearing position, bearing is arranged on the bearing position.
3. two impeller shafts and associated gear of a kind of Anti-dislocation according to claim 1, it is characterised in that：The impeller shaft it is another
Outer one end sets bearing position, is arranged bearing on the bearing position.
4. by a kind of two impeller shafts and associated gear of Anti-dislocation described in claims 1 or 2 or 3, it is characterised in that：The gear
Side wall periphery on correspond to any impeller end face the position that turn 90 degrees partially of geometric center lines on, be equipped with a both ends and extend
To the alignment mark line at the periphery edge, which passes through the center of circle of the periphery and carves or be compressed on gear
The wall surface of the periphery of side wall, alignment mark line are recessed metal slot or protruding metal line.
5. by a kind of two impeller shafts and associated gear of Anti-dislocation described in claims 1 or 2 or 3, it is characterised in that：The gear
Side wall periphery on correspond to any impeller end face geometric center lines position on, extend to the outer circle equipped with a both ends
The alignment mark line at face edge, the alignment mark line pass through the center of circle of the periphery and carve or be compressed on the outer of the side wall of gear
The wall surface of disc, alignment mark line are recessed metal slot or protruding metal line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811074807.4A CN108916047A (en) | 2018-09-14 | 2018-09-14 | A kind of two impeller shafts and associated gear of Anti-dislocation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811074807.4A CN108916047A (en) | 2018-09-14 | 2018-09-14 | A kind of two impeller shafts and associated gear of Anti-dislocation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108916047A true CN108916047A (en) | 2018-11-30 |
Family
ID=64409154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811074807.4A Pending CN108916047A (en) | 2018-09-14 | 2018-09-14 | A kind of two impeller shafts and associated gear of Anti-dislocation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108916047A (en) |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB219899A (en) * | 1923-07-04 | 1924-08-07 | Melvin Solomon Groh | Improvements in and relating to pumps |
| FR1150488A (en) * | 1956-05-07 | 1958-01-14 | Device for connecting the bodies of pumps, fans, blowers, hydraulic motors, turbines, compressors or other similar devices to fluid pipes and devices fitted with this device | |
| US4917583A (en) * | 1987-05-15 | 1990-04-17 | Leybold Aktiengesellschaft | Bearing support for a twin-shaft pump |
| JP2004353471A (en) * | 2003-05-27 | 2004-12-16 | Anest Iwata Corp | Rotating shaft having eccentric shaft part and scroll fluid machinery having the rotating shaft |
| CN1704600A (en) * | 2004-05-27 | 2005-12-07 | 乐金电子(天津)电器有限公司 | Gear type compressor |
| US20080193315A1 (en) * | 2007-02-08 | 2008-08-14 | Kabushiki Kaisha Toyota Jidoshokki | Roots-type fluid machine |
| CN201360507Y (en) * | 2009-02-17 | 2009-12-16 | 张百冬 | Cantilever-type hub roller device of poultry bone-meat separating machine |
| CN201794786U (en) * | 2010-09-26 | 2011-04-13 | 安徽晋煤中能化工股份有限公司 | Roots blower |
| CN103244427A (en) * | 2013-04-27 | 2013-08-14 | 西安航空动力控制科技有限公司 | Rotor positioning lock mechanism of roots vacuum pump |
| CN103696961A (en) * | 2013-12-30 | 2014-04-02 | 南京航空航天大学 | Birotor opposite rotating compressor |
| US20160032922A1 (en) * | 2014-07-31 | 2016-02-04 | Hamilton Sundstrand Corporation | Gear pump drive gear stationary bearing |
| CN205225732U (en) * | 2015-12-07 | 2016-05-11 | 天津市天鼓机械制造有限公司 | A combination formula seal structure for on roots's fan |
| CN205300392U (en) * | 2015-12-29 | 2016-06-08 | 武汉长江光电有限公司 | Multi -functional optical axis adjustment mechanism of gun sight |
| CN205533210U (en) * | 2016-04-11 | 2016-08-31 | 安徽科达埃尔压缩机有限公司 | Roots fan wheel back lash examination assistant device |
| CN106323135A (en) * | 2015-06-29 | 2017-01-11 | 宝钢不锈钢有限公司 | Roots impeller bearing online detection method and Roots blower suitable for method |
| CN107420306A (en) * | 2017-09-13 | 2017-12-01 | 荣易 | Three axle module dry vacuum pumps |
| CN207569015U (en) * | 2017-11-24 | 2018-07-03 | 内蒙古优利融盛新能源服务有限公司 | The torque identification means of disposable wind turbine fastening bolt and nut |
| CN212003576U (en) * | 2018-09-14 | 2020-11-24 | 安徽达来电机有限公司 | Dislocation-preventing two-impeller shaft and matched gear |
-
2018
- 2018-09-14 CN CN201811074807.4A patent/CN108916047A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB219899A (en) * | 1923-07-04 | 1924-08-07 | Melvin Solomon Groh | Improvements in and relating to pumps |
| FR1150488A (en) * | 1956-05-07 | 1958-01-14 | Device for connecting the bodies of pumps, fans, blowers, hydraulic motors, turbines, compressors or other similar devices to fluid pipes and devices fitted with this device | |
| US4917583A (en) * | 1987-05-15 | 1990-04-17 | Leybold Aktiengesellschaft | Bearing support for a twin-shaft pump |
| JP2004353471A (en) * | 2003-05-27 | 2004-12-16 | Anest Iwata Corp | Rotating shaft having eccentric shaft part and scroll fluid machinery having the rotating shaft |
| CN1704600A (en) * | 2004-05-27 | 2005-12-07 | 乐金电子(天津)电器有限公司 | Gear type compressor |
| US20080193315A1 (en) * | 2007-02-08 | 2008-08-14 | Kabushiki Kaisha Toyota Jidoshokki | Roots-type fluid machine |
| CN201360507Y (en) * | 2009-02-17 | 2009-12-16 | 张百冬 | Cantilever-type hub roller device of poultry bone-meat separating machine |
| CN201794786U (en) * | 2010-09-26 | 2011-04-13 | 安徽晋煤中能化工股份有限公司 | Roots blower |
| CN103244427A (en) * | 2013-04-27 | 2013-08-14 | 西安航空动力控制科技有限公司 | Rotor positioning lock mechanism of roots vacuum pump |
| CN103696961A (en) * | 2013-12-30 | 2014-04-02 | 南京航空航天大学 | Birotor opposite rotating compressor |
| US20160032922A1 (en) * | 2014-07-31 | 2016-02-04 | Hamilton Sundstrand Corporation | Gear pump drive gear stationary bearing |
| CN106323135A (en) * | 2015-06-29 | 2017-01-11 | 宝钢不锈钢有限公司 | Roots impeller bearing online detection method and Roots blower suitable for method |
| CN205225732U (en) * | 2015-12-07 | 2016-05-11 | 天津市天鼓机械制造有限公司 | A combination formula seal structure for on roots's fan |
| CN205300392U (en) * | 2015-12-29 | 2016-06-08 | 武汉长江光电有限公司 | Multi -functional optical axis adjustment mechanism of gun sight |
| CN205533210U (en) * | 2016-04-11 | 2016-08-31 | 安徽科达埃尔压缩机有限公司 | Roots fan wheel back lash examination assistant device |
| CN107420306A (en) * | 2017-09-13 | 2017-12-01 | 荣易 | Three axle module dry vacuum pumps |
| CN207569015U (en) * | 2017-11-24 | 2018-07-03 | 内蒙古优利融盛新能源服务有限公司 | The torque identification means of disposable wind turbine fastening bolt and nut |
| CN212003576U (en) * | 2018-09-14 | 2020-11-24 | 安徽达来电机有限公司 | Dislocation-preventing two-impeller shaft and matched gear |
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