CN107225393B - Compressor auxiliary installation device - Google Patents
Compressor auxiliary installation device Download PDFInfo
- Publication number
- CN107225393B CN107225393B CN201710407182.8A CN201710407182A CN107225393B CN 107225393 B CN107225393 B CN 107225393B CN 201710407182 A CN201710407182 A CN 201710407182A CN 107225393 B CN107225393 B CN 107225393B
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- China
- Prior art keywords
- pull rod
- support ring
- auxiliary installation
- installation device
- pressure shaft
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P21/00—Machines for assembling a multiplicity of different parts to compose units, with or without preceding or subsequent working of such parts, e.g. with programme control
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of compressor auxiliary installation device, the compressor auxiliary installation device, the pull rods being arranged including support ring, in support ring along its axial activity.Support ring includes the bottom end for resting against phonic wheel and the top of support drawing mechanism, pull rod includes the first connecting pin and second connection end, compressor auxiliary installation device further includes measuring mechanism and the nut tightening device that is movably set in outside pull rod, and nut tightening device is used for the locking nut screwing on low-pressure shaft after the elongation of pull rod is qualified.Pull rod and nut tightening device can be axial movable with respect to support ring, and drawing mechanism presses support ring, while stretching to pull rod, and measuring mechanism measures its elongation.After the elongation of pull rod is qualified, nut is tightened by nut tightening device.Above-mentioned compressor auxiliary installation device, structure is simple, can easily tighten locking nut after the elongation needed for obtaining low-pressure shaft, it is ensured that turns assembly and meets design requirement, and is easy to operate.
Description
Technical field
The present invention relates to aero-engine flexible assembly fields, particularly, are related to a kind of compressor auxiliary installation device.
Background technique
When certain model engine low-pressure compressor component assembling, referring to Fig.1, phonic wheel 500 need to be set in low-pressure shaft 600
On, then locking nut 700 is tightened on low-pressure shaft 600.When tightening locking nut 700, design drawing requires locking screw
The amount of tension of the amount of the tightening pull rod of mother 700 is measured, and elongation need to reach 0.7~0.76mm.But scene has no measurement and stretches
Amount of tension can only be converted into corresponding torque by the special tooling of amount, when assembly, be tightened to locking nut 700, although
Guarantee assembling quality is connect, but does not meet design drawing requirement.Therefore it is badly in need of designing and processing a set of auxiliary locking nut installation
Tooling, to guarantee that assembly meets design drawing requirement.
Summary of the invention
The present invention provides a kind of compressor auxiliary installation devices, are not met with solving the assembly of locking nut and low-pressure shaft
The technical issues of design drawing requires.
The technical solution adopted by the invention is as follows:
A kind of compressor auxiliary installation device, the pull rod being arranged including support ring, in support ring along its axial activity.
Support ring includes for resting against the bottom end of phonic wheel and being used to support the top of drawing mechanism, and pull rod includes for connecting
First connecting pin of low-pressure shaft and the second connection end that low-pressure shaft is stretched for connecting drawing mechanism, compressor auxiliary installation
Device further includes measuring mechanism for measuring the elongation of pull rod and the nut tightening device being movably set in outside pull rod, spiral shell
Female device for screwing up is used for the locking nut screwing on low-pressure shaft after the elongation of pull rod is qualified.
Further, the first connecting pin is equipped with the internal screw thread cooperated with the external screw thread front of low-pressure shaft.The side wall of support ring
Offer operation port.Nut tightening device includes driving end and the handle for driving driving end to rotate, and driving end is set in drawing
Outside bar, bottom is equipped with the latch cooperated with the end tooth of locking nut.Handle is connected on driving end and is extended to by operation port
Outside support ring.
Further, the inner wall bottom end of support ring is equipped with the groove cooperated with the chimb of phonic wheel, and inner wall top is equipped with and drawing
Stretch the holding tank of mechanism cooperation.
Further, measuring mechanism includes the measurement for being fixedly arranged on the table folder seat of support ring outer wall and being set on table folder seat
Pin and measurement table, measurement pin and pull rod link, and are transferred to measurement table to measure the amount of tension of pull rod.
Further, table folder seat is fixed on the bottom of support ring outer wall by table folder screw.The center of measurement pin and table folder
Seat rotation connection, measurement pin one end pass through operation port and are overlapped on pull rod, and the other end is overlapped on the measuring staff of measurement table.
Further, measurement table is dial gauge, and table folder seat is equipped with the table folder set for fixing dial gauge.
Further, the bar diameter in the middle part of pull rod inside contracts the faying surface to form overlap joint measurement pin.
Further, symmetrical operation port there are two setting in support ring, measuring mechanism and handle correspond to different operation ports.
Further, driving end is circumferentially arranged with multiple jacks for handle insertion connection.
Further, drawing mechanism is hydraulic pump, and second connection end is equipped with the compression for compressing pull rod and hydraulic pump
Nut.
The invention has the following advantages: above-mentioned compressor auxiliary installation device, in use, first locking nut can be pacified
On low-pressure shaft, then support ring is rested on phonic wheel, pull rod is penetrated in support ring and be inserted in nut tightening device,
Pull rod both ends are connect with low-pressure shaft, drawing mechanism respectively again.Pull rod and nut tightening device can axially live with respect to support ring
Dynamic, drawing mechanism presses support ring, while stretching to pull rod, and measuring mechanism measures its elongation.When pull rod
After elongation is qualified, i.e. the elongation of low-pressure shaft is qualified, tightens nut by nut tightening device.Above-mentioned compressor auxiliary peace
Assembling device, structure is simple, can easily tighten locking nut after the elongation needed for obtaining low-pressure shaft, it is ensured that turn assembly
Meet design requirement, and easy to operate.
Other than objects, features and advantages described above, there are also other objects, features and advantages by the present invention.
Below with reference to figure, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of phonic wheel, low-pressure shaft and locking nut；
Fig. 2 is the schematic diagram of the section structure of the compressor auxiliary installation device of the preferred embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the compressor auxiliary installation device of the preferred embodiment of the present invention；
Fig. 4 is the using state structure diagram of the compressor auxiliary installation device of the preferred embodiment of the present invention；
Fig. 5 is the use state the schematic diagram of the section structure of the compressor auxiliary installation device of the preferred embodiment of the present invention；
Fig. 6 is the support ring the schematic diagram of the section structure of the preferred embodiment of the present invention；
Fig. 7 is the driving end the schematic diagram of the section structure of the preferred embodiment of the present invention；
Fig. 8 is the pull rod the schematic diagram of the section structure of the preferred embodiment of the present invention.
Description of symbols: 100, support ring；200, pull rod；300, nut tightening device；400, measuring mechanism；500,
Phonic wheel；600, low-pressure shaft；700, locking nut；800, drawing mechanism；
110, operation port；120, groove；130, holding tank；
210, faying surface；220, clamp nut；
310, driving end；320, handle；330, jack；340, latch；
410, table folder seat；420, measurement pin；430, table is measured；440, table folder screw.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Referring to Fig. 2~5, the preferred embodiment of the present invention provides a kind of compressor auxiliary installation device, including support ring
100, along the pull rod 200 of its axial activity setting in support ring 100.Support ring 100 includes the bottom for resting against phonic wheel 500
Hold and be used to support the top of drawing mechanism 800, pull rod 200 includes the first connecting pin for connecting low-pressure shaft 600 and is used for
Drawing mechanism 800 is connected to stretch the second connection end of low-pressure shaft 600, compressor auxiliary installation device further includes for measuring
The measuring mechanism 400 of the elongation of pull rod 200 and the nut tightening device 300 being movably set in outside pull rod 200, nut is tightened
Device 300 is used to tighten the locking nut 700 on low-pressure shaft 600 after the elongation of pull rod 200 is qualified.
Support ring 100 is tubular construction, and one end rests on phonic wheel 500, and the other end supports drawing mechanism 800.Pull rod 200
It is projecting axially into support ring 100, nut Auto-lock Machine structure is set on pull rod 200, i.e., nut Auto-lock Machine structure is arranged in support ring
Between 200 outer wall of 100 inner walls and pull rod.Nut Auto-lock Machine structure can slide axially with respect to support ring 100, pull rod 200.In use,
First locking nut 700 is mounted on low-pressure shaft 600, without tightening, and reserves the connection position of pull rod 200 Yu low-pressure shaft 600
It sets.As shown in Figure 1, support ring 100 is rested on phonic wheel 500, pull rod 200 is penetrated in support ring 100 and is inserted in nut and is twisted
Tight mechanism, then 200 both ends of pull rod are connect with low-pressure shaft 600, drawing mechanism 800 respectively.Drawing mechanism 800 presses support ring
100, while pull rod 200 is stretched, since pull rod 200 and nut Auto-lock Machine structure can be axial movable with respect to support ring 100,
Therefore obstruction will not be generated to 200 drawing process of pull rod.Initial position and stretching of the measuring mechanism 400 by record pull rod 200
Position afterwards obtains the elongation of pull rod 200.When the elongation of pull rod 200 reaches 0.7~0.76mm, can stop drawing
It stretches.And locking nut 700 is tightened by nut tightening device 300.
Since pull rod 200 is connect with low-pressure shaft 600, stretching pull rod 200 is to stretch low-pressure shaft 600, pull rod 200
Elongation is practical be low-pressure shaft 600 elongation.And low-pressure shaft 600 is thin-wall construction, and pull rod 200 can be considered in contrast
Rigid structure, the impetus of drawing mechanism 800 when can be used as measurement amount of tension.Drawing mechanism 800 is connect with pull rod 200, without
It is directly connected to low-pressure shaft 600, also can avoid low-pressure shaft 600 and deform.
The invention has the following advantages: above-mentioned compressor auxiliary installation device, in use, can be first by locking nut
700 are mounted on low-pressure shaft 600, then rest on support ring 100 on phonic wheel 500, and pull rod 200 is penetrated in support ring 100
And it is inserted in nut Auto-lock Machine structure, then 200 both ends of pull rod are connect with low-pressure shaft 600, drawing mechanism 800 respectively.200 He of pull rod
Nut Auto-lock Machine structure with respect to support ring 100 can axial activity, drawing mechanism 800 presses support ring 100, at the same to pull rod 200 into
Row stretches, and measuring mechanism 400 measures its elongation.When the elongation of pull rod 200 is qualified after, i.e. low-pressure shaft 600 is stretched
Long amount is qualified, tightens nut by nut Auto-lock Machine structure.Above-mentioned compressor auxiliary installation device, structure is simple, makes low-pressure shaft
Locking nut 700 can be easily tightened after elongation needed for 600 acquisitions, it is ensured that turned assembly and met design requirement, and operate
It is convenient.
Optionally, referring to Fig. 5, Fig. 8, the first connecting pin is equipped with the internal screw thread cooperated with the external screw thread front of low-pressure shaft 600.
The side wall of support ring 100 offers operation port 110.Nut Auto-lock Machine structure includes driving end 310 and for driving driving end 310
The handle 320 of rotation, driving end 310 are set in outside pull rod 200, and bottom is equipped with the latch cooperated with the end tooth of locking nut 700
340.Handle 320 is connected on driving end 310 and is extended to outside support ring 100 by operation port 110.
Low-pressure shaft 600 is equipped with external screw thread, and locking nut 700 is screwed in externally threaded rear portion, and the first connecting pin is equipped with interior spiral shell
Line is tightened in externally threaded front.It is connected through a screw thread, 200 stable connection of low-pressure shaft 600 and pull rod, and contact area
Greatly, 600 uniform force of low-pressure shaft, it is not easy to deform.
After the integral installation of compressor auxiliary installation device is good, before stretchable mechanism 800 stretches pull rod 200, it can carry out
Gap of the measuring mechanism 400 such as between the gap and threaded connection of dial gauge is eliminated in pre-stretching.Then by drawing mechanism 800
Tool pressure removal tensional state, by the pointer zero setting of such as dial gauge of measuring mechanism 400.Pressure stretches pull rod 200 again, until drawing
The elongation of bar 200 reaches requirement.This operation eliminates the errors that measuring mechanism 400 and threaded connection gap generate, thus survey
It is more accurate to measure result.
Further, since be arranged with phonic wheel 500 outside low-pressure shaft 600, thus be mounted directly the operating space of locking nut 700 compared with
It is small.Driving end 310 is equipped with latch 340, engages with the end tooth of 700 top surface of locking nut.Handle 320 is connected on driving end 310
And extended to outside support ring 100 by operation port 110,310 sets of driving end on pull rod 200, reach in the elongation of pull rod 200
To after target, locking nut 700 can be tightened by pulling driving end 310.When the design is so that tighten locking nut 700, behaviour
It is big to make space, and laborsaving.
Optionally, referring to Fig. 2,5 and 7, the inner wall bottom end of support ring 100 is equipped with the groove cooperated with the chimb of phonic wheel 500
120, inner wall top is equipped with the holding tank 130 cooperated with drawing mechanism 800.
The cooperation of the chimb of groove 120 and phonic wheel 500 may make support ring 100 is firm to be placed on phonic wheel 500, holding tank
130 design may make the firm support drawing mechanism 800 of support ring 100.
Optionally, referring to Fig. 2~5, measuring mechanism 400 includes being fixedly arranged on the table folder seat 410 of 100 outer wall of support ring and setting
The measurement pin 420 and measurement table 430 being placed on table folder seat 410, measurement pin 420 and pull rod 200 link, and are transferred to measurement table
430 to measure the amount of tension of pull rod 200.
Measurement pin 420 and pull rod 200 link.When pull rod 200 stretches, 420 corresponding sports of measurement pin, and movement is transmitted
To measurement table 430, triggering measurement table 430 measures the elongation of pull rod 200.When pull rod 200 stops stretching, measurement table 430 terminates
Measurement.Compare 430 initial measurement of measurement table and terminate measured value difference then can directly obtain or be computed after extended
Amount.
Optionally, referring to Fig. 2~5, table folder seat 410 is fixed on the bottom of 100 outer wall of support ring by table folder screw 440.
The center of measurement pin 420 and table folder seat 410 are rotatablely connected, and 420 one end of measurement pin passes through operation port 110 and is overlapped on pull rod 200
On, the other end is overlapped on the measuring staff of measurement table 430.
Measurement pin 420 is bascule, and 420 one end of measurement pin is overlapped on pull rod 200, and the other end is overlapped on measurement table
On 430 measuring staff.Measurement pin 420 close to 200 one end of pull rod rise how long distance, close to 430 one end of measurement table then decline how long
Distance.Thus measurement table 430 can directly measure the elongation of pull rod 200, operate more convenient.Table folder seat 410 passes through table folder spiral shell
Nail 440 is fixed, compressor auxiliary installation device when not in use, measuring mechanism 400 can be dismantled.
Optionally, referring to Fig. 2~5, measurement table 430 is dial gauge, and table folder seat 410 is equipped with the table for fixing dial gauge
Collet.By dial gauge come side elongation, as a result accurately, measurement is convenient.
Optionally, referring to Fig. 2,4,5 and 8, the bar diameter at 200 middle part of pull rod inside contracts the faying surface to form overlap joint measurement pin 420
210.Pull rod 200 may include two sections, and the bar diameter of one section of bottom is larger, and one section of bar diameter at top is smaller.Between two sections of pull rods 200
Faying face be faying surface 210.The pull rod 200 of the design has saved material.
Optionally, referring to Fig. 2~6, set that there are two symmetrical operation port 110, measuring mechanism 400 and hands in support ring 100
The corresponding different operation port 110 of handle 320.Measuring mechanism 400 and handle 320 are oppositely disposed, and the two distance farther out, can prevent
When pulling handle 320, measuring mechanism 400 is touched, measurement result is caused to be distorted.
Optionally, referring to Fig. 3,4 and 7, driving end 310 is circumferentially arranged with multiple jacks for the insertion connection of handle 320
330.Multiple jacks 330 are set, multiple jacks 330 are uniformly arranged in the circumferential direction, can be inserted into a jack 330 pull it is a bit of away from
The circumferential width changed another jack 330 from after, thus reduce operation port 110 requires smaller.Simultaneously to the peace of driving end 310
Holding position circumferential direction angle reduces, so that operation is more convenient.When the jack 330 of driving end 310 is less, assembly wrench head 310
When need rotating spanner head 310 to be directed at jack 330, it is cumbersome.
Optionally, referring to Fig. 2~5, drawing mechanism 800 is hydraulic pump, and second connection end is equipped with for by pull rod 200 and liquid
The clamp nut 220 that press pump compresses.The drawing force of hydraulic pump is larger, and pull rod 200 passes through clamp nut 220 after passing through hydraulic pump
Locking, in conjunction with firm.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of compressor auxiliary installation device, which is characterized in that including support ring (100), on the support ring (100) interior edge
The pull rod (200) of its axial activity setting；
The support ring (100) includes the bottom end of phonic wheel (500) and being used to support the top of drawing mechanism (800) for resting against,
The pull rod (200) include the first connecting pin for connecting low-pressure shaft (600) and for connect the drawing mechanism (800) with
The second connection end of the low-pressure shaft (600) is stretched, the low-pressure shaft (600) is thin-wall construction, so that the pull rod (200)
Elongation is practical be the low-pressure shaft (600) elongation, the compressor auxiliary installation device further includes described for measuring
The elongation of pull rod (200) is to obtain the measuring mechanism (400) of the elongation of the low-pressure shaft (600) and be movably set in described
The nut tightening device (300) of pull rod (200) outside, the nut tightening device (300) are used for stretching in the low-pressure shaft (600)
Locking nut (700) on the low-pressure shaft (600) is tightened after long amount is qualified；
The side wall of the support ring (100) offers operation port (110), and the measuring mechanism (400) includes being fixedly arranged on the branch
The table folder seat (410) of carrier ring (100) outer wall and the measurement pin (420) being set on the table folder seat (410) and measurement table
(430), the measurement pin (420) and the pull rod (200) are linked, and are transferred to the measurement table (430) to measure the drawing
The amount of tension of bar (200)；The center of the measurement pin (420) and the table folder seat (410) are rotatablely connected, the measurement pin
(420) one end passes through the operation port (110) and is overlapped on the pull rod (200), and the other end is overlapped on the measurement table (430)
Measuring staff on.
2. compressor auxiliary installation device according to claim 1, which is characterized in that first connecting pin is equipped with and institute
State the internal screw thread of the external screw thread front cooperation of low-pressure shaft (600)；The nut tightening device (300) include driving end (310) and
Handle (320) for driving driving end (310) to rotate, the driving end (310) are set in the pull rod (200) outside, bottom
Equipped with the latch (340) with the cooperation of the end tooth of the locking nut (700)；The handle (320) is connected to the driving end
(310) support ring (100) is extended to outside on and by the operation port (110).
3. compressor auxiliary installation device according to claim 2, which is characterized in that the inner wall of the support ring (100)
Bottom end is equipped with the groove (120) cooperated with the chimb of the phonic wheel (500), and inner wall top is equipped with to be cooperated with drawing mechanism (800)
Holding tank (130).
4. compressor auxiliary installation device according to claim 1, which is characterized in that the table folder seat (410) passes through table
Folder screw (440) is fixed on the bottom of the support ring (100) outer wall.
5. compressor auxiliary installation device according to claim 4, which is characterized in that the measurement table (430) is percentage
Table, the table folder seat (410) are equipped with the table folder set for fixing the dial gauge.
6. compressor auxiliary installation device according to claim 4, which is characterized in that the bar in the middle part of the pull rod (200)
Diameter inside contracts the faying surface (210) to be formed and overlap the measurement pin (420).
7. compressor auxiliary installation device according to claim 2, which is characterized in that the support ring (100) is equipped with
The corresponding different operation port (110) of two symmetrical operation ports (110), the measuring mechanism (400) and the handle (320).
8. compressor auxiliary installation device according to claim 2, which is characterized in that the driving end (310) is circumferentially
Equipped with multiple jacks (330) for the handle (320) insertion connection.
9. compressor auxiliary installation device according to claim 2, which is characterized in that the drawing mechanism (800) is liquid
Press pump, the second connection end are equipped with the clamp nut (220) for compressing the pull rod (200) and the hydraulic pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710407182.8A CN107225393B (en) | 2017-06-02 | 2017-06-02 | Compressor auxiliary installation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710407182.8A CN107225393B (en) | 2017-06-02 | 2017-06-02 | Compressor auxiliary installation device |
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| Publication Number | Publication Date |
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| CN107225393A CN107225393A (en) | 2017-10-03 |
| CN107225393B true CN107225393B (en) | 2019-07-26 |
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| CN201710407182.8A Active CN107225393B (en) | 2017-06-02 | 2017-06-02 | Compressor auxiliary installation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108000436A (en) * | 2017-12-01 | 2018-05-08 | 中国航发南方工业有限公司 | A kind of aero-engine high-torque nut assembling method |
| CN108044566B (en) * | 2018-01-12 | 2021-02-12 | 中国航发哈尔滨东安发动机有限公司 | Helicopter rotor shaft main bearing nut assembling method |
| CN112705939B (en) * | 2019-10-25 | 2022-01-28 | 中国航发商用航空发动机有限责任公司 | Mounting and dismounting tool and method for assembling aircraft engine assembly |
| CN114046203B (en) * | 2021-11-10 | 2022-12-09 | 中国航发南方工业有限公司 | Assembling method for rotor fulcrum of certain type turbofan engine |
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| DE4238922C2 (en) * | 1992-11-19 | 1996-08-08 | Gutehoffnungshuette Man | Method and device for tensioning and releasing tie rods in multi-part gas turbine rotors |
| DE102006033320B4 (en) * | 2006-07-17 | 2014-05-22 | Astrium Gmbh | Screw biasing means |
| CN200968840Y (en) * | 2006-11-08 | 2007-10-31 | 哈尔滨汽轮机厂有限责任公司 | Apparatus for measuring screw bolt elongation amount for steam turbine assembly measurement |
| CN201688812U (en) * | 2010-05-13 | 2010-12-29 | 上海东方泵业(集团)有限公司 | Tooling for measuring depth of groove in hole |
| CN102998182B (en) * | 2012-12-27 | 2017-10-10 | 哈尔滨东安发动机（集团）有限公司 | The installation measurement apparatus of aero-engine center pull rod |
| CN203337064U (en) * | 2013-05-27 | 2013-12-11 | 潍柴动力股份有限公司 | Air cylinder body spigot depth measurement tool and calibration device for calibrating same |
| CN103487322A (en) * | 2013-09-10 | 2014-01-01 | 广西桂冠开投电力有限责任公司 | Method and tool for measuring extension value of vertically-installed cold-drawn bolt with measurement hole |
| CN203738689U (en) * | 2014-03-24 | 2014-07-30 | 中国能源建设集团安徽电力建设第一工程公司 | Device used for measuring extension amount of bolt |
| CN105522537B (en) * | 2014-09-29 | 2017-05-17 | 中航商用航空发动机有限责任公司 | Nut placing and tightening device, method and system |
| CN204854547U (en) * | 2015-05-21 | 2015-12-09 | 广州市泓远自动化设备有限公司 | Bolt elongation measuring tool |
| CN205096828U (en) * | 2015-10-16 | 2016-03-23 | 中国南方航空工业(集团)有限公司 | Gas turbine rotor attachment bolt preloading device |
| CN106181878A (en) * | 2016-06-28 | 2016-12-07 | 中国南方航空工业(集团)有限公司 | Axial workpiece device for screwing up and method |
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