CN108789260A - A kind of reamer and method for installing plate nut - Google Patents
A kind of reamer and method for installing plate nut Download PDFInfo
- Publication number
- CN108789260A CN108789260A CN201810541905.8A CN201810541905A CN108789260A CN 108789260 A CN108789260 A CN 108789260A CN 201810541905 A CN201810541905 A CN 201810541905A CN 108789260 A CN108789260 A CN 108789260A
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- China
- Prior art keywords
- plate nut
- level
- housing screw
- pedestal
- reamer
- Prior art date
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- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 33
- 238000009434 installation Methods 0.000 claims abstract description 32
- 238000003825 pressing Methods 0.000 claims description 25
- 238000010586 diagram Methods 0.000 description 10
- 238000007667 floating Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 241001454768 Mentzelia nuda Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The present invention provides a kind of reamer and method for installing plate nut, and the circular arc slot structure on pedestal is not weighed wounded, and can play anti-error installation when plate nut can be protected to install by pedestal.Reamer includes pedestal, and housing screw is vertically arranged on pedestal, and housing screw lower end is coaxially installed with top；Arc groove matched with plate nut and for placing plate nut is additionally provided on pedestal, the axial direction of arc groove is parallel with the axial direction of housing screw；It is top when use to be located at right over arc groove, to install plate nut.When use, plate nut is placed in arc groove, support ring in guider is placed on plate nut, the top reaming that the first stage is carried out to plate nut for being first 45 degree with angle is installed, and the top reaming that second stage is carried out to plate nut for being again then 60 degree with angle is installed.
Description
Technical field
The invention belongs to reamer technical field of tools, it is related to support ring and the peace of sector pop-up crab bolt in guider
Dress technology, more particularly to a kind of reamer and method for installing plate nut.
Background technology
Currently on the market, reamer be widely used it is general, in China extensive development aerospace, large scale equipment,
In iron, high ferro, tunnel, water conservancy and urban planning and construction, reamer technology is very promising application technology, and society
Economic benefit is extremely good.Support ring is one thin wall ring-shaped work pieces in guider, using pervious reamer mounting technology, peace
During filling plate nut, plate nut face is contacted with reamer chassis, and under top active force, chassis usually weighs supporting plate wounded
Nut causes plate nut to be scrapped, and plate nut is expensive, and cost is caused to increase；And the structure of existing reamer chassis
It is likely to result in the error of plate nut installation direction, every time when installation, it is necessary to which the installation direction for checking plate nut causes to install
Process is complicated.
Invention content
For problems of the prior art, the present invention provides a kind of reamer and side for installing plate nut
Method, the circular arc slot structure on pedestal, is not weighed wounded when plate nut can be protected to install by pedestal, and can play anti-error installation and make
With.
The present invention is to be achieved through the following technical solutions：
It is a kind of for installing the reamer of plate nut, including pedestal, housing screw is vertically arranged on pedestal, compresses spiral shell
Nail lower end is coaxially installed with top；It is additionally provided with matched with the first plate nut on pedestal and is used to place the first supporting plate spiral shell
Female arc groove, the axial direction of arc groove are parallel with the axial direction of housing screw；It is top when use to be located at right over arc groove, with installation
First plate nut.
Preferably, circular arc trench bottom is provided with gasket, is used to place the first plate nut on gasket.
Further, gasket is the gasket of tape relay circular arc.
Preferably, top connecting pin and tip including being connected, connecting pin are equipped with two level stepped hole, two level stepped hole
The level-one hole section and two level hole section being sequentially increased including diameter, level-one hole section are internal thread hole and separate tip；Housing screw
Lower end is two level multi-diameter shaft, including the level-one shaft part that is sequentially reduced of diameter and two level shaft part, primary axis section are located at housing screw
End and equipped with the external screw thread that coordinate with level-one hole section, less than the length of two level shaft part, level-one shaft part stretches for the length of level-one hole section
Enter in two level hole section.
Preferably, multiple arc grooves with the cooperation of the first plate nut are provided on pedestal, housing screw position can adjust
It is whole with corresponding respectively with multiple arc grooves.
Further, housing screw is mounted on the base by column, pressing plate and screw, and column is set on the base, and
It is provided with multiple longitudinal threaded bores at the top of column, threaded hole and strip hole are provided on pressing plate, screw passes through the strip of pressing plate
Pressing plate is mounted on the top of column by hole, and housing screw is threaded in by the threaded hole on pressing plate on pressing plate, and compresses spiral shell
Nail is positioned at the side of column.
Preferably, it is additionally provided with positioning pin on bottom plate, for disposing the second plate nut, when use is top to be located at positioning pin
The surface of positioning pin, to install the second plate nut.
Preferably, top is two, and an angle is 45 degree, another angle is 60 degree.
Preferably, clamping screw length is 110~120mm.
A method of installation plate nut is based on the reamer, plate nut is placed in arc groove, by guider
Interior support ring is placed on plate nut, and the top reaming that the first stage is carried out to plate nut for being first 45 degree with angle is installed,
Then the top reaming that second stage is carried out to plate nut for being again 60 degree with angle is installed.Compared with prior art, this hair
It is bright that there is technique effect beneficial below：
The reamer of the present invention, pedestal are equipped with the circular arc slot structure that matches with plate nut, by supporting plate spiral shell when installation
Mother is placed in circular arc slot structure, top under the action of housing screw, reaming installation is carried out to plate nut, due to plate nut
It is placed in the circular arc slot structure coordinated with its shape, plate nut can be weighed wounded to avoid pedestal when installation, to protect support
Crab bolt structural integrity reduces the scrappage of plate nut, cost-effective.Also, arc groove has similar with plate nut shape
As direction, anti-error installation can be played, plate nut is facilitated to install, ensure that the correctness of installation direction.Existing expansion
Hole device belongs to integral structure, and guider inside support ring can also damage hold-down bolt when installing plate nut, causes reamer whole
Structure is scrapped, can not normal use, cause cost to increase, inefficiency, and inconvenient to use influences part production efficiency, makes
At cannot deliver on time, it is low to reprocess rear reuse rate, and cost increases.And reamer belongs to split structure in the present invention, energy
Enough meet the quick-replaceable of spare part, ensures production efficiency.
Further, using gasket, hardness is suitably lower than plate nut hardness, and intensity has to height, prevents pedestal from damaging
Plate nut avoids re-replacing installation again, plays protection plate nut.In order to plate nut respective outer side edges, use
Gasket with inward flange connecting arc can preferably play a protective role.Gasket is mounted on chassis arc groove structural base, makes
With efficient and convenient, mobile control need not be artificially carried out, if damage can not interfere with plate nut installation with quick-replaceable
Progress.
Further, top to give full play to floating action, top and support under existing turret head housing screw effect
Concentricity is not effective to ensure that when crab bolt contacts, and is only taken mobile pallet nut that top position is coordinated to carry out reaming, is led
Cause carry out reaming that cannot be efficient, stable.And it is top as screw rotates movement, expanded using spinning mode
Hole, all directions unbalance stress, makes coating shedding, is not sufficient to ensure that reaming is circular state, influences normal use.And it is of the invention
In, set housing screw lower end to two level multi-diameter shaft, top linkage section is set as two level stepped hole, and level-one shaft part passes through level-one
Hole section is screwed into two level hole section, and two level shaft part is located in level-one hole section, since level-one shaft section diameter is less than two level hole section, two level axis
Section diameter be less than level-one hole section, to it is top the lower end of housing screw can free floating, in use, in the work of housing screw
Under, the top cooperation plate nut of floating automatically moves position, reaches exact contact cooperation, can reach efficient, stabilization
Reaming is installed.Also, it is top to be rotated with housing screw, therefore be that its axial manner carries out reaming, all directions stress
Equilibrium influences to reduce on coating, ensure that reaming is circular state, operating lifetime.The ingenious place of float design is
When top and plate nut contacts, reaming quality is improved, installation effect is good
Further, multiple arc grooves are set on pedestal, and strip hole is set on pressing plate, multiple screw threads are set on column
Pressing plate is fixed on column using screw by the threaded hole on strip hole and column by hole, to by replacing on column
Threaded hole can change the position of pressing plate, so as to change the position of housing screw, make housing screw and multiple arc grooves
Corresponding matching can be distinguished, therefore work as an arc groove when something goes wrong, can replace and be carried out using other arc grooves at any time
Installation, does not influence the normal use of reamer, reduces cost.
Further, the positioning pin on the bottom of bottom is for installing second of plate nut, to which reamer can not only be installed
Plate nut on guider inside support ring, it may also be used for the installation of the fan-shaped component pop-up crab bolt of blade positioning has widened it
Use scope.
Further, existing reamer, in reaming procedure, since chassis and turret head housing screw length are long, six
Angle head housing screw is prone to be bent, and is not easy to ensure that top position, positioning are unstable in rotary course.The present invention designs short stroke
Pedestal and housing screw structure, housing screw effect when have enough intensity and stronger rigidity, be not susceptible to bending become
Shape ensures top shift position, accurate positioning, portable construction.
Installation method of the present invention, plate nut is placed in arc groove, then is installed, and protection supporting plate spiral shell is can be very good
Mother is not damaged by pressure by pedestal.The method of existing installation plate nut, is the top primary completion reaming using 60 ° of angles, though efficiency
Height, but accidentally will appear problem off quality, plate nut stress is big, generates drag and becomes larger, occurs rapidly in the short time
Deformation, cracks, it cannot be guaranteed that reaming quality is met the requirements each time, coating shedding, shadow can occur for plate nut when serious
The reaming of plate nut is rung, cost is increased.Two stage reamings of top carry out of 45 ° and 60 ° angles are respectively adopted in the present invention, rise
Reaming transitional function reduces the damage to plate nut, ensure that reaming quality.
Description of the drawings
Fig. 1 is reamer topology view.
Fig. 2 is the first plate nut structural schematic diagram.
Fig. 3 is floor structure schematic diagram.
Fig. 4 is arc groove enlarged view, wherein (a) is stereogram, is (b) sectional view, is (c) front view, is (d) to bow
View.
Fig. 5 is gasket construction schematic diagram.
Fig. 6 is top tip structure schematic diagram, wherein (a) is stereogram, is (b) sectional view.
Fig. 7 is housing screw structural schematic diagram.
Fig. 8 is pillar construction schematic diagram.
Fig. 9 is pressure plate structure schematic diagram.
Figure 10 is bolt structure schematic diagram.
Figure 11 is the second plate nut structural schematic diagram.
Figure 12 is locating pin structure schematic diagram.
Figure 13 is the three-dimensional entity model figure installed in the work of the first plate nut.
In figure：1- pedestals；2- columns；3- pressing plates；4- screws；5- housing screws；6- is top；The second plate nuts of 7-；8-
Positioning pin；The first plate nuts of 9-；10- gaskets.
Specific implementation mode
With reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
The present invention considers that support ring, the structure of sector and plate nut in certain type part guider, innovative design are suitable
Close the reamer of support ring and sector installation plate nut in guider.
Referring to Fig. 1, the present invention is used to install the reamer of plate nut, including pedestal 1, and pressure is vertically arranged on pedestal 1
Tight screw 5,5 lower end of housing screw is coaxially installed with top 6；It is additionally provided with and multiple is matched with the first plate nut 9 on pedestal 1
And for placing the arc groove of the first plate nut 9, the axial direction of arc groove is parallel with the axial direction of housing screw 5；Arc groove bottom
Portion is provided with gasket 10, and gasket 10 is the gasket with inward flange connecting arc.Top 6 are located at right over arc groove when use, with
First plate nut 9 is mounted in guider in support ring.The structure of first plate nut as shown in Fig. 2, pedestal 1 structure
As shown in figure 3, the structure of arc groove is as shown in figure 4, the structure of gasket 10 is as shown in Figure 5.The first plate nut 9 is set when installation
On gasket 10 in arc groove, reaming installation is carried out to the first plate nut 9, it can be to avoid pedestal 1 to the first plate nut 9
Weigh wounded, reduce the first plate nut 9 scrappage, it is cost-effective.
As shown in Fig. 6 (a) and 6 (b), top 6 include the connecting pin and tip being connected, and connecting pin is equipped with two level ladder
Hole, two level stepped hole include the level-one hole section and two level hole section that diameter is sequentially increased, and level-one hole section is internal thread hole and separate point
End.As shown in fig. 7, the lower end of housing screw 5 is two level multi-diameter shaft, including the level-one shaft part that is sequentially reduced of diameter and two level axis
Section, primary axis section are located at the end of housing screw 5 and equipped with the external screw threads coordinated with level-one hole section, and the length of level-one hole section is less than
The length of two level shaft part, level-one shaft part stretch into two level hole section.Since level-one shaft section diameter is less than two level hole section, two level shaft part is straight
Diameter be less than level-one hole section, to top 6 the lower end of housing screw 5 can free floating, in use, in the work of housing screw 5
Under, the top 6 cooperation plate nut of floating automatically moves position, reaches exact contact cooperation, can reach efficient, stabilization
Reaming is installed.Also, when rotatably compressing screw 5, top 6 will not rotate with housing screw 5, therefore be that its axial manner carries out
Reaming, all directions stress equalization influence to reduce on the coating of plate nut, ensure that reaming is circular state, working life
Extend.
5 position of housing screw can be adjusted with corresponding respectively with multiple arc grooves, specifically as shown in Figure 1, housing screw 5
By column 2, pressing plate 3 and screw 4 be mounted on pedestal 1 on, column 2 be arranged on pedestal 1, and the top of column 2 be provided with it is more
A longitudinal threaded bore, threaded hole and strip hole are provided on pressing plate 3, and screw 4 passes through the strip hole of pressing plate 3 to be mounted on pressing plate 3
The top of column 2, housing screw 5 are threaded in by the threaded hole on pressing plate 3 on pressing plate 3, and housing screw 5 is located at column
2 side.The structure of column 2 as shown in figure 8, the structure of pressing plate 3 as shown in figure 9, the structure of screw 4 is as shown in Figure 10.To
When installing pressing plate 3 using the different threaded holes on column 2, the position of pressing plate 3 also can be different, so as to change housing screw
5 position allows housing screw 5 to distinguish corresponding matching with multiple arc grooves, therefore works as an arc groove when something goes wrong, can
It is installed using other arc grooves with replacing at any time, is not influenced the normal use of reamer, reduce cost.
Be additionally provided with positioning pin 8 on bottom plate 1, positioning pin 8 for placing the second plate nut 7, when use top 6 be located at it is fixed
Second plate nut 7 is mounted on blade and positioned on fan-shaped component by the surface of position pin 8.The structure of second plate nut 7 is such as
Shown in Figure 11, the structure of positioning pin 8 is as shown in figure 12.
Top 6 be two, and an angle is 45 degree, another angle is 60 degree；The top of 45 ° and 60 ° angles is respectively adopted
Point 6 carries out two stage reamings, plays reaming transitional function, reduces the damage to plate nut, ensures reaming quality.
5 length of clamping screw is 110~120mm, and the housing screw 5 of short stroke has enough intensity and relatively strong in effect
Rigidity, be not susceptible to flexural deformation, ensure that top 6 shift position, accurate positioning are further ensured that installation quality.
As shown in figure 13, use the method for reamer of the present invention installation plate nut for：Gasket 10 is positioned on pedestal 1
Arc-shaped grooves structure in, the first plate nut 9 is positioned over the top of gasket 10 and is installed, and by rotatably compressing screw 5, first adopts
First stage reaming is carried out with 45 ° top 6, drives top 6 vertical downward movement, and top 6 according to the position of the first plate nut 9
Self-adapting float is adjusted, until the first plate nut 9 of contact, top 6 is concentric with the first plate nut 9, is increased housing screw 5 and is turned round
Square carries out installation reaming, then applies reactive torque in housing screw 5, make top 6 and first plate nut 9 keep certain distance,
The installation for carrying out other first plate nuts 9 after first stage reaming, dismantles 45 ° top 6, is changed to 60 ° top 6, into
Row second stage reaming carries out reaming using the installation process principle of first stage；Second plate nut 7 is positioned over positioning pin 8
On installed, installation principle using the first plate nut 9 installation principle carry out, so that plate nut is mounted for " horn mouth "
State achievees the purpose that support ring and the installation of sector pop-up crab bolt in guider.
The present invention is in the arc groove of pedestal 1, shell tool 10 and the first plate nut 9 successively, in the work of housing screw 5
Under, floating it is top 6 cooperation the first plate nut 9 automatically move position, reach exact contact cooperation, can reach efficiently,
Stable installation reaming.The split type reamer install convenient of the present invention, realizes the quick-replaceable of reamer spare part, top 6 with
Plate nut contacts accurate positioning, and top 6 is floated well, and housing screw 5 is accurate mobile, meets plate nut installation specification,
Improve multifunctionality, stability, reliability and the high efficiency of reamer reaming.
Claims (10)
1. a kind of reamer for installing plate nut, which is characterized in that including pedestal (1), pedestal is vertically arranged on (1)
Housing screw (5), housing screw (5) lower end are coaxially installed with top (6)；It is additionally provided on pedestal (1) and the first plate nut
(9) arc groove matched and for placing the first plate nut (9), the axial direction of the axial direction and housing screw (5) of arc groove
It is parallel；(6) top when use are located at right over arc groove, to install the first plate nut (9).
2. the reamer according to claim 1 for installing plate nut, which is characterized in that circular arc trench bottom is provided with
Gasket (10), for placing the first plate nut (9) on gasket (10).
3. the reamer according to claim 2 for installing plate nut, which is characterized in that gasket (10) is tape relay
The gasket of circular arc.
4. the reamer according to claim 1 for installing plate nut, which is characterized in that top (6) include being connected
The connecting pin and tip connect, connecting pin are equipped with two level stepped hole, and two level stepped hole includes the level-one hole section that diameter is sequentially increased
With two level hole section, level-one hole section is internal thread hole and separate tip；The lower end of housing screw (5) is two level multi-diameter shaft, including straight
The level-one shaft part and two level shaft part that diameter is sequentially reduced, primary axis section are located at the end of housing screw (5) and are equipped with and level-one hole section
The external screw thread of cooperation, the length of level-one hole section are less than the length of two level shaft part, and level-one shaft part stretches into two level hole section.
5. the reamer according to claim 1 for installing plate nut, which is characterized in that pedestal is provided on (1)
Multiple arc grooves with the first plate nut (9) cooperation, housing screw (5) position can be adjusted with right respectively with multiple arc grooves
It answers.
6. the reamer according to claim 5 for installing plate nut, which is characterized in that housing screw (5) passes through
Column (2), pressing plate (3) and screw (4) are mounted on pedestal (1), and column (2) is arranged on pedestal (1), and the top of column (2)
Portion is provided with multiple longitudinal threaded bores, and threaded hole and strip hole are provided on pressing plate (3), and screw (4) passes through the strip of pressing plate (3)
Pressing plate (3) is mounted on the top of column (2) by hole, and housing screw (5) is threaded in pressing plate by the threaded hole on pressing plate (3)
(3) on, and housing screw (5) is located at the side of column (2).
7. the reamer according to claim 1 for installing plate nut, which is characterized in that bottom plate is also set up on (1)
Have a positioning pin (8), positioning pin (8) for disposing the second plate nut (7), when use top (6) be located at positioning pin (8) just on
Side, to install the second plate nut (7).
8. according to claim 1 for installing the reamer of plate nut, which is characterized in that top (6) are two, one
A angle is 45 degree, another angle is 60 degree.
9. the reamer according to claim 1 for installing plate nut, which is characterized in that clamping screw (5) length
For 110~120mm.
10. a kind of method of installation plate nut, which is characterized in that reamer described in claim 1 is based on, by plate nut
Be placed in arc groove, support ring in guider be placed on plate nut, first use angle be 45 degree it is top to plate nut into
The reaming of row first stage is installed, and the top reaming that second stage is carried out to plate nut for being again then 60 degree with angle is pacified
Dress.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810541905.8A CN108789260B (en) | 2018-05-30 | 2018-05-30 | Reamer and method for mounting support plate nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810541905.8A CN108789260B (en) | 2018-05-30 | 2018-05-30 | Reamer and method for mounting support plate nut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108789260A true CN108789260A (en) | 2018-11-13 |
| CN108789260B CN108789260B (en) | 2020-04-07 |
Family
ID=64089357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810541905.8A Active CN108789260B (en) | 2018-05-30 | 2018-05-30 | Reamer and method for mounting support plate nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108789260B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111975280A (en) * | 2020-08-28 | 2020-11-24 | 李东亮 | Be applied to welding jig of pipeline on condensate pump top cover |
| CN112246987A (en) * | 2020-09-29 | 2021-01-22 | 中国航发动力股份有限公司 | Self-adaptive positioning nut riveting tool and method |
| CN113858118A (en) * | 2020-06-30 | 2021-12-31 | 中国航发商用航空发动机有限责任公司 | Supporting plate nut mounting device and fastener feeding device |
| CN113941844A (en) * | 2020-07-15 | 2022-01-18 | 中国航发商用航空发动机有限责任公司 | Mounting and detecting tool |
| CN113953814A (en) * | 2020-07-21 | 2022-01-21 | 中国航发商用航空发动机有限责任公司 | Mounting tool and mounting method for supporting plate nut |
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| CN113752212B (en) * | 2020-06-03 | 2023-03-24 | 中国航发商用航空发动机有限责任公司 | Supporting plate nut mounting method and mounting tool thereof |
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| CN113941844B (en) * | 2020-07-15 | 2022-11-22 | 中国航发商用航空发动机有限责任公司 | Mounting and detecting tool |
| CN113953814A (en) * | 2020-07-21 | 2022-01-21 | 中国航发商用航空发动机有限责任公司 | Mounting tool and mounting method for supporting plate nut |
| CN111975280A (en) * | 2020-08-28 | 2020-11-24 | 李东亮 | Be applied to welding jig of pipeline on condensate pump top cover |
| CN112246987A (en) * | 2020-09-29 | 2021-01-22 | 中国航发动力股份有限公司 | Self-adaptive positioning nut riveting tool and method |
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|---|---|
| CN108789260B (en) | 2020-04-07 |
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