CN106734651B - A kind of closing method of flow regulator bridge pipe - Google Patents
A kind of closing method of flow regulator bridge pipe Download PDFInfo
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- CN106734651B CN106734651B CN201611118685.5A CN201611118685A CN106734651B CN 106734651 B CN106734651 B CN 106734651B CN 201611118685 A CN201611118685 A CN 201611118685A CN 106734651 B CN106734651 B CN 106734651B
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- outer circle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/84—Making other particular articles other parts for engines, e.g. connecting-rods
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- Mechanical Engineering (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a kind of closing method of flow regulator bridge pipe, this method forms flow regulator component by carrying out bridge pipe at corresponding annular groove to close up, and steps are as follows for specific method: (1) selecting equipment screw-rolling machine；(2) manufacture and design idler wheel；(3) idler wheel is installed；(4) Assembly part；(5) pressure of thread rolling machine is adjusted；(6) it closes up.Structure size of the present invention according to flow regulator component, in conjunction with the parameter designing idler wheel of screw-rolling machine；On screw-rolling machine, using continuous, spinning mode, spinning force is symmetrical, circumferentially continuous；It completes to close up on screw-rolling machine, close up high-quality, bottling technique is stablized, and it is easy to operate, solve the part closing in problem of small inner cavity and different holes, it can be in technical field of mechanical processing wide popularization and application.
Description
Technical field
The invention belongs to machinery manufacturing technology fields, are specifically related to a kind of closing method of flow regulator bridge pipe.
Background technique
It is certain type aero-engine flow regulator component as shown in Figure 1 and Figure 2.Component considers 2 and bridge pipe by shell 1, oil
3 compositions, 1 material of shell are steel, and the material of oily filter 2 and bridge pipe 3 is aluminium alloy；The wall thickness of bridge pipe 3 is δ, and δ value is smaller；Bridge
Adapter tube 3 by deformation of closing up, be securely stuck in shell 1, oily filter 34 outer grooves in, become shell 1, oily filter 2 and bridge pipe 3
At component；Development initial stage is filled the span of a man's arms using traditional two halves mold and carries out the closing in of bridge pipe 3, during actually closing up, bridge joint
Pipe 3 is split in land area by card wound, card.By analysis, the reason is that the radius of curvature at mold closing in is less than the song of 3 outer circle of bridge pipe
Rate radius, when closing in starts, the two sides of mold are first contacted with the outer circle of bridge pipe 3, and middle part is not contacted with bridge pipe 3, are closed up
Mold is in point contact to be formed with component, and in addition at mold clamping, closing in type face is mutually passed through with die joint, cutting edge is formed, so bridge
Adapter tube is split by card wound, card；Mold if the outside diameter design of bridge pipe before die face closes up by bridge pipe, at closing in
Radius of curvature be greater than bridge pipe and close up radius of curvature after molding, when closing in, bridge pipe cannot be with the outer groove of shell, oily filter
Face paste is closed, and closing in is not able to satisfy design drawing requirement.Therefore two-half die bottling technique is unable to appropriate flow rate adjuster bridge pipe
Molding.
It closes up for bridge pipe, is utilized in the closing method of rotary press modelling on lathe at present.When closing up, flow is clamped
The shell ends outer circle of governor assembly is stretched out outside lathe spindle at closing in, and in installing idler wheel on knife rest, lathe spindle drives stream
Governor assembly rotation is measured, knife rest moves radially, and pair of rollers casing implements spinning；Since flow regulator component is in cantilever-shaped
State, lathe closes up, and molding is poor, and especially oily filter outer groove is long Thin-walled Aluminum far from main shaft retaining part, arm length, and bridge pipe
Alloy components, poor rigidity, when closing up in oily filter 2, bridge pipe intensity cannot overcome closing in radial force and deform, or even fracture, therefore
Lathe closing in is also not suitable for the closing in of flow regulator bridge pipe.
Summary of the invention
To solve the above problems, the object of the present invention is to provide a kind of closing method of flow regulator bridge pipe, the party
Method uses symmetrical, continuous spinning mode, completes to close up on screw-rolling machine, close up high-quality, and bottling technique is stablized, operation letter
It is single, to solve the part closing in problem of small inner cavity and blind hole.
The present invention is achieved by following technical solution.
A kind of closing method of flow regulator bridge pipe, steps are as follows for specific method:
(1) it selects equipment screw-rolling machine: determining the flat key size on the screw-rolling machine diameter of axle and rolled thread arbor；
(2) manufacture and design idler wheel: idler wheel is designed as the rotary structure that one group of diameter does not wait, and the idler wheel end face on idler wheel is
Axial datum level, idler wheel outer circle are the radial reference face of idler wheel, are arranged in the idler wheel to match with the screw-rolling machine diameter of axle on idler wheel
Hole, and keyway is provided among idler wheel；
(3) idler wheel is installed: two idler wheels being mounted on screw-rolling machine main shaft, the axial position of idler wheel is adjusted, make two idler wheels
Idler wheel end face it is in the same plane, choose cushion block, and cushion block be installed on the work top of screw-rolling machine；
(4) Assembly part: by the shell of flow regulator component and oily filter assembly in bridge joint pipe orifice；
(5) adjust pressure of thread rolling machine: pressure of thread rolling machine chooses 1.5MPa ± 0.1MPa；
(6) close up: starting screw-rolling machine, two main shaft of screw-rolling machine drive the rotation of idler wheel main shaft, the part assembled are placed in pad
Among block and two idler wheels, it is bonded oily filter end face with the idler wheel end face on idler wheel, idler wheel makees radial feed, what pair of rollers assembled
The symmetrical radial compression of part, continuous spinning, to cylindrical die roll radial feed to spacing place, after part rotation 2 is enclosed, idler wheel retracts original
The closing in of flow regulator bridge pipe is completed in position.
Roller material in the step (2) is 45# steel, is heat-treated HRC35 ∽ 40.
The cooperation of roller inner holes and the screw-rolling machine diameter of axle uses H7/h6 in the step (2).
Idler wheel end face left end, which is located in idler wheel outer circle, is respectively arranged with raised outer circle A, raised outer circle B, raised outer circle
C, raised outer circle D.
The right end of the left hand projection outer circle A of the idler wheel end face is right-angle surface, the fillet surface that left end is 45 °.
The protrusion both ends outer circle B are 45 ° of chamferings.
The protrusion both ends outer circle C are 45 ° of chamferings.
The left end of the protrusion outer circle D is right-angle surface, the fillet surface that right end is 45 °.
The right-angle surface of the protrusion outer circle D is provided with left end outer circle, and left end outer circle matches with the left side outer circle on shell.
The shape surface of revolution of the idler wheel is 0.03mm to the concentricity tolerance of roller inner holes, and end face is to the surface of revolution and to rolling
The run-out tolerance for taking turns inner hole is 0.05mm.
The beneficial effects of the present invention are:
Structure size of the present invention according to flow regulator component, in conjunction with the parameter designing idler wheel of screw-rolling machine；In screw-rolling machine
On, using continuous, spinning mode, spinning force is symmetrical, circumferentially continuous；It completes to close up on screw-rolling machine, close up high-quality, closing in work
Skill is stablized, easy to operate, solves the part closing in problem of small inner cavity and different holes, can push away extensively in technical field of mechanical processing
Wide application.
Detailed description of the invention
Fig. 1 is aircraft engine flow regulator component diagram；
Fig. 2 is structure enlargement diagram at the A of Fig. 1；
Fig. 3 is the structural schematic diagram of closing in idler wheel in the present invention；
Fig. 4 is structure enlargement diagram at the B of Fig. 3；
Fig. 5 is the end view to close up in screw-rolling machine upper roller.
In figure: 1- shell, 2- oily filter, 3- bridge pipe, 4- idler wheel, 5- cushion block, 6- part, the left side 11- outer circle, 12- annular
Groove D, 13- annular groove C, 21- oily filter end face, 22- annular groove B, 23- annular groove A, 24- transition cylinder, 41- idler wheel
End face, 42- idler wheel outer circle, 43- transition outer groove, the end face 44- cylinder, the left end 45- outer circle, 46- roller inner holes, 47- keyway,
48- protrusion outer circle A, 49- protrusion outer circle B, 50- protrusion outer circle C, 51- protrusion outer circle D.
Specific embodiment
Technical solution of the present invention is further described with reference to the accompanying drawing, but claimed range is not limited to institute
It states.
A kind of closing method of flow regulator bridge pipe of the present invention, steps are as follows for specific method:
(1) it selects equipment screw-rolling machine: determining the flat key size on the screw-rolling machine diameter of axle and rolled thread arbor；It is provided for idler wheel design
Input data guarantees that idler wheel and screw-rolling machine connecting portion size are harmonious.
(2) manufacture and design idler wheel: as shown in Figure 3, Figure 4, idler wheel 4 is designed as the rotary structure that one group of diameter does not wait, rolling
Idler wheel end face 41 on wheel 4 is axial datum level, and idler wheel outer circle 42 is the radial reference face of idler wheel, setting and rolling on idler wheel 4
The roller inner holes 46 that silk arbor diameter matches, and keyway 47 is provided among idler wheel 4.On the keyway 47 and rolled thread arbor
Flat key cooperation, size and its cooperation are designed by general flat key connection request；The diameter of the idler wheel outer circle 42 is according to screw-rolling machine
Centre-height design；Guarantee that idler wheel and screw-rolling machine connecting portion size are harmonious, rolling space is suitable.
(3) idler wheel is installed: two idler wheels 4 are mounted on screw-rolling machine main shaft, the axial position of idler wheel 4 is adjusted, makes two rollings
The idler wheel end face 41 of wheel 4 is in the same plane, chooses the cushion block 5 of reasonable altitudes, and cushion block 5 is installed on to the work of screw-rolling machine
On table top, flow regulator modular support is after cushion block 5 and beam idler wheel centre, the axis of two idler wheels, flow regulator component
Axis is on horizontal plane；
(4) Assembly part: by the shell 1 of flow regulator component and the assembly of oily filter 2 in 3 inner hole of bridge pipe；
(5) adjust pressure of thread rolling machine: pressure of thread rolling machine chooses 1.5MPa ± 0.1MPa；Pressure is suitable, guarantees to close up sufficiently,
But shell and oily filter cannot be made to deform.
(6) close up: starting screw-rolling machine, two main shaft of screw-rolling machine drives the rotation of idler wheel 4 main shaft, as shown in figure 5, will assemble
Part 6 is placed among cushion block 5 and two idler wheels 4, is bonded oily filter end face 21 with the idler wheel end face 41 on idler wheel 4, idler wheel 4 makees radial direction
Feeding, idler wheel 4 is to the symmetrical radial compression of part 6 assembled, continuous spinning, to cylindrical die roll radial feed to spacing place, part
After 6 rotation, 2 circle, idler wheel 4 retracts original position, completes flow regulator component and closes up.
Roller material in the step (2) is 45# steel, is heat-treated HRC35 ∽ 40.
The cooperation of roller inner holes 46 and the screw-rolling machine diameter of axle uses H7/h6 in the step (2).
41 left end of idler wheel end face be located in idler wheel outer circle 42 be respectively arranged with raised outer circle A48, raised outer circle B49,
Raised outer circle C50, raised outer circle D51.
The right end of the left hand projection outer circle A48 of the idler wheel end face 41 is right-angle surface, the fillet surface that left end is 45 °.
The protrusion both ends outer circle B49 are 45 ° of chamferings.
The protrusion both ends outer circle C50 are 45 ° of chamferings.
The left end of the protrusion outer circle D51 is right-angle surface, the fillet surface that right end is 45 °.
The right-angle surface of the protrusion outer circle D51 is provided with left end outer circle 45, the left side outer circle in left end outer circle 45 and shell 2
11 match.
The shape surface of revolution of the idler wheel 4 is 0.03mm to the concentricity tolerances of roller inner holes 46, end face to the surface of revolution and
Run-out tolerance to roller inner holes 46 is 0.05mm.
Illustrate implementation steps of the invention through a step below with reference to embodiment:
The flow regulator being made of as shown in Figure 1 and Figure 2 shell 1, oily filter 2, bridge pipe 3, axial benchmark are oily filters 2
On oily filter end face 21, radial reference is the outer circle φ d of oily filter 2, and the diameter phi d of benchmark outer circle is 15mm；Oily filter end face 21
Place right side is the outer groove having a size of 4mm × 3.5mm, is successively 4 annular groove A23 to the left by oily filter end face 21, annular recessed
Slot B22, annular groove C13, annular groove D12, the depth of 4 annular grooves is 0.6mm；The right end of annular groove A23 is straight
Edged surface, left end are 45 ° of fillet surfaces, are connected between annular groove A23 and oily filter end face 21 with transition cylinder 24, transition cylinder 24
The slot bottom depth of external cylindrical surface to annular groove A23 are 1.1mm, and the slot bottom width of annular groove A23 is 1mm, transition cylinder 24
Width be 1mm；The two sides of annular groove B22 are 45 ° of fillet surfaces, the distance at the center annular groove B22 to oily filter end face 21
For 6mm, the slot bottom width of annular groove B22 is 3mm；Annular groove C13 structure size is identical as annular groove B22, and annular is recessed
Slot D12 is similar to the structure of annular groove A23, and left end is right-angle surface, and right end is 45 ° of fillet surfaces, and the inner hole of bridge pipe 3 is straight
It is φ d, wall thickness 0.6mm that diameter, which is equal to radial reference outside diameter, and shell 1, oily filter 2 are assemblied in the both ends of bridge pipe 3, shell respectively
Left end at 1 closing in of body is left side outer circle 11, and the diameter of left side outer circle 11 is that benchmark outside diameter is φ d plus 2 times of bridge pipes
3 wall thickness, the diameter of outer circle 11 is 15+2 × 0.6=16.2mm on the left of the present embodiment, it is desirable that bridge pipe 3 is in annular groove
It closes up at C13 and annular groove D12 and forms flow regulator component.
Below above-mentioned bridge pipe 3 close up using method of the present invention and form flow regulator component, had
Steps are as follows for body method:
(1) it selects equipment screw-rolling machine: being required according to the size of bridge pipe 3 to be closed up, select the screw-rolling machine diameter of axle for 54mm, roll
The size of flat key on silk arbor is 12mm；
(2) manufacture and design idler wheel 4: as shown in Figure 3, Figure 4, the material selection 45# steel of idler wheel 4 is heat-treated HRC35 ∽ 40,
Processing quantity is 2, and the structure size of 2 idler wheels 4 is identical with technical requirements；
Roller inner holes 46 are provided on idler wheel 4, it is 54mm that the diameter of roller inner holes 46 is identical as the screw-rolling machine diameter of axle,
The cooperation of roller inner holes 46 and the screw-rolling machine diameter of axle uses H7/h6；The flat key being provided among idler wheel 4 on keyway 47 and rolled thread arbor
Cooperation, the width of keyway 47 are that the cooperation of flat key on 12mm, with screw-rolling machine is designed by general flat key requirement；4 shape of idler wheel is one
The not equal revolving body of group diameter, the idler wheel end face 41 on idler wheel 4 is axial datum level, and idler wheel outer circle 42 is the radial reference of idler wheel
The diameter in face, idler wheel outer circle 42 is designed according to the centre-height of screw-rolling machine, the diameter design value of idler wheel outer circle 42 in the present embodiment
For 130mm；41 left end of idler wheel end face is 4 raised raised outer circle A48, raised outer circle B49, raised outer circle C50, raised outer circle
D51；And raised outer circle A48, raised outer circle B49, raised outer circle C50, raised outer circle D51 respectively with it is recessed on flow regulator
Sunken annular groove A23, annular groove B22, annular groove C13, annular groove D12 are corresponding, 4 raised raised outer circle A48,
Raised outer circle B49, raised outer circle C50, the height of projection of raised outer circle D51 and annular groove A23, annular groove B22, annular are recessed
Slot C13, the depth of groove of annular groove D12 are identical, are 0.6mm；
The right end of the left hand projection outer circle A48 of idler wheel end face 41 is right-angle surface, the fillet surface that left end is 45 °；Raised outer circle
Distance of the right side of A48 away from idler wheel end face 41 is equal to the distance and L1+0.05mm=of annular groove A23 to oily filter end face 21
1.05mm, wherein L1 is the width of transition cylinder, and the width of raised outer circle A48 is L2- δ × tg22.50+0.1=0.8mm,
Middle L2 is the width of annular groove A23, and δ is the wall thickness of bridge pipe 3；Raised outer circle A48 and idler wheel end face 41 are transition outer grooves
43, transition outer groove 43 and the annular groove A23 in oily filter 2 corresponding, the transition outer groove to the transition outer circle between oily filter end face 21
43 depth is 0.2mm bigger than the slot bottom depth of the external cylindrical surface of transition cylinder 24 to annular groove A23, i.e. 1.1mm+0.2mm=
1.3mm。
The both ends raised outer circle B49 are 45 ° of chamferings, the distance and flow tune at the center raised outer circle B49 to idler wheel end face 41
The distance for saving center to the oily filter end face 21 of the annular groove B22 of device is corresponding, and the width of as 6mm, raised outer circle B49 are L4-2
×δ× tg22.50+ 0.2=2.7mm, wherein L4 is the width of annular groove B22, and δ is the wall thickness of bridge pipe 3, raised outer circle
B49 is that transition outer groove 43 is connect with protrusion outer circle A48, and 43 diameter of transition outer groove is radial reference diameter；
The structure design of raised outer circle C50 and raised outer circle D51 is similar to raised outer circle A48, protrusion outer circle B49 is set
Meter；
The right end of idler wheel end face 41 is end face cylinder 44, and the depth of end face cylinder 44 to transition outer groove 43 is h2+1mm=
4.5mm, the wherein annular width of h2 oily filter end face 21, value is 3.5mm in embodiment, and the width of end face cylinder 44 is 3.5mm；
All shape surfaces of revolution are 0.03mm to the concentricity tolerances of roller inner holes 46 on idler wheel 4, end face to the surface of revolution and
Run-out tolerance to roller inner holes 46 is 0.05mm, and the technique using clamped one time processing guarantees.
(3) idler wheel 4 is installed: two idler wheels 4 manufactured and designed being mounted on screw-rolling machine main shaft, and adjust the axis of idler wheel 4
To position, keep the idler wheel end face 41 of two idler wheels 4 in the same plane, chooses the cushion block 5 of reasonable altitudes, and installation and screw-rolling machine
Work top on；
(4) Assembly part: by shell 1, the assembly of oily filter 2 in the inner hole of bridge pipe 3；
(5) adjust pressure of thread rolling machine: pressure of thread rolling machine is 1.5MPa ± 0.1MPa；
(6) close up: starting screw-rolling machine, screw-rolling machine two main shaft drives the rotation of idler wheel main shaft, as shown in figure 5, will assemble
Part 6 is placed among cushion block 5 and two idler wheels 4, and oily filter end face 21 is bonded with the idler wheel end face 41 on idler wheel 4, and idler wheel 4 makees radial direction
Feeding, idler wheel 4 is to the symmetrical radial compression of Assembly part, continuous spinning, to cylindrical die roll radial feed to spacing place, Assembly part rotation
After turning 2 circles, idler wheel 4 retracts original position, completes flow regulator component and closes up.
Claims (4)
1. a kind of closing method of flow regulator bridge pipe, it is characterised in that: steps are as follows for specific method:
(1) it selects equipment screw-rolling machine: determining the flat key size on the screw-rolling machine diameter of axle and rolled thread arbor；
(2) manufacture and design idler wheel: idler wheel (4) is designed as the rotary structure that one group of diameter does not wait, the idler wheel end face on idler wheel (4)
It (41) is axial datum level, idler wheel outer circle (42) is the radial reference face of idler wheel, setting and screw-rolling machine diameter of axle phase on idler wheel (4)
Matched roller inner holes (46), and keyway (47) are provided among idler wheel (4)；
(3) idler wheel is installed: two idler wheels (4) designed in step (2) are mounted on screw-rolling machine main shaft, is adjusted idler wheel (4)
Axial position, keep the idler wheel end face (41) of two idler wheels (4) in the same plane, choose cushion block (5), and by cushion block (5) pacify
On work top loaded on screw-rolling machine, while it is in the axis of two idler wheels (4) and the axis of part (6) in same level；
(4) Assembly part: the shell (1) of flow regulator component and oily filter (2) are assemblied in bridge pipe (3) inner hole；
(5) adjust pressure of thread rolling machine: pressure of thread rolling machine chooses 1.5MPa ± 0.1MPa；
(6) close up: starting screw-rolling machine, two main shaft of screw-rolling machine drive the rotation of idler wheel (4) main shaft, the part assembled (6) are placed in
Cushion block (5) and two idler wheels (4) are intermediate, are bonded oily filter end face (21) with the idler wheel end face (41) on idler wheel (4), and idler wheel (4) is made
Radial feed, idler wheel (4) is to part (6) the symmetrical radial compression assembled, continuous spinning, to cylindrical die roll radial feed to limit
Place, after part (6) rotation 2 is enclosed, idler wheel (4) retracts original position, completes the closing in of flow regulator bridge pipe；
Idler wheel end face (41) left end, which is located on idler wheel outer circle (42), is respectively arranged with raised outer circle A (48), raised outer circle B
(49), protrusion outer circle C (50), protrusion outer circle D (51)；The right-angle surface of the protrusion outer circle D (51) is provided with left end outer circle (45),
Left end outer circle (45) matches with the left side outer circle (11) on shell (1)；
The right end of the left hand projection outer circle A (48) of the idler wheel end face (41) is right-angle surface, the fillet surface that left end is 45 °；It is described
Raised (49) both ends outer circle B are 45 ° of chamferings；Protrusion (50) both ends outer circle C are 45 ° of chamferings；The protrusion outer circle D (51)
Left end is right-angle surface, the fillet surface that right end is 45 °.
2. a kind of closing method of flow regulator bridge pipe according to claim 1, it is characterised in that: the step
(2) roller material in is 45# steel, is heat-treated HRC35 ∽ 40.
3. a kind of closing method of flow regulator bridge pipe according to claim 1, it is characterised in that: the step
(2) cooperation of roller inner holes (46) and the screw-rolling machine diameter of axle uses H7/h6 in.
4. a kind of closing method of flow regulator bridge pipe according to claim 1, it is characterised in that: the idler wheel
(4) the shape surface of revolution is 0.03mm to the concentricity tolerance of roller inner holes (46), and end face is to the surface of revolution and to roller inner holes
(46) run-out tolerance is 0.05mm.
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| CN201611118685.5A CN106734651B (en) | 2016-12-07 | 2016-12-07 | A kind of closing method of flow regulator bridge pipe |
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| CN108672571A (en) * | 2018-05-21 | 2018-10-19 | 晋西工业集团有限责任公司 | A kind of rolling forming process |
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| CN101625054A (en) * | 2009-08-20 | 2010-01-13 | 中舟海洋科技(上海)有限公司 | Radial extrusion type joint |
| CN102764764A (en) * | 2011-05-06 | 2012-11-07 | 豫北转向***股份有限公司 | Rolling wheel of spline with heterodont tooth and method for processing spline |
| CN202834470U (en) * | 2012-09-14 | 2013-03-27 | 黎志锋 | Connecting structure of thin-walled stainless steel connecting pipe and joint |
| CN103028683A (en) * | 2012-12-27 | 2013-04-10 | 金湖县常盛动力机械配件有限公司 | Processing method for clamp spring slot of roller pin and cutter device thereof |
| CN104395663A (en) * | 2013-05-17 | 2015-03-04 | 日本精工株式会社 | Joint structure, and joint method thereof |
| CN105980078A (en) * | 2014-03-14 | 2016-09-28 | 欧姆龙株式会社 | Crimped structure, crimping method, and electronic device |
| CN105478639A (en) * | 2014-09-16 | 2016-04-13 | 青岛德盛机械制造有限公司 | Thread roller and feeding control system thereof |
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Address after: 550014 No. 1111 Liyang Road, Baiyun District, Guiyang City, Guizhou Province Patentee after: Chinese Hangfa Guizhou Liyang aero Power Co. Ltd. Address before: 561102 Baiyun Town, Pingba County, Anshun City, Guizhou Province Patentee before: Guizhou Liyang Aerospace Power Co., Ltd. |