CN106624701A - Core assembly tool and method for large turbine blades - Google Patents
Core assembly tool and method for large turbine blades Download PDFInfo
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- CN106624701A CN106624701A CN201611080153.7A CN201611080153A CN106624701A CN 106624701 A CN106624701 A CN 106624701A CN 201611080153 A CN201611080153 A CN 201611080153A CN 106624701 A CN106624701 A CN 106624701A
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- core
- support platform
- fixed
- mobile
- platform
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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
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Load-Engaging Elements For Cranes (AREA)
Abstract
The invention relates to a core assembly tool and method for large turbine blades. The core assembly tool for the large turbine blades comprises a supporting baseplate, wherein a fixed supporting platform is arranged at one end of the supporting baseplate in the length direction, and a hydraulic fixing end is arranged at the other end of the supporting baseplate; two or more parallel supporting guide rails are arranged between the fixed supporting platform and the hydraulic fixing end; a movable supporting platform as high as a supporting face of the fixed supporting platform is arranged on the supporting guide rails in a matched manner; two or more guide wheels matched with the supporting guide wheels are arranged on the bottom side of the movable supporting platform in the directions corresponding to the supporting guide rails; two synchronously acting hydraulic cylinders are arranged on the side, corresponding to the hydraulic fixing end, of the movable supporting platform; the piston rod extending ends of the hydraulic cylinders are connected with corresponding end of the movable supporting platform; the bottoms of the hydraulic cylinders are connected with the hydraulic fixing end; a positioning base plate facilitating propping during installation of a sand core is arranged on the side of the supporting baseplate in the length direction; and the positioning base plate is higher than the supporting face of the fixed supporting platform.
Description
Technical field
The present invention relates to the core manufacturing technology field of large-scale steel-casting, more particularly to a kind of blade of large-sized water turbine group core
Use frock.
Background technology
As shown in figure 1, traditional casting and molding method is all to make casting mold by entity apperance, but due to the hydraulic turbine
The characteristics of Blade roughcast has deep camber, conventional formative method is cored-up mould, and entity apperance is not made in this modeling process,
Core box is only made, conjunction is formed casting mold using screw rod after by core head-on collision combination, both guaranteed the molded line size of blade, dropped again
Low moulding difficulty.
Traditional group core process, mainly by the handling of overhead traveling crane 2, operating personnel command overhead traveling crane by the mobile core 1 of side
The slow fixed core 3 near opposite side, with screw rod conjunction after the completion of docking.The drawbacks of this group of core process is present, main performance
A large amount of overhead traveling crane resources are taken for a group core operation, causes remaining crane operation to suspend, affect manufacturing schedule；Overhead traveling crane handling group core is operated
Difficulty, is not easy precise control core position during handling, be easily caused a group core process core and collide, and occurs damaging existing
As.When simultaneously using overhead traveling crane handling group core, for the precision of small range adjusts difficult in operating process, there is merging precision little
Deficiency, group core efficiency is also low.
The content of the invention
A kind of shortcoming of the present invention for the medium-and-large-sized turbine blade core assembly method of prior art, there is provided large-scale water turbine leaf
Piece group core frock, to improve a group sand efficiency, reduces operation difficulty and is prevented effectively from core damaged in collision in an assembling process.
The object of the present invention is achieved like this, a kind of blade of large-sized water turbine group core frock, including horizontally disposed
Support baseboard, one end of the support baseboard length direction is provided with fixed support platform, and the other end is provided with hydraulic pressure fixing end, described
Two or more parallel supporting guide is provided between fixed support platform and hydraulic pressure fixing end, is matched somebody with somebody on the supporting guide
Conjunction is provided with the level mobile support platform of supporting surface with fixed support platform, the mobile support platform bottom side and each support
The corresponding direction of guide rail is provided with two or more directive wheels coordinated with supporting guide, the mobile support platform correspondence
The side of hydraulic pressure fixing end is provided with the hydraulic cylinder of two synchronization actions, and the piston rod external part of the hydraulic cylinder supports flat with mobile
The corresponding end connection of platform, the cylinder bottom of the hydraulic cylinder is connected with hydraulic pressure fixing end, and the support baseboard length direction laterally sets
Have when being easy to core to install against positioning substrate, the height of the positioning substrate is high higher than the supporting surface of fixed support platform
Degree.
The group core frock of the present invention, arranges fixed support platform and mobile support platform, and during group core, fixed support platform is used
In fixed core is placed, mobile support platform is used for holding movable core, and moves support platform by Driven by Hydraulic Cylinder, realizes
Mobile core is docked with fixed core, can not only improve docking efficiency, shortens the use time of suspender, improves core combination
To the precision for filling, and can prevent large-scale core docking impact from damaging core.
Further, the fixed support platform include some horizontal and vertical parallel shaped steel be welded it is grid-like
Support, the upper surface of the grid-like support forms stayed surface, and the bottom of the grille frame is by some with high support
Post is fixed with support baseboard, and on the outside of the fixed support platform locating dowel for being easy to mount is provided with.
Further, the mobile support platform includes supporting steel plate, and the supporting steel plate bottom is corresponding with supporting guide
Position be fixed with square steel, the directive wheel is installed with square steel and is connected.
For ease of the minimum distance that the mobile support platform of control is relatively fixed support platform, the lattice of the fixed support platform
The side of the mobile support platform of palisade support correspondence is provided with four external parts along the direction parallel with supporting guide, described to stretch out
The elongated end laterally for the corresponding grid rod member of grid-like support is held, wherein, the extension elongation of outermost two external part is big
In the length of two middle external parts, size and two length of the mobile support platform along the width vertical with supporting guide
The home record of external part is equivalently-sized, and mobile support platform is slidably to the inside between two long external parts, the movement
The two short end external part positions cooperation of the fixed support platform of support platform correspondence is provided with the socket groove for being easy to short external part insertion, described
Socket groove is used for spacing mobile support platform to the limit pole position of fixed support platform movement.
The present invention also provides a kind of core assembly method that row blade of large-sized water turbine is put into using above-mentioned group of core recruitment, to be assembled
Blade of large-sized water turbine the fixed core of core point and mobile core, form water after the fixed core and mobile core docking
The die cavity of turbine blade, the cored method includes following processes：The first step, by frock horizontal on group core platform, and makes work
The mobile support platform of dress is in fixed support platform apart from maximum, according to the size of core to be assembled, in fixed support
The graticule for putting fixed core position is demarcated in line on platform, and the graticule is used for root edge on the outside of core and supports flat fixed
The reference of putting position on platform, the positioning substrate is used as the lateral positioning datum of fixed core and mobile core；Second step, will
Fixed core handling is in fixed support platform, and the graticule demarcated by the first step, makes to fix core bottom side outer rim and graticule pair
Together, it is corresponding laterally abut positioning substrate it is lateral；3rd step, will mobile core handling in mobile support platform, and make it is right
That what is answered laterally abuts in the lateral of positioning substrate；4th step, opens Driven by Hydraulic Cylinder movement support platform and drives mobile core to put down
It is quietly close to fixed core direction, until the socket groove of mobile support platform is inserted completely with the short external part of fixed support platform
Bottom is connected to, core is now moved and fixed core is just docked in place,；5th step, by corresponding reserved screw between two cores
Position is locked through socketing screw rod by nut and pad, completes the assembling of turbine blade core.
Hangers is reserved with the outside of the fixed core, is set between the locating dowel on the outside of the hangers and fixed support platform
There is length-adjustable screw arbor assembly, be used to prevent from fixing core after screw arbor assembly is tensed to topple over.
Description of the drawings
Fig. 1 is the core assembly method schematic diagram of the medium-and-large-sized turbine blade of this prior art.
Fig. 2 is the structural representation of the blade of large-sized water turbine group core frock of the present invention.
Fig. 3 is the core assembly method schematic diagram of the present invention.
Fig. 4 is a group schematic diagram for core completion status.
Wherein, 1 core is fixed；2 overhead traveling cranes；3 move a core；4 support baseboards；5 hydraulic pressure fixing ends；6 supporting guides；7 movements
Support platform；7A socket grooves；8 fix support platform；The long external parts of 8A；The short external parts of 8B；8C support columns；9 positioning datums；10 lead
To wheel；11 hydraulic cylinders；12 locating dowels；13 screw arbor assemblies.
Specific embodiment
Embodiment 1
As shown in Fig. 2 for the blade of large-sized water turbine group core frock of the present invention, including horizontally disposed support baseboard 4, supporting
One end of the length direction of base plate 3 is provided with fixed support platform 8, and the other end is provided with hydraulic pressure fixing end 5, fixed support platform 8 and liquid
Two or more parallel supporting guide 6 is provided between pressure fixing end 5, is coordinated on supporting guide 6 and is provided with and fixed support
The level mobile support platform 7 of supporting surface of platform 8, the mobile bottom side of support platform 7 sets with the corresponding direction of each supporting guide 6
There are two or more directive wheels 10 coordinated with supporting guide 6, the side of mobile support platform correspondence hydraulic pressure fixing end 5
The hydraulic cylinder 11 of two synchronization actions is provided with, the piston rod external part of hydraulic cylinder 11 is connected with the corresponding end of mobile support platform 7,
The cylinder bottom of hydraulic cylinder 11 is connected with hydraulic pressure fixing end 5, the length direction of support baseboard 4 be laterally provided with when being easy to core to install against
Positioning substrate 9, the supporting surface height of the height higher than fixed support platform 8 of substrate 9 is positioned, equally also above moving support platform
The height of supporting surface.
The fixed support platform 8 of the present invention includes grid-like that some horizontal and vertical parallel shaped steel are welded
Frame, can adopt the square steel, the isostructural shaped steel of channel-section steel that meet support strength requirement as grid rod member；The grid-like support
Upper surface forms stayed surface, and the bottom of grille frame is fixed with high support column 8C by some with support baseboard 4, fixed
The outside of support platform 8 is provided with the locating dowel 12 for being easy to mount.The locating dowel 12 is used to mount the spiral shell come from fixed core joint face
Bolt assembly, topples over for preventing from fixing core.
The mobile support platform of the present invention includes supporting steel plate, and the supporting steel plate is made up of a steel plate, supporting steel plate
Bottom is fixed with the square steel of support with the corresponding position of supporting guide 6, and directive wheel is installed with square steel and is connected.
For ease of the minimum distance that the mobile support platform 7 of control is relatively fixed support platform 8, the lattice of fixed support platform 8
The side of the mobile support platform 7 of palisade support correspondence is provided with four external parts, external part along the direction parallel with supporting guide 6
For the corresponding grid rod member of grid-like support elongated end laterally, wherein, the extension elongation of outermost two external part is more than
The length of two middle external parts, mobile support platform 7 is stretched out along the size of the width vertical with supporting guide 6 with two length
The home record of end 8A is equivalently-sized, and mobile support platform 7 is slidably to the inside between two long external part 8A, mobile to support flat
The two short end external part 8B positions cooperation of the fixed support platform of the correspondence of platform 7 is provided with the socket groove 7A for being easy to short external part 8B insertions,
Socket groove 7A is used for spacing mobile support platform 7 to the limit pole position of the fixed movement of support platform 8, so as to prevent from moving core with
Fix the distance between core excessively near and core joint unit of wounding.
The group core frock of the present invention, arranges fixed support platform 8 and mobile support platform 7, during group core, fixed support platform
8 are used to place fixed core, and mobile support platform 7 is used for holding movable core, and it is flat to drive movement to support by hydraulic cylinder 11
Platform 7, realizes mobile core and fixes docking for core, can not only improve docking efficiency, shortens the use time of crown block sling,
Precision of the core combination to dress is improved, and can prevent large-scale core docking impact from damaging core.
Embodiment 2
The present embodiment is the group core that blade of large-sized water turbine is carried out using the group core frock of above-described embodiment as shown in Figure 3 and Figure 4
Method, the fixed core 3 of core point of blade of large-sized water turbine to be assembled and mobile core 1, fixed core 3 and mobile core 1
The die cavity of turbine blade is formed after docking, cored method includes following processes：The first step, by frock horizontal in a group core platform
On, and the mobile support platform 7 of frock is in fixed support platform 8 apart from maximum, now, hydraulic cylinder 11 is in contraction
State, according to the size of core to be assembled, the mark for putting the position of fixed core 3 is demarcated in the line in fixed support platform 7
Line, the graticule is used for the reference of root edge putting position in fixed support platform 8 on the outside of core, and positioning substrate 9 is used as fixed sand
The lateral positioning datum of core 3 and mobile core 1；Second step, will fix the handling of core 3 to fixed support platform 8, and by first
The graticule that step is demarcated, makes to fix the bottom side outer rim of core 3 and aligns with graticule, and corresponding laterally abutting is positioning the lateral of substrate 9；For
Prevent from fixing core 3 and topple over, the outside of fixed core 3 is reserved with hangers, the locating dowel 12 in hangers and the fixed outside of support platform 8
Between be provided with length-adjustable screw arbor assembly 13, be used to prevent from fixing core after screw arbor assembly 13 is tensed to topple over.3rd step, will
The mobile handling of core 1 makes corresponding laterally abutting in the lateral of positioning substrate 9 in mobile support platform 7；4th step, opens
Opening hydraulic cylinder 11 drives mobile support platform 7 to drive mobile core 1 smoothly close to the fixed direction of core 3, until mobile
The socket groove 7A of support platform 7 is plugged into completely bottom with the short external part 8B of fixed support platform 8, now moves core 1 and fixes
Core 3 is just docked in place,；5th step, corresponding reserved screwhole position between two cores is run through and sockets screw rod, and by spiral shell
Female and pad is locked, and completes the assembling of turbine blade core.
Using the above-mentioned core assembly method of the present invention, by presetting positioning datum, group core precision is improved, and is once organized core and is arrived
Position, group sand efficiency is also improved therewith, and substantially reduces operation difficulty.
Claims (6)
1. a kind of blade of large-sized water turbine group core frock, including horizontally disposed support baseboard, it is characterised in that the support
The one end in floor length direction is provided with fixed support platform, and the other end is provided with hydraulic pressure fixing end, the fixed support platform and liquid
Two or more parallel supporting guide is provided between pressure fixing end, is coordinated on the supporting guide and is provided with and fixed support
The level mobile support platform of supporting surface of platform, mobile support platform bottom side direction corresponding with each supporting guide sets
There are two or more directive wheels coordinated with supporting guide, the side of the mobile support platform correspondence hydraulic pressure fixing end
The hydraulic cylinder of two synchronization actions is provided with, the piston rod external part of the hydraulic cylinder is connected with the corresponding end of mobile support platform,
The cylinder bottom of the hydraulic cylinder is connected with hydraulic pressure fixing end, when being laterally provided with of the support baseboard length direction is easy to core to install
Against positioning substrate, the supporting surface height of the height of the positioning substrate higher than fixed support platform.
2. blade of large-sized water turbine group core frock according to claim 1, it is characterised in that the fixed support platform
Including the grid-like support that some horizontal and vertical parallel shaped steel are welded, the upper surface of the grid-like support is formed props up
Support surface, the bottom of the grille frame is fixed by some with high support column and support baseboard, the fixed support platform
Outside be provided with the locating dowel for being easy to mount.
3. blade of large-sized water turbine group core frock according to claim 1, it is characterised in that the mobile support platform
Including supporting steel plate, supporting steel plate bottom position corresponding with supporting guide is fixed with square steel, the directive wheel and square steel
Connection is installed.
4. blade of large-sized water turbine group core frock according to claim 2, it is characterised in that described fixed to support flat
The side of the mobile support platform of grid-like support correspondence of platform is provided with four external parts, institute along the direction parallel with supporting guide
To state external part be the corresponding grid rod member of grid-like support elongated end laterally, wherein, outermost two external part stretches out
Length is more than the length of two middle external parts, size of the mobile support platform along the width vertical with supporting guide
It is equivalently-sized with the home record of two long external parts, and mobile support platform is slidably to the inside between two long external parts, it is described
Mobile support platform correspondence is fixed the two short end external part positions cooperation of support platform and is provided with the socket for being easy to short external part insertion
Groove, the socket groove is used for spacing mobile support platform to the limit pole position of fixed support platform movement.
5. a kind of frock using described in any one of claim 1-4 carries out the core assembly method of blade of large-sized water turbine, to be assembled
Blade of large-sized water turbine the fixed core of core point and mobile core, form water after the fixed core and mobile core docking
The die cavity of turbine blade, it is characterised in that the cored method includes following processes：The first step, frock horizontal is put down in a group core
On platform, and the mobile support platform of frock is set to be in fixed support platform apart from maximum, according to the size of core to be assembled,
The graticule for putting fixed core position is demarcated in the line in fixed support platform, and the graticule is used for root edge on the outside of core and exists
The reference of putting position in fixed support platform, the positioning substrate is used as the lateral positioning base of fixed core and mobile core
It is accurate；Second step, will fix core handling to fixed support platform, and the graticule demarcated by the first step, make to fix core bottom side
Outer rim is alignd with graticule, it is corresponding laterally abut positioning substrate it is lateral；3rd step, supports flat by mobile core handling to mobile
On platform, and make corresponding laterally abutting in the lateral of positioning substrate；4th step, opens Driven by Hydraulic Cylinder movement support platform and drives
Mobile core is smoothly close to fixed core direction, until the socket groove of mobile support platform is stretched with fixed the short of support platform
Go out end and be plugged into bottom completely, now move core and fixed core is just docked in place,；5th step, by correspondence between two cores
Reserved screwhole position through socketing screw rod, and be locked by nut and pad, complete the assembling of turbine blade core.
6. core assembly method according to claim 5, it is characterised in that be reserved with hangers on the outside of the fixed core, institute
State and be provided with length-adjustable screw arbor assembly between hangers and the locating dowel on the outside of fixed support platform, use after screw arbor assembly is tensed
Topple in preventing from fixing core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611080153.7A CN106624701B (en) | 2016-11-30 | 2016-11-30 | A kind of blade of large-sized water turbine group core tooling and its core assembly method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611080153.7A CN106624701B (en) | 2016-11-30 | 2016-11-30 | A kind of blade of large-sized water turbine group core tooling and its core assembly method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106624701A true CN106624701A (en) | 2017-05-10 |
| CN106624701B CN106624701B (en) | 2018-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611080153.7A Active CN106624701B (en) | 2016-11-30 | 2016-11-30 | A kind of blade of large-sized water turbine group core tooling and its core assembly method |
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| Country | Link |
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| CN (1) | CN106624701B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107243608A (en) * | 2017-05-27 | 2017-10-13 | 共享装备股份有限公司 | Smallclothes core group core the core of the card device and casting mold and casting method |
| CN110371090A (en) * | 2019-06-26 | 2019-10-25 | 四川嘉泰莅坤智能科技有限公司 | A kind of vehicle pose adjustment platform |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5744177A (en) * | 1996-06-11 | 1998-04-28 | Lin; Rong-Teng | Injection molding assembly |
| CN204748005U (en) * | 2015-07-16 | 2015-11-11 | 唐山开尔热交换设备制造有限公司 | Closing device is used in plate heat exchanger equipment |
| CN204843421U (en) * | 2015-06-25 | 2015-12-09 | 佛冈鑫统仕汽车散热器有限公司 | Radiator core assembly device |
| CN205380826U (en) * | 2015-12-25 | 2016-07-13 | 宁波斗士油压有限公司 | Injection machine back roof displacement device |
| CN105773046A (en) * | 2016-05-25 | 2016-07-20 | 大运汽车股份有限公司 | Assembling fixture for frame assembly |
| CN205618443U (en) * | 2016-03-30 | 2016-10-05 | 沈阳三科泵阀工业有限公司 | Large -scale water pump vane core assembly frock |
-
2016
- 2016-11-30 CN CN201611080153.7A patent/CN106624701B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5744177A (en) * | 1996-06-11 | 1998-04-28 | Lin; Rong-Teng | Injection molding assembly |
| CN204843421U (en) * | 2015-06-25 | 2015-12-09 | 佛冈鑫统仕汽车散热器有限公司 | Radiator core assembly device |
| CN204748005U (en) * | 2015-07-16 | 2015-11-11 | 唐山开尔热交换设备制造有限公司 | Closing device is used in plate heat exchanger equipment |
| CN205380826U (en) * | 2015-12-25 | 2016-07-13 | 宁波斗士油压有限公司 | Injection machine back roof displacement device |
| CN205618443U (en) * | 2016-03-30 | 2016-10-05 | 沈阳三科泵阀工业有限公司 | Large -scale water pump vane core assembly frock |
| CN105773046A (en) * | 2016-05-25 | 2016-07-20 | 大运汽车股份有限公司 | Assembling fixture for frame assembly |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107243608A (en) * | 2017-05-27 | 2017-10-13 | 共享装备股份有限公司 | Smallclothes core group core the core of the card device and casting mold and casting method |
| CN110371090A (en) * | 2019-06-26 | 2019-10-25 | 四川嘉泰莅坤智能科技有限公司 | A kind of vehicle pose adjustment platform |
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| Publication number | Publication date |
|---|---|
| CN106624701B (en) | 2018-09-18 |
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