CN109531086B - Guiding alignment mechanical device and method for large-diameter flange bolt hole - Google Patents
Guiding alignment mechanical device and method for large-diameter flange bolt hole Download PDFInfo
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- CN109531086B CN109531086B CN201811481017.8A CN201811481017A CN109531086B CN 109531086 B CN109531086 B CN 109531086B CN 201811481017 A CN201811481017 A CN 201811481017A CN 109531086 B CN109531086 B CN 109531086B
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Abstract
The invention discloses a guiding and aligning mechanical device and method for a large-diameter flange bolt hole. The two sides of the bottom of the flange of the large-diameter tower cylinder are symmetrically provided with guide assemblies comprising a conical guide part, an alignment guide rod, a cantilever connecting frame and an alignment guide bolt, the two symmetrical threaded holes on the two sides of the bottom of the flange of the large-diameter tower cylinder are provided with the cantilever connecting frames, the alignment guide bolt at one end of the cantilever connecting frame realizes limiting and fixing through a separable positioning shaft collar, the upper end of the alignment guide rod at the other end is connected with a boss through hole through a thread, and the lower end of the alignment guide rod is gradually aligned with the bottom of the conical guide part; the conical guide piece is fixedly installed on the supporting seat on the side of the large-diameter flange base, a cylinder with a cavity in the middle is fixed on the upper end face of a bottom plate of the conical guide piece, a spring damping sheet is installed at the bottom of the cavity, and a vertical notch is formed in one side of the cylinder. The invention relates to a mechanical device for guiding and aligning large-diameter flange bolt holes, which is simple to use and operate, convenient to disassemble and assemble and convenient to install and maintain.
Description
Technical Field
The invention relates to the field of infrastructure mechanical assembly, in particular to a guiding and aligning mechanical device and method for a large-diameter flange bolt hole.
Background
With the continuous promotion and development of the industry 4.0 in China, various heavy machines in large countries emerge endlessly, and the problem of installation of a guiding alignment mechanical device is inevitably involved from the top to the bottom of an aviation aerospace to deep sea engineering. Take deep sea engineering as an example, be praised as super engineering's offshore wind energy machine in renewable energy field, a tower section of thick bamboo height can reach about 90m, its tower section of thick bamboo bottom diameter can reach 6m, link to each other with the base through flange bolted connection form, before a tower section of thick bamboo and pedestal mounting, must aim at every bolt hole and the flange base bolt hole of major diameter flange of major diameter tower section of thick bamboo flange and just can accomplish flange joint one by one, to so huge mechanical device, it is very tricky to aim at tens of bolt holes simultaneously, it is very difficult to accomplish to lean on the mechanical system of pulling righting of crane alone, the adjustment time is lengthy, can lead to economic cost's increase in the time of consuming.
At present, many different mechanical guide devices exist, but most of the mechanical guide devices are used for guiding small mechanical parts, and the design of a few mechanical guide devices used for large mechanical parts is complex, for example, the alignment guide mechanical device of a large-diameter flange bolt hole is difficult to design and manufacture, and the technical requirements for operation and disassembly are high.
According to the requirement of large-scale equipment assembly, in order to save assembly time, reduce assembly labor and bring economic benefits, the design of the guiding alignment mechanical device which is simple to operate and convenient to manufacture has important significance.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a guiding and aligning mechanical device and method aiming at a large-diameter flange bolt hole, which are low in construction difficulty, low in cost and simple in operation.
Guiding and aligning mechanical device for large-diameter flange bolt hole
Guide assemblies are symmetrically arranged on two sides of the bottom of the large-diameter tower cylinder flange, each guide assembly comprises a conical guide piece, an alignment guide rod, a cantilever connecting frame and an alignment guide bolt, the large-diameter tower cylinder flange is connected with a tower crane traction device, the tower crane traction device drives the large-diameter tower cylinder flange to move up and down, the two symmetrical threaded holes on two sides of the bottom of the large-diameter tower cylinder flange are provided with the cantilever connecting frames, one end of each cantilever connecting frame is provided with a groove matched with and arranged on the side surface of the bottom of the large-diameter tower cylinder flange, the upper end surface and the lower end surface of each groove are provided with through holes, and the alignment guide bolts sequentially penetrate through holes on the upper end surface of each groove, threaded holes; a boss extends out of the other end of each cantilever connecting frame, a through hole which penetrates through the boss is formed in the middle of the boss, a vertical alignment guide rod is installed at the other end of each cantilever connecting frame, threads are arranged at the upper end of the alignment guide rod, balls are arranged at the bottom end of the alignment guide rod, the upper end of the alignment guide rod is connected with the boss through hole through threads, and the lower end of the alignment guide rod is aligned with the bottom of the conical guide piece through the balls in a guiding mode.
The conical guide piece is fixedly arranged on a supporting seat on the side of the large-diameter flange base, the bottom of the conical guide piece is a bottom plate with holes at the edge, a cylinder with a cavity in the middle is fixed on the upper end face of the bottom plate, the inner wall of the cavity is formed by coaxially connecting a large conical surface and a small conical surface up and down respectively, the large conical surface and the small conical surface are in smooth transition connection, the upper end of the large conical surface is a large end and communicated with the opening end of the cylinder, the lower end of the small conical surface is a small end and connected with the upper end face of the bottom plate, and a spring damping sheet is arranged at the bottom of the cavity and used for ensuring that an alignment guide rod reduces impact in the alignment; one side of the cylinder is provided with a vertical notch which is communicated with the opening end of the cylinder and is axially communicated, and the upper end of the vertical notch is provided with a fillet.
The openings of the notches of the conical guide pieces in the two guide assemblies are opposite, the opening directions of the notches are aligned with the bolt holes of the large-diameter flange base, and the two bolt holes corresponding to the two conical guide pieces are symmetrical by taking the circle center of the large-diameter flange base as the center; the distance between the center of the conical guide piece and the corresponding bolt hole is equal to the distance between the through holes at the two ends of the cantilever connecting frame.
The installation positions of the conical guide pieces in the two guide assemblies are equal in height, the width of a gap of each conical guide piece is the same as the diameter of the corresponding alignment guide rod, and the diameter of the bottom of a cavity of each conical guide piece is the same as the diameter of a ball at the bottom of the corresponding alignment guide rod.
And the bottom end of the alignment guide bolt is provided with a ball.
The separable locating shaft ring is assembled by two semicircular rings and is easy to disassemble and assemble.
The length of the alignment guide bolt is less than the length of the alignment guide rod.
The cross section of the cantilever connecting frame is an I-beam cross section or other high-strength cross section shapes.
The upper end face of the conical guide piece is slightly higher than the height of the upper surface of the large-diameter flange base.
The alignment guide rod is turned to have a threaded part to be a threaded rod, and is not turned to have a threaded part to be a polished rod.
Second, guide alignment method based on the mechanical device
The method comprises the following steps:
8. a guide alignment method based on a mechanical device as claimed in claims 1-7, characterized by comprising the following steps:
s1: adjusting the mounting position of the conical guide piece according to the position of the large-diameter flange base, so that the opening direction of a notch of the conical guide piece is aligned to bolt holes of the large-diameter flange base, the distance between the center of the conical guide piece and the corresponding bolt hole is equal to the distance between through holes at two ends of the cantilever connecting frame, and then preliminarily aligning the bolt holes of the large-diameter tower barrel flange and the large-diameter flange base through a tower crane traction device, thereby facilitating the subsequent accurate alignment of the bolt holes;
s2: under the action of a tower crane traction device, a large-diameter tower drum flange vertically and downwards moves slowly, and balls at the bottom ends of two aligning guide rods are firstly contacted with a large conical surface of a conical guide piece and roll smoothly without friction approximately; then, the large-diameter tower barrel flange continues to move downwards, the alignment guide rod gradually enters the small conical surface under the guiding action of the large conical surface of the conical guide piece, contacts the small conical surface and performs approximate friction-free smooth rolling, further accurate guiding is performed, the ball at the bottom end of the alignment guide bolt is contacted with the upper surface of the large-diameter flange base and rolls in a small range, the ball aligned with the guide bolt falls into the bolt hole in the upper surface of the large-diameter flange base in the gradual guiding process of the small conical surface of the conical guide piece, and the alignment guide bolt is just contacted with the bolt hole in the upper surface of the large-diameter flange base when the conical guide piece reaches the bottom of the small conical surface, so that the alignment of the bolt holes of the large-diameter tower barrel flange and the large-diameter;
s3: the flange of the large-diameter tower barrel continues to move downwards until the alignment guide rod is contacted with the spring vibration reduction sheet at the bottom end of the conical guide piece, the guide of the alignment guide rod is finished, the flange of the large-diameter tower barrel is completely aligned with the base of the large-diameter flange, at the moment, the flange of the large-diameter tower barrel is not completely contacted with the upper surface of the base of the large-diameter flange, and then actual bolts are inserted into bolt holes of the flange of the large-diameter tower barrel and the base of the large-diameter flange;
s4: disassembling the guide alignment mechanism: after the bolts at the bottom of the conical guide piece are dismantled, the conical guide piece is directly removed along the radial opening direction, and the alignment guide rod, the detachable positioning shaft collar, the alignment guide bolt and the cantilever connecting frame are continuously dismantled until the whole process is finished;
s5: and after all parts are disassembled, continuously moving the large-diameter tower cylinder flange downwards until the large-diameter tower cylinder flange is completely contacted with the upper surface of the large-diameter flange base.
The invention has the beneficial effects that:
1) the invention has simple operation, convenient construction and strong practicability.
2) One end of the aligning guide rod is provided with the ball, so that the friction force is small when the ball acts with the smooth inclined surface of the conical guide piece, and the guide is more stable; one end of the aligning guide bolt is provided with a ball, when deviation occurs in guiding, the ball can roll on the upper surface of the large-diameter flange base, the adjustment is easy, and accurate guiding is realized.
3) The invention adopts a non-permanent bolt connection mode, and can disassemble the guide alignment mechanical device after the guide alignment of the large-diameter flange bolt hole is finished, thereby being convenient for reutilization.
4) The mechanical alignment guide part adopted by the invention is simple, easy to process and manufacture, convenient to install and easy to operate, and does not need special technical operators.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of an alignment guide bar according to the present invention;
fig. 3 is a schematic view of the tapered guide of the present invention.
In the figure: 1. the large-diameter tower flange, 2, an alignment guide bolt, 3, a cantilever connecting frame, 4, an alignment guide rod, 5, a conical guide piece, 6, a large-diameter flange base and 7, a detachable positioning collar.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 1, guide assemblies are symmetrically mounted on two sides of the bottom of a large-diameter tower tube flange 1, each guide assembly comprises a conical guide piece 5, an alignment guide rod 4, a cantilever connecting frame 3 and an alignment guide bolt 2, the large-diameter tower tube flange 1 is connected with a tower crane traction device, the tower crane traction device drives the large-diameter tower tube flange 1 to move up and down, the cantilever connecting frames 3 are mounted on two symmetrical threaded holes on two sides of the bottom of the large-diameter tower tube flange 1, one end of each cantilever connecting frame 3 is provided with a groove matched with and mounted on the side face of the bottom of the large-diameter tower tube flange 1, the upper end face and the lower end face of each groove are provided with through holes, the alignment guide bolts 2 sequentially penetrate through holes on the upper end face of the grooves, the threaded holes of the large-diameter tower tube flange; a boss extends from the other end of each cantilever connecting frame 3, and a through hole which penetrates through the boss is formed in the middle of the boss.
As shown in fig. 2, the other end of each cantilever connecting frame 3 is provided with a vertical alignment guide rod 4, the upper end of each alignment guide rod 4 is provided with a thread, the bottom end of each alignment guide rod 4 is provided with a ball, the upper end of each alignment guide rod 4 is connected with the boss through hole through the thread, and the lower end of each alignment guide rod 4 is guided and aligned with the bottom of the conical guide piece 5 through the ball; the alignment guide 4 is turned with a threaded portion to be a threaded rod 41 and is turned without a threaded portion to be a polished rod 42.
As shown in fig. 3, the conical guide 5 is fixedly installed on the supporting seat at the side of the large-diameter flange base 6, the bottom of the conical guide 5 is a bottom plate with holes at the edge, a cylinder with a cavity in the middle is fixed on the upper end surface of the bottom plate, the inner wall of the cavity is formed by coaxially connecting a large conical surface and a small conical surface up and down respectively, the large conical surface and the small conical surface are in smooth transition connection, the upper end of the large conical surface is a large end and communicated with the opening end of the cylinder, the lower end of the small conical surface is a small end and connected with the upper end surface of the bottom plate, the bottom of the cavity is provided with a spring damping sheet, and the spring damping sheet is used for ensuring that the alignment guide rod; one side of the cylinder is provided with a vertical notch which is communicated with the opening end of the cylinder and is axially communicated, and the upper end of the vertical notch is provided with a fillet.
The guide alignment method of the invention comprises the following steps:
s1: adjusting the mounting position of the conical guide piece 5 according to the position of the large-diameter flange base 6, so that the opening direction of a gap of the conical guide piece 5 is aligned to bolt holes of the large-diameter flange base 6, the distance between the center of the conical guide piece 5 and the corresponding bolt holes is equal to the distance between through holes at two ends of the cantilever connecting frame 3, and then preliminarily aligning the bolt holes of the large-diameter tower barrel flange 1 and the large-diameter flange base 6 through a tower crane traction device;
s2: under the action of a tower crane traction device, the large-diameter tower barrel flange 1 vertically moves downwards, and balls at the bottom ends of the two alignment guide rods 4 are firstly contacted with a large conical surface of the conical guide piece 5 and do friction-free smooth rolling; then, the large-diameter tower barrel flange 1 continues to move downwards, the alignment guide rod 4 gradually enters the small conical surface under the guiding action of the large conical surface of the conical guide piece 5, contacts with the small conical surface and does friction-free smooth rolling, further accurate guiding is realized, the ball at the bottom end of the alignment guide bolt 2 contacts with the upper surface of the large-diameter flange base 6 and rolls in a small range, the ball aligned with the guide bolt 2 falls into the bolt hole in the upper surface of the large-diameter flange base 6 in the gradual guiding process of the small conical surface of the conical guide piece 5, the alignment guide bolt 2 is just contacted with the bolt hole in the upper surface of the large-diameter flange base 6 when the conical guide piece 5 reaches the bottom of the small conical surface, and the alignment of the bolt holes of the large-diameter tower barrel flange 1 and the large-diameter flange base 6 is;
s3: the large-diameter tower barrel flange 1 continues to move downwards until the alignment guide rod 4 is contacted with the spring vibration reduction sheet at the bottom end of the conical guide piece 5, the alignment guide rod 4 is completely guided, the large-diameter tower barrel flange 1 and the large-diameter flange base 6 are completely aligned, and then actual bolts are inserted into bolt holes of the large-diameter tower barrel flange 1 and the large-diameter flange base 6;
s4: disassembling the guide alignment mechanism: after the bolts at the bottom of the conical guide piece 5 are dismantled, the conical guide piece 5 is directly removed along the radial opening direction, and the alignment guide rod 4, the detachable positioning shaft collar 7, the alignment guide bolt 2 and the cantilever connecting frame 3 are continuously dismantled until the whole process is finished;
s5: after all parts are disassembled, the large-diameter tower barrel flange 1 continues to move downwards until the large-diameter tower barrel flange 1 is completely contacted with the upper surface of the large-diameter flange base 6.
The invention relates to a guiding and aligning mechanical device for a bolt hole of a large-diameter flange, which adopts the basic aligning principle of the bolt hole as follows: the principle of "two-point one-surface" datum plane positioning is used, i.e. the two alignment guides 3 are to be understood as two points and the lower surface of the large-diameter tower flange 1 is to be understood as one surface.
The technical contents and technical features of the present invention are as described above, however, those skilled in the art can still disclose the changes and modifications without departing from the spirit of the present invention, and the scope of the present invention is not limited to the description of the embodiments, but should include the essence of the spirit of the present invention and is covered by the claims of the present patent application.
Claims (8)
1. The guiding and aligning mechanical device for the bolt hole of the large-diameter flange is characterized in that guiding components are symmetrically arranged on two sides of the bottom of a flange (1) of a large-diameter tower tube and comprise a conical guiding piece (5), an aligning guide rod (4), a cantilever connecting frame (3) and an aligning guide bolt (2), the cantilever connecting frame (3) is arranged in two symmetrical threaded holes on two sides of the bottom of the flange (1) of the large-diameter tower tube, a groove matched with and arranged on the side face of the bottom of the flange (1) of the large-diameter tower tube is formed in one end of each cantilever connecting frame (3), through holes are formed in the upper end face and the lower end face of each groove, and the aligning guide bolt (2) sequentially penetrates through a through hole in the upper end face of each groove, a threaded hole in the flange (1) of the large-; a boss extends out of the other end of each cantilever connecting frame (3), a through hole which penetrates through the boss is formed in the middle of the boss, a vertical alignment guide rod (4) is mounted at the other end of each cantilever connecting frame (3), threads are arranged at the upper end of the alignment guide rod (4), balls are arranged at the bottom end of the alignment guide rod, the upper end of the alignment guide rod (4) is connected with the boss through hole through the threads, and the lower end of the alignment guide rod (4) is in guide alignment with the bottom of the conical guide piece (5) through the balls;
the conical guide piece (5) is fixedly arranged on a supporting seat at the side of the large-diameter flange base (6), the bottom of the conical guide piece (5) is a bottom plate with holes at the edge, a cylinder with a cavity in the middle is fixed on the upper end face of the bottom plate, the inner wall of the cavity is formed by coaxially connecting a large conical surface and a small conical surface up and down, the upper end of the large conical surface is a large end and communicated with the opening end of the cylinder, the lower end of the small conical surface is a small end and connected with the upper end face of the bottom plate, and a spring damping sheet is arranged at the; one side of the cylinder is provided with a vertical notch which is communicated with the opening end of the cylinder and is axially communicated, and the upper end of the vertical notch is provided with a fillet.
2. The guide alignment mechanism for large diameter flange bolt holes of claim 1, wherein: the opening directions of the vertical gaps of the conical guide pieces (5) in the two guide assemblies are opposite, the opening directions of the vertical gaps are aligned to the bolt holes of the large-diameter flange base (6), and the two bolt holes corresponding to the two conical guide pieces (5) are symmetrical by taking the circle center of the large-diameter flange base (6) as the center; the vertical distance between the central axis of the cylinder of the conical guide piece (5) and the corresponding bolt hole is equal to the distance between the through holes at the two ends of the cantilever connecting frame (3).
3. The guide alignment mechanism for large diameter flange bolt holes of claim 1, wherein: the installation positions of the conical guide pieces (5) in the two guide assemblies are equal in height, the width of a vertical gap of each conical guide piece (5) is the same as the diameter of the corresponding alignment guide rod, and the diameter of the bottom of a cavity of each conical guide piece (5) is the same as the diameter of a ball at the bottom of the corresponding alignment guide rod (4).
4. The guide alignment mechanism for large diameter flange bolt holes of claim 1, wherein: and the bottom end of the aligning guide bolt (2) is provided with a ball.
5. The guide alignment mechanism for large diameter flange bolt holes of claim 1, wherein: the separable locating shaft ring (7) is formed by assembling two semicircular rings.
6. The guide alignment mechanism for large diameter flange bolt holes of claim 1, wherein: the length of the alignment guide bolt (2) is smaller than that of the alignment guide rod (4).
7. The guide alignment mechanism for large diameter flange bolt holes of claim 1, wherein: the cross section of the cantilever connecting frame (3) is an I-beam cross section.
8. A method of guiding alignment of a mechanical device according to any of claims 1 to 7, comprising the steps of:
s1: adjusting the mounting position of a conical guide piece (5) according to the position of a large-diameter flange base (6), so that the opening direction of a vertical notch of the conical guide piece (5) is aligned to a bolt hole of the large-diameter flange base (6), the vertical distance between the central axis of a cylinder of the conical guide piece (5) and the corresponding bolt hole is equal to the distance between through holes at two ends of a cantilever connecting frame (3), and then preliminarily aligning bolt holes of a large-diameter tower barrel flange (1) and the large-diameter flange base (6) through a tower crane traction device;
s2: under the action of a tower crane traction device, a large-diameter tower barrel flange (1) vertically moves downwards, and balls at the bottom ends of two alignment guide rods (4) are firstly contacted with a large conical surface of a conical guide piece (5) and do friction-free smooth rolling; then, the large-diameter tower barrel flange (1) continues to move downwards, the alignment guide rod (4) gradually enters a small conical surface under the guiding action of the large conical surface of the conical guide piece (5), contacts with the small conical surface and does friction-free smooth rolling, further accurate guiding is realized, the ball at the bottom end of the alignment guide bolt (2) is contacted with the upper surface of the large-diameter flange base (6) and rolls in a small range, in the gradual guiding process of the small conical surface of the conical guide piece (5), the ball of the alignment guide bolt (2) falls into a bolt hole in the upper surface of the large-diameter flange base (6), when the conical guide piece (5) reaches the bottom of the small conical surface, the alignment guide bolt (2) is just contacted with a bolt hole in the upper surface of the large-diameter flange base (6), and bolt hole alignment of the large-diameter tower barrel flange (1) and the large-diameter flange base (6) is realized;
s3: the large-diameter tower barrel flange (1) continues to move downwards until the alignment guide rod (4) is contacted with the spring vibration reduction sheet at the bottom end of the conical guide piece (5), the alignment guide rod (4) is completely guided, the large-diameter tower barrel flange (1) and the large-diameter flange base (6) are completely aligned, and then actual bolts are inserted into bolt holes of the large-diameter tower barrel flange (1) and the large-diameter flange base (6);
s4: disassembling the guide alignment mechanism: after the bottom bolt of the conical guide piece (5) is dismantled, the conical guide piece (5) is directly removed along the opening direction of the vertical notch, and the alignment guide rod (4), the separable positioning shaft collar (7), the alignment guide bolt (2) and the cantilever connecting frame (3) are continuously dismantled until the whole process of dismantling is finished;
s5: and after all parts are disassembled, continuously moving the large-diameter tower cylinder flange (1) downwards until the large-diameter tower cylinder flange (1) is completely contacted with the upper surface of the large-diameter flange base (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811481017.8A CN109531086B (en) | 2018-12-05 | 2018-12-05 | Guiding alignment mechanical device and method for large-diameter flange bolt hole |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811481017.8A CN109531086B (en) | 2018-12-05 | 2018-12-05 | Guiding alignment mechanical device and method for large-diameter flange bolt hole |
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| CN109531086B true CN109531086B (en) | 2020-05-22 |
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| CN111554415B (en) * | 2020-05-15 | 2022-02-11 | 中国核动力研究设计院 | Guide positioning structure for assembling top cover and container of reactor pressure vessel |
| CN112404965B (en) * | 2020-10-27 | 2021-11-23 | 中国科学院沈阳自动化研究所 | High-flexibility screwing assembly method for large length-diameter ratio easily-deformed cylinder section threads |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS56143369A (en) * | 1980-04-07 | 1981-11-09 | Agency Of Ind Science & Technol | Wind force prime mover using propeller |
| DE10223429C1 (en) * | 2002-05-25 | 2003-05-28 | Aloys Wobben | Flange coupling method for wind turbine tower sections with softening of variable viscosity layer between cooperating flange surfaces during formation of flange coupling |
| JP5069171B2 (en) * | 2008-05-22 | 2012-11-07 | 鹿島建設株式会社 | Offshore wind power generation foundation and superstructure joint structure and superstructure installation method |
| CN201792135U (en) * | 2010-07-26 | 2011-04-13 | 保定天威集团有限公司 | Position adjusting tool for wind-power tower flange and cylindrical shell section |
| DE102011001906A1 (en) * | 2011-04-08 | 2012-10-11 | Schuler Pressen Gmbh & Co. Kg | Load distribution element for armature assembly used for base of wind turbine, has several tabs which are projected away from inner side of flange portion to form raising unit that places component inside tower of wind turbine |
| CN202545143U (en) * | 2012-04-27 | 2012-11-21 | 中交四航局第二工程有限公司 | Flexible socket and alignment device for mounting sea fan |
| CN202880659U (en) * | 2012-10-16 | 2013-04-17 | 广东华尔辰海上风电工程有限责任公司 | Driven buffering hoisting equipment of offshore wind turbine generating set |
| CN103203584B (en) * | 2013-04-16 | 2015-10-21 | 江苏龙源振华海洋工程有限公司 | A kind of marine wind electric field major diameter tower drum flange bolt hole dislocation processing method |
| CN205689367U (en) * | 2016-06-17 | 2016-11-16 | 中冶建工集团有限公司 | Guide frame for the assembling of wind power equipment cabin |
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