Lock bolt assembly of fan tower

Abstract

The utility model belongs to the technical field of fastening equipment, and particularly relates to an anti-loose bolt assembly of a fan tower, which comprises a bolt, a nut, a lower sleeve, a friction structure and an upper sleeve which are matched for use, the bolt penetrates from the lower end of a bolt hole in the fan tower, the nut is screwed and fixed from the upper end, the lower sleeve is sleeved on the nut, and the upper sleeve is buckled from the upper part of the bolt tail. The lower sleeve and the upper sleeve are installed respectively, so that the nut and the bolt tail at different screwing positions can be matched, operation is easy, installation is convenient, relative rotation between the lower sleeve and the upper sleeve is limited through the friction structure, and good fastening and loosening effects are achieved. A flange protruding out of the outer edge is arranged at the upper end of the friction block, the upper sleeve comprises an annular groove and a first chamfer, the process that the upper sleeve is inserted into the lower sleeve is smoother through cooperation of the flange, the first chamfer and the annular groove, and the relative position of the upper sleeve and the lower sleeve can be limited.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fastening equipment technical field, concretely relates to a kind of anti-loose bolt assemblies of fan tower. BACKGROUND

[0002] At present, large wind turbine wind tower is connected by multiple sections, and the connection structure of different tower sections generally adopts bolt and nut connection. During the operation of the wind turbine, the tower is subjected to complex stress, and the nut and bolt repeatedly bear the complex load (such as tension, torque, alternating load, impact load, etc.) transmitted by the connected parts for a long time. At this time, the complex load acting on the nut thread forms a loosening torque in the thread circumferential direction, which causes the nut to back off and leads to loose connection. In severe cases, it may cause the tower to fail and cause the wind turbine tower to collapse.

[0003] The existing bolt anti-loose method usually uses a clamping piece to fix and connect the hole or slot of the nut and screw rod from the side. During installation and fastening, the nut and screw rod hole or slot position may not correspond, and if the nut angle is adjusted to align the hole or slot, it may result in poor fastening connection effect. In addition, the wind tower also needs to be regularly maintained and fastened by manual labor, which is time-consuming and labor-intensive. Based on reliability and cost considerations, a tower bolt fastening structure with low technical risk and effective anti-loose function needs to be designed. SUMMARY

[0004] To overcome the shortcomings of the prior art, the utility model provides an anti-loose bolt assembly for a fan tower, which has good fastening and anti-loose effect and is easy to install.

[0005] To solve the above technical problems, the utility model provides an anti-loose bolt assembly for a fan tower, which comprises:

[0006] A bolt and a nut are used together. The bolt includes a bolt head, a threaded rod, and a bolt tail. The two ends of the threaded rod are connected to the bolt head and the bolt tail, respectively, and are threadedly connected to the nut. The bolt tail is in the shape of a polygonal prism and is located inside the end of the threaded rod.

[0007] A lower sleeve includes a first opening, a second opening, and a groove. The first opening and the second opening are located at the two ends of the lower sleeve, respectively. The first opening is compatible with the shape of the nut and is sleeved on the nut. The groove is opened on the inner wall of the lower sleeve.

[0008] A friction structure is elastically and flexibly arranged in the groove.

[0009] The upper sleeve is sleeved on the bolt tail from the top, and the lower end of the upper sleeve is inserted into the lower sleeve from the second opening and elastically abuts against the friction structure.

[0010] Preferably, in the above scheme, the friction structure comprises a friction block and a retaining edge, the upper end of the friction block is provided with the retaining edge protruding from the outer edge, the upper sleeve comprises an annular groove and a first chamfer, the annular groove is arranged on the lower outer side of the upper sleeve and is matched with the retaining edge, and the first chamfer is arranged on the lower end of the upper sleeve.

[0011] Preferably, in the above scheme, the upper sleeve is in a cylindrical shape, and the outer side of the upper sleeve below the annular groove is provided with a frosted surface.

[0012] Preferably, in the above scheme, the thickness of the friction block is greater than the width of the frosted surface, and the upper sleeve further comprises a second chamfer, and the second chamfer is arranged on the lower edge of the annular groove.

[0013] Preferably, in the above scheme, the friction block is in an eccentric fan-shaped wedge structure, and when the nut is rotated in the loosening direction, the lower sleeve is driven to rotate synchronously, so that the eccentric fan-shaped wedge gradually clamps the upper sleeve.

[0014] Preferably, in the above scheme, the upper end of the retaining edge is provided with an inclined surface, and the inclined surface is inclined downward from the long side to the short side of the eccentric fan-shaped wedge.

[0015] Preferably, in the above scheme, the friction structure further comprises a through hole, a sliding column and an elastic member, the through hole is arranged near one end of the eccentric fan-shaped wedge and penetrates the upper and lower surfaces of the friction block, the sliding column is arranged in the through hole and connected with the upper and lower surfaces of the groove at both ends, and the elastic member is arranged on the inner side of the groove and elastically abuts against the long side of the eccentric fan-shaped wedge.

[0016] Preferably, in the above scheme, the elastic member is a spring sheet, both ends of the spring sheet are slidably connected with the upper and lower surfaces of the groove, and the middle part of the spring sheet elastically abuts against the long side of the eccentric fan-shaped wedge.

[0017] Preferably, in the above scheme, the first opening comprises a gasket groove and a nut groove which are sequentially connected, the gasket groove is arranged at the lower end of the lower sleeve, and the nut groove is arranged above the gasket groove.

[0018] Preferably, in the above scheme, a gasket matched with the gasket groove is further arranged, and two gaskets are arranged between the bolt head and the nut.

[0019] Compared with the prior art, the fan tower anti-loose bolt assembly has the following beneficial effects:

[0020] 1. The utility model discloses a fan tower anti-loose bolt assembly, including the bolt and nut of matched use, lower sleeve, friction structure, upper sleeve, when using, first bolt is from the lower end of bolt hole and is passed into the fan tower, the nut is from the upper end of bolt hole and is connected on the bolt and is tightly fixed, then using lower sleeve first opening is connected on the nut, finally using upper sleeve is buckled from the upper side of bolt tail, the upper end is connected on the bolt tail, the outer side after the lower end passes through second opening and is elastically abutted with friction structure, through the installation of lower sleeve and upper sleeve respectively, can adapt to the nut and bolt tail of different tight position, simple operation, convenient installation, through the friction structure, increase the friction between lower sleeve and upper sleeve, thereby limit the relative rotation between lower sleeve and upper sleeve, have good fastening and loosening effect.

[0021] 2. The utility model discloses the upper end of friction block is equipped with the fender of protruding from the outer edge, and the upper sleeve includes annular groove and first chamfer, through the cooperation between fender and first chamfer, annular groove, make the process that upper sleeve inserts into the inside of lower sleeve more smooth, more simple operation can also limit the relative position of upper sleeve and lower sleeve.

[0022] 3. The utility model discloses the upper sleeve is set as cylindrical shape, and the outer side of upper sleeve below annular groove is set as frosted surface, can increase the friction of contact surface with friction block, and the friction block is set as eccentric sector wedge structure, when the nut rotates along the loosening direction, drives lower sleeve synchronous rotation, makes eccentric sector wedge block clamping tight upper sleeve.

[0023] 4. The utility model discloses the upper end of fender is equipped with the inclined plane, and the inclined direction of inclined plane is set as gradually inclines downward from the long side side of eccentric sector wedge block to short side side, when the lower end of upper sleeve contacts with inclined plane and gradually declines, can extrude and guide eccentric sector wedge block and deflect to long side side direction. ACCURACY

[0024] Figure 1 It is the structure schematic drawing of the utility model discloses a fan tower anti-loose bolt assembly.

[0025] Figure 2 It is the installation structure schematic drawing of bolt, nut and gasket of the utility model.

[0026] Figure 3 It is the installation structure schematic drawing of lower sleeve, upper sleeve and friction structure of the utility model.

[0027] Figure 4 It is the internal structure schematic drawing of friction structure of the utility model.

[0028] Figure 5The utility model discloses a mounting structure diagram of friction block and upper sleeve.

[0029] Figure 6 The utility model discloses a structure diagram of friction block.

[0030] Figure 7 The utility model discloses a structure diagram of lower sleeve.

[0031] Figure 8 The utility model discloses a mounting effect diagram of the loosening bolt assembly of the fan tower.

[0032] Among them, 1-bolt, 11-bolt head, 12-threaded rod, 13-bolt tail, 2-nut, 3-lower sleeve, 31-first opening, 311-gasket groove, 312-nut groove, 32-second opening, 33-groove, 4-friction structure, 41-friction block, 42-stop edge, 421-inclined surface, 43-through hole, 44-sliding column, 45-elastic piece, 5-upper sleeve, 51-annular groove, 52-first chamfer, 53-frosted surface, 54-second chamfer, 6-gasket. DETAILED DESCRIPTION

[0033] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0034] In the description of the utility model, it is necessary to explain that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0035] In the description of the utility model, the meaning of several is one or more, and the meaning of multiple is two or more, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If the terms "first", "second", "third" are described, they are only for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0036] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term '' install '' '' link '' '' connection '' '' set '' should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be two element internal communication. For ordinary skilled person in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model. The embodiment is described below according to the overall structure of the utility model.

[0037] As Figures 1-4 The utility model discloses a wind turbine tower's check bolt subassembly, include: matched use bolt 1 and nut 2, lower sleeve 3, friction structure 4, upper sleeve 5, bolt 1 includes bolt head 11, threaded rod 12 and bolt tail 13, the both ends of threaded rod 12 are connected with bolt head 11 and bolt tail 13 respectively, and are connected with nut 2 thread, bolt tail 13 is set to the shape of prism, and is located in the end of threaded rod 12 periphery, lower sleeve 3 includes first opening 31, second opening 32 and recess 33, first opening 31 with second opening 32 are located at the both ends of lower sleeve 3, first opening 31 with the appearance of nut 2 is compatible and is connected on nut 2, recess 33 is set up on the inner wall of lower sleeve 3, friction structure 4 is elastically telescopic in recess 33, the upper end of upper sleeve 5 with the appearance of bolt tail 13 is compatible and is connected from above on bolt tail 13, and the lower end is from second opening 32 and enters the inside of lower sleeve 3 and the outside with friction structure 4 elastic abutment. The embodiment is used, first bolt 1 is from the lower end of bolt hole and enters in the wind turbine tower, uses nut 2 and is connected on bolt 1 from the upper end of bolt hole and is fastened and fixed, then uses lower sleeve 3 and is connected on nut 2 with first opening 31, finally uses upper sleeve 5 and is buckled from the upper bolt tail 13, the upper end is connected on bolt tail 13, and the lower end is elastically abutted with friction structure 4 after passing through second opening 32 outside, by installing lower sleeve 3 and upper sleeve 5 respectively, can be compatible with the nut 2 and bolt tail 13 of different fastening position, simple operation, convenient installation, increase the friction between lower sleeve 3 and upper sleeve 5 through friction structure 4, thereby limiting the relative rotation between lower sleeve 3 and upper sleeve 5, has good fastening and loosening effect.

[0038] As Figure 5As shown, the friction structure 4 in the embodiment includes a friction block 41 and a retaining edge 42, the upper end of the friction block 41 is provided with the retaining edge 42 protruding from the outer edge, the upper sleeve 5 includes an annular groove 51 and a first chamfer 52, the annular groove 51 is arranged on the lower outer side surface of the upper sleeve 5, the width is greater than the thickness of the retaining edge 42, the depth is greater than the width of the retaining edge 42, and can be matched with the retaining edge 42, and the first chamfer 52 is arranged on the lower end outer edge of the upper sleeve 5. Specifically, when the lower end of the upper sleeve 5 penetrates into the second opening 32, the first chamfer 52 abuts against the retaining edge 42, and as the lower end of the upper sleeve 5 gradually descends, the retaining edge 42 is sequentially extruded by the first chamfer 52 and the outer side surface of the upper sleeve 5 and retreats into the recess 33, when the annular groove 51 descends to the position of the retaining edge 42, the retaining edge 42 can be popped out and embedded in the annular groove 51, so that the friction block 41 below the retaining edge 42 elastically abuts against the outer side surface of the upper sleeve 5 below the annular groove 51. It can be understood that through the cooperation between the retaining edge 42 and the first chamfer 52 and the annular groove 51, the process of inserting the upper sleeve 5 into the inside of the lower sleeve 3 is smoother and the operation is simpler, and the relative position of the upper sleeve 5 and the lower sleeve 3 can be limited.

[0039] Further, the upper sleeve 5 is in a cylindrical shape, the outer side surface of the upper sleeve 5 below the annular groove 51 is provided with a frosted surface 53, which can increase the friction force of the contact surface with the friction block 41. It is worth noting that the second opening 32 is matched with the shape of the lower part of the upper sleeve 5, the thickness of the retaining edge 42 is small, and the outer side surface of the retaining edge 42 can be provided as a smooth circular arc surface to avoid generating a large friction resistance when contacting the frosted surface 53.

[0040] The thickness of the friction block 41 in the embodiment is greater than the width of the frosted surface 53, and the lower edge of the friction block 41 is lower than the lower edge of the frosted surface 53. By extruding the lower edge of the friction block 41 with an external tool, the friction block 41 and the frosted surface 53 can be separated from each other, so as to facilitate the disassembly of the lower sleeve 3 and the upper sleeve 5. The upper sleeve 5 further includes a second chamfer 54 arranged on the lower edge of the annular groove 51. When the external tool separates the friction block 41 and the frosted surface 53 from each other, the second chamfer 54 will abut against the retaining edge 42 in the process of pulling out the upper sleeve 5 from above, so that the pulling-out process of the upper sleeve 5 is smoother.

[0041] As Figure 6As shown, the friction block 41 is arranged as an eccentric fan-shaped wedge structure, when the nut 2 rotates in the loosening direction, the lower sleeve 3 is driven to rotate synchronously, so that the eccentric fan-shaped wedge clamps the upper sleeve 3. It can be understood that when the nut 2 rotates, it will first drive the upper sleeve 5 to rotate in a small range, so that the upper sleeve 5 is clamped and locked with the bolt tail 13, and the eccentric fan-shaped wedge and the upper sleeve 5 form a friction ratchet mechanism, and the nut 2 is only affected by the friction force when it is tightened, but it will not be clamped by the eccentric fan-shaped wedge. Four eccentric fan-shaped wedge structures arranged in a circumferential array on the inner wall of the lower sleeve 3 are adopted in the embodiment, which can clamp the outer side of the upper sleeve 5 from four directions, thereby preventing the nut 2 from loosening.

[0042] Further, the upper end of the retaining edge 42 is provided with an inclined surface 421, and the inclination direction of the inclined surface 421 is arranged to gradually incline downward from the long side of the eccentric fan-shaped wedge to the short side. When the lower end of the upper sleeve 5 contacts and gradually descends the inclined surface 421, the eccentric fan-shaped wedge can be pressed and guided to deflect towards the long side.

[0043] Continuing to refer to Figures 4-6 The friction structure 4 in the embodiment further includes a through hole 43, a sliding column 44 and an elastic member 45. The through hole 43 is arranged near one end of the eccentric fan-shaped wedge and penetrates the upper and lower surfaces of the friction block 41. The sliding column 44 is arranged in the through hole 43 and connected with the upper and lower surfaces of the groove 33 at both ends, so as to limit the eccentric fan-shaped wedge in the groove 33. The elastic member 45 is arranged on the inner side surface of the groove 33 and elastically abuts against the long side surface of the eccentric fan-shaped wedge.

[0044] It can be understood that the rotation axis of the eccentric fan-shaped wedge, the contact position of the eccentric fan-shaped wedge and the frosted surface 53, and the central axis of the upper sleeve 5 are located in the same plane. The diameter of the through hole 43 is greater than the diameter of the sliding column 44. One end of the eccentric fan-shaped wedge is slidably connected with the inner side surface of the groove 33. When the nut 2 rotates in the loosening direction, the eccentric fan-shaped wedge is deflected and moved under the action of the friction force, so that one end of the eccentric fan-shaped wedge abuts against and is pressed by the inner side surface of the groove 33. Under the combined action of the reverse support force of the inner side surface of the groove 33 and the elasticity of the elastic member 45, the frosted surface 53 is gradually clamped and locked by the eccentric fan-shaped wedge, thereby preventing the nut 2 from loosening.

[0045] Further, the elastic member 45 is arranged as a spring sheet, and the two ends of the spring sheet are slidably connected with the upper and lower surfaces of the groove 33, and the middle part elastically abuts against the long side surface of the eccentric fan-shaped wedge. It is worth noting that before the upper sleeve 5 is inserted into the inside of the lower sleeve 3, the long side surface of the eccentric fan-shaped wedge is deflected to the outside of the groove 33 under the action of the spring sheet, and the short side surface abuts against the inner wall of the groove 33.

[0046] As Figure 7As shown, the first opening 31 in the embodiment comprises gasket groove 311 and nut groove 312 in turn, the gasket groove 311 is arranged at the lower end of the lower sleeve 3, and the nut groove 312 is arranged above the gasket groove 311. Further, the embodiment also comprises a gasket 6 matched with the gasket groove 311, and two gaskets 6 are arranged between the bolt head 11 and the nut 2, so as to increase the contact area of the bolt head 11 and the nut 2 with the surface of the fan tower, thereby improving the fastening effect, relieving stress distribution, and preventing local pressure from being too high.

[0047] As Figure 8 shown, the bolt assembly in the embodiment is movable in the vertical direction when installed, and the lower sleeve 3 or the upper sleeve 5 can be made of magnetic metal material, so that the bolt assembly is magnetically connected with the fan tower, and the stability of the connecting sleeve structure can be improved.

[0048] The foregoing description of specific exemplary embodiments of the present application is intended to be illustrative only and is not intended to limit the present application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the present application. The exemplary embodiments are chosen and described in order to explain the principles of the present application and its practical application and to allow others skilled in the art to understand the present application for various exemplary embodiments with various modifications as are suited to the particular use contemplated. The scope of the present application is intended to be defined by the claims and their equivalents.

Claims

1. A wind turbine tower anti-loosening bolt assembly, characterized in that, The utility model provides a bolt and nut matched use, the bolt includes bolt head, threaded rod and bolt tail, both ends of threaded rod are connected with bolt head and bolt tail respectively, and are threadedly connected with nut, bolt tail is arranged as the shape of prism, and is arranged in the end of the circumference of threaded rod, The lower sleeve includes a first opening, a second opening, and a groove. The first opening and the second opening are arranged at both ends of the lower sleeve, respectively. The first opening is adapted to the shape of the nut and is sleeved on the nut. The groove is opened on the inner wall of the lower sleeve. The friction structure is elastically and flexibly arranged in the groove. The upper sleeve is adapted to the shape of the bolt tail from above and is sleeved on the bolt tail. The lower end of the upper sleeve penetrates into the inside of the lower sleeve from the second opening and elastically abuts against the friction structure from the outside. The friction structure includes a friction block and a stop edge. The upper end of the friction block is provided with the stop edge protruding from the outer edge. The upper sleeve includes an annular groove and a first chamfer. The annular groove is arranged on the lower outer side of the upper sleeve and is adapted to the stop edge. The first chamfer is arranged on the lower edge of the upper sleeve.

2. A wind turbine tower anti-loosening bolt assembly according to claim 1, wherein The upper sleeve is arranged in a cylindrical shape. The outer side of the upper sleeve below the annular groove is arranged as a frosted surface.

3. A wind turbine tower anti-loose bolt assembly according to claim 2, wherein The thickness of the friction block is greater than the width of the frosted surface. The upper sleeve further includes a second chamfer. The second chamfer is arranged on the lower edge of the annular groove.

4. A wind turbine tower anti-loose bolt assembly according to claim 3, wherein The friction block is arranged as an eccentric sector wedge structure. When the nut is rotated in the loosening direction, the lower sleeve is driven to rotate synchronously, so that the eccentric sector wedge gradually clamps the upper sleeve.

5. A wind turbine tower anti-loosening bolt assembly according to claim 3, wherein The upper end of the stop edge is provided with an inclined surface. The inclined surface is arranged to gradually incline downward from the long side of the eccentric sector wedge to the short side.

6. A wind turbine tower anti-loose bolt assembly according to claim 5, wherein The friction structure further includes a through hole, a sliding column, and an elastic member. The through hole is arranged near one end of the eccentric sector wedge and penetrates the upper and lower surfaces of the friction block. The sliding column is arranged in the through hole and connected with the upper and lower surfaces of the groove at both ends, respectively. The elastic member is arranged on the inner side of the groove and elastically abuts against the long side of the eccentric sector wedge.

7. A wind turbine tower anti-loose bolt assembly according to claim 5, wherein The elastic member is arranged as a spring sheet. Both ends of the spring sheet are slidably connected with the upper and lower surfaces of the groove, respectively. The middle part elastically abuts against the long side of the eccentric sector wedge.

8. A wind turbine tower anti-loose bolt assembly according to claim 7, wherein The first opening includes a gasket groove and a nut groove connected in sequence. The gasket groove is arranged at the lower end of the lower sleeve. The nut groove is arranged above the gasket groove.

9. A wind turbine tower anti-loosening bolt assembly according to claim 1, wherein The utility model further includes a gasket adapted to the gasket groove. Two gaskets are arranged between the bolt head and the nut.

10. A wind turbine tower anti-loosening bolt assembly according to claim 9, wherein ​

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