CN212528411U

CN212528411U - Hinge arm structure for rotating wind turbine blade mould

Info

Publication number: CN212528411U
Application number: CN202020659654.6U
Authority: CN
Inventors: M·罗比塔耶; K·休斯顿; M·布罗德尔
Original assignee: Guruite Mould Taicang Co ltd
Current assignee: Guruite Mould Taicang Co ltd
Priority date: 2020-04-27
Filing date: 2020-04-27
Publication date: 2021-02-12
Anticipated expiration: 2030-04-27
Also published as: WO2021218635A1

Abstract

The utility model discloses a hinge arm structure for rotating wind turbine blade mould, it includes rotatory round pin, rotates and the top hinge arm and the bottom hinge arm of connecting through rotatory round pin. The rotation pin is rotatable about a hinge axis at least in the bottom hinge arm and is translationally fixed in the bottom hinge arm by a fixing mechanism comprising a mounting plate, a washer and a fixing member. The top hinge arm obtained by welding the two top hinge arm plates has light weight, high structural strength and low cost; the use of a hinged beam tie-down plate connected to the bottom hinge arm by one or more cylinder pins can reduce production costs; the hinge arm and the hinge beam are connected by a hinge beam tie-down plate and a fastener, the hinge beam tie-down plate and the fastener can increase the connection point between the hinge arm and the hinge beam and improve the stress structure at the joint of the hinge arm and the hinge beam; the swivel pin connecting the top hinge arm and the bottom hinge arm has the characteristics of low cost, high processing yield and easy operation without any special installation kit.

Description

Hinge arm structure for rotating wind turbine blade mould

Technical Field

The utility model relates to a wind turbine blade mould makes the field, specifically is a hinge arm structure for rotating wind turbine blade mould.

Background

It is known in the prior art to provide a hinge arm structure for turning a wind turbine blade mould. Typically, the hinge arm structure comprises a bottom hinge arm for fitting to a lower mould part of the wind turbine blade mould and a top hinge arm for fitting to an upper mould part of the wind turbine blade mould. A hinge mechanism rotatably connects the top hinge arm to the bottom hinge arm to allow the top hinge arm to rotate about a hinge axis between a lower position and an upper position. In the lower position, the wind turbine blade mould is in an open configuration with the upper mould part located laterally of the lower mould part, and in the upper position, the wind turbine blade mould is in a closed configuration with the upper mould part located above the lower mould part.

In the prior art, there are two main techniques for opening and closing a wind turbine blade mould. The first technique is to use a double-cylinder driven hydraulic mold opening and closing mechanism for the purpose of mold opening and closing, or to connect a motor and a reducer as a driving source for opening and closing the wind turbine blades. The disadvantage of this method is that the hydraulic mould opening and closing mechanism driven by the double cylinders has two mechanical dead points during the driving of the wind turbine blade moulds to open and close, at which the cylinders cannot switch their direction of movement without the aid of electromagnetic directional valves. In this case, the wind turbine blade mold connected to the hydraulic mold opening and closing mechanism will vibrate, and the hydraulic system will also be subjected to impact, which will have a long-term influence on both the hydraulic system and the wind turbine blade mold.

The second technique is to drive the hydraulic mold opening and closing mechanism with a single cylinder. Although this structure solves the problem of the first technique, it requires that the bottom hinge arm be integrally connected to the hinge beam cinching plate by the master cylinder pin, and the hinge arm be assembled with the hinge beam by the fastener through the fixing hole in the hinge beam cinching plate, which is complicated and expensive in structure.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: in order to overcome the deficiencies of the prior art, the hinge arm structure for rotating the wind turbine blade mold described in the utility model has the advantages of low cost and simple structure.

The solution is as follows: in order to achieve the above object, a hinge arm structure for turning a wind turbine blade mould as described in the present invention is characterized in that the hinge mechanism comprises a rotation pin defining a hinge axis, the hinge arm structure comprises a pair of hinge mechanisms which are spaced apart from each other in a direction parallel to the hinge axis by a distance and the rotation pins of the respective hinge mechanisms are aligned along a common hinge axis, a lower cylinder mounting pin is fitted within the distance, between bottom hinge arms of the pair of hinge mechanisms, wherein the bottom hinge arms are fitted on the hinge beam by a fixing assembly comprising a pair of hinge beam tie-down plates, wherein the hinge beam tie-down plates are mounted on respective ones of opposite sides of the pair of hinge mechanisms, and the lower cylinder mounting pin passes through an upper end of each of the hinge beam tie-down plates and through the bottom hinge arms of the pair of hinge mechanisms, and the lower end of each of the hinged beam captive plates is fitted to the hinged beam. Connecting the bottom hinge arm with the hinged beam tiedown plate via the at least one lower cylinder mounting pin reduces manufacturing costs. The bottom hinge arm and the hinge beam are connected by a hinge beam tie-down plate that increases the connection point between them and improves the stress structure at the junction of the bottom hinge arm and the hinge beam.

As a further preference of the invention, the fixing assembly comprises a first pair and a second pair of hinged beam tie-down plates, and the hinge arm structure comprises a pair of lower cylinder mounting pins, wherein the first pair and the second pair of hinged beam tie-down plates are separated along the longitudinal direction of the hinged beam, each of the first pair and the second pair of hinged beam tie-down plates being fitted to the hinged beam by a respective lower cylinder mounting pin.

As a further preference of the present invention, the lower end of each of the hinge beam tie-down plates is fitted to the hinge beam through a respective hinge beam interface plate attached to the hinge beam, and the plurality of screw members fit the lower end of the respective hinge beam tie-down plate onto the respective hinge beam interface plate. The hinge beam tie-down plate and threaded hinge beam interface plate are used to increase the connection point between the bottom hinge arm and the hinge beam and to improve the stress structure at the junction of the bottom hinge arm and the hinge beam.

As a further preference of the invention, the leveling mechanism is provided between the bottom hinge arm and the hinge beam, wherein the leveling mechanism comprises a part-circular positioning pin attached to the upper surface of the hinge beam, the part-circular positioning pin having a part-circular upper support surface.

As a further preferred feature of the present invention, the partially circular positioning pin is semicircular, and the upper support surface is semicircular.

As a further preference of the present invention, the leveling mechanism comprises a plurality of spacers located between the bottom hinge arm and the hinge beam.

As a further preference of the invention, the top hinge arm comprises a pair of first and second top hinge arm plates assembled together to form a space therebetween within which the bottom hinge arm is received, the rotation pin extending through the pair of top hinge arm plates and the bottom hinge arm therebetween, the rotation pin extending through a first hole and a pair of second holes in the bottom hinge arm, each second hole being located in a respective top hinge arm plate of the top hinge arm, the first hole and the second hole being aligned. The assembly of the two top hinge arm panels results in a top hinge arm that is light weight, structurally strong, and low cost. The rotation pin may exhibit high shear strength by passing through the pair of first and second top hinge arm plates and the bottom hinge arm sandwiched between the pair of first and second top hinge arm plates.

As a further preferred aspect of the present invention, the hinge arm structure further includes: a mounting plate having an inner surface abutting an end of the rotation pin and abutting a surface of the top hinge arm lateral to one of the second apertures, the mounting plate attached to the top hinge arm; a gasket located on an outer surface of the mounting plate; and a stationary member extending through the washer and the mounting plate and attached to the rotation pin, whereby the rotation pin is rotatable about the hinge axis at least in the first hole and translatably secured in the first and second holes by the stationary member. This structure of the rotation pin and the associated fixing mechanism including the mounting plate, the washer and the fixing member are characterized by low cost, high process yield and easy handling without any special mounting kit.

As a further preference of the present invention, the rotation pin is rotatable about the hinge axis in the pair of second holes.

As a further preference of the invention, the fixing member has a threaded end which can be screwed into the rotation pin and an opposite head end which is adjacent to the outer surface of the washer.

As a further preference of the invention, the opposite head end is rotatable against the outer surface of the washer.

As a further preference of the present invention, the washer and the rotation pin are assembled together by a fixing member, and the washer and the rotation pin are rotatable relative to the mounting plate.

As a further preference of the invention, the mounting plate is attached to the top hinge arm by a plurality of threaded members extending through the mounting plate and screwed into the top hinge arm.

As a further preferred aspect of the present invention, the pair of top hinge arm plates are assembled together by welding. The welding of the two top hinge arm plates results in a top hinge arm that is light weight, high structural strength, low cost, and easy to manufacture.

As a further preference of the present invention, the pair of top hinge arm plates have matching shapes and sizes.

As a further preference of the present invention, the opposed inner surfaces of the pair of top hinge arm plates are provided with corresponding opposed cylinder pin housings for mounting the upper cylinder mounting pin in the top hinge arm.

As a further preference of the invention, the opposite inner surfaces of the pair of top hinge arm plates are provided with corresponding structural spacers for providing a space having a predetermined width, and/or the pair of top hinge arm plates are connected by a socket mounting spacer located on a first edge of the top hinge arm and/or a climbing hook located on a second edge of the top hinge arm. These elements ensure a reliable connection between the top hinge arm plates to form a structurally strong top hinge arm.

As another preferable aspect of the present invention, the upper cylinder mounting pin is fitted in the space between the top hinge arms of the pair of hinge mechanisms.

As a further preferred aspect of the present invention, the hydraulic cylinder and the piston assembly are installed between a pair of upper and lower cylinder installation pins.

As a further preference of the invention, a pair of upper cylinder mounting pins fits within the space between the top hinge arms of the pair of hinge mechanisms, and a respective hydraulic cylinder and piston assembly is mounted between each pair of respective upper and lower cylinder mounting pins.

Has the advantages that: compared with the prior art, the utility model discloses a hinge arm structure for rotating wind turbine blade mould has following advantage:

1. the top hinge arm obtained by welding the two top hinge arm plates has light weight, high structural strength and low cost;

2. the use of a hinged beam tie-down plate and the connection of the second cylinder mounting pin(s) to the bottom hinge arm reduces production costs;

3. the bottom hinge arm and the hinge beam are connected through the hinge beam tie-down plate and the hinge beam interface plate through the threaded element, so that the connection point between the bottom hinge arm and the hinge beam can be increased, and the stress structure at the joint of the bottom hinge arm and the hinge beam is improved;

4. the top hinge arm and the bottom hinge arm connected by the main rotating pin have the characteristics of low cost, high processing yield and simplicity in operation, and do not need any special installation kit.

Drawings

Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

fig. 1(a) and 1(b) are schematic side views of a wind turbine blade mould comprising a hinge arm structure according to an embodiment of the invention, the wind turbine blade mould being in an open position in fig. 1(a) and in a closed position in fig. 1 (b);

FIG. 2 is a detailed schematic perspective view of the hinge arm structure on the hinge beam of the wind turbine blade mold of FIGS. 1(a) and 1(b), with the upper and lower molds omitted from FIG. 2, and the hinge arm structure shown in an open position;

FIG. 3 is an enlarged schematic perspective view of an upper portion of the hinge arm structure shown in FIG. 2 with a portion of the hinge arm structure cut away;

FIG. 4 is an exploded schematic perspective view of a top hinge arm of the hinge arm construction shown in FIG. 2;

FIG. 5 is a schematic perspective view of an inner face of a top hinge plate of the top hinge arm of the hinge arm structure shown in FIG. 2;

FIG. 6 is a schematic perspective view of a top hinge arm of the hinge arm structure shown in FIG. 2 assembled from a pair of top hinge plates; while

Fig. 7 is an exploded schematic perspective view of the hinge arm structure on the hinge beam shown in fig. 2, illustrating the assembly of the hinge arm structure on the hinge beam.

Detailed Description

The invention is further explained below with reference to the figures and examples.

Referring to fig. 1 to 7, the present invention provides in a preferred embodiment a hinge arm structure for turning a wind turbine blade mould (2).

As shown in particular in fig. 1(a) and (b), the hinge arm structure (100) comprises a hinge mechanism (1) comprising a bottom hinge arm (3) for fitting to a lower mould part (4) of the wind turbine blade mould (2) and a top hinge arm (5) for fitting to an upper mould part (6) of the wind turbine blade mould (2). The hinge mechanism (1) rotatably connects the top hinge arm (5) to the bottom hinge arm (3) to allow the top hinge arm (5) to rotate about the hinge axis between a lower position shown in fig. 1(a) and an upper position shown in fig. 1 (b). In the lower position the wind turbine blade mould (2) is in an open configuration with the upper mould part (6) located laterally of the lower mould part (4), and in the upper position the wind turbine blade mould (2) is in a closed configuration with the upper mould part (6) located above the lower mould part (4).

As shown in fig. 2 to 6 in particular, the lower and upper mold portions (4, 6) are omitted for clarity, and the hinge arm structure (100) includes a pair of hinge mechanisms (1) spaced apart from each other by a certain distance (S1) in a direction parallel to the hinge axis (H-H). The bottom hinge arm (3) is attached, preferably by welding, to a lateral support plate (95) that helps to define the spacing (S1) between the pair of hinge mechanisms (1). The transverse support plate (95) is provided with mounting points (99) for mounting the lower mould part (4) to the hinge arm structure (100). Each hinge mechanism (1) comprises a rotation pin (8) defining a hinge axis (H-H). The swivel pins (8) of the respective hinge mechanisms (1) are aligned along a common hinge axis (H-H).

The rotation pin (8) extends through a first hole (9) in the bottom hinge arm (3) and a second hole (10) in the top hinge arm (5), the first and second holes (9,10) being aligned.

The mounting plate (11) has an inner surface (12) that abuts an end (20) of the pivot pin (8). The inner surface (12) also abuts a surface (13) of the top hinge arm (5), which surface (13) is lateral to the second hole (10).

A mounting plate (11) is attached to the top hinge arm (5). In the illustrated embodiment, the mounting plate (11) is attached to the top hinge arm (5) by a plurality of threaded members (19), the threaded members (19) extending through the mounting plate (11) and being screwed into the top hinge arm (5).

The gasket (14) is located on an outer surface (23) of the mounting plate (11). The fixing member (15) extends through the washer (14) and the mounting plate (11) and is attached to the rotation pin (8).

The rotation pin (8) is rotatable about a hinge axis (H-H) in at least a first hole (9) and is translationally fixed in the first and second holes (9,10) by a fixing member (15).

The fixing member (15) has a threaded end (16) and an opposite head end (17), the threaded end (16) being screwed into the rotation pin (8), the opposite head end (17) being adjacent to an outer surface (18) of the washer (14). Typically, the opposite head end (17) is rotatable against an outer surface (18) of the washer (14). The washer (14) and the rotation pin (8) are assembled together by a fixing member (15). Preferably, the washer (14) and the rotation pin (8) are rotatable relative to the mounting plate (11).

In the embodiment shown, the rotation pin (8) is also rotatable in the second hole (10) about the hinge axis (H-H) such that the rotation pin (8) is freely rotatable in the first and second holes (9, 10). This can be achieved by mounting the washer (14) so as to be rotatable relative to the fixed mounting plate (11).

In an alternative embodiment, the rotation pin (8) cannot rotate around the hinge axis (H-H) also in the second hole (10), so that the rotation pin (8) can rotate freely in the first hole (9) but cannot rotate freely in the second hole (10). This can be achieved by mounting the washer (14) attached to the mounting plate (11) so that the washer cannot rotate relative to the fixed mounting plate (11).

In each of the various embodiments of the present invention, to limit the translational movement of the rotation pin (8), the top hinge arm (5) is mounted with a mounting plate (11) and a washer (4). The mounting plate (11), washer (4) and fixing member (15) are used to prevent the rotation pin (8) from inadvertently sliding partially or completely out of the top hinge arm (5). However, the rotation pin (8) can be easily mounted into the top hinge arm (5) by sliding the rotation pin (8) into the second hole (10) from the outside of the hinge arm structure (1) and also into the first hole (9) of the bottom hinge arm (3). Thereafter, the swivel pin (8) is securely and easily translationally fixed in the top hinge arm (5) by fixing the mounting plate (11) to the top hinge arm (5) and then fixing the washer (4) to the swivel pin (8) by the fixing member (15).

The structure of the top hinge arm (5) will now be described with particular reference to fig. 4 to 6.

In the illustrated embodiment, the top hinge arm (5) includes a pair of top hinge arm plates (19) that are assembled together, preferably by welding, to form a space therebetween (S2). Typically, a pair of top hinge arm plates (19) are of matching shape and size.

The bottom hinge arm (3) is received in the space (S2). The rotation pin (8) extends through the pair of top hinge arm plates (19) and the bottom hinge arm (3) therebetween.

The opposite inner surfaces (21) of the pair of top hinge arm panels (19) are provided with respective structural spacers (24) for providing a space (S2) having a predetermined width. In the assembled top hinge arm (5), the pair of top hinge arm plates (19) are connected by a jack mount spacer (25) located on a first edge (26) of the top hinge arm (5) and by a climbing hook (27) located on a second edge (28) of the top hinge arm (5).

The opposite inner surfaces (21) of the pair of top hinge arm plates (19) are provided with respective opposite cylinder pin housings (22). An upper cylinder mounting pin (52) is mounted in the opposing cylinder pin housings (22) of the pair of top hinge arm plates (19), and the upper cylinder mounting pin (52) fits within the space (S1) between the top hinge arms (5) of the pair of hinge mechanisms (1).

The lower cylinder mounting pin (54) fits within the space (S1) between the bottom hinge arms (3) of the pair of hinge mechanisms (1).

In a hinge arm structure (1), a hydraulic cylinder and piston assembly (90) is mounted between a pair of upper and lower cylinder mounting pins (52, 54). Extension of the hydraulic cylinder and piston assembly raises the top hinge arm (5) to close the mould (2) and conversely retraction of the hydraulic cylinder and piston assembly lowers the top hinge arm (5) to open the mould (2). In one embodiment of the present invention, only one hydraulic cylinder and piston assembly is provided.

In the preferred embodiment shown, two upper cylinder mounting pins (52) are provided, and correspondingly two lower cylinder mounting pins (54) are provided. A respective hydraulic cylinder and piston assembly (90) is mounted between each pair of respective upper and lower cylinder mounting pins (52, 54). The preferred arrangement of two mounted hydraulic cylinders and piston assemblies avoids any mechanical dead-spots during opening and closing of the mould (2). In the preferred embodiment shown, the mould (2) can also be opened and closed without any undesired vibrations.

As shown particularly in fig. 7, the bottom hinge arm (3) is mounted to the hinge beam (50) by a fixing assembly (56), the fixing assembly (56) comprising a pair of hinge beam tie-down plates (58). A hinge beam tie plate (58) is mounted on a respective one of the opposite sides of the pair of hinge mechanisms (1). A lower cylinder mounting pin (54) passes through the upper end (60) of each of the hinge beam tie-down plates (58) and through the bottom hinge arm (3) of the pair of hinge mechanisms (1). The lower end (62) of each of the hinged beam tie-down plates (58) is assembled to the hinged beam (50). In the illustrated embodiment, the securing assembly (56) includes first and second pairs of hinged beam tie-down panels (58), wherein the first and second pairs of hinged beam tie-down panels (58) are spaced apart along the longitudinal direction (L-L) of the hinged beam (50).

The lower end (62) of each of the hinge beam tie-down plates (58) is assembled to the hinge beam (50) through a respective hinge beam interface plate (70), the hinge beam interface plate (70) being attached to the hinge beam (50) preferably by welding. A plurality of threaded members (72) assemble the lower end (62) of the respective hinge beam tie-down plate (58) to the respective hinge beam interface plate (70).

In the shown embodiment, the levelling mechanism (80) is arranged between the bottom hinge arm (3) and the hinge beam (50). The leveling mechanism (80) includes a partially circular, preferably semi-circular, locating pin (82) attached to an upper surface (96) of the hinge beam (50), the partially circular locating pin (82) having a partially circular, preferably semi-circular, upper support surface (84). Typically, the levelling mechanism (80) further comprises a plurality of shims (86) between the bottom hinge arm (3) and the hinge beam (50).

To assemble the hinge arm structure (1), typically a hinge beam interface plate (70) is welded to the hinge beam (50), the hinge beam interface plate (70) being provided with a threaded hole (98) to receive the threaded element (72). The bottom hinge arm (3) is assembled as an integral part with the hinge beam tie-down plate (58) using the lower cylinder mounting pin (54) before the bottom hinge arm (3) is placed on the hinge beam (50). Thereafter, the hinge beam (50) and the bottom hinge arm (3) are secured together using a spacer (86) and a threaded member (72), the spacer (86) and the threaded member (72) fitting the lower end (62) of the respective hinge beam tie-down plate (58) to the respective hinge beam interface plate (70). The threaded member (72) passes through an aperture (97) in the hinge beam tie-down plate (58) and threads into a threaded aperture (98) in the hinge beam interface plate (70). Semicircular locating pins (82) and shims (86) (if required) provide a supporting contact between the bottom hinge arm (3) and the hinge beam (50) to adjust the bottom hinge arm (3). After leveling, the semi-circular locating pin (82) may be welded to the upper surface (96) of the hinge beam (50) at a desired location.

The above-mentioned embodiments are only used for illustrating the technical idea and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention is not limited by the embodiments. Any equivalent transformation or modification made according to the spirit of the present invention all belong to the protection scope of the present invention.

Claims

1. A hinge arm structure for a rotating wind turbine blade mould (2), wherein the hinge arm structure (100) comprises: a bottom hinge arm (3) for fitting to a lower mould part (4) of a wind turbine blade mould (2) and a top hinge arm (5) for fitting to an upper mould part (6) of the wind turbine blade mould (2); and a hinge mechanism (1) rotatably connecting the top hinge arm (5) to the bottom hinge arm (3) to allow the top hinge arm (5) to rotate about a hinge axis (H-H) between a lower position and an upper position, characterized in that the hinge mechanism (1) comprises a rotation pin (8) defining the hinge axis (H-H), the hinge arm structure (100) comprises a pair of hinge mechanisms (1) spaced apart from each other by a distance (S1) in a direction parallel to the hinge axis (H-H), and the rotation pins (8) of the respective hinge mechanisms (1) are aligned along a common hinge axis (H-H), a lower cylinder mounting pin (54) is fitted between the bottom hinge arms (3) of the pair of hinge mechanisms (1) within the distance (S1), wherein the bottom hinge arm (3) is mounted on a hinge beam (50) by a fixing assembly (56) comprising a pair of hinge beam tie-down plates (58), wherein the hinge beam tie-down plates (58) are mounted on respective ones of opposite sides of the pair of hinge mechanisms (1), and the lower cylinder mounting pin (54) passes through an upper end (60) of each of the hinge beam tie-down plates (58) and the bottom hinge arm (3) of the pair of hinge mechanisms (1), and a lower end (62) of each of the hinge beam tie-down plates (58) is mounted to the hinge beam (50).

2. The hinge arm structure for turning wind turbine blade molds according to claim 1, characterized in that the fixing assembly (56) comprises a first and a second pair of hinge beam tie-down plates (58) and the hinge arm structure comprises a pair of lower cylinder mounting pins (54), wherein the first and second pair of hinge beam tie-down plates (58) are separated along the longitudinal direction (L-L) of the hinge beam (50), each of the first and second pair of hinge beam tie-down plates (58) being fitted to the hinge beam (50) by a respective lower cylinder mounting pin (54).

3. The hinge arm structure for turning wind turbine blade molds according to claim 2, characterized in that the lower end (62) of each of the hinge beam tie-down plates (58) is fitted to the hinge beam (50) by a respective hinge beam interface plate (70) attached to the hinge beam (50), and a plurality of threaded elements (72) fit the lower end (62) of the respective hinge beam tie-down plate (58) to the respective hinge beam interface plate (70).

4. Hinge arm structure for turning wind turbine blade moulds according to claim 2, characterised in that a levelling mechanism (80) is arranged between the bottom hinge arm (3) and the hinge beam (50), where the levelling mechanism (80) comprises a part circular positioning pin (82) attached to the upper surface (96) of the hinge beam (50), which part circular positioning pin (82) has a part circular upper support surface (84).

5. Hinge arm structure for turning wind turbine blade moulds according to claim 4, characterised in that the part-circular positioning pin (82) is semi-circular and the upper support surface (84) is semi-circular.

6. Hinge arm structure for turning wind turbine blade moulds according to claim 4, characterised in that the levelling means (80) comprises a number of shims (86) between the bottom hinge arm (3) and the hinge beam (50).

7. Hinge arm structure for turning wind turbine blade moulds according to claim 1, characterized in that said top hinge arm (5) comprises a pair of first and second top hinge arm plates (19), the first and second top hinge arm plates being assembled together to form a space (S2) therebetween, the bottom hinge arm (3) being received within the space (S2), and the swivel pin (8) extends through a pair of top hinge arm plates (19) and a bottom hinge arm (3) between them, the rotation pin (8) extends through a first hole (9) and a pair of second holes (10) in the bottom hinge arm (3), each second hole (10) being located in a respective top hinge arm plate (19) of the top hinge arm (5), the first and second holes (9,10) being aligned.

8. The hinge arm structure for turning wind turbine blade moulds according to claim 7, characterised in that the hinge arm structure (100) further comprises: a mounting plate (11) having an inner surface (12) abutting an end (20) of the rotation pin (8) and abutting a surface (13) of the top hinge arm (5), the surface (13) of the top hinge arm (5) being located laterally to one of the second apertures (10), the mounting plate (11) being attached to the top hinge arm (5); a washer (14) located on an outer surface (23) of the mounting plate (11); and a fixation member (15) extending through the washer (14) and the mounting plate (11) and attached to the rotation pin (8), whereby the rotation pin (8) is rotatable about the hinge axis (H-H) in at least the first hole (9) and translationally fixed in the first and second holes (9,10) by the fixation member (15).

9. Hinge arm structure for turning wind turbine blade moulds according to claim 8, characterised in that the rotation pin (8) is rotatable around the hinge axis (H-H) in the pair of second holes (10).

10. Hinge arm structure for turning wind turbine blades moulds according to claim 8, characterised in that the fixing member (15) has a threaded end (16) which is screwed into the turning pin (8) and an opposite head end (17) which is adjacent to the outer surface (18) of the washer (14).

11. Hinge arm structure for turning a wind turbine blade mould according to claim 10, characterised in that the opposite head end (17) is rotatable against the outer surface (18) of the washer (14).

12. Hinge arm structure for turning wind turbine blade moulds according to claim 8, characterised in that the washer (14) and the rotation pin (8) are fitted together by the fixing means (15) and that the washer (14) and the rotation pin (8) are rotatable in relation to the mounting plate (11).

13. Hinge arm structure for turning wind turbine blade moulds according to claim 8, characterised in that the mounting plate (11) is attached to the top hinge arm (5) by a number of screw members extending through the mounting plate (11) and screwed into the top hinge arm (5).

14. Hinge arm structure for rotating wind turbine blade moulds according to claim 7, characterised in that a pair of top hinge arm plates (19) are assembled together by welding.

15. Hinge arm structure for turning wind turbine blades moulds according to claim 7, characterised in that a pair of top hinge arm plates (19) have matching shape and size.

16. Hinge arm structure for turning wind turbine blade moulds according to claim 7, characterised in that the opposite inner surfaces (21) of a pair of top hinge arm plates (19) are provided with respective opposite cylinder pin housings (22) for mounting upper cylinder mounting pins (52) in the top hinge arms (5).

17. Hinge arm structure for turning wind turbine blades moulds according to claim 7, characterised in that the opposite inner surfaces (21) of a pair of top hinge arm plates (19) are provided with respective structural spacers (24) for providing a space (S2) with a predetermined width.

18. Hinge arm structure for rotating wind turbine blade moulds according to claim 7, characterised in that a pair of top hinge arm plates (19) are connected by means of socket mounting spacers (25) on the first edge (26) of the top hinge arm (5).

19. Hinge arm structure for turning wind turbine blades moulds according to claim 7, characterised in that a pair of top hinge arm plates (19) are connected by a climbing hook (27) on the second edge (28) of the top hinge arm (5).

20. Hinge arm structure for turning wind turbine blade moulds according to claim 1, characterised in that an upper cylinder mounting pin (52) is fitted between the top hinge arms (5) of the pair of hinge mechanisms (1) within the spacing (S1).

21. The hinge arm structure for turning a wind turbine blade mould according to claim 20, wherein a hydraulic cylinder and piston assembly (90) is mounted between a pair of upper and lower cylinder mounting pins (52, 54).

22. Hinge arm structure for turning wind turbine blade moulds according to claim 2, characterised in that a pair of upper cylinder mounting pins (52) fits between the top hinge arms (5) of the pair of hinge mechanisms (1) within the space (S1), and that a respective hydraulic cylinder and piston assembly (90) is mounted between each respective pair of upper and lower cylinder mounting pins (52, 54).