CN202646258U - Large wind turbine generator barrel-type pylon connection mode without flange - Google Patents

Abstract

The utility model discloses a flangeless connection method of a cylindrical tower of a large-scale wind power unit. The cylindrical tower includes an upper section of the tower and a lower section of the tower. The upper end is welded with a lower connection section; the upper and lower connection sections include two mating cones with equal taper; the two mating cones are tightly fitted together and connected with bolts and nuts through at least one circle of hinged holes. Compared with the conventional connection mode of the large tower tube, the utility model saves a pair of large flanges, reduces the manufacturing cost of the tower tube, and has simple connection mode and reliable strength.

Description

Flangeless connection method of barrel-type tower of large-scale wind turbine

technical field

The utility model relates to the field of large-scale wind turbines, in particular to a flange-less connection method for a cylindrical tower of a large-scale wind turbine.

Background technique

At present, the cylindrical structure of the cylindrical tower of the large-scale wind turbine is the most common structural form of the tower. Cylindrical towers are usually divided into sections for easy transportation. The towers of each section are transported to the installation site separately and then connected on site. Usually, a large flange is welded at the connection end of each section of the tower, and the flanges are connected with bolts at the installation site. Usually, the flange of the tower needs large-scale ring forging equipment to manufacture the blank, and then it can be delivered by machining, and the cost is relatively high.

Utility model content

The purpose of this utility model is to provide a flangeless connection method for the cylindrical tower of a large-scale wind turbine. This connection method can realize the on-site connection of two sections of the tower without a large flange, and can reduce the tower frame of the large-scale wind turbine. cost.

In order to achieve the above object, the utility model adopts the following technical solutions:

A flangeless connection method for a cylindrical tower of a large-scale wind turbine. The cylindrical tower includes an upper section of the tower and a lower section of the tower. The connecting section of the lower section; the connecting section of the upper section and the lower section include two matching cone surfaces with equal taper; the two matching cone surfaces are tightly fitted together and connected by bolts and nuts through at least one circle of hinged holes.

Further, the upper connection section is on the outside, and its matching taper surface is an inner taper surface, and the lower connection section is on the inside, and its matching taper surface is an outer taper surface.

Further, the thickness of the tube wall of the connecting section is thicker than that of the adjacent tower tube wall; and there is a transition section with a slope less than 1:4 at the junction of the connecting section and the adjacent tower tube wall, so that the connection The wall thickness of the section is gradually reduced to be the same as that of the adjacent tower wall.

Further, within the scope of the two matching cone surfaces of the connecting section, the upper and lower circles of hinged holes are evenly arranged according to the circumference. Bolt connection holes are used to connect the hexagonal head hinged holes with bolts and nuts; the hexagonal head hinged holes The bolt axis is perpendicular to the cone surface; and the upper and lower circles of reaming holes are arranged alternately on the circumference with the bolt connection holes.

Further, the nominal size of the diameter of the bolt connection hole for the reaming hole is the same as the nominal size of the diameter of the fitting section of the bolt for the hexagonal head reaming hole, wherein the diameter tolerance of the fitting section of the bolt for the hexagonal head reaming hole is m6, The tolerance of bolted holes for reaming holes is H9.

Further, the outer side of the bolt head of the bolt for reaming the hole is provided with a bolt head side washer, the outer side of the bolt head side washer is a conical surface, and the inner side is a plane, and the adjacent side of the washer and the cylinder wall is spot welded on the inner wall of the lower connecting section The inner side of the nut is also provided with a nut side washer, the outer side of the nut side washer is a plane, and the inner side is a conical surface. .

Further, a rectangular positioning key is welded on the inner conical surface of the upper connection section, the upper side of the rectangular positioning key is a three-sided fillet weld, and the lower side is a several-point plug weld; the outer conical surface of the lower connection section Two positioning plates are welded on the upper edge corresponding to the rectangular positioning key to form a positioning key groove.

Further, a ring-shaped reinforcing rib plate is welded at a certain distance above the matching cone surface of the upper connecting section, and a ring-shaped reinforcing rib plate is welded at a certain distance below the matching cone surface of the lower connecting section.

Further, round holes of a certain diameter are uniformly drilled on the two annular stiffener plates with a certain diameter, and the number of round holes is one-third of the number of bolts in a circle.

The utility model has the following advantages due to the adoption of the above technical scheme:

1. Since the tower connection method of the utility model does not need to use a large flange, the purchase link of the large flange is saved, and the manufacturing cost of the entire tower is reduced.

2. The connection method is simple and the strength is reliable.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the basic structural schematic diagram of the flangeless connection mode of the large-scale wind turbine tower of the utility model;

Fig. 2 is the B direction view in Fig. 1;

Fig. 3 is a sectional view taken along line A-A in Fig. 2 .

Detailed ways

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model.

As shown in Figure 1-3, the flangeless connection method of the large-scale wind turbine tower of the present invention includes the upper tower 1 and the lower tower 12, and the lower end of the upper tower 1 is welded with The upper connecting section 2 and the upper end of the lower tower 12 are welded with the lower connecting section 11; the upper and lower connecting sections 2, 11 include two matching taper surfaces with equal taper; the two matching taper surfaces are tightly fitted together and passed through at least one The ring reamed holes are connected with bolts and nuts. Through the above connection method, the large flange can be saved, and the manufacturing cost of the whole tower can be reduced.

In the above embodiment, preferably, the upper connecting section 2 is on the outer side, and its matching tapered surface is an inner tapered surface, and the lower connecting section 11 is on the inner side, and its matching tapered surface is an outer tapered surface.

In the above embodiment, preferably, the thickness of the tube wall of the connecting section (the upper section connecting section 2, the lower section connecting section 11) is thicker than that of the adjacent tower tube wall (the upper section of the tower 1 wall, the lower section of the tower 2 Tube wall) thick to ensure the connection strength; and there is a transition section with a slope less than 1:4 at the junction of the connecting section and the adjacent tower wall, so that the thickness of the connecting section wall is gradually reduced to the adjacent tower wall The wall thickness is the same so as to be welded with the adjacent tower wall.

In the above-mentioned embodiment, preferably, the upper and lower circles of bolt connection holes for reaming holes are evenly arranged on the circumference of the two matching cone surfaces of the connecting section, and the bolts 6 and nuts 9 for reaming holes through the hexagon head ( Hexagonal nut) connection; hexagonal head reaming hole bolt 6 axes are perpendicular to the cone surface; and the upper and lower circles of reaming hole bolt connection holes are arranged alternately on the circumference.

In the above embodiment, preferably, the nominal size of the diameter of the bolt connection hole for the reaming hole is the same as the nominal size of the diameter of the mating section of the bolt for the hexagonal head reaming hole, wherein the diameter of the mating section of the hexagonal head bolt for the reaming hole The tolerance is m6, and the tolerance of bolted holes for reaming holes is H9.

In the above embodiment, preferably, the bolt head side of the hexagon head reaming hole bolt 6 is provided with a bolt head side washer 7, the outside of the bolt head side washer 7 is a conical surface, and the inside is a plane, and the washer is adjacent to the cylinder wall The side is spot-welded on the inner wall of the lower connecting section 11; the inner side of the nut 9 is also provided with a nut side washer 8, the outer side of the nut side washer 8 is a plane, the inner side is a conical surface, and the adjacent side of the washer and the cylinder wall is spot welded on the upper section On the outer wall of the connecting section 2, the nut 9 is spot-welded on the washer 8 on the nut side at the same time. Wherein, a part with a larger diameter is "outer" than a part with a smaller diameter, and the opposite is "inner".

In the above embodiment, preferably, a rectangular positioning key 4 is welded on the inner conical surface of the upper connecting section 2, the upper side of the rectangular positioning key 4 is a three-sided fillet weld, and the lower side is a several-point plug welding seam; the lower connecting section The upper edge of the outer tapered surface of 11 is welded with two positioning plates 5 correspondingly to the rectangular positioning key 4 to form a positioning keyway; the setting of the positioning key and the positioning keyway is used to ensure that the bolts can accurately penetrate into the two layers during on-site installation. in the hole in the wall.

In the above embodiment, preferably, a ring-shaped reinforcing rib plate 3 is welded at a certain distance above the matching cone surface of the upper connecting section 2, and a ring-shaped reinforcing rib is welded at a certain distance below the matching cone surface of the lower connecting section 11. The plate 10 can enhance the radial rigidity of the connecting section of the tower.

The circular holes with a certain diameter are evenly drilled on the two annular stiffener plates 3 and 10 with a certain diameter, and the quantity of the circular holes is about one-third of the number of bolts in one circle. When assembling on site, by inserting long bolts at the round holes, the upper section of the tower can be pulled down, so that the connection between the two sections of the tower can be better matched.

The implementation method of the flangeless connection method of a large-scale wind turbine tower of the utility model includes the following steps:

(1) Factory manufacturing stage:

①Manufacture of the blank of the upper connecting section: according to the drawing, carry out blanking, tailor welding, coiling, re-tailoring and other processes, complete the manufacturing of the blank of the upper connecting section, including the ring-shaped rib plate of the upper section, and complete the shaping process of the blank;

②Turning: complete the turning of the upper connection section according to the drawings, including the inner fit cone, the lower end surface, the upper transition cone and the upper welding groove;

③ Drilling: complete the drilling process of the upper ring-shaped stiffener plate;

④Complete the manufacturing and processing of the lower connection section according to the same process as above;

⑤ Machining of bolt connection holes for reaming holes: Assemble the upper and lower connecting sections together according to the drawings, and complete the drilling and hinge process;

⑥Complete the assembly and spot welding of washers, nuts and bolts;

⑦Welding of positioning key and positioning plate: Complete the welding of positioning key and positioning plate according to the figure, two positioning plates form a positioning keyway;

⑧ Complete the welding of the upper and lower connecting sections and their adjacent towers (upper and lower towers) according to the diagram;

⑨Complete the manufacture of the entire tower tube according to other normal processes;

⑩Decompose the connection section after the tower is manufactured;

(2) Connection of the tower tube at the installation site:

After the tower tube is transported to the construction site in sections, the next section of the tower tube can be installed first, and then the upper section of the tower tube can be hoisted with a special lifting tool, so that the upper section of the lower end is connected to the lower section of the upper end of the next section of the tower tube. After aligning, lower it slightly to cover the upper end of the lower connecting section; then manually rotate the tower so that the positioning key of the upper connecting section aligns with the positioning keyway of the lower connecting section, and then drop completely; In the round hole of the ring-shaped stiffener plate of the lower section, pull the upper section downwards so that the hinged holes of the upper and lower sections are completely overlapped with the bolt connection holes; at this time, the hinged holes can be installed one by one with bolts, according to the specified process requirements Tighten the bolts with the tightening torque to complete the assembly of a section of the tower.

The following points should be paid attention to in the specific design and process of the joint:

1. It is necessary to determine the specifications and quantities of all bolts in the joint and the wall thickness of the tower in the connecting section according to the various maximum loads on the tower at the connection part of the tower. At the same time, it is necessary to check the fatigue strength of the above parts.

2. The nominal size of the bolt connection hole diameter for reaming holes should be the same as the nominal size of the fitting section diameter of the bolts for reaming holes. The diameter tolerance of the bolt fitting section for reaming holes is recommended to be m6, and the tolerance of bolt connection holes for reaming holes is recommended to be H9.

3. Before on-site assembly, the threaded surface of the bolt, the surface of the bolt mating section and the friction surface of the bolt head must be coated with the specified grease. The tightening torque of the bolts can be the conventional tightening torque under the condition that the friction surface is oiled.

Finally, it should be noted that: the above is only a preferred embodiment of the utility model, and is not intended to limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art , it is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (9)

1. The non-flange connection method of the cylindrical tower of large-scale wind turbines. The cylindrical tower includes an upper section of the tower and a lower section of the tower. The upper end of the barrel is welded with a lower connecting section; the upper and lower connecting sections include two mating cones with equal taper; the two mating cones are tightly fitted together and connected with bolts and nuts through at least one circle of hinged holes. 2. The flangeless connection method of the cylindrical tower of a large-scale wind turbine according to claim 1, characterized in that, the upper connecting section is on the outside, and its matching cone surface is an inner cone surface, and the lower connecting section is on the inside, and its The matching cone surface is the outer cone surface. 3. The non-flange connection method of the cylindrical tower of large-scale wind turbine according to claim 1, characterized in that, the thickness of the wall of the connecting section is thicker than that of the adjacent tower wall; and in the connecting section There is a transition section with a slope of less than 1:4 at the junction with the adjacent tower wall, so that the wall thickness of the connecting section is gradually reduced to the same thickness as the adjacent tower wall. 4. The flangeless connection method of the cylindrical tower of a large-scale wind turbine according to claim 1, characterized in that, within the range of the two matching taper surfaces of the connecting section, the upper and lower hinges are evenly arranged according to the circumference. The holes are connected by bolts, and the hexagonal head hinged holes are connected by bolts and nuts; the axis of the bolts for the hexagonal head hinged holes is perpendicular to the cone surface; and the upper and lower rings of hinged holes are arranged alternately on the circumference . 5. The flangeless connection method of the barrel-type tower of a large-scale wind turbine according to claim 4, characterized in that, the nominal size of the bolt connection hole diameter of the hinged hole and the matching section of the hexagonal head hinged hole bolt The nominal size of the diameter is the same, among which, the diameter tolerance of the bolt fitting section for the reaming hole of the hexagonal head is m6, and the tolerance of the bolt connection hole for the reaming hole is H9. 6. The flangeless connection method of the cylindrical tower of a large-scale wind turbine according to claim 2, wherein the bolt head side of the bolt used for reaming holes is provided with a bolt head side washer, and the outer side of the bolt head side washer is a tapered surface , the inner side is a plane, and the adjacent side of the washer and the cylinder wall is spot welded on the inner wall of the lower connecting section; the inner side of the nut is also provided with a nut side washer, the outer side of the nut side washer is a plane, and the inner side is a conical surface. Adjacent sides are spot-welded on the outer wall of the upper connecting section, and the nut is spot-welded on the washer on the side of the nut. 7. The flangeless connection method of the cylindrical tower of a large-scale wind turbine according to claim 2, wherein a rectangular positioning key is welded on the inner cone surface of the upper connecting section, and the upper side of the rectangular positioning key has three sides Fillet welds, the lower side is a few plug welds; the upper edge of the outer tapered surface of the lower connecting section is welded with two positioning plates corresponding to the rectangular positioning keys, forming a positioning keyway. 8. The flangeless connection method of the cylindrical tower of a large-scale wind turbine according to claim 2, characterized in that, a ring-shaped rib plate is welded at a certain distance above the matching taper surface of the upper connecting section, and the A ring-shaped reinforcing rib plate is welded at a certain distance below the matching taper surface of the lower connecting section. 9. The non-flange connection method of the cylindrical tower of a large-scale wind turbine according to claim 8, characterized in that, the two annular stiffener plates are evenly drilled with circular holes of a certain diameter on a certain diameter, The number of circular holes is one-third of the number of bolts in one circle.

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