KR102674059B1 - Elevating Frame Device of Self-Elevating Crane - Google Patents

Abstract

This invention is a crane for the installation and maintenance of a wind power generation system provided on the tower and the top of the tower. It is placed on the tower and forms a lifting unit that is arranged to go up and down along the tower, and is arranged to surround the tower to support frictional force on the tower. It relates to a lifting frame device that can be changed into a fixed state and a released state for lifting. The lifting frame device of this invention extends in the horizontal direction and is connected to each other with the tower at the center to form one frame and is disconnected from each other. A plurality of frame portions detachable from the tower, each frame portion comprising a first coupling element that engages each other horizontally and a second coupling element that engages each other vertically at a joint where they are coupled to each other, the first and second coupling elements comprising: The frame portions are aligned with each other by engaging the engaging elements, each frame portion further comprising a third engaging element having an engaging hole aligned with each other by the alignment of the first and second engaging elements, and penetrating the engaging hole. They are joined together by coupling pins.

Description

Elevating Frame Device of Self-Elevating Crane}

This invention relates to a lifting frame device for a self-elevating crane that magnetically raises and lowers a tower for the installation and maintenance of a wind power generation system. Specifically, it forms a lifting unit that lifts and lowers along a tower installed vertically on land. It relates to a lifting frame device that surrounds and is installed.

In a wind power generation system installed on land, a tower is installed vertically from the ground, a nacelle where a wind turbine is placed is provided at the top of the tower, and blades are coupled to the turbine.

For efficient wind power generation, the height of towers is increasing and blades and wind turbines are becoming larger, and crane equipment for installing wind power generation systems is also becoming taller and larger.

Due to limited supply of large cranes, it is difficult to use them for the construction or maintenance of wind tower systems in a timely manner. In particular, wind power generation systems are often installed in mountainous areas, but it is difficult to transport large, high-rise cranes to mountainous areas and work with large cranes is not easy because sufficient work space is not secured on site.

As a solution to this problem, so-called self-elevating crane devices are being developed.

The self-elevating crane device installs a crane on a lifting mechanism that goes up and down along the tower of the wind power generation system. As the lifting mechanism goes up along the tower, the crane lifts the elements that make up the wind power generation system, such as tower units, blades, nacelles, etc., to the installation location. The salvaged or dismantled elements are lowered.

As an invention related to such a magnetic lifting crane device, Chinese Patent Publication CN107265373A (Document 1) discloses an invention titled "Dedicated tool for wind electricity maintenance crane arm structure."

Document 1 The device according to the invention is composed of a plurality of holding arms that surround a tower and are vertically spaced from each other, coupled to a vertically extending cylinder. The holding arms are raised and lowered by cylinders and are attached to the tower alternately with each other to provide support for the lifting movement.

Document 1 The device according to the invention can be used without changing the structure of the tower of the wind power generation system, but since the holding arm lifts and lowers depending on the force holding the tower and the crane must support the load for lifting work, the holding arm must support the load for lifting. The structure of the arm is complex, the lifting and lowering operation is complex and time consuming, assembling and disassembling the holding arm at the work site takes a lot of time, and the safety of the holding arm is a problem.

In addition, in the crane device of the invention in Document 1, the crane unit is attached to one side of the unit that raises and lowers the tower, so the load of the lifting unit and crane unit and the load of the article lifted by the crane are all concentrated on one side of the tower, causing significant eccentricity in the tower. There is a problem with applying load.

As an invention that solves this problem, the "self-elevating type for installation and maintenance of wind power generation system" disclosed in Korean Patent Publication No. 10-2022-0146781 (Document 2), developed and patented by the applicant of this application There is an invention called “crane device”.

The crane device according to the invention in Document 2 includes a lifting unit attached to the tower and provided to lift up and down along the tower, and a crane unit configured to lift the elements constituting the wind tower system and disposed on the upper part of the lifting unit. The lifting unit is configured to surround the tower, and extends between the upper and lower bases and the upper and lower bases, which are variable in a state of being fixedly supported at an arbitrary position of the tower and a state of being able to raise and lower with respect to the tower, so that the upper and lower bases are connected to each other. A plurality of posts that are fixed to each other at vertically spaced positions, configured to surround the tower, are variable in a state of being fixedly supported at an arbitrary position on the tower and a state of being able to be raised and lowered with respect to the tower, and along the posts between the upper and lower bases. It is configured to include a lifting base that can be raised and lowered, and a drive mechanism that is disposed between the lifting base and the upper base or lower base and changes the distance between the lifting base and the upper and lower bases by changing the length.

In the crane device according to the invention in Document 2, the frame is installed to surround the tower and is fixed to the tower by friction force, etc., so that it is configured to support its own weight and the force applied when lifting the item by the crane, so it must have sufficient strength and rigidity. .

The crane is not permanently installed and used on the tower of the wind power generation system, but must be installed on site for installation or maintenance of the wind power generation system, and then dismantled and transported to another location after completion of construction or maintenance.

Accordingly, in the embodiment of Document 2, the frame is configured to be divided into two parts and joined so that the hole through which the tower passes is opened in a semicircular shape.

The frame of a self-elevating crane must have sufficient strength and rigidity to support the pressing force that generates friction to be maintained on the tower, its own weight, and the force applied when lifting goods by the crane, so the connection parts of the frame parts must be sufficient. It must have strength and rigidity, and especially must have binding force for all six degrees of freedom.

In addition, self-elevating cranes must be transported from the site where the tower is installed and assembled and installed on site. In particular, the frame must be installed to surround the tower, so the frame parts must be connected to each other while placed directly on the tower, so it must be installed on site. Alignment and joining of frame parts must be possible easily and quickly.

The traditional method of connecting two frame parts is to attach a connecting plate to the flange and web of the section steel that makes up the frame, and then bolt the connecting plate and flange or web to connect the frame structure to each other.

However, in this method, the positions of the holes for fastening the bolts must be precisely aligned with each other, but in the frame of a very large self-elevating crane, it is very difficult and time-consuming to align the frame parts so that the positions of the holes are aligned with each other. am.

In addition, the work of lifting the frame part at a tower installation site, placing it against the tower, inserting bolts into the holes, and tightening the nuts is very time-consuming.

Another method of connecting two frame parts is to overlap the parts that face each other in the frame parts and connect the overlapping parts by passing a plurality of pins through them.

However, this method, like the bolt fastening method, is very difficult to machine holes with high precision so that the position and size of the hole where the pin is inserted in a large structure are aligned, and the use of such equipment is not easy.

Furthermore, the process of lifting the frame portion and aligning the frame portion against the tower so that the holes are aligned with each other and inserting the pin is a very difficult and time-consuming process.

Document 1: Chinese Patent Publication CN107265373A Document 2: Korean Patent Publication No. 10-2022-0146781

This invention is intended to provide a lifting frame device that forms a lifting unit in a self-elevating crane for installation and maintenance of wind power generation systems.

Specifically, this invention seeks to provide a lifting frame device in which frame parts formed separately from each other can be easily coupled and separated from each other at a site where a wind power generation system is installed.

In particular, the present invention is intended to provide a lifting frame device with a structure in which the frame parts can be easily aligned with each other and the coupling parts can have high strength and rigidity even if the frame parts are not prepared with high processing precision.

The problem to be solved by this invention described above is that the crane for installation and maintenance of the wind power generation system provided on the tower and the top of the tower forms a lifting unit that is placed on the tower and is arranged to raise and lower along the tower, and surrounds the tower. This is achieved by the lifting frame device according to the present invention, which is arranged to change the fixed state in which friction force is supported on the tower and the released state for lifting.

The lifting frame device of this invention is,

It includes a plurality of frame parts that extend in the horizontal direction and are coupled to each other with the tower at the center to form a single frame, and are uncoupled from each other and separable from the tower,

Each frame portion includes first coupling elements that engage each other horizontally and second coupling elements that engage each other vertically at the joint where they are coupled to each other, and the frame portions are aligned with each other by the engagement of the first and second coupling elements. ,

Each frame portion further includes a third coupling element having a coupling hole that is aligned with each other by the alignment of the first and second coupling elements, and is coupled to each other by a coupling pin penetrating the coupling hole.

The lifting frame device of this invention is formed by dividing one frame into a plurality of frame parts, and must be placed directly on the tower at the location where the wind power generation system is installed or at the location where the wind power generation system is installed, and arranged to surround the tower and combined with each other.

Therefore, each frame part must be placed in position on the tower and aligned and joined together.

In the lifting frame device according to this invention, the frame parts are aligned horizontally and vertically with each other by engaging the first and second coupling elements, and in the aligned state, are coupled to each other with pins by the third coupling element to form a frame.

Accordingly, since the coupling between frame elements by the coupling pin is performed after the first and second coupling elements are aligned, the task of inserting the coupling pin by aligning the coupling holes with each other is easily performed.

Additionally, in the lifting frame device of this invention,

The first engaging element of one frame part includes a semicircular protrusion extending in a vertical direction, and the first engaging element of the other frame part includes a semicircular groove extending in a vertical direction, so that the protrusion of both frame parts includes a semicircular groove extending in a vertical direction. The and grooves engage so that the two frame parts are aligned with each other in the horizontal direction.

According to this configuration, the two frame parts that are to be joined to each other are aligned horizontally by the engagement of the semicircular protrusions and grooves. Since the protrusions and grooves are semicircular with self-aligning characteristics, they can be aligned with each other without special precision work, making horizontal alignment between frame parts very easy. Additionally, the construction of the coupling elements for alignment is very simple and inexpensive.

As an additional characteristic configuration of this invention, in the lifting frame device of this invention,

The second coupling element of one frame part includes an alignment surface extending in the horizontal direction and forming an upper surface, and the second coupling element of the other frame part includes an alignment surface extending in the horizontal direction and forming a lower surface,

The alignment surfaces of both frame parts are provided at the same vertical position, and the alignment surface of one frame part is placed on the alignment surface of the other frame part, so that the two frame parts are aligned with each other in the vertical direction.

According to this configuration, the two frame parts to be joined to each other are vertically aligned simply by placing the alignment surface of one alignment element on the alignment surface of the other alignment element.

Therefore, vertical alignment between frame parts is easily accomplished without any special precision work. The construction of coupling elements for such alignment is very simple and inexpensive.

As a further characteristic feature of this invention, in the lifting frame device of this invention,

The third coupling element includes an alignment surface that abuts each other by aligning the first and second coupling elements, and a coupling hole passes through the alignment surface and is provided in a direction perpendicular to the direction in which the frame portions are separated from each other.

A very high level of alignment is required to join the elements that must be joined together with pins, but in huge devices such as cranes used in wind power generation systems, alignment to join frames with pins is very difficult and in practice, the alignment of the pins is difficult. Precision processing is impossible.

However, according to the above-described additional characteristic configuration of this invention, in a state where the first and second coupling elements are aligned in the vertical and horizontal directions, one joint is joined only by one pin coupling, so that the pin coupling is possible. Matching is accomplished in a very simple and inexpensive manner.

Figure 1 is a front view showing a state in which a crane equipped with a lifting frame device according to an embodiment of the present invention is installed on a tower.
Figure 2 is a perspective view of a lifting unit equipped with a lifting frame device according to an embodiment of the present invention.
Figure 3 is a plan view of the lower frame seen along line AA in Figure 2;
FIG. 4 is a conceptual plan view of portion B of FIG. 3.
Figure 5 is a diagram conceptually showing the joint of Figure 4.
FIG. 6 is a diagram conceptually showing the joint of FIG. 4.

Hereinafter, as specific details for carrying out the present invention with reference to the drawings, the configuration of the lifting frame device according to one embodiment of the present invention and the schematic configuration and operation of the crane and the lifting unit equipped with the lifting frame device will be described. .

Unless otherwise defined in the description below and throughout this specification, 'radial direction', 'vertical direction' and 'circumferential direction' all mean the diametrical, vertical and circumferential directions of the tower with respect to the tower 1. .

First, with reference to FIGS. 1 to 3, a schematic configuration of a crane equipped with a lifting frame device according to an embodiment will be described.

The crane of this embodiment is according to the invention in Document 2, and includes a lifting unit 100 attached to the tower 1 of the wind power generation system and configured to be vertically raised and lowered along the tower, and two crane units disposed on the upper part of the lifting unit. It consists of (200).

According to this configuration, for example, when the lifting unit 100 ascends along the tower 1 with the crane unit 200 mounted and reaches the working position, the crane unit 200 is placed on the ground with the lifting hook 201. Lifting elements of the wind power generation system, such as placed tower units, nacelles or blades. As another method, a lifting unit such as that disclosed in Document 1 is installed on the lifting hook 201, and the elements of the system are lifted to the installation site by the lifting unit.

The lifting unit 100 is configured to surround the tower 1 and includes an upper frame 110, first and second intermediate frames that are variable in a state fixed and supported at an arbitrary position of the tower and a state capable of being raised and lowered with respect to the tower. (130, 140) and the lower frame 120 are provided sequentially from top to bottom.

The upper frame 110, the first and second intermediate frames 130 and 140, and the lower frame 120 all form a rectangular shape extending in a plane perpendicular to the vertical direction in which the tower 1 extends, and have an inner center Holes 111, 121, 131, and 141 through which the tower 1 passes are formed to surround the tower 1.

The upper frame 110 and the lower frame 120 are arranged in a vertical direction and are fixed to each other by a post 160 penetrating the first and second intermediate frames 130 and 140 and are raised and lowered together. The intermediate frames 130 and 140 are also fixed by posts 170 extending in the vertical direction and are lifted together, and a hydraulic cylinder 150 for lifting is provided between the upper frame 110 and the first intermediate frame 130. .

According to this configuration, the lifting hydraulic cylinder 150 is expanded and contracted while the upper and lower frames 110 and 120 are fixed and supported on the tower 1, so that the first and second intermediate frames 130 and 140 are connected to the tower 1. It goes up and down along, and while the first and second intermediate frames 130 and 140 are fixed and supported on the tower 1, the hydraulic cylinder 150 for lifting and lowering expands and contracts, so that the upper and lower intermediate frames 110 and 120 move to the tower 1. ) goes up and down. By repeating these operations, the lifting unit 100 goes up and down along the tower, causing the entire crane to go up and down.

Figure 3 shows a plan view of the lower frame 120 as one of the lifting frame devices according to this embodiment. The upper frame 110 and the first and second intermediate frames 130 and 140 are also included in the lower frame 120. Likewise, it has the configuration described below. Therefore, hereinafter, only the configuration and operation of the lower frame 120 as one of the lifting frame devices according to this embodiment will be described.

In the lower frame 120, eight fixing devices 300 are arranged centered on the hole 121 through which the tower 1 is placed.

The fixing devices 300 are spaced apart from each other at equal intervals in the circumferential direction, and are provided with a friction pad mechanism 310 on the surface facing the surface of the tower 1, and the friction pad mechanism 310 is brought into close contact with the tower surface. It is equipped with first and second hydraulic cylinders 320 and 330 as a driving mechanism for pressurizing.

A wire 180 is disposed on the lower frame 120 to surround the friction pad mechanisms 310 of the eight fixing devices 300 from the radial outer side. Both ends of the wire 180 may be pulled by a winch mechanism (not shown) so that the wire presses the friction pad mechanism 310 radially inward.

By pulling the wire 180 while the lower frame 120 is fixed at an arbitrary position on the tower, the friction pad mechanism 310 can maintain a state of being pressed against the tower, preventing failure of the first hydraulic cylinder 320 or Despite leakage, the friction pad mechanism 310 is not pressed against the tower, thereby preventing it from falling.

When the lower frame 120 is raised and lowered, the tensile force applied to the wire 180 is removed, so that the friction pad mechanism 10 is not restrained by the wire.

The lower frame 120 is divided into two first and second frame parts 10 and 20 that are symmetrical to each other, and are joined to each other at two joints indicated as 'B' in FIG. It forms a frame device.

Figure 4 is a plan view conceptually showing the configuration of such a joint. Figure 4 shows the state before the first and second frame parts 10 and 20 are coupled to each other.

The first and second frame parts (10, 20) have three horizontal channels (11, 12, 13, 21, 22, 23) extending in parallel at the joint (B), and the ends of the horizontal channels are orthogonal channels. They are connected to each other in the diametric direction by (14, 24).

In the orthogonal channels 14 and 24, three first to third joints 31, 32, and 33 are formed at radial positions corresponding to the positions of the horizontal channels.

The radially outermost first joint 31 and the innermost third joint 33 have the same coupling configuration, and the middle second joint 32 has a different coupling configuration. .

First, the configuration of the radially outermost first joint portion 31 will be described with reference to FIG. 5 .

In FIG. 5, (a) shows a front view before the first and second frame parts 10 and 20 are combined with each other, and (b) shows the first and second frame parts 10 and 20 combined with each other. shows a front view, and (c) shows a top view of the first and second frame parts 10 and 20 coupled to each other.

In the first joint 31, coupling blocks 15 and 25 in which semi-cylindrical grooves 151 are machined in the vertical direction are respectively coupled to orthogonal channels 14 and 24 by welding. In the orthogonal channel 24 of the second frame portion 20, an alignment pin 26 extending cylindrically in the vertical direction and having a head 261 with a wide diameter on the upper side is inserted into the groove 251 of the coupling block 25. and welded.

The diameter of the pin 26 is the same as the diameter of the groove 251 of the coupling block 15, so that the portion of the pin 26 with a semicircular cross section protruding from the coupling block 25 is the groove 251 of the coupling block 15. ) is inserted into and matched.

Accordingly, when the coupling block 15 of the first frame portion and the coupling block 25 of the second frame portion face each other, half of the pin 26 is inserted into the groove 151 and matched, so that both coupling blocks 15 , 25) are engaged with each other, and the first and second frame parts 10, 20 are aligned with each other in the horizontal direction (X and Y directions).

The head 261 of the pin 26 is placed on the upper surface of the coupling blocks 15 and 25 on both sides. Therefore, when the pin 26 is coupled to the coupling block 25 by welding, the pin 26 guides the position, and when the coupling blocks 15 and 25 are engaged with each other, the pin 26 is coupled to the head 261 of the pin. It comes into contact with the upper surface of the block 15 and ensures that the combined block is aligned in the vertical direction (Z).

The configuration and operation of the third joint 33 are the same as those of the first joint 31, so description is omitted.

The structure and operation of the second joint 32 will be described with reference to FIG. 6 .

In FIG. 6, (a) shows a front view of the first and second frame parts 10 and 20 before they are coupled to each other, and (b) shows a state in which the first and second frame parts 10 and 20 are coupled to each other. Shows the front view of .

In the second joint 32, horizontal coupling blocks 17 and 27 are joined to the orthogonal channels 14 and 24 by welding on surfaces facing each other.

The horizontal coupling block 17 of the first frame portion 10 is coupled to the lower part of the orthogonal channel 14 by welding, and the upper surface 171 is processed to be flat. The horizontal coupling block 27 of the second frame portion 20 is coupled to the upper part of the orthogonal channel 24 by welding, and the lower end surface 271 is processed to be flat.

The upper surface 171 of the horizontal coupling block 17 and the lower surface 271 of the horizontal coupling block 27 are provided at the same height in the vertical direction (Z direction), and the lower surface of the horizontal coupling block 27 ( When the upper surface 171 of the horizontal coupling block 17 is placed on 271, the first frame part 10 and the second frame part 20 are aligned at the same vertical position.

Pin blocks 18 and 28 are disposed on the upper surfaces of the orthogonal channels 14 and 24, respectively, joined by welding.

The pin blocks 18 and 28 are provided in a position where their sides come into contact with each other and overlap when the first and second frame parts 10 and 20 are joined together, and the holes 181 and 281 passing through them are vertical and horizontal. Among the directions, the positions are aligned in the direction in which the horizontal channels 12 and 22 extend (X direction).

Accordingly, when the first and second frame parts 10 and 20 are aligned and arranged with each other to couple them, the holes 181 and 281 of the pin blocks 18 and 28 are aligned with each other and are provided with coupling pins ( 19) can be inserted.

According to the above configuration, the pin 26 of the coupling block 25 is inserted into the groove 151 of the coupling block 15 at the first and third joints 31 and 33, and the pin 26 of the coupling block 25 is inserted into the groove 151 of the coupling block 15 at the first and third joints 31 and 33. When the horizontal coupling block 27 of the second frame part is placed on the horizontal coupling block 17 of the first frame part, the first frame part 10 and the second frame part 20 are aligned in the vertical direction (Z direction) and the horizontal direction. They are all aligned with each other (in the XY direction).

Accordingly, the holes 181 and 281 of the pin blocks 18 and 28 are aligned with each other, allowing the pin 26 to be inserted there.

When the pins 26 are inserted into the holes 181 and 281 of the pin blocks 18 and 28, the first frame is The portion 10 and the second frame portion 20 are inseparably coupled to each other.

As described above, in the lower frame 120 of this embodiment, the first and second frame parts 10 and 20 are formed by simply touching the coupling blocks 15 and 25 and the horizontal coupling blocks 17 and 27 against each other. The first and second frame parts (10, 20) are aligned with each other in all directions, and the holes (171, 281) of the pin blocks (18, 28) are also aligned, so that simply inserting the coupling pin (19) into these holes The first and second frame parts 10 and 20 are coupled to each other to form the lower frame 120.

With the first and second frame parts 10 and 20 placed on the tower 1, the above alignment and joining process is performed to place the lower frame 120 on the tower 1.

Above, the configuration and operation of the two parts forming the lower frame 120 are aligned and combined have been described, but the upper frame 110 and the first and second intermediate frames 130 and 140 are also joints of the two frame parts. is constructed, aligned and joined in the same way as the lower frame.

Above, the configuration and operation of the lifting frame device of the self-elevating crane according to this invention have been described. This invention is not limited to these embodiments, and various modifications, variations, and additions of components are possible within the scope set forth in the claims, and the lifting frame device to which such various modifications, modifications, and components are added is the present invention. falls within the scope of

1: Tower 100: Elevating unit
110: upper frame 120: lower frame
130: first middle frame 140: second middle frame
300: Fixing device 10: First frame portion
20: Second frame portion

Claims (4)

delete In a crane for installation and maintenance of a wind power generation system provided on the tower and on top of the tower, it is placed on the tower and forms a lifting unit arranged to go up and down along the tower. It is arranged to surround the tower and is fixed to support frictional force on the tower. A lifting frame device that can be changed into a released state for lifting and lowering,
It includes a plurality of frame parts that extend in the horizontal direction and are coupled to each other with the tower at the center to form a single frame, and are uncoupled from each other and separable from the tower,
Each frame portion includes first coupling elements that engage each other horizontally and second coupling elements that engage each other vertically at the joint where they are coupled to each other, and the frame portions are aligned with each other by the engagement of the first and second coupling elements. ,
Each frame portion further includes a third coupling element having a coupling hole that is aligned with each other by the alignment of the first and second coupling elements, and is coupled to each other by a coupling pin penetrating the coupling hole,
The first engaging element of one frame part includes a semicircular protrusion extending in a vertical direction, and the first engaging element of the other frame part includes a semicircular groove extending in a vertical direction, so that the protrusion of both frame parts includes a semicircular groove extending in a vertical direction. A lifting frame device in which the two frame parts are aligned with each other in the horizontal direction by engaging the and grooves. In claim 2,
The second coupling element of one frame part includes an alignment surface extending in the horizontal direction and forming an upper surface, and the second coupling element of the other frame part includes an alignment surface extending in the horizontal direction and forming a lower surface,
The alignment surfaces of both frame parts are provided at the same vertical position, and the alignment surface of one frame part is placed on the alignment surface of the other frame part, so that the two frame parts are aligned with each other in the vertical direction. Device. In claim 2,
The third coupling element includes an alignment surface that abuts each other by aligning the first and second coupling elements, and the coupling hole passes through the alignment surface and is provided in a direction perpendicular to the direction in which the frame parts are separated from each other. Framing device.