KR20130053236A

KR20130053236A - Crane

Info

Publication number: KR20130053236A
Application number: KR1020110118900A
Authority: KR
Inventors: 이재학
Original assignee: 삼성중공업 주식회사
Priority date: 2011-11-15
Filing date: 2011-11-15
Publication date: 2013-05-23

Abstract

The crane is disclosed. Crane according to an embodiment of the present invention the body; A boom which is installed to be inclined upward on the body and is rotatable to adjust an inclination angle; An upper sieve assembly installed at an upper end of the boom and having upper sieves rotatable about the same axis; A lower sieve assembly positioned below the upper sieve assembly and having lower sieves rotatable about the same axis; Side sheave assemblies positioned on both sides of the upper sheave assembly and having side sheaves whose direction of rotation is changeable; And wound on the lower sieve positioned at the outermost side through any one of the side sieves, alternately and repeatedly wound on the lower sieves and the upper sieves, and then provided to the other visualized sieve. It includes a wire.

Description

Crane {CRANE}

The present invention relates to a crane.

A marine crane is a device for lifting and carrying an object in a floating state at sea. The marine crane has a boom installed in the body of the crane as described in Korean Patent Laid-Open Publication No. 10-2009-11697, and the wire wound on the rotatable sheave lifts the cargo.

The crane uses two booms to lift the load, and when lifting a load larger or smaller than the boom spacing, the wires are not straight in the vertical direction but are inclined in the transverse direction. If the angle of inclination of the wire with respect to the vertical direction is out of the allowable angle, there is a risk that the wire derails from the sheave.

Japanese Laid-Open Patent No. 2002-60182 Korean Laid-Open Patent Publication No. 2006-70756

Embodiments of the present invention provide a crane that can prevent derailment of the wire.

According to one aspect of the invention, the crane body; A boom which is installed to be inclined upward on the body and is rotatable to adjust an inclination angle; An upper sieve assembly installed at an upper end of the boom and having upper sieves rotatable about the same axis; A lower sieve assembly positioned below the upper sieve assembly and having lower sieves rotatable about the same axis; Side sheave assemblies positioned on both sides of the upper sieve assembly and having side sheaves whose rotation axis directions are changeable; And wound on the lower sieve positioned at the outermost side through any one of the side sieves, alternately and repeatedly wound on the lower sieves and the upper sieves, and then provided to the other visualized sieve. It includes a wire.

The side sheave assembly may further include: a support shaft fixed to the top of the boom in a first direction; A casing installed on the support shaft so as to be rotatable about the support shaft, the casing having an inner space formed therein, wherein the side sheave is located inside the casing and is rotatable about a second direction axis perpendicular to the first direction. Can be.

In addition, the casing may include a first front wall having a first opening; And a second rear wall spaced apart from the first side wall along the first direction and having a second opening, wherein the wire passes through the first opening, the top of the side sheave, and the second opening in sequence. The lower sheave may be wound.

The upper sieve assembly may include an upper casing having a space in which the upper sieves are located; An upper support shaft installed inside the upper casing and providing an axis through which the upper sheaves rotate; And an upper connection block connecting the upper end of the boom and the upper casing, wherein the upper connection block may be connected to the upper end of the boom so as to be rotatable about an axis disposed in a direction perpendicular to the upper support shaft.

In embodiments of the present invention, since the sheave moves along with the movement of the wire, derailment of the wire can be prevented.

In addition, the embodiments of the present invention because the sheave moves in the same direction as the direction of the force acting on the wire, the sheave and the wire can withstand high loads.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a view showing a crane according to an embodiment of the present invention.
FIG. 2 is a view showing the top of the boom of FIG. 1.
3 is a side view illustrating the top of the boom of FIG. 1.
4 is a front view illustrating the side sheave assembly of FIG. 3.
FIG. 5 is a side cross-sectional view illustrating the side sheave assembly of FIG. 4. FIG.
6 is a view showing a part of a crane on which an object is suspended.

Hereinafter, a crane according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view showing a crane according to an embodiment of the present invention. Referring to FIG. 1, the crane 10 may include a marine crane that performs work in a floating state in the ocean S. The body 20 of the crane 10 is provided as a hull floatable in the ocean (S). The hull 20 can be moved to a position to install the cargo using a winch installed on the upper portion of the vessel, it can move a long distance in the state of winding the cargo using a tug boat. The support tower 30 is installed above the hull 20. The support tower 30 is located adjacent to the stern. The support tower 30 includes at least two towers 31 and 32 arranged to intersect each other on the hull 20. Each tower (31, 32) is the lower end is fixedly installed on the upper surface of the hull 20, the upper end is connected to each other.

The hoisting winch 40 is installed below the area where the towers 31 and 32 intersect. The hoisting winch 40 has a drum shape and is rotatably installed on the upper surface of the hull 20. Hoisting winch 40 winds and unwinds wire 50.

First guide sheaves 61 are installed at the upper ends of the towers 31 and 32. The first guide sheave 61 supports the wire 50 wound around the hoisting winch 40. In addition, the first guide sheave 61 switches a direction in which the wire 50 is provided.

The bow of the hull 20 is provided with a boom 70. The boom 70 may be provided in a truss structure in which a plurality of rods 71 intersect each other along a longitudinal direction thereof. The boom 70 is disposed to be inclined upward on the top of the hull 20. The lower end of the boom 70 is pivoted to the upper surface of the hull 20 (pivot, 72). The upper end of the boom 70 is connected with the support tower 30 through the support wire 80. The support wire 80 may be provided in multiple lines and bears the boom 70. The support wire 80 adjusts the inclination angle of the boom 70. The boom 70 is rotatable about the pivot 72. By the rotation of the boom 70, the inclination angle of the boom 70 with respect to the upper surface of the hull 20 can be changed. A second guide sheave 62 may be installed in the central region of the boom 70 along the longitudinal direction of the boom 70. The second guide sheave 62 supports the wire 50 provided through the first guide sheave 61. The wire 50 supported by the second guide sheave 62 is changed in direction and provided to the upper end of the boom 70 along the longitudinal direction of the boom 70. The third guide sheave 63 may be installed at an upper end of the boom 70. The third guide sheave 63 supports the wire 50. The wire 50 supported by the third guide sheave 63 is changed in direction and provided to the end of the boom 70.

FIG. 2 is a front view illustrating the boom top of FIG. 1, and FIG. 3 is a side view illustrating the boom top of FIG. 1.

2 and 3, the upper sheave assembly 100 is coupled to the upper end of the boom 70. The upper sheave assembly 100 includes an upper connection block 110, an upper casing 120, an upper support shaft 130, and an upper sheave 140.

The upper connection block 110 is the upper end of the pivot 111 is coupled to the upper end of the boom (70). Around the upper end of the upper connection block 110, the lower end is rotatable back and forth, and in the left and right directions. The lower end of the upper connection block 110 is bifurcated. The upper casing 120 is coupled to the branched area. The upper casing 120 has an inner space with a bottom open. The upper support shaft 130 is fixed to both sidewalls of the upper casing 120. The upper support shaft 130 is disposed perpendicular to the axis direction in which the upper end of the upper connection block 110 rotates. The upper sheaves 140 are inserted into the upper support shaft 130. The upper sheaves 140 are sequentially inserted along the longitudinal direction of the upper support shaft 130. The upper sheaves 140 may be connected to a bearing (not shown) to be rotatable with respect to the upper support shaft 130. The wire 50 is wound around the groove formed on the outer circumferential surface of the upper sheave 140.

The lower sieve assembly 200 is positioned below the upper sieve assembly 100. Lower sieve assembly 200 is suspended from upper sieve assembly 100 by wire 50. The spacing between the upper sheave assembly 100 and the lower sheave assembly 200 may vary depending on the length of the wire 50 provided between the upper sheave assembly 100 and the lower sheave assembly 200. The lower sheave assembly 200 includes a lower casing 210, a lower support shaft 220, and a lower sheave 230. The lower casing 210 has a space having an open upper surface therein. The lower support shaft 220 is fixedly installed in the lower casing 210. The lower support shaft 220 is disposed in parallel with the upper support shaft 130. Lower sheaves 230 are inserted into the lower support shaft 220. The lower sheaves 230 are sequentially inserted along the longitudinal direction of the lower support shaft 220. The lower sheaves 230 may be connected to a bearing (not shown) so as to be rotatable about the lower support shaft 220. The wire 50 is wound around the groove formed on the outer circumferential surface of the lower sheave 230.

The hook assembly 300 is connected to the lower end of the lower sheave assembly 200. The hook assembly 300 includes a hook block 310 and a hook 320. The hook block 310 is provided as a generally rectangular block and is connected to the lower end of the lower casing 210. Hooks 320 are connected to the bottom of the hook block 310. The hook 320 is pivoted to the hook block 310 and can be rotated back, front, and left and right. The rotatable direction of the hook 320 is the same as the rotatable direction of the upper connection block 110. The object to be transferred is suspended on the hook 320. The object may be suspended directly on the hook 320 or indirectly through a wire or a chain.

Side sieve assemblies 400a and 400b are positioned at both sides of the upper sieve assembly 100, respectively. The side sheave assemblies 400a and 400b change the providing direction of the wire 50 so that the wire 50 is provided to the lower sheave assembly 200.

4 is a front view illustrating the side sheave assembly of FIG. 3, and FIG. 5 is a side cross-sectional view illustrating the side sheave assembly of FIG. 4. 4 and 5, the side sheave assemblies 400a and 400b include a support shaft 410, a casing 420, a sheave rotation shaft 430, and a side sheave 440.

The support shaft 410 is disposed in the first direction X, and both ends thereof are rotatably installed on the guide plates 73 and 74. The guide plates 73 and 74 are spaced apart from each other and fixedly installed at the upper end of the boom (70 in FIG. 1). The casing 420 has a space in which the bottom surface is opened. The casing has a first front wall 421 and a second rear wall 422. The first front wall 421 and the second rear wall 422 are spaced apart from each other along the first direction (X). A first opening 421a is formed in the first front wall 421. A second opening 422a is formed in the second rear wall 422. The first opening 421a and the second opening 422a may be formed as slit holes formed to extend in the vertical direction Z. The sieve rotation shaft 430 is disposed in a second direction Y perpendicular to the first direction X when viewed from the top, and both ends thereof have a first side wall 423 and a second side wall (423) of the casing 420, respectively. The side sheave 440 is positioned inside the casing 420, and a lower end thereof is positioned below the casing 420 to be exposed to the outside. The side sheave 440 has a central region inserted into the sheave axis of rotation 430. The side sheave 440 and the sheave axis of rotation 430 are connected by a bearing 450. The inner ring 451 of the bearing is fixedly inserted into the sheave rotational shaft 430, and the outflow 452 is fixedly inserted into the center region of the side sheave 440. By means of a bearing ball 453 located between the inner ring 451 and the outer ring 452, the side sheave 440 is rotatable about the sheave axis of rotation 430. The wire 50 is sequentially provided to the first opening 421a, the groove 441 of the side sheave 440, and the second opening 422a. The wire 50 passing through the second opening 442a is provided in the lower sheave 230a positioned at the outermost side as shown in FIG. 2. A wire 50 is provided from the side sheave 440a located on one side of the upper sheave assembly 100 to the lower sheave 230a. The wire 50 is wound alternately and repeatedly between the lower sheaves 230 and the upper sheave 140. Then, the wire 50 is provided to the side sheave 440b located on the other side of the upper sheave assembly 100 from the lower sheave 230b positioned at the outermost side. Wire 50 is wound to hoisting winch 40 in FIG. 1 via side sheave 440b.

6 is a view showing a part of a crane on which an object is suspended. Referring to FIG. 6, when the object M is hoisted on the hook 320, the upper and lower sheave assemblies 100 and 200 naturally move in the direction of movement of the object M. Referring to FIG. In this movement, the lower sheave assembly 200 and the wire 50 are inclined with respect to the vertical direction. The lateral movement of the wire 50 due to the object M may cause derailment of the wire 50 wound on the upper sheave 140 or the side sheaves 440a and 440b. Rotating wire 50 when the wires 50 move in the transverse direction while the upper sheave 140 and the side sheaves 440a and 440b are fixed, for example, when the movement moves at an angle of 5 ° or more with respect to the vertical direction. May be derailed from a groove formed in the upper sheave 140 or the side sheaves 440a and 440b. According to the present invention, since the upper sheave assembly 100 rotates a predetermined angle with respect to the boom 70 in accordance with the lateral movement of the wire 50, the derailment of the wire 50 from the upper sheave 140 is prevented and the load is prevented. Since the upper sieve assembly 100 moves in the received direction, the devices can receive advantageous forces in the same direction. In addition, since the side sheaves 440a and 440b rotate by a predetermined angle about the sheave rotational axis 410 in accordance with the lateral movement of the wire 50, the wire 50 derails from the side sheaves 440a and 440b. It can be prevented.

In the above-described embodiment, a marine crane has been described as an example, but the technical idea of the present invention is not limited thereto and may be applied to various cranes in which a boom such as a crane performing work on land is installed.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

10: crane 20: body
50: wire 70: boom
100: upper sheave assembly 200: lower sheave assembly
300: hook assembly 400a, 400b: side sheave assembly

Claims

Body;
A boom which is installed to be inclined upward on the body and is rotatable to adjust an inclination angle;
An upper sieve assembly installed at an upper end of the boom and having upper sieves rotatable about the same axis;
A lower sieve assembly positioned below the upper sieve assembly and having lower sieves rotatable about the same axis;
Side sheave assemblies respectively positioned on both sides of the upper sheave assembly and having side sheaves with a rotatable shaft; And
After winding one of the side sheaves to the outer side of the lower sieve, and alternately and repeatedly wound the lower sheaves and the upper sheaves, the wire provided to the other side sheave Including crane.

The method of claim 1,
The side sheave assembly
A support shaft fixed to the top of the boom in a first direction;
The casing is installed on the support shaft to be rotatable about the support shaft, the inner space further comprises a casing,
And the side sheave is located within the casing and is rotatable about a second direction axis perpendicular to the first direction.

3. The method of claim 2,
The casing
A first front wall on which a first opening is formed; And
A second rear wall spaced apart from the first front wall along the first direction and having a second opening;
The wire is wound around the lower sheave through the first opening, the upper end of the side sheave, and the second opening.

4. The method according to any one of claims 1 to 3,
The upper sheave assembly
An upper casing having a space in which the upper sieves are located;
An upper support shaft installed inside the upper casing and providing an axis through which the upper sheaves rotate; And
Further comprising a top connection block for connecting the upper casing and the upper casing of the boom,
The upper connecting block is connected to the top of the boom so as to be rotatable about an axis disposed in a direction perpendicular to the upper support shaft.