WO2013005978A2

WO2013005978A2 - Device for driving crane boom assembly

Info

Publication number: WO2013005978A2
Application number: PCT/KR2012/005292
Authority: WO
Inventors: 이영재; 정인권
Original assignee: 동양기전 주식회사
Priority date: 2011-07-06
Filing date: 2012-07-04
Publication date: 2013-01-10
Also published as: WO2013005978A3; KR20130005470A

Abstract

The present invention relates to a device for driving a crane boom assembly. Said device for driving a crane boom assembly has a main boom, a plurality of inserting and withdrawing booms combined inside said main boom to insert and withdraw, a cylinder device for allowing some of said inserting and withdrawing booms to insert and withdraw, wires for allowing the rest of said inserting and withdrawing booms to be operated, and pulleys on which said wires are wound, wherein the device for driving a crane boom assembly comprises: a first cylinder which has a first rod that is fixed to said main boom, and a first cylinder body into which said first rod is inserted to emerge therefrom and which is fixed to a inserting and withdrawing boom, in order to allow said first inserting and withdrawing boom to insert and withdraw from said main boom when said first inserting and withdrawing boom to an Nth inserting and withdrawing boom (N is a natural number which of 4 or more) are sequentially inserted into the inside of said main boom; a second cylinder which has a second rod that is fixed to a second inserting and withdrawing boom, and a second cylinder body into which said second rod is inserted to emerge therefrom and which is fixed to a third inserting and withdrawing boom, in order to operate simultaneously with said first cylinder body and to allow said third inserting and withdrawing boom to insert and withdraw from said second inserting and withdrawing boom; a first wire having one end that is coupled with said main boom, and the other end that is coupled with said second inserting and withdrawing boom; a first pulley which is installed on said first inserting and withdrawing boom, and guides said first wire by hanging said first wire; a second wire having one end that is coupled with said second inserting and withdrawing boom, and the other end that is coupled with said main boom; and a second pulley which is installed on said first inserting and withdrawing boom, and guides said first wire by hanging said first wire.

Description

Boom Assembly Drive of Crane

The present invention relates to a device for driving a boom assembly of a crane, and in particular, a plurality of booms constituting the boom assembly are simultaneously pulled out or pulled in to shorten working time and reduce fuel usage due to shortening of working time. Relates to a device.

As shown in FIG. 1, a general crane includes an engine driving unit 1, a mounting unit 2, and a crane unit 3. The crane portion 3 is a portion that substantially pulls the load. The crane portion 3 is provided with a boom assembly (4).

Referring to FIG. 2, the boom assembly 4 includes a plurality of

booms

11, 12, 13, 14, 15, and 16

hydraulic cylinders

21, 22, 23,

wires

31, 41, and 50. And withdrawals by the

pulleys

32, 42, 51 and 52.

Specifically, the boom assembly 4 is a hydraulic cylinder (21, 22, up to the first stage boom 11, the second stage boom 12, the third stage boom 13 and the fourth stage boom 14 in consideration of stability). 23 is driven in sequence, and the fifth stage boom 15 and the sixth stage boom 16 are not driven hydraulically in consideration of their own load, but are pulled out rotatably around the

pulleys

32 and 42 for pulling out. It is drawn in and out by the

wires

31 and 41.

The operation process will be described in detail as follows. In the boom assembly 4, the second end boom 12 to the sixth end boom 16 are sequentially inserted into the first end boom 11.

The first cylinder 21 is installed between the first step boom 11 and the second step boom. One end of the first rod 211 of the first cylinder 21 is fixed to the first end boom 11, and the first cylinder body 212 of the first cylinder 21 is connected to the second end boom 12. It is fixed.

The second cylinder 22 is installed between the second step boom 12 and the third step boom 13. One end of the second rod 221 of the second cylinder 22 is fixed to the second end boom 12, and the second cylinder body 222 of the second cylinder 22 is attached to the third end boom 13. It is fixed. The tip portion of the second rod 221 communicates with the tip portion of the first cylinder body 212.

A third cylinder 23 is installed between the third step boom 13 and the fourth step boom 14. One end of the third rod 231 of the third cylinder 23 is fixed to the third end boom 13, and the third cylinder body 223 of the third cylinder 23 is fixed to the fourth end boom 14. do. The tip end of the third rod 23 communicates with the tip end of the second cylinder body 223.

When the hydraulic pressure is applied to the inside of the first cylinder 21, the first rod 211 protrudes from the first cylinder body 212, the first cylinder body 212 moves to the right, the first cylinder body 212 The second step boom 12 is fixedly protruded from the first step boom 11 is drawn out.

At this time, the second cylinder 22 installed between the second step boom 12 and the third step boom 13 is moved in accordance with the withdrawal operation of the second step boom 12, and then the first rod of the first cylinder 21 ( When 211 is completely protruded, the hydraulic pressure is applied to the second cylinder body 222 to start the protruding operation. That is, in the operation of the second cylinder 22, the hydraulic pressure is applied into the first cylinder 21 so that the first rod 211 protrudes, and the first cylinder body 212 moves to move the first rod 211. When the protrusion is completed, the hydraulic pressure introduced into the first cylinder 21 flows into the second cylinder body 222 of the second cylinder 22 through the tip of the second rod 221 of the second cylinder 22. As the second rod 221 of the second cylinder 22 protrudes, the third end boom 13 moves to the right to be withdrawn.

Similarly, the third cylinder 23 installed between the third step boom 13 and the fourth step boom 14 is moved in accordance with the withdrawal operation of the third step boom 13 and then the second rod 221 of the second cylinder 22. At the point where) is completely projected, the projecting operation starts.

In the protruding motion of the third cylinder 23, the hydraulic pressure is applied into the second cylinder 22 so that the second rod 221 protrudes, so that the second cylinder body 222 is moved to the right, and then the second rod 221 At the time when the protrusion of the cylinder is completed, the hydraulic pressure introduced into the second cylinder body 222 flows into the third cylinder body 232 through the tip of the third rod 231 of the third cylinder 23, thereby allowing the third cylinder ( As the third rod 231 of 23 is protruded from the third cylinder body 232, the fourth end boom 14 protrudes to the right and is drawn out.

In this way, the second, third and

fourth stage booms

12, 13 and 14 are protruded by the first, second and

third cylinders

21, 22 and 23.

On the other hand, the 5th step boom 15 and the 6th step boom 16 are pulled out by a wire and a pulley regardless of a cylinder apparatus.

The withdrawal of the fifth step boom 15 is performed as follows. One end of the third end boom 13 and one end of the fifth end boom 15 are connected to the first wire 31 for withdrawal, and the first wire 31 for withdrawal is hooked on the fourth end boom 14. A pull-out first pulley 32 is provided. When the fourth step boom 14 is pulled out by the third cylinder 23, the fifth pull boom 15 is pulled out while the first pulley 32 for pulling out installed in the fourth step boom 14 moves to the right.

The withdrawal of the sixth step boom 16 is performed as follows. One end of the fourth step boom 14 and one end of the sixth step boom 16 are connected to each other by the second wire 41 for pulling out, and the second wire 42 for pulling out hangs on the fifth step boom 15. A pulley second pulley 42 is provided. When the fifth step boom 15 is drawn out as described above, the sixth step boom 16 is drawn out while the second pulley 42 for drawing is moved to the right.

As a result, in the cram boom assembly, the withdrawal operation is performed by the second stage boom 12 starting the withdrawal operation by the first cylinder 21, wherein the third stage boom to the

sixth stage boom

13, 14, 15, 16 Is stationary. Subsequently, when the third step boom 13 starts to be drawn out by the second cylinder 22, the fourth to sixth step booms 14, 15, and 16 are in a stopped state. In addition, when the fourth step boom 14 is drawn out by the third cylinder 23, the fifth step boom 15 and the sixth step boom 16 are simultaneously drawn out.

On the other hand, in the conventional claim boom assembly according to the configuration as described in the sequential pulling process of each boom as follows.

One end of the fourth end boom 14 and one end of the sixth end boom 16 are connected to each other by the wire 50 for the inlet, and the wire for the inlet 50 is installed in the third cylinder 23. It is guided by the 1st pulley 51 and the 2nd pulley 52 for drawing provided in the 2nd cylinder 22. As shown in FIG.

When the first rod 211 of the first cylinder 21 is inserted into the first cylinder body 212, the second step boom 12 to which the first cylinder body 212 is fixed is moved into the first step boom 11. It is pulled in.

At the time when the second step boom 12 is completely inserted into the first step boom 11, the second rod 221 of the second cylinder 22 is operated so that the third step boom 13 moves to the second step boom 12. ) Is drawn inside.

When the third step boom 13 is completely inserted into the second step boom 12, the third rod 231 of the third cylinder 23 starts to insert the fourth step boom 14. This third step boom 13 is inserted into the interior.

At this time, as the third cylinder body 232 of the third cylinder 23 is moved to the left side, the first pulley 51 for pulling installed in the third cylinder body 232 is moved to the left side, so that the citation wire 50 is used. While pulling the sixth step boom (16).

The retracting motion of the third cylinder 23 causes the fifth and

sixth step booms

15 and 16 to be inserted into the fourth and

fifth step booms

14 and 15, respectively, and the pulling wire 50 is pulled to draw the sixth. The step boom 16 is inserted into the fifth step boom 15, and the pulling wire 50 fixed to the fifth step boom 15 is pulled by the insertion operation of the fifth step boom 15. The

fifth pulleys

15 and 16 are inserted into the fourth and

fifth step booms

14 and 15, respectively, while the first pulley 32 for pulling out is pushed back.

As described above, the conventional crane boom assembly sequentially draws out and pulls in the first, second, third and fourth booms by the cylinder device, and thus the time required for drawing and drawing is increased, thus increasing the use of fuel as the working time increases. there is a problem.

The present invention has been made to solve the above problems, and at the time of withdrawal and withdrawal of the boom assembly, by simultaneously operating the withdrawal boom to shorten the withdrawal and withdrawal time, it is possible to reduce the use of fuel in accordance with the reduction of working time It is an object of the present invention to provide a crane boom assembly drive device.

The boom assembly driving apparatus of the crane according to the present invention, when the boom assembly is pulled out and pulled in, simultaneously operates the drawout boom to shorten the take-out and pull-out time, reducing the use of fuel in accordance with the shortening of the working time.

By minimizing the number of cylinders used for withdrawal and withdrawal of the boom assembly, it reduces the manufacturing cost and weight.

1 is a schematic side view of a conventional crane,

2 is a cross-sectional view of the crane boom assembly driving apparatus employed in FIG.

3 is a cross-sectional view of a crane boom assembly driving apparatus according to an embodiment of the present invention.

The boom assembly driving apparatus of the crane according to the present invention for solving the above problems, the main boom, a plurality of take-out boom coupled to the draw-out and coupled to the inside of the main boom, the take-out and part of the take-out boom In the boom assembly driving device of the crane is provided with a cylinder device, the wires to operate the rest of the take-out boom, and the pulleys are wound around the wire, the first take-out boom to the N When a draw-out boom (N is a natural number of 4 or more) is inserted, a first rod fixed to the main boom and the first rod is inserted into and out of the main boom so as to draw in and out the first draw-out boom from the main boom. A first cylinder having a first cylinder body fixed to the first draw-out boom; A second rod fixed to the second take-out boom and the second rod are inserted into and out of the second cylinder to operate simultaneously with the first cylinder body and to withdraw the third take-out boom from the second take-out boom; A second cylinder having a second cylinder body fixed to the take-out boom; A first wire having one end coupled to the main boom and the other end coupled to the second draw-out boom; A first pulley installed on the first draw-out boom and walking on the first wire; And a second wire having one end coupled to the second take-out boom and the other end coupled to the main boom. And a second pulley installed on the first draw-out boom and guiding the first wire by walking.

In addition, a third wire having one end coupled to the second take-out boom and the other end coupled to the fourth take-out boom; A third pulley installed on the third take-out boom and walking on the third wire; A fourth wire having one end coupled to the third drawout boom and the other end coupled to the fifth drawout boom; A fourth pulley installed on the fourth take-out boom and guiding the fourth wire by walking; A fifth wire having one end coupled to the fifth takeout boom and the other end coupled to the third takeout boom; A fifth pulley installed on the second cylinder body and guiding the fifth wire by walking; A sixth pulley for guiding the fifth wire by walking is provided at one end, and the other end thereof is a dummy cylinder fixed to the second take-out boom.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the boom assembly driving apparatus of the crane according to the present invention relates to a driving apparatus for drawing out and drawing out a boom assembly. The driving device of the boom assembly includes a main boom, a plurality of draw-out booms that are coupled to the inside of the main boom so as to be drawable, a cylinder device which draws in and out some of the draw-out booms, and the rest of the draw-out booms. Wires and pulleys to which the wires are wound.

3 is a cross-sectional view of a boom assembly driving device of a crane according to an embodiment of the present invention.

3, the boom assembly driving apparatus of the crane according to the embodiment of the present invention, the first cylinder 210, the second cylinder 220, the first wire 310, the first pulley 311, the second The wire 810 and the second pulley 811 is included.

The crane boom assembly driving apparatus according to the present invention is to draw in and out of the main boom 101 and a plurality of draw-out booms sequentially inserted into the main boom 101, the main boom 101 has a first draw-out boom ( 102) to N-th outgoing boom (N is a natural number of 4 or more) are inserted. Referring to FIG. 3, the driving device of the crane boom assembly according to the present embodiment shows a form in which five draw-out booms are inserted into the main boom 101.

The first cylinder 210 is provided to draw in and out the first draw-out boom 102 from the main boom 101. The first cylinder 210 includes a first rod 201 and a first cylinder body 203.

One end of the first rod 201 is fixed to the main boom 101, and the first rod 201 is inserted into the first cylinder body 203 so that the first rod 201 is detachably coupled. The first cylinder body 203 is fixed to the first draw-out boom 102. In this embodiment, one end of the first cylinder body 203 is fixed to the front end of the first draw-out boom 102.

When the first rod 201 of the first cylinder 210 protrudes from the first cylinder body 203, the first draw-out boom 102 is withdrawn from the main boom 101 and the first rod 201. ) Is inserted into the first cylinder body 203, the first draw-out boom 102 is drawn into the main boom 101.

The second cylinder 220 operates simultaneously with the first cylinder 210. The second cylinder 220 is provided to draw in and out of the third draw-out boom 104 from the second draw-out boom 103. The second cylinder 220 includes a second rod 202 and a second cylinder body 204.

The second rod 202 is fixed to the second draw-out boom 103 and is inserted into the second cylinder body 204 and coupled to protrude. The second cylinder body 204 is fixed to the third draw-out boom 104. In this embodiment, one end of the second cylinder body 204 is fixed to the front end of the third draw-out boom 104.

When the second rod 202 of the second cylinder 220 protrudes from the second cylinder body 204, the third draw-out boom 104 protrudes from the second draw-out boom 103 and the second When the rod 202 is inserted into the second cylinder body 204, the third draw-out boom 104 is drawn into the second draw-out boom 103.

The first wire 310 is provided to withdraw the second draw-out boom 103 from the first draw-out boom 102. One end of the first wire 310 is coupled to the main boom 101 and the other end is coupled to the second draw-out boom 103.

The first pulley 311 is provided to guide the first wire 310 by walking, and is provided in the first drawout boom 102. In this embodiment, the first pulley 311 is the end side of the first draw-out boom 102 (the opposite side of the tip end portion of which one end of the first cylinder body 203 is fixed to the first draw-out boom 102) ) Is placed.

When the first draw-out boom 102 is drawn out by the first cylinder 210, the first pulley 311 disposed in the first draw-out boom 102 moves to the right, so that the second draw-out The mouth boom 103 is withdrawn from the first draw-out boom 102.

The second wire 810 is provided to lead the second draw-out boom 103 into the first draw-out boom 102. One end of the second wire 810 is coupled to the second draw-out boom 103, and the other end of the second wire 810 is coupled to the main boom 101.

The second pulley 811 is provided to walk the second wire 810. The second pulley 811 is installed in the first drawout boom 102. In this embodiment, the second pulley 811 is disposed at the tip of the first draw-out boom 102.

When the first rod 201 of the first cylinder 210 is inserted into the first cylinder body 203, the first draw-out boom 102 is drawn into the main boom 101. At this time, since the second pulley 811 installed in the first draw-out boom 102 moves together with the first draw-out boom 102, the second pull-out boom 103 moves into the first draw-out boom 102. It is pulled in.

On the other hand, the boom assembly driving device of the crane according to the embodiment of the present invention, the third wire 410, the third pulley 411, the fourth wire 510, the fourth pulley 511, the fifth wire 710. And a fifth pulley 711 and a dummy cylinder 600.

The third wire 410 is provided to draw the fourth draw-out boom 105 from the third draw-out boom 104. One end of the third wire 410 is coupled to the second draw-out boom 103 and the other end is coupled to the fourth draw-out boom 105.

The third pulley 411 is provided to guide the third wire 410 by walking. The third pulley 411 is installed in the third draw-out boom 104. In this embodiment, the third pulley 411 is disposed at the end of the third draw-out boom 104.

The fourth wire 510 is provided to draw the fifth draw-out boom 106 from the fourth draw-out boom 105. One end of the fourth wire 510 is coupled to the third draw-out boom 104 and the other end is coupled to the fifth draw-out boom 106.

The fourth pulley 511 is provided to guide the fourth wire 510 by walking. The fourth pulley 511 is installed in the fourth draw-out boom 105. In the present embodiment, the fourth pulley 511 is disposed at the end of the fourth draw-out boom 105.

The fifth wire 710 is provided to lead the fifth draw-out boom 106 into the fourth draw-out boom 105. One end of the fifth wire 710 is coupled to the fifth draw-out boom 106 and the other end is coupled to the third draw-out boom 104.

The fifth pulley 711 and the sixth pulley 712 are provided to walk the fifth wire 710. The fifth pulley 711 is installed in the second cylinder body 204, and the sixth pulley 712 is installed at one end of the dummy cylinder 600 to be described later. In the present embodiment, the fifth wire 710 extends from one end of the fifth draw-out boom 106 and is wound around the fifth pulley 711 first, and then wound around the sixth pulley 712 and then the fifth draw-out boom. It extends in the direction extending from the 106 to the fifth pulley 711 side is fixed to the third draw-out boom 104.

The other end of the dummy cylinder 600 opposite to one end of the sixth pulley 712 is fixed to the second draw-out boom 103. The dummy cylinder 600 is a rodless cylinder, and is provided to maintain a constant distance from the tip of the second draw-out part to the sixth pulley 712 in the embodiment of the present invention.

Hereinafter, the operation of the boom assembly driving device of the crane by the above configuration will be described in detail.

First, a process of drawing out a plurality of draw-out booms from the main boom 101 will be described.

Since the first and

second cylinders

210 and 220 operate at the same time, the first draw-out boom 102 is withdrawn from the main boom 101, and at the same time, the third draw-out boom 104 is with the second draw-out boom ( Withdrawn from 103).

Specifically, when the first rod 201 of the first cylinder 210 protrudes from the first cylinder body 203, the first cylinder body 203 moves to the right and is coupled to the first cylinder body 203. The first first take-out boom 102 is drawn out from the main boom 101. When the second rod 202 of the second cylinder 220 protrudes from the second cylinder body 204, the second cylinder body 204 moves to the right and is coupled to the second cylinder body 204. The third take-out boom 104 is withdrawn from the second take-out boom 103.

At this time, when the first cylinder body 203 is moved to the right, the first pulley 311 coupled to the first draw-out boom 102 moves to the right, so that the second draw-out boom 103 is the first draw-out boom 102. Is withdrawn. That is, one end of the first wire 310 is fixed to the end of the main boom 101, the other end is fixed to the second draw-out boom 103, the length of the first wire 310 is constant, so the first When the pulley 311 moves to the right, the position of the coupling point of the first wire 310 coupled to the second draw-out boom 103 moves to the right, so that the second draw-out boom 103 moves to the first draw-out boom 102. Is withdrawn.

As such, the main boom 101 and the first, second and third take-out

booms

102, 103 and 104 are simultaneously drawn out. The first draw-out boom 102 is withdrawn from the main boom 101 by the first cylinder 210, and the third draw-out boom 104 is pulled from the second draw-out boom 103 by the second cylinder 220. At this time, the second draw-out boom 103 is drawn out at the same time by the first wire 310 and the first pulley (311).

Next, the withdrawal process of the fourth draw-out boom 105 and the fifth draw-out boom 106 will be described.

When the third draw-out boom 104 is drawn out from the second draw-out boom 103 by the second cylinder 220, the fourth draw-out boom 105 and the fifth draw-out boom 106 are simultaneously drawn out.

When the third draw-out boom 104 is pulled out, the third pulley 411 coupled to the end of the third draw-out boom 104 moves to the right. The third wire 410 hanging on the third pulley 411 has one end connected to the second takeout boom 103 and the other end connected to the fourth takeout boom 105. Therefore, since the length of the third wire 410 is constant, when the third pulley 411 is moved to the right, the position of the coupling point where the third wire 410 is connected to the fourth draw-out boom 105 is moved to the right. Since it moves, the fourth draw-out boom 105 is drawn out from the third draw-out boom 104.

When the fourth draw-out boom 105 is withdrawn from the third draw-out boom 104, the fourth pulley 511 coupled to the end of the fourth draw-out boom 105 moves to the right. The fourth wire 510 hanging on the fourth pulley 511 has one end connected to the third draw-out boom 104 and the other end connected to the fifth draw-out boom 106. Since the length of the fourth wire 510 is constant, when the fourth pulley 511 is moved to the right, the position of the coupling point connected to the fourth pull-out boom 106 is moved to the right. Therefore, the fifth draw-out boom 106 is drawn out from the fourth draw-out boom 105.

In this way, the fourth take-out boom 105 and the fifth take-out boom 106 are the first, second, third take-out

booms

102, 103, 104 withdrawal from the main boom 101 and the third, fourth take-out boom, respectively. Withdrawal from (104,105).

On the other hand, the boom assembly driving apparatus of the crane according to the embodiment of the present invention is introduced through the following process.

When the first rod 201 of the first cylinder 210 is inserted into the first cylinder body 203, the first draw-out boom 102 is led into the main boom 101. As with the drawing process, when the second rod 202 of the second cylinder 220 is inserted into the second cylinder body 204 at the same time as the operation of the first cylinder 210, the third drawing-out boom 104 is second drawn out. It is drawn into the interior of the mouth boom 103.

At this time, the second pulley 811 coupled to the front end of the first draw-out boom 102 is moved to the left to pull the second draw-out boom 103. That is, since one end of the second wire 810 having a constant length is connected to the second draw-out boom 103 and the other end is coupled to the main boom 101, the second pulley 811 moves to the right. The second take-out boom 103 is pulled so that the second take-out boom 103 is drawn into the first take-out boom 102.

As such, the first, second, and third take-out

booms

102, 103, and 104 are simultaneously introduced by the first and

second cylinders

210 and 220, the second wire 810, and the second pulley 811.

Next, the pulling in process of the 4th drawing-out boom 105 and the 5th drawing-out boom 106 is demonstrated.

When the first, second and third take-out

booms

102, 103 and 104 are introduced by the first cylinder 210, the second cylinder 220, the second wire 810 and the second pulley 811, the fourth take-out boom 105 ) And the fifth draw-out boom 106 are introduced at the same time.

Specifically, when the second draw-out boom 103 and the third draw-out boom 104 are pulled in, the third pulley 411 coupled to the end of the third draw-out boom 104 moves to the left. The fourth pulley 511 is pulled to the left while pulling the fourth wire 510 while the third draw-out boom 104 moves to the left. Thus, the fourth draw-out boom 105 and the fifth draw-out boom 106 simultaneously move to the left side.

At this time, the fifth wire 710 pulls the fifth draw-out boom 106. Specifically, one end of the fifth wire 710 is connected to the fifth draw-out boom 106 and the other end is connected to the third draw-out boom 104. When the second rod 202 of the second cylinder 220 is inserted into the second cylinder body 204, the fifth pulley 711 coupled to the second cylinder body 204 moves to the left. Meanwhile, since the sixth pulley 712 is coupled to one end of the dummy cylinder 600 and the other end is fixed to the second drawout boom 103, the fifth pulley 711 moves to the left when the fifth pulley 711 moves to the left. The distance between the pulley 711 and the sixth pulley 712 is farther away. Therefore, the fifth draw-out boom 106 is drawn into the fourth draw-out boom 105.

That is, the fifth wire 710 is pulled together with the operation of inserting the fourth draw-out boom 105 and the fifth draw-out boom 106 into the third draw-out boom 104 and the fourth draw-out boom 105, respectively. 5 The draw-out boom 106 is drawn into the fourth draw-out boom 105, and the fourth wire 510 connected to the fourth draw-out boom 105 is pulled out by the insertion operation of the fourth draw-out boom 105. The third pulley 411 provided at the end of the third take-out boom 104 is pulled in while being pushed to the left.

As such, the boom assembly driving device of the crane according to the embodiment of the present invention reduces the time required for drawing and drawing by simultaneously pulling in and drawing out a plurality of draw-out booms from the main boom, thereby improving work efficiency and reducing work time. This provides the effect of reducing fuel use.

In addition, by minimizing the number of cylinders used for the withdrawal and withdrawal of the take-out boom from the main boom provides an effect of reducing the manufacturing cost and weight.

In the above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and many other modifications may be provided without departing from the scope of the present invention.

101 ... Main boom 102 ... First draw-out boom

103 ... The second draw-out boom 104 ... The third draw-out boom

105 ... The fourth draw-out boom 106 ... The fifth draw-out boom

210 ... first cylinder 201 ... first rod

203. 1st cylinder body 220 ... 2nd cylinder

202 ... 2nd rod 204 ... 2nd cylinder body

310 ... First wire 311 ... First pulley

410 ... third wire 411 ... third pulley

510 ... fourth wire 511 ... fourth pulley

600. Dummy cylinder 710 ... Fifth wire

711 ... Fifth Pulley 712 ... Fifth Pulley

810 ... second wire 811 ... second pulley

Claims

A main boom, a plurality of draw-out booms coupled to draw in and out of the main boom, a cylinder device for drawing out some of the draw-out booms, wires for activating the rest of the draw-out booms, and the wires In the crane boom assembly driving device is provided with pulleys are wound

When the first draw-out boom to the N-th draw-out boom (N is a natural number of 4 or more) is sequentially inserted into the main boom,

A first rod fixed to the main boom so as to draw in and out the first draw-out boom from the main boom, and a first cylinder body inserted into and retracted from the main boom and fixed to the first draw-out boom; 1 cylinder;

A second rod fixed to the second take-out boom and the second rod are inserted into and out of the first cylinder body so as to operate simultaneously with the first draw-out boom and to draw in and out of the second draw-out boom; A second cylinder having a second cylinder body fixed to the take-out boom;

A first wire having one end coupled to the main boom and the other end coupled to the second draw-out boom;

A first pulley installed on the first draw-out boom and walking on the first wire; And

A second wire having one end coupled to the second take-out boom and the other end coupled to the main boom; And

And a second pulley installed on the first draw-out boom and configured to walk the first wire to guide the crane boom assembly.
The method of claim 1,

A third wire having one end coupled to the second takeout boom and the other end coupled to the fourth takeout boom;

A third pulley installed on the third take-out boom and walking on the third wire;

A fourth wire having one end coupled to the third drawout boom and the other end coupled to the fifth drawout boom;

A fourth pulley installed on the fourth take-out boom and walking on the fourth wire;

A fifth wire having one end coupled to the fifth takeout boom and the other end coupled to the third takeout boom;

A fifth pulley installed on the second cylinder body and guiding the fifth wire by walking;

And a sixth pulley configured to guide the fifth wire by walking, the other end being provided with a dummy cylinder fixed to the second pull-out boom.