KR102246187B1 - Crane boom assembly - Google Patents

Abstract

The present invention relates to a crane boom assembly with easy replacement of a wire rope and, more specifically, to a boom assembly including multiple booms ranging from first to nth, provided in a telescopic structure to be extendable; a cylinder provided to connect the first boom and the second boom to lead the second boom to be moved into and out from the first boom; a wire rope for withdrawal extending the multiple booms by withdrawing the same when the cylinder is operated; and a wire rope for lead-in contracting the multiple booms by leading the same in when the cylinder is operated. The wire rope for lead-in has its one end fixed to the first boom on the outermost side, while having the other end fixed to the nth boom on the innermost side, which is moved into and out from the first boom, and the wire rope for lead-in between the first boom and the nth boom is wound on a sheave provided on the second boom to be rotatable. Therefore, the present invention is capable of reducing time and costs for assembly.

Description

Crane boom assembly for easy wire rope replacement {Crane boom assembly}

The present invention relates to a boom assembly provided in a crane, and more particularly, to a crane boom assembly in which a wire rope provided in a telescopic boom assembly can be easily separated and assembled from the boom assembly, and the wire rope can be easily replaced. will be.

In general, a crane refers to a machine or machinery that uses power to transport cargo up and down, back and forth, and left and right. Cranes are roughly classified into hydraulic and crawler, and most of the hydro cranes are equipped with a boom in a telescopic manner.

The telescopic boom, or multi-stage telescopic boom, is a type of variable length boom widely used in many special vehicles such as cranes, ladder trucks, and aerial work vehicles that perform work from high positions.

In the case of vehicle-mounted mobile crane equipment or aerial work vehicles, it is common to make a telescopic boom with booms of various sizes formed in the shape of a roughly square tube.The extension and contraction of the telescopic boom are hydraulic cylinders, wire ropes, and chains installed inside the telescopic boom. It is made by, etc.

Specifically, several hydraulic cylinders may be used, a single hydraulic cylinder and a wire rope may be combined, or a single chain may constitute a boom elongation and contraction mechanism.

A device for introducing and withdrawing a telescopic boom by a combination of a wire rope and a chain has been proposed in Korean Utility Model No. 20-2012-0007761 (hereinafter referred to as'prior technical literature 1').

Among them, a mechanism that combines a hydraulic cylinder and a wire rope is widely used because of the economical aspect of manufacturing cost and ease of maintenance. Typically, a hydraulic cylinder is installed inside a telescopic boom, whereas a wire rope and a wire rope boom are used. A sheave for controlling the elongation or contraction of the telescopic boom is installed on the outside of the telescopic boom. This is also the result of considering the ease of manufacture and maintenance and economics.

Particularly, among the wire ropes configured in the telescopic boom, a wire rope for drawing, which is a relatively strong wire, is provided on the outside of the telescopic boom, and a wire rope for drawing having weaker rigidity than the wire rope for drawing is provided on the inside of the telescopic boom.

The wire rope constructed in this way may be worn or damaged by accumulated fatigue due to long use, and in this case, the wire rope must be replaced. In particular, the telescopic boom when replacing the lead-in wire rope provided inside the telescopic boom It is impossible to replace without disassembling it, and accordingly, since the wire rope for lead-in is replaced with the telescopic boom completely disassembled, there is a disadvantage in that a lot of assembly time and cost are generated according to the replacement.

Republic of Korea Public Utility Model No. 20-2012-0007761

Therefore, the present invention was conceived to solve the problems of the prior art as described above, and a wire rope for lead-in inside the telescopic boom assembly is constructed in a simple structure, and for lead-in from the outside of the boom assembly without disassembling the boom assembly. It is an object of the present invention to provide a crane boom assembly in which the wire rope can be easily replaced by disassembling and assembling the wire rope easily.

The crane boom assembly, which is easy to replace the wire rope according to the present invention for achieving the above object, connects the first to n-stage multi-stage boom, which is telescopically provided in a telescopic structure, and the first-stage boom and the second-stage boom. Includes a cylinder for entering and exiting the second-stage boom from the first-stage boom, a pull-out wire rope for pulling out and extending the multi-stage boom when the cylinder is operated, and a wire rope for pulling in and reducing the multi-stage boom when the cylinder is operated. As a boom assembly, the lead-in foreign word rope is provided with one end fixed to the first stage boom on the outermost side, while the other end is fixedly provided on the innermost n-stage boom exiting from the first stage boom, and the first stage boom. The wire rope for lead-in between the and the n-stage boom may be provided by being wound on a sheave rotatably provided on the 2-stage boom.

In addition, a fixing bracket is coupled to the first-stage boom, and one end of the wire rope for lead-in may be fixedly provided on the fixing bracket.

In addition, a connecting sheave on which a lead-in wire rope is wound is rotatably provided in the fixing bracket, and the sheave of the two-stage boom is installed in parallel with the connecting sheave on the second-stage boom and rotates. Including a second lead-in sheave that is installed to be rotated and intersected with the first lead-in sheave on the boom, the lead-in wire rope drawn out from the fixing bracket is wound on the first lead-in sheave of the two-stage boom and then the fixing bracket. After being rewound on the connecting sheave of the two-stage boom, after being wound on the second lead-in sheave of the two-stage boom, it may be pulled out to the n-stage boom to be fixedly provided.

In addition, the first-stage boom may be provided with a service window exposing the sheave of the second-stage boom and the lead-in wire rope wound thereon.

According to the crane boom assembly, which is easy to replace the wire rope of the present invention, a wire rope for pull-in provided in a telescopic boom assembly consisting of several stages is provided with a length in consideration of the total stroke from which the boom assembly is completely pulled out, and a wire rope for pull-in. By fixing both ends of the boom to the first stage boom and the fifth stage boom, respectively, there is an advantage that the wire rope for lead-in in the boom assembly can be configured in a simple structure.

And, according to the present invention, since the wire rope for lead-in can be easily disassembled and assembled from the outside of the boom assembly without disassembling the boom assembly through the service window for servicing the wire rope for lead-in to the first-stage boom, the lead-in wire It is easy to assemble and maintain the rope, thereby improving workability and reducing assembly time and cost.

1 is a schematic configuration diagram of a wire rope for withdrawal configured in a boom assembly of the present invention.
Figure 2 is a schematic view of a boom assembly according to the present invention.
3 is a separate configuration diagram of the boom assembly according to the present invention.
Figure 4 is a configuration diagram showing a wire rope for lead-in configured inside the boom assembly according to the present invention, Figure 4a is an internal configuration diagram showing the rear end of the boom assembly, Figure 4b is showing the front end of the boom assembly It is an internal configuration diagram.
5 to 10 are views showing the disassembling process of the wire rope for lead-in in the boom assembly according to the present invention, FIG. 5 is a view in a state in which the fixing bracket is released from the first stage boom, and FIG. 6 is a first stage It is a diagram of a state in which the rest of the boom is moved forward from the boom, FIG. 7 is a view in a state in which the tip of the wire rope for lead-in fixed to the fixing bracket is removed, and FIG. Fig. 9 is a view showing the connection sheave of the fixing bracket and the lead-in wire rope wound on the connection sheave are removed, and Fig. 10 is a view of the second sheave of the two-stage boom. It is a drawing of a state in which the lead-in wire rope is removed by separating the lead-in wire rope from the fixed block of the 5-stage boom while removing the lead-in wire rope.

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

The terms used in the present invention are terms defined in consideration of functions in the present invention, and since these may vary according to the intention or custom of users or operators, the definitions of these terms correspond to the technical matters of the present invention. And should be interpreted as a concept.

In addition, the embodiments of the present invention do not limit the scope of the present invention, but are merely exemplary matters of the elements presented in the claims of the present invention, and are included in the technical idea throughout the specification of the present invention. This is an embodiment including a component that can be substituted as an equivalent in the component.

In addition, optional terms in the following embodiments are used to distinguish one component from other components, and the component is not limited by the terms.

Accordingly, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 to 10 are views showing a crane boom assembly for easy replacement of a wire rope according to the present invention.

The boom assembly 100 according to the present invention is configured by combining a multi-stage boom consisting of a first-stage boom 110 to an n-stage boom in a telescopic structure, as shown in FIGS. 1 to 3, and the multi-stage boom has the largest diameter It is a boom assembly that is sequentially inserted and coupled from the first stage boom 110 and the first stage boom 110 in the second stage boom 120 having a smaller diameter to the n stage boom having the smallest diameter.

Here, in this embodiment, as an example of the boom assembly 100, a multi-stage boom consisting of five booms from the first-stage boom 110 having the largest diameter to the five-stage boom 150 having the smallest diameter will be described.

Accordingly, the second-stage boom 120 is inserted and provided in the first-stage boom 110 with the largest diameter, and the third-stage boom 130 is inserted and provided in the second-stage boom 120, and the third-stage boom ( 130) is provided with a four-stage boom 140, and a five-stage boom 150 having the smallest diameter is inserted into the four-stage boom 140.

Further, a cylinder means for connecting the first-stage boom 110 and the second-stage boom 120 is provided on the outer surface between the first-stage boom 110 and the second-stage boom 120.

That is, the cylinder means is a cylinder 160 hinged to the outer surface of the first-stage boom 110, as shown in FIG. 1, and is hinged to the second-stage boom 120 while entering and leaving the cylinder 160. Including the rod 161, as the rod 161 enters and exits from the cylinder 160, the second-stage boom 120 is provided to be directly in and out of the first-stage boom 110.

In addition, as the two-stage boom 120 enters and exits from the first-stage boom 110 as described above, the three-stage boom 130, the four-stage boom 140, and the five-stage boom 150 are two-stage boom 120 and As such, the three-stage boom 130 to the five-stage boom 150 are connected in series and provided to be automatically in and out. It is operated by interlocking with the two-stage boom 120 by the rope 300.

First, the wire rope for withdrawal 200, 201, 202 is interlocked with the second-stage boom 120 when the second-stage boom 120 is directly withdrawn from the first-stage boom 110 by the cylinder 160 The three-stage boom 130, the four-stage boom 140, and the five-stage boom 150 are automatically withdrawn in series to extend the boom assembly 100 of the multi-stage boom.

These wire ropes 200, 201, 202 for withdrawal are provided in three between the first-stage boom 110 to the fifth-stage boom 150, as shown in FIG. 1, and wire ropes 200 for each draw-out. ) (201, 202) are provided with sheaves 121, 131, and 141 for withdrawal, respectively, and are modularized.

That is, the first withdrawal wire rope 200 is provided with one end fixed to the front end of the outer surface of the first stage boom 110, the other end is provided to be fixed to the rear end of the outer surface of the third stage boom 130 , At the front end of the outer surface of the two-stage boom 120, a first withdrawal sheave 121 to which the first withdrawal wire rope 200 is wound is rotatably installed and provided.

In addition, the second withdrawal wire rope 201 is provided with one end fixed to the front end of the outer surface of the two-stage boom 120, the other end is provided to be fixed to the rear end of the outer surface of the four-stage boom 140 , At the front end of the outer surface of the three-stage boom 130, a second withdrawal sheave 131 on which a second withdrawal wire rope 201 is wound is rotatably installed and provided.

In addition, the third withdrawal wire rope 202 is provided to be fixed to the front end of the outer surface of the three-stage boom 130, the other end is provided to be fixed to the rear end of the outer surface of the five-stage boom (150). , A third withdrawal sheave 141 on which the third withdrawal wire rope 202 is wound is rotatably installed and provided at the front end of the outer surface of the four-stage boom 140.

Thus, when the rod 161 is withdrawn from the cylinder 160, the second-stage boom 120 is withdrawn from the first-stage boom 110, and at the same time as the second-stage boom 120 is withdrawn, the first withdrawal sheave provided therein (121) is moved together with the two-stage boom 120, and the first withdrawal wire rope 200 is pulled in the moving direction of the first withdrawal sheave 121 by the moving first withdrawal sheave 121 Accordingly, the three-stage boom 130 is automatically withdrawn from the second-stage boom 120.

And, as the three-stage boom 130 is withdrawn from the two-stage boom 120, in the same manner as the stretching operation of the first and second-stage booms 110 and 120 described above, the four-stage boom 130 140) is automatically pulled out, and as the fourth boom 140 is pulled out from the third boom 130, the fifth boom 150 is automatically pulled out and extended from the fourth boom 140.

Therefore, the rod in the cylinder 160 by the first to third withdrawal wire ropes 200, 201, 202 and the first to third withdrawal sheaves 121, 131, 141 as described above ( As 161 is withdrawn, the second-stage boom 120 to the fifth-stage boom 150 from the first-stage boom 110 are automatically drawn out and elongated at the same time.

In addition, when the 5-stage boom 150 is drawn into the 4-stage boom 140 from the multi-stage boom elongated as described above, the third withdrawal wire rope 202 is inserted into the 4-stage boom 140 and the third Since the pull-out sheave 141 is towed toward the movement direction of the five-stage boom 150, the four-stage boom 140 provided with the third pull-out sheave 141 is automatically drawn into the three-stage boom 130.

And, as the fourth-stage boom 140 is inserted into the third-stage boom 130, the third-stage boom 130 is moved into the second-stage boom 120 in the same manner as the five-stage boom 150 described above. It is automatically inserted and reduced. At this time, as the three-stage boom 130 is inserted into the second-stage boom 120, the second-stage boom 120 may be automatically inserted into the first-stage boom 110, but the second-stage boom 120 is a cylinder 160 ) Is moved directly into the first stage boom 110 and is brought in.

In this way, the multi-stage boom extended by the first to third draw-out wire ropes 200, 201, 202 and the first to third draw-out sheaves 121, 131, and 141 is a one-stage boom 110 ) It is automatically inserted into the interior at the same time and provided to be reduced.

On the other hand, the wire rope 300 for lead-in is interlocked with the second-stage boom 120 when the second-stage boom 120 is inserted into the first-stage boom 110 by the cylinder 160, and the third-stage boom 130 to It is configured to reduce the boom assembly 100 of the multi-stage boom by automatically inserting the five-stage boom 150 into the first-stage boom 110.

As shown in FIGS. 3 to 4B, the wire rope 300 is provided to connect the first-stage boom 110, the second-stage boom 120, and the fifth-stage boom 150 as shown in FIGS. 3 to 4B. However, in the present embodiment, a single row of wire ropes 300 for lead-in is provided on both left and right sides, respectively, as an example and described.

That is, the external fish rope 200, 201, 202 for lead-in is provided with one end fixed to the inner front end of the first-stage boom 110, and the other end is the inner rear end of the fifth-stage boom 150 It is provided to be fixed on.

And, the wire rope 300 for lead-in between the first-stage boom 110 and the fifth-stage boom 150 is wound inside the first-stage boom 110 between the first-stage boom 110 and the second-stage boom 120 The wire rope 300 for lead-in, which is provided in a state, and is wound in the first-stage boom 110, is the length in which the boom assembly 100 is completely elongated, that is, the first-stage boom 110 to the second-stage boom 120 to the fifth-stage boom 150 is completely drawn out and is provided with a length in consideration of the elongated length.

As described above, the wire rope 300 for lead-in between the first-stage boom 110 and the fifth-stage boom 150 is provided by being wound on a plurality of sheaves within the first-stage boom 110, so that the overall stroke of the boom assembly 100 That is, it is provided with a length that can cover the entire length of the fully elongated boom assembly 100.

To this end, a fixing bracket 114 is coupled to and provided at the front end of the first stage boom 110, and the fixing bracket 114 is inserted into the first stage boom 110 to be inserted into the inner side of the first stage boom 110. It includes a mounting plate (114a) provided in a contact state, and a flange (114b) formed bent outward from the front end of the mounting plate (114a).

The mounting plate 114a of the fixing bracket 114 is provided to be coupled and fixed at one end of the lead-in wire rope 300, and the fixing bracket 114 under the fixed lead-in wire rope 300 has a wire rope for lead-in. The connecting sheave 115 to which the 300 is wound is rotatably provided.

Further, the flange 114b of the fixing bracket 114 is bolted to the flange 113 bent outwardly at the front end of the first stage boom 110 to be fixedly provided.

On the other hand, on the outer surface of the rear end of the two-stage boom 120 opposite the fixing bracket 114 provided as described above, the first inlet sheave ( 122) is rotatably provided, and is installed to be intersected with the first lead-in sheave 122 on the inner side of the rear end of the two-stage boom 120, and the second lead-in sheave 123 is wound around the lead-in wire rope 300 ) Is rotatably provided.

In this way, when describing in detail the winding structure of the lead-in wire rope 300 that is caught on each sheave inside the first-stage boom 110, the lead-in wire rope 300 has one end of the first-stage boom as shown in FIG. 4B. The first of the second-stage boom 120 is pulled out to the rear of the first-stage boom 110 in a state that is coupled to the mounting plate 114a of the fixing bracket 114 coupled to the front end of the 110 After being wound on the retractable sheave 122 and being wound, it is again drawn out to the front of the first-stage boom 110 and wound around the connecting sheave 115 of the fixing bracket 114, and then again, the first-stage boom 110 The other end of the lead-in wire rope 300 is provided to be coupled and fixed to the inner side of the 5-stage boom 150 while being drawn out to the rear of the second stage boom 120 and wound around the second lead-in sheave 123 of the 2-stage boom 120. .

Here, the reason that the first retractable sheave 122 and the second retractable sheave 123 are provided to cross each other is that the moving force to reduce the multi-stage boom in a narrow space inside the boom assembly 100 is applied to the wire rope ( It is to reduce the load (tension) acting on the lead-in wire rope 300 in addition to the efficient transmission through 300).

And, as described above, a fixed block 151 is provided inside the five-stage boom 150 to which the other end of the lead-in wire rope 300 is coupled and fixed, and the fixed block 151 is a five-stage boom 150 It may be integrally formed in the inside of or may be provided to be fixed to the inside of the 5-stage boom 150.

Such a fixed block 151 is provided with an upper plate and a lower plate protruding rearward on the rear side thereof, and a fixed shaft 152 is penetrated to the upper and lower plates, and the fixed shaft 152 through which the fixed shaft 152 is A fixing pin 153 for preventing arbitrary separation is coupled through, and the other end of the wire rope 300 for lead-in is inserted into the fixing shaft 152 between the upper and lower plates to be coupled and fixed.

Therefore, the wire rope 300 for lead-in is reduced by pulling all the multi-stage booms drawn out while moving together with the 5-stage boom 150 into the first-stage boom 110.

On the other hand, since the wire rope 300 for lead-in according to the present invention configured as described above is also configured inside the boom assembly 100, the multi-stage boom of the boom assembly 100 must be separated in order to maintain or replace it, In the present invention, one end of the lead-in wire rope 300 is not directly fixed to the first-stage boom 110, but is coupled and fixed to the fixing bracket 114 coupled to the first-stage boom 110, and to the first-stage boom 110. By forming a plurality of service windows 111, 112, it is possible to separate or assemble the wire rope 300 for lead-in without separating the boom assembly 100.

That is, the service windows 111 and 112 exposing the first and second lead-in sheaves 122 and 123 of the second-stage boom 120 and the lead-in wire rope 300 wound thereon to the first-stage boom 110. ) Is provided.

These service windows 111 and 112 are preferably formed on the side and rear sides of the first-stage boom 110, and in particular, the side service windows 111 may be provided in a form that is always open, and the rear service window 112 ) May be provided to be selectively opened by providing a separate opening and closing plate.

In addition, it is preferable that all rear surfaces of the second-stage boom 120 to the fifth-stage boom 150 corresponding to the rear service window 112 of the first-stage boom 110 are provided in an open form. Accordingly, the operator can directly check the fixed block 151 in the fifth-stage boom 150 through the rear service window 112 of the first-stage boom 110 with the naked eye.

The expansion and contraction operation of the boom assembly according to the present invention as described above will be described.

First, when the boom assembly 100 is elongated, the rod 161 is withdrawn from the cylinder 160, and the second boom 120 is withdrawn from the first boom 110 by the withdrawal operation of the cylinder 160.

In this process, the first withdrawal sheave 121 provided on the outer surface of the two-stage boom 120 is moved along with the second-stage boom 120 and the first withdrawal wire rope 200 wound therein is withdrawn. As a result, the first withdrawal wire rope 200 inserted in the second-stage boom 120 is pulled out, and the third-stage boom 130 is automatically pulled out from the second-stage boom 120.

With this operation, the four-stage boom 140 from the three-stage boom 130 and the five-stage boom 150 from the four-stage boom 140 are automatically drawn out in series and at the same time.

Therefore, by the withdrawal operation of the cylinder 160, the two-stage boom 120 is directly withdrawn from the first-stage boom 110 and at the same time, each of the wire ropes 200, 201, 202 and the withdrawal sheave 121 ) (131) (141) from the 2nd boom (120) to the 3rd boom (130), the 3rd boom (130) to the 4th boom (140), and from the 4th boom (140) to the 5th boom ( 150) is automatically withdrawn so that the boom assembly 100 is elongated as shown in FIG. 1.

At this time, the wire rope 300 for lead-in is also in an elongated state by drawing the other end fixed to the fifth-stage boom 150 to the maximum based on one end fixed to the fixing bracket 114 of the first-stage boom 110. .

And, when the extended boom assembly 100 is reduced as described above, the operated cylinder 160 is retracted and the drawn rod 161 is drawn into the cylinder 160, and the cylinder 160 is pulled in. The second-stage boom 120 that was pulled out by the first-stage boom 110 is introduced into the first-stage boom 110.

At this time, the two-stage boom 120 and the five-stage boom 150 directly connected with the lead-in wire rope 300 is moved in a direction in which the second-stage boom 120 and the second-stage boom 120 are drawn in at the same time.

Then, as the third withdrawal wire rope 202 is inserted into the fourth-stage boom 140 while the fifth-stage boom 150 is inserted into the fourth-stage boom 140, the third withdrawal sheave 141 Since it is pulled toward the moving direction of the 5-stage boom 150, the 4-stage boom 140 provided with the third withdrawal sheave 141 is automatically inserted into the 3-stage boom 130.

With this operation, as the four-stage boom 140 is inserted into the three-stage boom 130, the three-stage boom 130 is automatically inserted into the second-stage boom 120 at the same time.

Therefore, the boom assembly is a simple structure in which only the first stage boom 110, the second stage boom 120 and the fifth stage boom 150 are connected with one lead-in wire rope 300, and the multi-stage boom is automatically inserted in series at the same time. 100 can be reduced as shown in FIG.

On the other hand, as described above, when the wire rope for drawing 200, 201, 202 and the wire rope 300 for retrieval, which repeatedly expands and contracts the boom assembly 100, is worn or damaged due to accumulated fatigue, this It needs to be replaced.

That is, in the present invention, the wire rope can be disassembled/assembled without disassembling the boom assembly 100, and the wire rope 200, 201, 202 and cylinder 160 for withdrawal are outside the boom assembly 100. Since it is provided, a description thereof will be omitted, and hereinafter, only the disassembly/assembly process of the lead-in wire rope 300 provided inside the boom assembly 100 will be described.

First, as shown in FIG. 5, the bolt is released from the fixing bracket 114, which was coupled to and fixed to the flange 113 of the first stage boom 110, to release the fixing of the fixing bracket 114, and in this state, FIG. As in the first stage boom 110, the second stage boom 120 is moved to a predetermined distance and withdrawn.

At this time, the withdrawal distance of the second-stage boom 120 is until the first withdrawal sheave 121 of the second-stage boom 120 is exposed through the side service window 111 formed on the side of the rear end of the first-stage boom 110 Will come true.

Then, in addition to the withdrawal of the second-stage boom 120, the fixing bracket 114 separated from the first-stage boom 110 is also moved forward and separated from the first-stage boom 110.

Thereafter, the fixed state of the lead-in wire rope 300 having one end fixed to the fixing bracket 114 separated from the first-stage boom 110 is released as shown in FIG. 7, and then as shown in FIG. 8, the first-stage boom ( Unscrew the lead-in wire rope 300 wound on the first withdrawal sheave 121 of the two-stage boom 120 exposed to the side service window 111 of 110), and again, as shown in FIG. 9, a fixing bracket ( The lead-in wire rope 300 wound around the connecting sheave 115 of 114) is released and separated.

At this time, in the fixing bracket 114 separated from the first-stage boom 110, one end of the wire rope 300 for lead in and the winding state wound around the connecting sheave 115 may be released and separated at a time, but this Since it may be difficult to unwind the lead-in wire rope 300 from the connecting sheave 115 by the tension acting on the lead-in wire rope 300, it is preferable to separate the lead-in wire rope 300 in order as described above.

On the other hand, after unscrewing the wire rope 300 for lead-in from the first withdrawal sheave 121 through the side service window 111, the 5-stage boom ( 150) the wire rope for lead-in (300) coupled to the fixed block (151) is released and separated.

That is, after removing the fixing pin 153 from the fixing shaft 152 penetrating the upper and lower plates of the fixing block 151 in the axial direction of the first-stage boom 110, the fixing shaft 152 is attached to the fixing block ( When lifted upwards of 151, the other end of the wire rope 300 for lead-in, which was coupled to the fixed shaft 152, is separated from the fixed shaft 152 as shown in FIG. 10.

Therefore, after pulling the separated wire rope for wire 300 as described above from the boom assembly 100, a new wire rope for wire wire 300 for pulling in as described above can be assembled to the boom assembly 100 in the reverse order of disassembly. The assembly and maintenance of the wire rope 300 is easy, so that workability is improved, and assembly time and cost can be reduced.

Although the present invention has been described in detail through specific examples, this is for describing the present invention in detail, and the present invention is not limited thereto, and within the technical idea of the present invention, by those of ordinary skill in the art. It is clear that modifications or improvements are possible.

All simple modifications to changes of the present invention belong to the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

100: boom assembly 110-150: boom
111,112: service window 113: flange
114: fixing bracket 114a: mounting plate
114b: flange 115: connecting sheave
121: first withdrawal sheave 122: first withdrawal sheave
123: second pull-out sheave 131: second pull-out sheave
141: third withdrawal sheave 151: fixed block
152: fixed shaft 153: fixing pin
160: cylinder 161: rod
200,201,202: wire rope for drawing out 300: wire rope for drawing in

Claims (4)

A multi-stage boom from the first to n-stage telescopic structure is provided, a cylinder that connects the first and second booms to the first and second booms, and the multi-stage boom when the cylinder is operated. A boom assembly comprising a pull-out wire rope that is pulled out and stretched, and a pull-in wire rope that pulls in and contracts a multi-stage boom when the cylinder is operated,
The lead-in foreign language rope is provided with one end fixed to the first stage boom on the outermost side, while the other end is fixedly provided on the innermost n-stage boom entering and leaving the first stage boom,
The wire rope for lead-in between the first-stage boom and the n-stage boom is provided by being wound on a sheave rotatably provided on the second-stage boom,
The first-stage boom is provided with a fixed bracket coupled thereto, and one end of the wire rope for lead-in is fixedly provided on the fixed bracket,
The fixing bracket is rotatably provided with a connecting sheave on which the wire rope for lead-in is wound,
The sheave of the two-stage boom is a first retractable sheave installed in parallel with the connecting sheave on the two-stage boom to rotate, and a second retractable sheave installed to be rotated by intersecting with the first retracting sheave on the second-stage boom. Including,
The lead-in wire rope drawn out from the fixing bracket is wound on the first lead-in sheave of the two-stage boom and then re-wound on the connecting sheave of the fixed bracket, and is wound on the second lead-in sheave of the second-stage boom. A boom assembly that is pulled out and fixedly provided.
The method according to claim 1,
A boom assembly provided with a service window exposing the sheave of the second-stage boom and the wire rope wound therein on the first-stage boom. delete delete

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