JP2007302428A - Lattice boom of mobile crane - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problem in a device for inserting an intermediate section with a small section into an intermediate section with a large section in a lattice boom of a conventional mobile crane wherein the entire device is complicated or operations are difficult to perform. <P>SOLUTION: This lattice boom of a mobile crane comprises a first guide roller 50 disposed on the lower surface of the end part 32 of the first intermediate section 23 on the side into which the second intermediate section 24 is inserted and rotatingly supporting two main column members 37 on the lower surfaces side of the second intermediate section 24, a guide rail 51 disposed on the lower inner surface of the first intermediate section 23 parallel with the main column member 33, and a second guide roller 52 disposed on the lower surface of the top end 44 when the second intermediate section 24 is inserted and rotatingly supporting the end of the second intermediate section while rolling on the guide rail 51. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lattice boom structure for a mobile crane.

  The lattice boom of a mobile crane is configured by connecting a necessary number of intermediate sections to a proximal end section and connecting a distal end section to the most advanced intermediate section. When the mobile crane equipped with a lattice boom is moved on the work site, the lattice boom is disassembled into a base end section, a unit of an intermediate section, and a tip section, respectively, and is mounted on a trailer or the like and conveyed.

  However, the intermediate section is configured by arranging auxiliary members between four main column members arranged at corners of a rectangular cross section and adjacent main members among the main members, As a material constituting the main pillar material and the auxiliary member, a pipe material is usually used. Therefore, the intermediate section, which is a long structure having a large rectangular cross section formed by combining them, has a small weight for a very large volume. For this reason, there is a problem in terms of man-hours and costs for transportation due to poor transportation efficiency for transportation on a trailer. Therefore, the intermediate section is manufactured by dividing it into two types, one with a large cross section and one with a small cross section, and the intermediate section with a small cross section is inserted into the intermediate section with a large cross section to convey, thereby improving the transport efficiency during transportation. Was adopted. However, since the intermediate section is a long structure, the operation of taking the intermediate section with a small cross section into and out of the intermediate section with a large cross section requires great care and takes time. In view of this, an apparatus for facilitating the insertion and removal has been considered.

  For example, in the device described in Patent Document 1, an insertion guide in which recesses that respectively engage with adjacent main pillars on the lower surface side during conveyance of a small section of an intermediate section are formed in the longitudinal direction inside the intermediate section of a large section. It is provided, and the insertion and removal is facilitated by guiding the intermediate section having a small cross section with the insertion guide.

Further, in the apparatus described in Patent Document 2, a guide rail is mounted on the lower inner side of the intermediate section having a large cross section during conveyance, and the guide rail is provided in the intermediate section having a small cross section when being taken in and out. It is easy to take in and out by receiving and guiding.
Japanese Utility Model Publication No. 63-8704 (page 1-2, Fig. 1-2) The microfilm of the actual application No. 61-32078 (No. 62-144894) (page 5-7, Fig. 1-2)

  However, in the apparatus described in Patent Document 1, in order to stably support the intermediate section having a small cross section over the entire process of taking in and out, the insertion guide is provided with three or more insertion guides in the longitudinal direction of the intermediate section having a large cross section. Therefore, there is a problem that the entire apparatus becomes complicated.

  On the other hand, in the apparatus described in Patent Document 2, the distal end of the intermediate section with a small cross section is guided by the guide roller and the guide rail, but the proximal end of the intermediate section with the small cross section is the other crane from the beginning to the end of loading and unloading. There was a problem that it was difficult to work because it was necessary to support it by hanging it.

  SUMMARY OF THE INVENTION Accordingly, the present invention is intended to provide a mobile crane lattice boom having a device that is easy to put in and out and that is easy to put in and out of the intermediate section having a small cross section with respect to the middle section having a large cross section. is there.

  The lattice boom of the mobile crane described in claim 1 of the present application is in an inclined state between four main column members arranged at corners of a rectangular cross section and adjacent main column members among the main column members. In a lattice boom of a mobile crane, comprising an intermediate section of a lattice structure composed of an auxiliary diagonal member arranged in the above, and a longitudinal end portion of the intermediate section being connectable to each other. A second intermediate section having a cross-sectional dimension that can be inserted into one intermediate section, and a lower surface side of the second intermediate section that is disposed on the lower surface of the end portion on the side where the second intermediate section of the first intermediate section is inserted. A first guide roller for rotationally supporting the main pillar material of the book, a guide rail arranged in parallel with the main pillar material on the inner surface of the lower surface of the first intermediate section, and a tip when the second intermediate section is inserted Characterized by comprising a second guide roller disposed on the lower surface of the end portion rotatably supporting the second intermediate section distal to roll on the guide rails, the.

  Furthermore, the lattice boom of the mobile crane described in claim 2 of the present application is characterized in that the guide rail also serves as a vertical member of a working ladder disposed inside the first intermediate section.

  The lattice boom of the mobile crane described in claim 1 of the present application is configured such that the second intermediate section is provided by a first guide roller disposed on a lower surface of an end portion on the side where the second intermediate section of the first intermediate section is inserted. Two main pillar members on the lower surface side are rotatably supported, and a guide rail arranged in parallel with the main pillar member on the inner surface of the lower surface side of the first intermediate section is inserted on the front end side end when the second intermediate section is inserted. The second guide roller disposed on the lower surface of the part rolls to rotatably support the tip of the second intermediate section. As described above, since the two guide rollers are divided into the intermediate section having the large cross section and the intermediate section having the small cross section, the apparatus can be simpler than the conventional apparatus. In addition, two guide rollers are divided into a large cross-section intermediate section and a small cross-section intermediate section to support the small cross-section intermediate section. There is no need to suspend and support, and the work becomes easy.

  In the lattice boom of the mobile crane described in claim 2 of the present application, since the guide rail also serves as a vertical member of a working ladder disposed inside the first intermediate section, a dedicated guide rail is not installed. The effect similar to the lattice boom described in claim 1 can be obtained. Therefore, the entire apparatus can be simplified.

  In FIG. 1, the mobile crane 2 provided with the lattice boom 1 which concerns on embodiment of this invention is shown. The mobile crane 2 has a swivel 5 mounted on a traveling vehicle body 4 provided with an outrigger 3 so as to be capable of swiveling. A telescopic boom 6 is pivotally supported on the swivel base 5 so as to be raised and lowered, and is driven to rise and fall by a raising and lowering cylinder 7. FIG. 1 shows a kind of jib called a luffing jib, and the jib body 1 of the luffing jib 9 constitutes a lattice boom. The jib body 1 (lattice boom) is rotatably connected to the tip of a jib support 8 that is detachable from the tip of the telescopic boom 6.

  Reference numeral 10 denotes a first mast that is pivotally supported at the tip of the jib support 8 so as to be rotatable in the jib undulation surface, and 11 is a second mast that is also pivotally supported by the jib support 8. Reference numeral 12 denotes a jib tension member that connects the tip of the jib main body and the tip of the first mast 10, and reference numeral 13 denotes an inter-mast tension member that connects the tip of the first mast 10 and the tip of the second mast 11. Reference numeral 14 denotes a boom portion tension member for connecting the tip of the second mast 11 and the air sheave 15. A wire 18 fed from a winch 17 installed at the rear part of the swivel base 5 is reciprocated between the aerial sheave 15 and the fixed sheave 16 of the swivel base 5, and the tip thereof is the swivel base 5 or the air. Connected to the sheave 15. The back tension mechanism of the luffing jib 9 is constituted by the first mast 10, the second mast 11, the jib tension member 12, the inter-mast tension member 13, the boom portion tension member 14, the aerial sheave 15, the fixed sheave 16, the winch 17 and the wire 18. It is configured. Then, by operating the winch 17, the jib body 1 is driven up and down around the pivot point at the tip of the jib support 8.

  The jib body 1 is configured by connecting a necessary number of intermediate sections 22 to a proximal end section 20 and connecting a distal end section 21 to the most advanced intermediate section 22. The intermediate section 22 is configured by connecting an intermediate section 23 having a large cross section (first intermediate section) and an intermediate section 24 having a small cross section (second intermediate section). Reference numeral 25 denotes a connection section for connecting the first intermediate section 23 and the second intermediate section 24 having different cross-sectional sizes.

  FIG. 2 shows a state when the operation of inserting the second intermediate section 24 into the first intermediate section 23 is started. The first intermediate section 23 includes four main pillar members 33 arranged at corners of a rectangular cross section, and auxiliary slopes disposed in an inclined state between adjacent main pillar members 33 of the main pillar members 33. The lattice structure is composed of the material 34. Intermediate section connecting pieces 35 and 36 are disposed at both ends of the main column member 33. Similarly, the second intermediate section 24 is disposed in an inclined state between the four main column members 37 arranged at the corners of the rectangular cross section and the adjacent main column members 37 among the main column members 37. The lattice structure is composed of the auxiliary diagonal member 38. Intermediate section connecting pieces 39 and 40 are disposed at both ends of the main column member 37.

  The first intermediate section 23 is placed on the ground, and the second intermediate section 24 is suspended from a telescopic boom tip of a crane truck (not shown) on a suspension ring 30 provided at an intermediate position in the longitudinal direction. A cargo wire 31 is connected and slightly lifted from the ground by winding up the winch of the crane vehicle. The first intermediate section 23 and the second intermediate section 24 are arranged so as to be on the same straight line in plan view. As apparent from FIG. 2, the cross-sectional dimension of the second intermediate section 24 is a dimension that can be inserted into the first intermediate section 23.

  Reference numeral 50 denotes a first guide roller disposed on the lower surface of the end of the first intermediate section 23 on the side where the second intermediate section 24 is inserted. Reference numeral 51 denotes a guide rail disposed on the inner surface on the lower surface side of the first intermediate section 23. Reference numeral 52 denotes a second guide roller disposed on the lower surface of the end portion 44 that becomes the distal end side when the second intermediate section 24 is inserted.

  Reference numeral 32 denotes an end of the first intermediate section 23 on the side where the second intermediate section 24 is inserted. Normally, the middle section end is provided with diagonal connecting members that diagonally connect the two main pillars on the diagonal among the four main pillars arranged at the corners of the rectangular cross section. In the state 2, the diagonal connecting material is removed from the end portion 32 on the side to be inserted. For this purpose, the first intermediate section 23 may be configured so that sufficient strength can be ensured without an oblique connecting material, or when the second intermediate section 24 is inserted with the oblique connecting material as a removable type. It is good also as a structure which removes only.

  3 is a cross-sectional view of the first intermediate section 23 shown in FIG. Reference numeral 43 denotes a working ladder disposed inside the first intermediate section 23. Reference numeral 41 denotes a pair of vertical members of the working ladder 43, which are arranged on the lower surface side inner surface of the first intermediate section 23 in parallel with the main pillar member 33. Reference numeral 42 denotes a transverse member arranged at equal intervals between the longitudinal members 41 arranged in parallel. The work ladder 43 is used for a worker to ascend and descend when connecting the intermediate section connecting pieces 35 and 36 with the intermediate section 23 suspended vertically (referred to as “standing”). Is done. In the present embodiment, the vertical member 41 of the working ladder 43 functions as the guide rail 51 described in claim 1 of the present invention. The working ladder 43 described above is arranged on the inner surface side of the auxiliary diagonal member 34 constituting the first intermediate section 23.

  Hereinafter, the operation of inserting the second intermediate section 24 into the first intermediate section 23 will be described. While the operator 53 controls the end of the second intermediate section 24 in the state shown in FIG. 2, the second section is operated by operating a mobile crane (not shown) while the intermediate section 24 is suspended by the lifting wire 31. The end 44 of the intermediate section 24 is inserted close to the end 32 of the first intermediate section 23.

  FIG. 4 shows a process in the middle of the operation of inserting the second intermediate section 24 into the first intermediate section 23. About half of the second intermediate section 24 is inserted into the first intermediate section 23. In this state, the center of gravity of the second intermediate section 24 is on the first guide roller 50 disposed at the end 32 of the first intermediate section 23, so that the second load even if the load wire 30 is removed from the suspension ring 30. The intermediate section 24 can maintain a stable posture with respect to the first intermediate section 23.

  FIG. 5 is a view taken in the direction of arrow B in FIG. Reference numeral 54 denotes an end vertical member arranged in communication with the main pillar members 33 at the end 32 of the first intermediate section. Reference numeral 55 denotes an end portion horizontal member arranged in communication with the main pillar members 33 at the end portion 32 of the first intermediate section. The first guide roller 50 is composed of a pair of rollers 56 and 56 arranged on the left and right. The roller 56 is provided with a support surface along the outer periphery of the main column member 37 of the second intermediate section 24, and is rotatably supported by a support shaft 57 disposed horizontally between the end vertical member 54 and the end horizontal member 55. Has been. With such a configuration, the end portion 32 of the first intermediate section 23 can be smoothly inserted in the longitudinal direction of the first intermediate section 23 while being supported so that the second intermediate section 24 does not move laterally.

  6 is a view taken in the direction of arrow C in FIG. Reference numeral 60 denotes an end vertical member disposed at the end 44 of the second intermediate section so as to connect the main pillar members 37 to each other. Reference numeral 61 denotes an end portion horizontal member disposed in communication with the main pillar members 37 at the end portion 44 of the second intermediate section. The second guide roller 52 includes a pair of rollers 63 and 63 that are rotatably supported by a support shaft 62 that is horizontally disposed below the end lateral member 61. The roller 63 has a support surface that comes into contact with the vertical member 41 of the aforementioned working ladder 43, and a flange is formed on the outer side thereof. With such a configuration, the end portion 44 of the second intermediate section 24 can be smoothly inserted in the longitudinal direction of the first intermediate section 23 while being supported so as not to move laterally. The configuration of the combination of the guide rail and the second guide roller is not limited to that of the above-described embodiment. For example, the guide roller has one guide rail, and the guide roller has left and right flanges. By doing so, a similar guide function can be provided.

  From the state shown in FIG. 4, the hanging wire 31 is removed from the hanging ring 30 of the second intermediate section 24. At this time, since the second intermediate section 24 is supported by the first guide roller 50 and the second guide roller 52 as described above, the operator 53 can easily perform the first intermediate section 24 only by pushing the second intermediate section 24. It can be inserted inside one intermediate section. FIG. 7 shows a state in which the second intermediate section 24 is completely inserted into the first intermediate section 23.

  As described above, the lattice boom of the mobile crane of the present invention has two guide rollers divided into a large cross-section intermediate section and a small cross-section intermediate section. it can. In addition, two guide rollers are divided into a large cross-section intermediate section and a small cross-section intermediate section to support the small cross-section intermediate section. There is no need to suspend and support it, and the work becomes easy.

It is the figure which showed the mobile crane 2 provided with the lattice boom 1 which concerns on embodiment of this invention. The state when the operation of inserting the second intermediate section 24 into the first intermediate section 23 is started is shown. FIG. 3 is a cross-sectional view of the first intermediate section 23 shown in FIG. The process in the middle of the operation | work which inserts the 2nd intermediate section 24 in the 1st intermediate section 23 is shown. It is a B arrow view of FIG. It is C arrow line view of FIG. The state in which the second intermediate section 24 is completely inserted into the first intermediate section 23 is shown.

Explanation of symbols

1: Lattice boom (jib body)
22: intermediate section 23: first intermediate section 24: second intermediate section 41: vertical member 43: ladder for work 50: first guide roller 51: guide rail 52: second guide roller

Claims (2)

An intermediate lattice structure comprising four main column members arranged at the corners of a rectangular cross section and auxiliary diagonal members arranged in an inclined state between adjacent main column members among the main column members. In a lattice boom of a mobile crane provided with a section, the longitudinal ends of the intermediate section being connectable,
A first intermediate section; a second intermediate section having a cross-sectional dimension that can be inserted into the first intermediate section; and a second intermediate section disposed on a lower surface of the end portion on the side where the second intermediate section is inserted. A first guide roller for rotating and supporting two main pillar members on the lower surface side of the intermediate section; a guide rail arranged in parallel with the main pillar member on the inner surface of the lower surface side of the first intermediate section; and the second intermediate member A lattice boom for a mobile crane, comprising: a second guide roller disposed on the lower surface of the end portion on the front end side when the section is inserted, and rolling on the guide rail to rotatably support the end of the second intermediate section. . The lattice boom for a mobile crane according to claim 1, wherein the guide rail also serves as a vertical member of a working ladder disposed inside the first intermediate section.

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