JP2010275036A - Tension link housing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the housing property and the conveyance property while maintaining the strength performance of a lattice jib in a housing structure for storing a tension link on the upper surface side of the lattice jib. <P>SOLUTION: A link loading stand 41 and a link fixing means 42 for fixing a tension link 14 loaded on the link loading stand 41 are provided on the upper surface side of a lattice jib 2. During the conveyance or the housing of the lattice jib 2, the tension link 14 is fixed in a horizontal posture. Then, the occupied space of the tension link 14 on the upper surface side of the lattice jib 2 is reduced more compared with the case, for example, the tension link 14 is fixed in a vertical posture, the height of the entire lattice jib 2 including the tension link 14 is also reduced, and the conveyance property or the housing property of the lattice jib 2 is enhanced. Further, during the assembly/disassembly of the lattice jib 2 and the tension link 14, the tension link 14 is set in a vertical posture to facilitate the assembly/disassembly. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tension link storage structure in the case where the tension link is stored on the upper surface side of the lattice jib when the lattice jib is transported or stored.

  For example, for crane operations that require a high lift and a large working radius, a luffing jib composed of a lattice-shaped jib is connected to the tip of a boom that can be raised and lowered, and the luffing jib is connected to a tension link. A mobile crane with a luffing jib that is lifted by a tension device is used (see, for example, Patent Document 1 and Patent Document 2). In addition to the luffing jib having a lattice structure, there is also a mobile crane with a luffing jib having a boom having a lattice structure (see Patent Document 3).

  (A) By the way, it is necessary to change and set the length of such a luffing jib according to the working conditions. In such a case, the luffing jib is divided into a proximal-side lattice and a distal-side lattice jib, and both A split structure composed of intermediate lattice jibs of a predetermined length having the same rectangular cross-section that can be connected between them, and the length is adjusted by connecting the required number of intermediate lattice jibs. Yes. In this case, the length of each divided portion is determined in consideration of transportation by the vehicle.

  In addition, if the length of the luffing jib is long, and the jib cross-sectional shape is the same over the entire length, the weight increases and it is disadvantageous in terms of crane work performance. It is also known that the intermediate lattice jib constituting the portion closer to the proximal end of the luffing jib has a larger cross-sectional shape and the intermediate lattice jib constituting the portion closer to the distal end has a smaller cross-sectional shape (see Patent Document 2).

  In addition, as shown in Patent Document 3, in a case having a lattice-structured boom, the cross-sectional shape of the boom is corresponding to the difference in load conditions between the boom and the luffing jib connected to the tip thereof. It is set larger than the cross-sectional shape of the intermediate lattice jib in the luffing jib (see Patent Document 3).

  (B) On the other hand, the luffing jib is connected to the tip of the boom so that it can be raised and lowered. In this case, one end of the tension link is connected to the tip of the luffing jib for holding and raising the luffing jib, The other end side of the tension link is connected to a mast arranged upright at the tip of the boom, and the mast is tilted by a tension wire fed from a winch arranged on the vehicle side (Patent Documents 1 to 3). (See Patent Document 3).

  In this case, the tension link is also divided into a plurality of parts corresponding to the respective lattice jibs in consideration of transportability, disassembly and assembly, and the divided tension links are connected and used at the time of use. Further, when the luffing jib is divided and stored or transported, the tension links are also divided and stored on the upper surface of the corresponding intermediate lattice jib (see Patent Document 1).

  The tension link is configured by attaching link connecting bosses used for connection with other tension links to both ends of a straight link body having a predetermined length. In this case, the link connecting boss is composed of one or two plates, and a pin hole is provided in a portion extending outward from the end of the link body. The strength of the pin hole portion From the viewpoint of securing, it has a relatively large planar shape, and when viewed in the axial direction of the tension link, the outer edge portion of the link connecting boss extends outward from the outer peripheral surface of the link body ( That is, the width dimension of the link connecting boss is larger than the outer diameter dimension of the link body (see Patent Document 1).

  When the tension link is stored on the upper surface of the intermediate lattice jib, the link connecting boss is arranged so that the link connecting boss is substantially perpendicular to the upper surface of the lattice jib in consideration of disassembly and assembly of the tension link. Usually, the boss is fixed in a standing posture (hereinafter referred to as “vertical posture”) (see Patent Document 1). In addition, in this case, considering the workability at the time of disassembly and assembly with other tension links, that is, workability in inserting / removing the connecting pins to the link connecting bosses, the upper surface of the intermediate lattice jib and the tension links A relatively large gap is secured between the lower surface.

  (C) The luffing jib is disassembled when stored or transported as described above, and stored or transported in this disassembled state. In this case, in particular, the intermediate lattice jib has the same cross-sectional shape over its entire length, but since the inside is hollow, its volume effect is very high when storing and transporting them alone. Low and uneconomical. From such a viewpoint, as shown in Patent Document 2, in an intermediate lattice jib with a small cross-sectional shape and an intermediate lattice jib with a large cross-sectional shape, an intermediate lattice jib with a small cross-sectional shape is placed in the intermediate lattice jib with a large cross-sectional shape. In addition, as shown in Patent Document 3, in an intermediate lattice jib having a small cross-sectional shape and a lattice boom having a large cross-sectional shape, the intermediate lattice jib having a small cross-sectional shape is stored in a lattice boom having a large cross-sectional shape. The volume effect at the time of storage and transportation is enhanced.

JP-A-9-58977 JP 2007-302428 A JP 2003-118980 A

  However, in the conventional structure as described above, when the tension link is stored on the upper surface of the intermediate lattice jib, the tension link having a small cross-sectional shape is stored in the intermediate lattice jib having a large cross-sectional shape while the tension link is stored on the upper surface. In both cases, there were the following problems.

  (A) When the tension link is stored on the upper surface of the intermediate lattice jib, as described above, the tension link is fixed in a vertical posture in which the link connecting boss is substantially orthogonal to the upper surface of the intermediate lattice jib. According to the retracted posture, the total height of the tension link is determined not by the height of the upper surface of the link body, but by the height of the upper surface of the link connecting boss extending further upward from the upper surface of the link body. . The tension link is provided with a relatively large gap between the upper surface of the intermediate lattice jib in consideration of workability during disassembly and assembly.

  As a result, in the state where the tension link is stored on the upper surface of the intermediate lattice jib, the tension link greatly extends upward from the upper surface of the intermediate lattice jib, and includes the tension link that is handled as a unit during storage or transportation. The height of the entire intermediate lattice jib increases, so that it is necessary to secure a relatively large space occupied by the tension link on the upper surface side of the intermediate lattice jib, and the storage performance and the transportability deteriorate accordingly.

  (B) When an intermediate lattice jib with a small cross-sectional shape is stored in an intermediate lattice jib with a large cross-sectional shape while a tension link is stored on the upper surface, the height of the entire intermediate lattice jib with a small cross-sectional shape is increased due to the presence of the tension link. Therefore, the gap between the inner surface of the intermediate lattice jib having a large cross-sectional shape located on the outer side and the tension link stored on the upper surface of the intermediate lattice jib having a small cross-sectional shape located on the inner side is reduced. As a result, when inserting / removing the intermediate lattice jib having a small cross-sectional shape into / from the intermediate lattice jib having a large cross-sectional shape, there is a concern that both of them come into contact with each other and cause damage, and the above insertion / removal operation is gradually performed to avoid such damage. In addition, when the process is performed while paying more attention than necessary, the workability is lowered.

  Conversely, if the gap between the upper inner surface of the intermediate lattice jib with a large cross-sectional shape and the tension link on the side of the intermediate lattice jib with a small cross-sectional shape is increased to increase the work space, the amount of the work space is increased by the above amount. Although it is necessary to reduce the height of the intermediate lattice jib with a small cross-sectional shape, such a decrease in height leads to a decrease in the strength performance of the intermediate lattice jib with a small cross-sectional shape, and consequently the strength performance of the entire luffing jib. Will also lead to a decline.

  Accordingly, in view of the above problems, the present invention aims to improve the storage performance and transportability of the tension link storage structure in which the tension link is stored on the upper surface side of the lattice jib while maintaining the strength performance of the lattice jib. It was made as.

  In the present invention, the following configuration is adopted as a specific means for solving such a problem.

  In the first invention of the present application, a tension is formed by providing link connecting bosses on both sides of the straight link body on the upper surface side of the lattice jib so as to extend radially outward from the outer peripheral surface of the link body. In the storage structure of the tension link for storing the link, on the upper surface side of the lattice jib, the link mounting table on which the tension link is mounted, and the tension link mounted on the link mounting table is connected to the link connecting boss. Link fixing means for fixing the lattice jib in a horizontal posture substantially parallel to the upper surface of the lattice jib is provided.

  In the second invention of the present application, in the tension link storage structure according to the first invention, the link mounting table is positioned higher than the first link mounting table and the mounting surface of the first link mounting table. A second link mounting table having a mounting surface on the side, and the tension link is substantially parallel to the upper surface of the lattice jib when the tension link is mounted on the first link mounting table. The horizontal fixing posture is fixed in the posture by the link fixing means, and the link connecting boss can be in a vertical posture substantially orthogonal to the upper surface of the lattice jib in the mounting state on the second link mounting table. It is characterized by that.

  In a third invention of the present application, in the tension link storage structure according to the first or second invention, the cross-sectional shape is larger than the outer lattice jib in the outer lattice jib having a larger cross-sectional shape in which the tension link is stored on the upper surface. The inner lattice jib with a small size is housed in a state where the tension link is stored on the upper surface thereof, and the tension link stored on the outer lattice jib side and the tension link stored on the inner lattice jib side are both It is characterized in that it is set in a horizontal posture and fixed in that posture by the link fixing means.

  In the present invention, the following effects can be obtained.

  (A) According to the tension link storage structure according to the first invention of the present application, on the upper surface side of the lattice jib, the link mounting table on which the tension link is mounted, and the above-mentioned mounted on the link mounting table The tension link is provided with a link fixing means for fixing the tension link in a horizontal posture in which the link connecting boss is substantially parallel to the upper surface of the lattice jib, so that the tension link is fixed in the horizontal posture when the lattice jib is transported or stored. Thus, for example, the space occupied by the tension link in the height direction on the upper surface side of the lattice jib as compared to a case where the link connecting boss is fixed in a vertical posture substantially orthogonal to the upper surface of the lattice jib. Therefore, the height of the lattice jib as a whole including the tension link is also reduced, and as a result, the lattice Only the amount of decrease in the overall height so that transportability or storage of the Rachisujibu is improved.

  Further, when disassembling / assembling the lattice jib and the tension link, the fixing action by the link fixing means is released, and the tension link is set to the vertical posture so that the lattice jib and the tension link can be easily disassembled / assembled. Can be done.

  (B) According to the tension link storage structure according to the second invention of the present application, in addition to the effect described in (a) above, the following specific effect is obtained. That is, according to the present invention, the link mounting table includes a first link mounting table and a second link mounting table having a mounting surface higher than the mounting surface of the first link mounting table. When the tension link is mounted on the first link mounting table, the link connecting boss is set in the horizontal posture substantially parallel to the upper surface of the lattice jib and fixed in the posture by the link fixing means. In the mounting state on the second link mounting table, the link connecting boss can be in a vertical posture substantially perpendicular to the upper surface of the lattice jib.

  Accordingly, when the lattice jib is assembled, the fixing action of the link fixing means is released, the tension link is transferred from the first link mounting table to the second link mounting table, and the vertical posture (i.e., (The posture in the use state), for example, as compared with the case where the tension link is placed on the first link mounting table and is in a vertical posture, the tension link from the upper surface of the lattice jib. The height becomes higher, the work space when the tension link is connected to another tension link is expanded, and the workability is improved.

  On the other hand, when the lattice jib is transported or stored, the tension link is transferred from the second link mounting table side to the first link mounting table side, and is set in a horizontal posture, so that the first The height of the tension link on the upper surface side of the lattice jib due to both the height difference of the mounting surface of the link mounting table and the second link mounting table and the total height difference between the vertical posture and the horizontal posture of the tension link. The occupied space in the direction is reduced. As a result, the overall height of the lattice jib including the tension link is lowered, and the transportability or storage property of the lattice jib is improved accordingly.

  As a synergistic effect, both the assembling property at the time of assembling the lattice jib, the transportability and the storing property of the lattice jib are improved.

  (C) According to the tension link storage structure according to the third invention of the present application, in addition to the effects described in the above (a) or (b), the following specific effects can be obtained. That is, in the present invention, the inner lattice jib having a smaller cross-sectional shape than the outer lattice jib is accommodated in the outer lattice jib having a larger cross-sectional shape in which the tension link is stored on the upper surface thereof, with the tension link being stored on the upper surface. In the configuration, the tension link stored on the outer lattice jib side and the tension link stored on the inner lattice jib side are both set to the horizontal posture and fixed in the posture by the link fixing means. Yes.

  (C-1) Accordingly, when the lattice jib is transported or stored, the tension link is set to the horizontal posture on the link mounting table on the outer lattice jib side (in the case of the configuration of the first invention) ), Or the tension link is placed on the first link mounting table and set in the horizontal posture (in the case of the configuration of the second invention), in any of these cases, the tension The height of the link from the upper surface of the inner lattice jib is lowered, and accordingly, the height of the entire inner lattice jib including the tension link is also lowered, and the lattice jib can be transported and stored by the reduced amount of the height. Will be improved.

  In particular, in the case of the configuration of the second invention, the height of the first link mounting table on which the tension link is mounted is lower than the height of the link mounting table in the configuration of the first invention. Accordingly, the height of the entire inner lattice jib including the tension link is further reduced by the difference in height of the link mounting table as compared with the case of the configuration of the first invention, and the transportability and storage performance of the lattice jib are further reduced. It will be further improved.

  (C-2) On the other hand, in the state where the inner lattice jib is housed in the outer lattice jib, the height of the inner lattice jib as a whole can be kept low by setting the tension link in the horizontal posture. For example, as compared with the case where the inner lattice jib is stored in the outer lattice jib while the tension link is set in the vertical posture, the gap between the tension link and the inner surface of the outer lattice jib is larger. Enlarged. Therefore, when the inner lattice jib is inserted into and removed from the outer lattice jib due to the widening of the gap, even if the inner lattice jib swings up and down somewhat, it is possible to prevent the two from coming into contact with each other as much as possible. In addition, the inner lattice jib can be inserted into and removed from the outer lattice jib without worrying about such contact, and workability in the insertion / removal operation is improved.

  (C-3) Also, in the state where the inner lattice jib is housed in the outer lattice jib, the tension link is set to the horizontal posture, so that the height of the entire inner lattice jib is suppressed to be inserted and removed. For example, in the case where the inner lattice jib is housed in the outer lattice jib while the tension link is set in a vertical posture, damage during insertion / removal work can be avoided. In order to avoid this, there is no need to reduce the cross-sectional shape of the inner lattice jib to enlarge the gap between the tension link and the inner surface of the outer lattice jib, and the strength performance of the inner lattice jib is high. The strength performance of the luffing jib configured by connecting the lattice jib can be ensured.

It is a general view of the mobile crane with a lattice jib. It is a top view of the lattice jib provided with the storage structure of the tension link which concerns on 1st Embodiment of this invention. It is the III-III arrow line view of FIG. It is the IV-IV arrow line view of FIG. It is an enlarged view of the V section of FIG. It is a top view in the state where a lattice jib with a small cross-sectional shape was stored in a lattice jib with a large cross-sectional shape. It is a VII-VII arrow line view of FIG. It is a VIII-VIII arrow line view of FIG. It is an enlarged view of the IX part of FIG. It is XX expansion arrow line view of FIG. It is an enlarged view of the XI part of FIG. It is an enlarged view of the XII part of FIG. It is a top view of the lattice jib provided with the storage structure of the tension link which concerns on 2nd Embodiment of this invention. It is a XIV-XIV arrow line view of FIG. It is a XV-XV arrow line view of FIG. It is an enlarged view of the XVI part of FIG. It is a top view in the state where a lattice jib with a small cross-sectional shape was stored in a lattice jib with a large cross-sectional shape. It is the XVIII-XVIII arrow line view of FIG. It is a XIX-XIX arrow line view of FIG. It is an enlarged view of the XX part of FIG.

A-1: Overall Configuration FIG. 1 shows a mobile crane Z with a luffing jib to which a tension link storage structure according to the present invention is applied.

  The mobile crane Z is mounted on a swivel base 102 that is turnable on a vehicle 101 so that the telescopic boom 103 can be raised and lowered, and is driven by the boom hoisting cylinder 110 to move up and down. In addition, a luffing jib 105 is attached via a jib base 104.

  The luffing jib 105 is configured by connecting a plurality of lattice jibs having a lattice structure. That is, the luffing jib 105 includes a base end jib 1 connected to the jib base 104, a first lattice jib 2 and a second lattice jib 3 sequentially connected to the tip of the base end jib 1, and the second A reducer 4 connected to the tip of the lattice jib 3, a third lattice jib 5 and a fourth lattice jib 6 sequentially connected to the tip of the reducer 4, and a jib head 7 connected to the tip of the fourth lattice jib 6. It is configured with.

  Here, the first lattice jib 2 and the second lattice jib 3 are “lattice jib having a large cross-sectional shape” in claims, and correspond to “outer lattice jib” during storage and transportation. The third lattice jib 5 and the fourth lattice jib 6 are “lattice jib having a small cross-sectional shape” in the claims, and correspond to “inner lattice jib” during storage and transportation. The luffing jib 105 has its jib length adjusted by changing the number of connections of the first and second lattice jibs 2 and 3 and the third and fourth lattice jibs 5 and 6.

  The luffing jib 105 is lifted by a tension winch 115 on the swivel base 102 side via a tension link 108, and is held at a required lifting position.

  The tension link 108 includes a first tension link 11 having one end connected to a first mast 106 disposed on the jib base 104, and a front side of the first mast 106 and the first mast 106. A second tension link 12 connected between the arranged second masts 107, and a third tension link 13 to an eighth tension link connected between the second mast 107 and the jib head 7. 18.

  An air sheave 117 is connected to the other end of the first tension link 11, and a tension wire 113 from the tension winch 115 is wound around the air sheave 117. The first tension link 11 and the second tension link 12 are stored and held on the base end jib 1 side together with the masts 106 and 107 when the luffing jib 105 is stored.

  On the other hand, the third tension link 13 to the eighth tension link 18 connected between the second mast 107 and the jib head 7 are divided corresponding to the division form of the luffing jib 105. When the luffing jib 105 is stored, it is stored on the corresponding lattice jib side. That is, the third tension link 13 is on the proximal jib 1 side, the fourth tension link 14 is on the first lattice jib 2 side, and the fifth tension link 15 is on the second lattice jib 3 side. In addition, the sixth tension link 16 is on the reducer 4 side, the seventh tension link 17 is on the third lattice jib 5 side, and the eighth tension link 18 is on the fourth lattice jib 6 side. Each is stored. Among these tension links 13 to 18, the third tension link 13, the fourth tension link 14, the seventh tension link 17, and the eighth tension link 18 are stored in the respective lattice jibs corresponding to the respective tension links 13 to 18. Each invention of this application is applied to the storage structure at that time. The tension link storage structure will be specifically described below.

A-2: Storage form of the luffing jib 105 The luffing jib 105 is stored in a divided state. That is, when the luffing jib 105 is stored, the base jib 1, the first lattice jib 2, the second lattice jib 3, the reducer 4, the third lattice jib 5, the fourth lattice jib 6 and the jib head 7 are included. Is broken down into

  The proximal end jib 1 is separated from the luffing jib 105 together with the first mast 106 and the second mast 107 and the first tension link 11 and the second tension link 12, and is stored and transported integrally. Is done.

  The first lattice jib 2, the second lattice jib 3, the third lattice jib 5, and the fourth lattice jib 6 are separated from each other. At this time, as described later, the third lattice jib 2 corresponds to the upper surface side. The tension link 13, the fourth tension link 14, the seventh tension link 17, and the eighth tension link 18 are stored in a mounted state.

  Here, the first lattice jib 2, the second lattice jib 3, the third lattice jib 5, and the fourth lattice jib 6 are all shaped having the same cross-sectional shape over their entire length, Needless to say, the third lattice jib 5 and the fourth lattice jib 5 and the fourth lattice jib 5 having a small cross-sectional shape can be accommodated in the first lattice jib 2 and the second lattice jib 3 having a large cross-sectional shape. The first lattice jib 2, the third lattice jib 5, the second lattice jib 3, and the fourth lattice jib 6 can be integrally stored or transported.

  The present invention proposes a tension link storage structure effective in any of these forms. Hereinafter, the storage structure of the tension link will be described for each of the first and second embodiments.

B: First Embodiment In the first embodiment, among the lattice jibs 2, 3, 5 and 6 of the luffing jib 105, the first lattice jib 2 having a large cross-sectional shape is included in the first lattice jib 2 having a small cross-sectional shape. For example, when the third lattice jib 5 is stored in an interpolated state, the storage structure of the fourth tension link 14 in the first lattice jib 2 and the seventh tension link 17 in the third lattice jib 5 are stored. Each storage structure will be described.

B-1: Configuration of the First Lattice Jib 2 FIGS. 2 to 5 show a state where the fourth tension link 14 is stored in the first lattice jib 2.

  As shown in FIGS. 2 to 4, the first lattice jib 2 is a frame-like column having a rectangular cross-sectional shape as a whole, and is arranged to be positioned at each of the four vertices of the rectangle. A main material 21 having a predetermined length, a connecting material 22 for connecting the four main materials 21 at both ends thereof, and a main material 21 adjacent to four side portions formed between the four main materials 21. The diagonal members 23 are arranged so as to be inclined in a zigzag manner so as to straddle each other.

B-2: Structure for accommodating the third lattice jib 5 The first lattice jib 2 is provided with a member for accommodating the third lattice jib 5 in an inserted state therein, as will be described later. It has been.

  That is, as shown in FIG. 4, the end diagonal member 29 is arranged only at one of the two ends of the first lattice jib 2 (the tip in this embodiment), and the other (in this embodiment). The base end portion is not provided with an end diagonal member 29, and is formed into a rectangular opening for inserting and removing the third lattice jib 5 into and from the first lattice jib 2.

  A first jib connecting boss 31 is provided at the base end of each main material 21 of the first lattice jib 2, and a second jib connecting boss 32 is provided at the tip.

  Further, the end diagonal member 29 on the distal end side of the first lattice jib 2 has a distal end of the third lattice jib 5 accommodated in the first lattice jib 2 as shown in FIGS. Is provided with a stopper 36 that engages and restricts movement thereof. As shown in FIGS. 2 and 3, the connecting member 22 on the upper surface side of the base end portion of the first lattice jib 2 is connected to the first lattice jib 2 stored in the first lattice jib 2 as will be described later. A bracket 55 for suspending and supporting the base end portion of the three lattice jibs 5 is provided.

  Further, as shown in FIGS. 3 and 4, a pair of left and right guide rails 30 are provided over the entire length of the first lattice jib 2 inside the lower surface of the first lattice jib 2. Further, as shown in FIGS. 7 and 10, on both sides of the lower surface of the base end side of the first lattice jib 2, the jib receiver that receives the third lattice jib 5 to be described later is inserted and removed as necessary. A stand 47 is provided.

B-3: Structure for storing the fourth tension link 14 On the other hand, the first lattice jib 2 is provided with a member for storing the fourth tension link 14 on the upper surface side thereof.

  That is, as shown in FIGS. 1 and 2, the upper surface of the first lattice jib 2 includes a proximal-side work stage 24 located on the proximal side, a distal-side work stage 25 located on the distal side, and these A walking stage 26 straddling the work stages 24 and 25 is provided. Link support members 27 are arranged laterally at the end portion on the inner side in the jib axis direction of the proximal end side work stage 24 and the end portion on the inner side in the jib axis direction of the distal end side work stage 25. 4 and 5, the link support member 27 is formed of a mold material, and at two positions separated by a predetermined dimension in the longitudinal direction (that is, the width direction of the first lattice jib 2 in a plan view), Each of the link mounting tables 41 is provided with a stopper 43 on each side of the link mounting table 41.

  As shown in FIG. 5, the height of the link mounting table 41 is such that a fourth tension link 14 (to be described later) is connected to the first link connecting boss 33 and the second link connecting boss 33 respectively provided at both ends thereof. When the link connection bosses 34 are placed in a posture that is substantially orthogonal to the upper surface of the first lattice jib 2, the link connection bosses 33, 34 are equal to or higher than the link support member 27. So as to correspond to the size of each of the link connecting bosses 33 and 34.

  Further, as shown in FIGS. 2 to 5, the fourth tension link 14 is fixed to the connecting member 22 located on the top surface of the tip end of the first lattice jib 2 using a fixing pin 42 (see FIG. 9). A link fixing bracket 40 is provided.

B-4: Structure of Fourth Tension Link 14 The fourth tension link 14 is a link body made of a straight tube shorter than the first lattice jib 2 by a predetermined length as shown in FIGS. The first link connecting boss 33 made of two plates and the second link connecting boss 34 made of a single plate are respectively attached to both ends. In this case, the link connecting bosses 33 and 34 are set to have the same mounting direction with respect to the circumferential direction of the link main body, and the outer edge portion of the fourth tension link 14 is viewed in the axial direction. The link body extends outward from the outer peripheral surface of the link body. Further, the first link connecting boss 33 and the second link connecting boss 34 of the fourth tension link 14 have a handle 35 used when the fourth tension link 14 is manually rotated. Is provided.

  In this embodiment, the first link connecting boss 33 is composed of two plates, and the second link connecting boss 34 is composed of a single plate. The number of plate members constituting the bosses 33 and 34 is not limited to the above setting, and can be appropriately increased or decreased according to the load condition applied to the tension link.

B-5: Storage of Fourth Tension Link 14 in First Lattice Jib 2 Here, the storage of the fourth tension link 14 on the upper surface of the first lattice jib 2 will be described.

  As shown in FIG. 2, the fourth tension link 14 is stored in a mounted state on the upper surface of the first lattice jib 2. That is, the fourth tension link 14 is mounted on the link mounting table 41 provided on the pair of front and rear link support members 27. In this placement state, the fourth tension link 14 is appropriately rotated while holding the handle 35, and the link connecting bosses 33, 34 are set in the rotational direction so that the first link connection bosses 33, 34 The posture is set substantially parallel to the upper surface of the lattice jib 2 (this posture is referred to as “horizontal posture”). Then, the pin hole of the second link connecting boss 34 on the tip side of the fourth tension link 14 and the pin hole of the link fixing bracket 40 on the first lattice jib 2 side are matched in the vertical direction, By inserting the fixing pin 42 across the gap and preventing it from coming off with the split pin 44 (see FIG. 9), the movement of the fourth tension link 14 in the axial direction is restricted, and the fourth tension link 14 Is stored and fixed on the upper surface side of the first lattice jib 2.

  In the retracted state of the fourth tension link 14, the lateral swing of the fourth tension link 14 is restricted by the stopper 43 provided on the side of each link mounting table 41.

  As described above, the first lattice jib 2 in which the fourth tension link 14 is stored on the upper surface can be stored or transported in this state. However, as described later, the first lattice jib 2 can be stored. It can also be stored or transported in a state in which a later-described third lattice jib 5 is housed inside the lattice jib 2. In any of these cases, since the first lattice jib 2 is exposed to the outside, the size of the overall height affects the storage performance or the transportability.

  In this case, in this embodiment, since the fourth tension link 14 is fixed in a horizontal posture on the upper surface of the first lattice jib 2, for example, the fourth tension link 14 is connected to each link. Compared to the case in which the bosses 33 and 34 are in a posture that is substantially orthogonal to the upper surface of the first lattice jib 2 (the posture shown in FIG. 5, which is referred to as a “vertical posture”), The height of the entire first lattice jib 2 including the fourth tension link 14 is lowered by the amount that the link connecting bosses 33 and 34 do not extend upward. Storability or transportability of one lattice jib 2 is improved.

  When the first lattice jib 2 is assembled and used as a part of the luffing jib 105, the fixing pin 42 is removed and the fourth tension link 14 is rotated, as shown in FIG. Is set to a vertical posture, the pin insertion direction of each of the fourth tension links 14 with respect to the link connecting bosses 33 and 34 is set to a substantially horizontal direction, and the height position thereof is the upper surface of the first lattice jib 2. Since the working space is secured around the higher position, the fourth tension link 14 can be easily connected to other tension links, that is, the third tension link 13 and the fifth tension link 15. Can do.

B-6: Configuration of the third lattice jib 5 The third lattice jib 5 has a cross-sectional shape smaller than that of the first lattice jib 2, but its basic configuration is the same as that of the first lattice jib 2. The description about the first lattice jib 2 is used for the basic configuration, and the description here is omitted. In the following, the configuration of the portion different from the first lattice jib 2, that is, the third lattice jib 5 is described. Only the structure for housing in the first lattice jib 2 will be described. The same constituent members as those of the first lattice jib 2 are denoted by the same reference numerals as those attached to the first lattice jib 2.

  As shown in FIGS. 7, 8, and 11, a guide roller 45 is attached to the lower surface side of the tip portion of the third lattice jib 5 via a bracket 46. The guide roller 45 engages with the guide rail 30 on the first lattice jib 2 side and rolls, so that when the third lattice jib 5 is inserted into and removed from the first lattice jib 2, The tip of the third lattice jib 5 is guided.

  As shown in FIGS. 6, 7, and 12, the pair of left and right main members 21 positioned above the base end portion of the third lattice jib 5 includes a suspension hole 62 and a protruding receiving portion 60. A bracket 56 is attached. A link bar 57 is pivotally supported on the bracket 56 by a connecting pin 59. The other end of the link bar 57 can be connected to the bracket 55 provided on the base end side of the first lattice jib 2 by a connecting pin 58. Further, a stopper 61 is provided on the base end side of the link bar 57 so as to be engageable with the receiving portion 60 of the bracket 56.

  The link bar 57 connects the bracket 56 on the side of the third lattice jib 5 and the bracket 55 on the side of the first lattice jib 2 in a state where the third lattice jib 5 is housed in the first lattice jib 2. To do. That is, the third lattice jib 5 has the guide roller 45 (see FIG. 11) provided at the tip thereof facing the proximal end portion of the guide rail 30 of the first lattice jib 2. A hook of a work crane (not shown) or a wire suspended from the hook is hooked in the suspension hole 62 of the bracket 56 at the base end of the three lattice jibs 5, and the work crane 3 so that the third lattice jib 5 is levitated and supported toward the tip of the jib, so that the third lattice jib 5 enters the tip of the first lattice jib 2 and enters the first lattice jib 2. Stored.

  At this time, with the progress of the storage operation, the link bar 57 causes the third lattice jib 5 to contact the stopper 36 on the first lattice jib 2 side so that it cannot enter any further. The bracket 56 on the third lattice jib 5 side and the bracket 55 on the first lattice jib 2 side are connected, and when the connection is completed, the suspension work by the work crane is finished, and the link bar 57 The base end portion of the third lattice jib 5 is suspended and supported by the base end portion of the first lattice jib 2.

  In the suspended state of the third lattice jib 5 by the link bar 57 (the state shown in FIG. 12), the axis L1 of the link bar 57 (that is, the axial position of the connecting pin 59 and the axis of the connecting pin 58). The length of the link bar 57 and the third lattice jib so that the straight line connecting the center positions) is inclined by an angle α toward the base end side of the jib relative to the vertical line L0 passing through the axis of the connecting pin 58. The mounting position of the bracket 56 with respect to 5 is set relatively. Accordingly, in the suspended state of the third lattice jib 5 by the link bar 57, a part of the weight of the third lattice jib 5 rotates clockwise around the link bar 57 and the connecting pin 58. Acting as a rotational force to rotate in the direction, and receiving the rotational force, the direction in which the third lattice jib 5 enters the first lattice jib 2 (that is, the tip of the third lattice jib 5 is the first lattice The third lattice jib 5 is urged in the direction of being pressed toward the stopper 36 on the lattice jib 2 side, and the third lattice jib 5 is prevented from coming out of the first lattice jib 2 during storage or transport.

  Further, in the suspended state shown in FIG. 12, the stopper 61 on the link bar 57 side is relatively opposite to the receiving portion 60 on the bracket 56 side in the counterclockwise direction. The position is set. Accordingly, when the stopper 61 is engaged with the receiving portion 60, the link bar 57 is reliably restricted from rotating further counterclockwise, and the first lattice jib 2 of the third lattice jib 5 is restricted. Leaving from is prevented.

  That is, by the synergistic action of the third lattice jib 5 drop restricting action by the inclined arrangement of the link bar 57 and the third lattice jib 5 drop restricting action by the link bar 57 rotation restriction, The latch jib 5 is reliably prevented from coming off from the first lattice jib 2, and in this embodiment, the bracket 55 on the first lattice jib 2 side and the bracket on the third lattice jib 5 side are provided. 56, the link bar 57 for connecting them by the connecting pins 58 and 59, the stopper 61 for restricting the rotation of the link bar 57, and the receiving portion 60 of the bracket 56 constitute a retaining mechanism 54. The

  Thus, in the state where the third lattice jib 5 is housed in the first lattice jib 2, the retaining mechanism 54 can reliably prevent the two members from being removed, for example, in such a housed state. When this is transported by a vehicle, the first lattice jib 2 and the third lattice jib 5 do not need to be individually fixed to the vehicle side, and if either one of these is fixed to the vehicle, Is integrally fixed to the vehicle side, and the third lattice jib 5 is reliably prevented from coming out of the first lattice jib 2 during the transportation, and safety during the transportation is ensured. Further, even when the first lattice jib 2 and the third lattice jib 5 are unloaded onto the vehicle accompanying the conveyance, the third lattice jib 5 is not unintentionally pulled out from the first lattice jib 2 and unloaded. Work can be performed safely and with good workability.

B-7: Storing the third lattice jib 5 in the first lattice jib 2 As described above, the third lattice jib 5 is housed in the first lattice jib 2 at the tip of the third lattice jib 5. The guide roller 45 provided in the section and the guide rail 30 of the first lattice jib 2 are used and the working crane is used, and the storage state is held by the link bar 57. In this case, the third lattice jib 5 is accommodated in the first lattice jib 2 with the seventh tension link 17 stored on the upper surface thereof (see FIGS. 6 to 9).

  In this case, the occurrence of damage and workability due to the contact of the first lattice jib 2 and the third lattice jib 5 during the storing operation become a problem. That is, when the third lattice jib 5 is housed in the first lattice jib 2, the seventh tension stored inside the upper surface of the first lattice jib 2 and the upper surface of the third lattice jib 5. A gap between the link 17 and the upper surface is important. If the gap is too small, the third lattice jib 5 is swung in the vertical direction of the third lattice jib 5 during the storing operation of the third lattice jib 5. There is a concern that the first lattice jib 2 may come into contact with the first lattice jib 2 to cause damage.

  However, in this embodiment, since the seventh tension link 17 is set in a horizontal posture when the seventh tension link 17 is stored (see FIGS. 8 and 9), for example, the seventh tension link The height of the seventh tension link 17 from the upper surface of the third lattice jib 5 is smaller than when the vertical tension 17 is set to the vertical posture, and the seventh tension link 17 and the first lattice jib 2, the gap in the height direction between the inner surfaces of the two upper surfaces, that is, the size of the gap that can absorb the vibration displacement of the third lattice jib 5 can be sufficiently secured, and thereby the third lattice jib 5 can be secured. And the first lattice jib 2 are prevented from being damaged as much as possible. Therefore, when the third lattice jib 5 is stored in the first lattice jib 2, the workability can be improved by performing the operation without worrying about the contact between them.

  On the other hand, for example, when the seventh tension link 17 is stored on the upper surface of the third lattice jib 5 in a vertical posture, the upper surface of the third lattice link 5 of the seventh tension link 17 is Therefore, it is necessary to reduce the cross-sectional shape of the third lattice jib 5 in order to ensure the gap, but according to the configuration of this embodiment, no such countermeasure is required. The reduction in strength performance of the third lattice jib 5 due to the reduction in the cross-sectional shape of the third lattice jib 5 is avoided in advance, and the strength performance of the third lattice jib 5 can be maintained at a high level. it can.

C: Second Embodiment In the second embodiment, the first lattice jib having a large cross-sectional shape among the lattice jibs 2, 3, 5, and 6 of the luffing jib 105, as in the first embodiment. 2, the third lattice jib 5 having a small cross-sectional shape is accommodated in an interpolated state, and its basic configuration is the same as in the case of the first embodiment. The second embodiment is different from the first embodiment in the storage structure of the fourth tension link 14 on the upper surface of the first lattice jib 2. Therefore, here, this difference is different. Only the structure to be described will be described in detail, and the corresponding description of the first embodiment is referred to for the other structures and the like similar to those of the first embodiment, and the description thereof is omitted here.

C-1: Configuration of Link Placement Table FIGS. 13 to 17 show a state in which the fourth tension link 14 is stored in the first lattice jib 2, and includes the link support member 27 and the link support member 27. The first and second link mounting tables 51 and 52 arranged on the link support member 27 are shown.

  That is, on the link support member 27, the first link mounting table 51 having a low mounting surface height position and the second link mounting table 52 having a high mounting surface height position are provided on the link support. The material 27 is provided adjacent to the length direction of the material 27, and the first link mounting table 51 and the second link mounting table 52 are continuous by an inclined surface.

  The height of the mounting surface of the first link mounting table 51 from the link support member 27 is preferably set as low as possible. In some cases, the upper surface of the link support member 27 is left as it is in the first link. It can also be used as a mounting surface of the mounting table 51. On the other hand, the height of the mounting surface of the second link mounting table 52 from the upper surface of the link support member 27 is the fourth tension link 14 mounted here as shown by the chain line in FIG. In a state where the second link connection boss 34 ′ is in a vertical posture in which the second link connection boss 34 ′ is substantially perpendicular to the upper surface of the first lattice jib 2, the second link connection boss 34 ′ is supported by the link support. The upper surface of the material 27 is set to be the same as or higher than the upper surface.

  A stopper 43 having a low height is provided on the side of the first link mounting table 51, and a stopper 43 having a high height is provided on the side of the second link mounting table 52.

  Further, a link fixing bracket having a pin hole through which the fixing pin 42 is inserted at a position corresponding to the first link mounting table 51 on the connecting member 22 on the upper surface side of the tip end of the first lattice jib 2. 40 is provided. Accordingly, when the fourth tension link 14 is mounted and stored on the first link mounting table 51, the second link connecting boss 34 is not connected to the fourth link 14 as shown by the solid line in FIG. The posture is set to a horizontal posture substantially parallel to the upper surface of the first lattice jib 2, and in this posture, the fixing pin is inserted into the pin hole of the second link connecting boss 34 and the pin hole of the link fixing bracket 40. 42 is inserted, and the fixing pin 42 is prevented from coming off by the split pin 44, so that it is stored on the upper surface side of the first lattice jib 2.

C-2: Storage and Transport of the First Lattice Jib 2 The first lattice jib 2 is stored or transported in a single state in which the fourth tension link 14 is stored on the upper surface thereof. The third lattice jib 5 having a smaller cross-sectional shape can be stored or transported even in the state in which the first lattice jib 2 is exposed to the outside in any form. The overall height of the first lattice jib 2 including the four tension links 14 affects the storage performance and transportability.

  In this case, in this embodiment, the fourth tension link 14 is placed in a horizontal posture on the first link mounting table 51 having a lower mounting surface on the upper surface side of the first lattice jib 2. For example, when the fourth tension link 14 is stored on the second link mounting table 52 having a high mounting surface, or the first link mounting table 51 is fixed. The first lattice jib 2 including the fourth tension link 14 is equivalent to the amount that the link connecting bosses 33 and 34 do not extend upward from the link main body as compared with the case of storing in the vertical posture upward. The overall height is lowered, and the storage performance or transportability of the first lattice jib 2 is improved by the reduction of the height.

  On the other hand, when the first lattice jib 2 is connected to another lattice jib in order to use the first lattice jib 2 as a part of the luffing jib 105, the fourth tension link 14 is also connected to another tension link. Connected. In that case, the fixing pin 42 is removed and the fixed state of the fourth tension link 14 stored on the first link mounting table 51 is released. Then, the handle 35 is gripped to move the fourth tension link 14 along the slope, and transferred from the first link mounting table 51 to the second link mounting table 52 side. The fourth tension link 14 is rotated on the second link mounting table 52 to change its posture to a vertical posture.

  In this manner, the fourth tension link 14 is transferred onto the second link mounting table 52 on the higher side, and the posture is changed to the vertical posture so that the second link connecting boss 34 is moved to the first link mounting boss 34. By making the posture perpendicular to the upper surface of the lattice jib 2, a large working space is secured around the fourth tension link 14, and the fourth tension link 14 can be easily connected to other tension links. Can do.

C-3: Storage of Third Lattice Jib 5 FIGS. 17 to 20 show a state in which the third lattice jib 5 is stored in the first lattice jib 2. The third latch jib 5 is stored in the first lattice jib 2 and the third latch jib 5 is prevented from being detached by the retaining mechanism 54 after the completion of the storage. Since it is the same as the case, the corresponding explanation is used and the explanation here is omitted.

  The third lattice jib 5 is housed in the first lattice jib 2 while the seventh tension link 17 is stored on the upper surface of the third lattice jib 5. Therefore, during the storing operation, the occurrence of damage and workability due to the contact of the first lattice jib 2 and the third lattice jib 5 becomes a problem. That is, when the third lattice jib 5 is stored in the first lattice jib 2, the seventh tension stored inside the upper surface of the first lattice jib 2 and the upper surface of the third lattice jib 5. A gap between the upper surface of the link 17 and the upper surface is important. If the gap is too small, the third lattice jib 5 is swung in the vertical direction of the third lattice jib 5 during the storing operation of the third lattice jib 5. There is a concern that the first lattice jib 2 may come into contact with the first lattice jib 2 to cause damage.

  However, in this embodiment, when the third lattice jib 5 is stored, the seventh tension link 17 stored on the upper surface of the third lattice jib 5 is replaced with the first link mounting table 51 on the lower side. For example, the seventh tension link 17 is mounted on the second link mounting table 52 on the high-order side because it is placed on and set in a horizontal posture (see FIGS. 19 and 20). In addition, the height of the seventh tension link 17 from the upper surface of the third lattice jib 5 is smaller than when the vertical posture is set, and the seventh tension link 17 and the first tension link 17 The gap in the height direction between the upper surface of the lattice jib 2, that is, the size of the gap that can absorb the shaking displacement of the third lattice jib 5 can be sufficiently secured, and thereby the third lattice jib can be secured. 5 and In which the occurrence of damage due to contact with one of Rachisujibu 2 is prevented as much as possible. Therefore, when the third lattice jib 5 is stored in the first lattice jib 2, the workability can be improved by performing the operation without worrying about the contact between them.

  On the other hand, for example, when the seventh tension link 17 is mounted on the second link mounting table 52 and stored on the upper surface of the third lattice jib 5 in a vertical posture, Since the height of the seventh tension link 17 from the upper surface of the third lattice jib 5 is increased, it is necessary to reduce the cross-sectional shape of the third lattice jib 5 in order to secure the gap. According to the configuration of this embodiment, such a countermeasure is not required, and accordingly, a decrease in strength performance of the third lattice jib 5 due to the structure of reducing the cross-sectional shape of the third lattice jib 5 is avoided in advance. The strength performance of the third lattice jib 5 can be maintained at a high level.

D: Others D-1: In the first embodiment, the link mounting table 41 is set at a constant height. However, in another embodiment of the present invention, the height of the link mounting table 41 is You may comprise so that a change setting can be performed. As a specific method, for example, instead of placing the link mounting table 41 fixedly with respect to the link support member 27, the link mounting table 41 is moved up and down by a driving mechanism such as a link mechanism or a jack mechanism. It is conceivable to configure such that it can be moved in the direction and held at the upper position and the lower position.

  D-2: Both the rotation operation of the fourth tension link 14 in the first embodiment and the movement operation and rotation operation of the fourth tension link 14 in the second embodiment are both performed manually. However, the present invention is not limited to such a configuration. For example, each of these operations can be performed by appropriate mechanical means.

1 ··· Base jib 2 ··· 1st lattice jib 3 ··· 2nd lattice jib 4 · · reducer 5 · · 3rd lattice jib 6 · · 4th lattice jib 7 · · jib head 11 · · 1st tension link 12 ··· Second tension link 13 ·· Third tension link 14 · · Fourth tension link 15 · · Fifth tension link 16 · · Sixth tension link 17 · · Seventh tension link 18 ·・ Eighth tension link 21 ・ ・ Main material 22 ・ ・ Connecting material 23 ・ ・ Slope material 24 ・ ・ Base end side work stage 25 ・ ・ Front end side work stage 26 ・ ・ Walking stage 27 ・ ・ Link support material 29 ・ ・End diagonal member 30 ..Guide rail 31 ..First jib connection boss 32 ..Second jib connection boss 33 ..First link connection boss 34 .. second link connecting boss 35 .. handle 36 .. stopper 40 .. link fixing bracket 41 .. link mounting table 42 .. fixing pin 43 .. stopper 44 .. split pin 45 .. guide roller 46.・ Bracket 47 ・ ・ Jib cradle 51 ・ ・ First link mounting table 52 ・ ・ Second link mounting table 54 ・ ・ Retaining mechanism 55 ・ ・ Bracket 56 ・ ・ Bracket 57 ・ ・ Link bar 58 ・ ・ Connecting pin 59 ·· Connecting pin 60 · · Receiving portion 61 · · Stopper 62 · · Suspension hole 101 · · Vehicle 102 · · Swing base 103 · · Telescopic boom 104 · · Jib base 105 · · Roughing jib 106 · · 1st Mast 107 ·· second mast 108 ·· tension link 110 ·· boom boom cylinder 113 · · tension wire 115 .. Tension winch 117 .. Aerial sheave Z.. Mobile crane

Claims (3)

Storage of a tension link for storing a tension link formed by providing bosses for link connection at both ends of a straight link body on the upper surface side of the lattice jib so as to extend radially outward from the outer peripheral surface of the link body. Structure,
A link mounting table on which the tension link is mounted on the upper surface side of the lattice jib, and a horizontal posture in which the link connecting boss is substantially parallel to the upper surface of the lattice jib on the tension link mounted on the link mounting table. A tension link storage structure comprising a link fixing means for fixing with a tension link. In claim 1,
The link mounting table includes a first link mounting table and a second link mounting table having a mounting surface on a higher side than the mounting surface of the first link mounting table,
When the tension link is mounted on the first link mounting table, the link connecting boss is set in the horizontal posture so as to be substantially parallel to the upper surface of the lattice jib and fixed in the posture by the link fixing means. And a tension link storage structure, wherein the link connecting boss can be in a vertical posture substantially perpendicular to the upper surface of the lattice jib when mounted on the second link mounting table. In claim 1 or 2,
In the outer lattice jib having a large cross-sectional shape with the tension link stored on the upper surface, the inner lattice jib having a smaller cross-sectional shape than the outer lattice jib is stored with the tension link stored on the upper surface.
The tension link stored on the outer lattice jib side and the tension link stored on the inner lattice jib side are both set to the horizontal posture and fixed in the posture by the link fixing means. The tension link storage structure.

Images