JP6107890B2 - Mobile crane - Google Patents

Description

  The present invention relates to a mobile crane.

  Patent Document 1 discloses a conventional mobile crane. The mobile crane described in Patent Document 1 includes a telescopic boom mounted on a vehicle, a luffing jib provided at the distal end of the telescopic boom, a first mast provided at the base end of the luffing jib, and a tension member. I have. The tension member is configured to connect the leading end of the luffing jib and the leading end of the first mast, thereby supporting the luffing jib.

  The mobile crane described in Patent Document 1 transports a luffing jib or the like in an exploded state to a work site by a truck or the like, and then is assembled at the work site. At the work site, the luffing jib is placed on the ground and the tension member is temporarily placed on the luffing jib. Thereafter, one end of the tension member is connected to the leading end of the luffing jib, and the other end of the tension member is connected to the leading end of the first mast.

  The luffing jib is provided with a holder. The holder is configured to hold the tension member so that the tension member does not shift or fall laterally when the tension member is temporarily placed on the luffing jib. The retainer is attached to a supplemental girder that reinforces the main girder of the luffing jib.

Japanese Patent Laid-Open No. 10-194677

  By the way, the tension member is made of, for example, a rod-shaped metal material and has a considerable weight. For this reason, when the holder is attached to the complementary girder, when the tension member is held by the holder, a load in the bending direction is greatly applied to the auxiliary girder, and the complementary girder may be deformed.

  On the other hand, if the holder is attached to the main girder, the support strength can be secured, but the holder protrudes from the upper end of the luffing jib, so when transporting by truck etc., it may exceed the limit height by road law. There was a problem that there was.

  The present invention has been made in view of the above circumstances. The purpose of the present invention is to ensure strength even when temporarily placing a guy link on an attachment when assembling at a work site, and at the time of transportation. It is an object of the present invention to provide a mobile crane capable of not exceeding the limit height.

  The mobile crane of the present invention is a mobile crane provided with a lattice structure attachment having main girders at four corners and a guy link attached to the attachment, and the attachment is such that the attachment lies on the ground. A mounting bracket provided on an inner surface of the main girder positioned above the attachment in a state, and a guy link receiver mounted on the main girder via the mounting bracket, the guy link receiver Is configured to be switchable between a holding state in which the guy link can be held above the main girder and a storage state located below the position in the holding state and on the inner side of the main girder. It is characterized by being.

  According to the mobile crane of the present invention, since the guy link receiver is attached to the main girder, sufficient support strength can be secured as compared with the case where it is attached to the supplementary girder. By switching the link receiver to the housed state, it can be prevented from protruding from the upper end of the attachment and the end in the width direction of the attachment.

  In this mobile crane, it is preferable that the mounting bracket is provided on a lateral side surface of the inner side surface of the main girder in a state where the lattice boom is lying on the ground.

  According to the mobile crane of the present invention, it is possible to prevent the stored guy link receiver from separating too far downward from the upper end of the main girder. Is easy to reach.

  In this mobile crane, it is preferable that the guy link receiver is attached to the mounting bracket so as to be rotatable around an axis along the longitudinal direction of the main girder.

  According to the mobile crane of the present invention, the movable structure of the guy link receiver can be simplified.

  In this mobile crane, the portion of the guy link receiver that contacts the upper surface of the main girder is formed of an elastic body.

  According to the mobile crane of the present invention, even if the guy link is held by the guy link receiver in the holding state, the impact on the main girder can be buffered and the main girder can be prevented from being damaged. Moreover, even if a dimensional error in manufacturing occurs in the main girder or guy link receiver, the elastic body can be elastically deformed to absorb the dimensional error and to suppress rattling.

  According to the mobile crane of the present invention, when assembling at a work site, strength can be secured even if a guy link is temporarily placed on an attachment, and the height limit can be prevented from being exceeded during transportation. .

1 is an overall view of a mobile crane according to an embodiment of the present invention. 2A and 2B are side views during assembly of the mobile crane of the embodiment. 3A and 3B are side views during assembly of the mobile crane of the embodiment. FIG. 4A is a plan view of a lattice boom of the mobile crane of the embodiment. FIG. 4B is a side view of the lattice boom of the mobile crane of the embodiment. FIG. 5A is a cross-sectional view showing a guy link receiver in a holding state of the mobile crane of the embodiment. FIG. 5B is a cross-sectional view showing the guy link receiver in the storage state of the mobile crane of the embodiment. In the mobile crane of the said embodiment, it is a perspective view which shows the guy link receiver of the state holding the guy link.

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

  As shown in FIG. 1, the mobile crane of the present embodiment is a crawler crane and is a luffing crane with a jib. The mobile crane includes a traveling body 1 and an attachment 3.

  The traveling body 1 is a vehicle body that can be grounded and moved. The traveling body 1 supports the attachment 3. The traveling body 1 includes a lower traveling body 11, an upper revolving body 12 that can pivot with respect to the lower traveling body 11, and a counterweight 21.

  The lower traveling body 11 moves the upper revolving body 12 and the attachment 3 along the ground. The lower traveling body 11 of the present embodiment is configured by a crawler type carrier having a pair of crawlers, but may be a wheel type carrier, for example.

  The upper swing body 12 is attached to the upper portion of the lower traveling body 11 via a swing bearing, and is rotatable relative to the lower traveling body 11. The attachment 3 is attached to the front portion of the upper swing body 12 via a boom foot pin 37.

  The attachment 3 is a part that hangs a load, and is connected to the traveling body 1 that is in contact with the ground so as to be rotatable about a horizontal axis orthogonal to the front-rear direction. The attachment 3 is pivotally supported by the upper swing body 12 so as to be able to rotate from a state lying on the ground to a standing state. The attachment 3 according to the present embodiment includes a lattice boom 31, a lattice jib 32, a front strut 33, and a rear strut 34.

  The lattice boom 31 is rotatably supported on the front portion of the traveling body 1 via a boom foot pin 37. The boom foot pin 37 extends in a horizontal direction orthogonal to the front-rear direction. The lattice boom 31 includes a plurality of main girders 35 provided at four corners and an auxiliary girder 36 that connects the opposed main girders 35 to each other, and is formed in a lattice structure. The main girder 35 and the complementary girder 36 are constituted by pipe-shaped steel pipes having a circular cross section. The diameter of the main girder 35 is formed larger than the diameter of the auxiliary girder 36, and the bending rigidity of the main girder 35 is larger than the bending rigidity of the auxiliary girder 36. A lattice jib 32 is rotatably supported on the upper end of the lattice boom 31 via a jib foot pin 38. The jib foot pin 38 is parallel to the boom foot pin 37.

  Similar to the lattice boom 31, the lattice jib 32 includes a plurality of main girders 35 provided at four corners and complementary girders 36 that connect the opposing main girders 35 to each other, and is formed in a lattice structure. Similarly to the main girder 35 of the lattice boom 31, the main girder 35 of the lattice jib 32 has a bending rigidity larger than that of the auxiliary girder 36.

  The front strut 33 is connected to the tip of the lattice boom 31 (the end opposite to the boom foot pin 37 side in the lattice boom 31) so as to be rotatable around the pin. The rear strut 34 is attached to the tip of the lattice boom 31 so as to be rotatable around the pin at a position below the front strut 33. Moreover, the front-end | tip part of the front strut 33 and the front-end | tip part of the lattice jib 32 are connected with the guy link 6 (henceforth, jib guy link 61). The distal end portion of the rear strut 34 and the proximal end portion of the lattice boom 31 are connected via a guy link 6 (hereinafter referred to as a strut guy link 62).

  Each jib guy link 61, 62 is connected to a plurality of link members 63 via connecting pins 64 (see FIG. 6). Each link member 63 is made of, for example, a plate-like or bar-like metal material. Two jib guy links 61 are provided side by side along the width direction of the lattice jib 32 and are arranged in parallel to each other. Similar to the jib guy link 61, two strut guy links 62 are provided side by side in the width direction of the lattice boom 31 and are arranged in parallel to each other.

  A plurality of point sheaves 40 are provided at the tip of the rear strut 34. Further, a jib upper spreader 39 having a plurality of sheaves is provided at the front end portion of the front strut 33. A jib hoisting rope 41 is wound around the plurality of point sheaves 40 and the plurality of sheaves of the jib upper spreader 39 so as to reciprocate. One end of the jib hoisting rope 41 is coupled to one of the jib spreaders 39 and 40. The other end of the jib hoisting rope 41 is wired along the back side of the lattice boom 31 through the idler sheave 42 provided from the point sheave 40 to the rear side of the tip of the lattice boom 31, and is wound around the jib hoisting drum 43. The jib hoisting drum 43 is provided at the base end of the lattice boom 31 (the end on the boom foot pin 37 side).

  When the jib hoisting drum 43 winds up the jib hoisting rope 41, the jib upper spreader 39 moves in a direction approaching the point sheave 40, and the lattice jib 32 is pulled through the jib guy link 61, whereby the lattice jib 32 rises. Rotate. On the other hand, when the jib hoisting drum 43 feeds the jib hoisting rope 41, the upper jib spreader 39 moves away from the point sheave 40, and the lattice jib 32 rotates in the lowering direction.

  A plurality of hook blocks 44 are suspended from the tip of the lattice jib 32. The mobile crane of this embodiment includes a main hook 45 and a supplementary hook 46 as a plurality of hook blocks 44. These hook blocks 44 are connected to a hook winch device 47 and configured to be wound up and down.

  The mobile crane according to the present embodiment includes a mast 48, a gantry 53, and a counterweight trailer 22.

  The mast 48 is connected to the front of the upper swing body 12 so as to be rotatable about an axis parallel to the boom foot pin 37. The mast 48 is formed in a lattice structure including a main girder 35 and a complementary girder 36. A boom lower spreader 49 is provided at the tip of the mast 48. Further, a guy link 6 (hereinafter referred to as a boom guy link 65) is connected to the tip of the lattice boom 31, and the boom upper spreader 50 is connected to an end of the guy link 65 opposite to the lattice boom 31 side. Is provided. A boom hoisting rope 52 is wound between the lower boom spreader 49 and the upper boom spreader 50.

  One end of the boom hoisting rope 52 is coupled to one of the boom spreaders 49 and 50. The other end of the boom hoisting rope 52 is wired along the back side of the mast 48 through a sheave 58 provided at the tip of the mast 48 and wound around the boom hoisting drum 51. The boom hoisting drum 51 is provided at the base end of the mast 48.

  When the boom hoisting drum 51 winds up the boom hoisting rope 52, the boom upper spreader 50 moves in a direction approaching the boom lower spreader 49 and rotates in a direction in which the lattice boom 31 rises via the boom guy link 65. On the other hand, when the boom hoisting drum 51 extends the boom hoisting rope 52, the boom upper spreader 50 moves away from the boom lower spreader 49, and the lattice boom 31 rotates in the lowering direction.

  The boom guy link 65 has a plurality of link members 63 connected via connecting pins 64 (see FIG. 6), and has the same structure as the jib guy links 61 and 62. Two boom guy links 65 are provided side by side in the width direction of the lattice boom 31 and are arranged in parallel to each other. The dimension between the two boom guy links 65 is shorter than the dimension between the strut guy links 62.

  The gantry 53 is provided at the rear part of the upper swing body 12. A mast lower spreader 54 is provided at the upper end of the gantry 53. Further, a guy link 6 (hereinafter referred to as a mast guy link 66) is connected to the tip of the mast 48, and an upper mast spreader 55 for mast 48 is connected to an end of the guy link 66 opposite to the mast 48 side. Is provided. A mast hoisting rope 56 is wound between the mast upper spreader 55 and the mast lower spreader 54.

  One end of the mast hoisting rope 56 is coupled to one of the mast spreaders 54 and 55. The other end of the mast hoisting rope 56 is wound around a mast hoisting drum 57 provided at the lower end of the gantry 53. As a result, the mast hoisting drum 57 rotates so that the mast 48 rises and lowers when the mast hoisting rope 56 is wound up and fed out.

  Further, the counterweight trailer 22 is connected from the tip end portion of the mast 48 via a suspension link 67. The counterweight 21 is provided at the rear part of the upper swing body 12.

  The mast guy link 66 and the suspension link 67 have a plurality of link members 63 connected via connecting pins 64 (see FIG. 6), and have the same structure as the jib guy links 61 and 62.

  The mobile crane of the present embodiment is disassembled into parts such as the lattice boom 31, the lattice jib 32, the front strut 33, the rear strut 34, and the like, and is carried into the work site, and then assembled at the work site. Here, in FIG. 2A, FIG. 2B, FIG. 3A, FIG. 3B, the side view during the assembly of the mobile crane of this embodiment is shown.

  As shown in FIG. 2A, the lattice boom 31, the lattice jib 32, the front strut 33, the rear strut 34, and the mast 48 are assembled to the traveling body 1 so as to be in a state of lying on the ground. At this time, the jib guy link 61 is temporarily placed on the lattice jib 32 lying on the ground. Further, the strut guy link 62 in a state where the distal end portion of the rear strut 34 and the proximal end portion of the lattice boom 31 are connected is placed on the lattice boom 31 in a state of being lying on the ground.

  In this state, as shown in FIG. 2B, the rear strut 34 is rotated to the front strut 33 side, and a pulling force is applied to the base end portion side of the boom 31 with respect to the strut guy link 62 to stretch the strut guy link 62.

  Next, one end of the jib guy link 61 temporarily placed on the lattice jib 32 is connected to the tip of the lattice jib 32, and the other end of the jib guy link 61 is connected to the tip of the front strut 33. Then, as shown in FIG. 3A, the front strut 33 is rotated so as to approach the rear strut 34, and the boom upper spreader 50 is moved to the boom lower spreader 49 side (see FIG. 1), so that the lattice boom 31 is slightly moved. cause. Further, a pulling force is applied to the tip of the jib 32 with respect to the jib guy link 61. Thus, the jib guy link 61 is stretched between the front end portion of the front strut 33 and the front end portion of the lattice jib 32.

  Thereafter, the boom upper spreader 50 is further moved to the boom lower spreader 49 side, the lattice boom 31 is raised, and the lattice jib 32 is raised to complete the assembly.

  Thus, when assembling the mobile crane of the present embodiment, the jib guy link 61 is temporarily placed on the lattice jib 32 and the strut guy link 62 is temporarily placed on the lattice boom 31. At this time, the jib guy links 61 and 62 need to be arranged in a predetermined position at a predetermined position with respect to the lattice jib 32 and the lattice boom 31 in consideration of the connecting work. For this reason, the lattice boom 31 of this embodiment is provided with a plurality of guy link receivers 8.

  4A is a plan view of the lattice boom 31, and FIG. 4B is a side view of the lattice boom 31. The plurality of guy link receivers 8 are arranged at intervals in the longitudinal direction of the main girder 35 on each main girder 35 positioned on the upper side of the lattice boom 31 in a state of lying on the ground. Below, it demonstrates based on the lattice boom 31 of the state which fell on the ground.

  As shown in FIG. 5, each guy link receiver 8 is attached to a main girder 35 via a mounting bracket 7. The mounting bracket 7 is fixed to an inner surface of a main girder 35 (hereinafter simply referred to as a main girder 35) located above the lattice jib 32. The mounting bracket 7 has a metal plate welded to the main girder 35. The main surface of the mounting bracket 7 is orthogonal to the longitudinal direction of the main beam 35.

  Here, the inner surface of the main girder 35 refers to a surface facing another main girder 35 adjacent in the left-right direction or the up-down direction. Therefore, in the present embodiment, the “inner side surface of the main girder 35” is the main girder 35 located in a region (region denoted by reference numeral 91 in FIG. 5A) up to 270 ° from the upper end to the main girder 35 facing in the left-right direction. Refers to the outer peripheral surface.

  The connection position of the mounting bracket 7 with respect to the main girder 35 is preferably located below the upper end of the main girder 35, and the upper end of the mounting bracket 7 is preferably located below the upper end of the main girder 35. The connection position of the mounting bracket 7 to the main girder 35 is preferably located above the lower end of the main girder 35, and the lower end of the mounting bracket 7 is preferably located above the lower end of the main girder 35. That is, the mounting bracket 7 is provided on the lateral side surface of the main girder 35 (the outer peripheral surface in the region indicated by reference numeral 92 in FIG. 5B). That is, in this case, the mounting bracket 7 of the present embodiment is configured not to protrude above and outside the main beam 35.

  The mounting bracket 7 is provided with a rotation shaft insertion hole 71, a first insertion hole 72, and a second insertion hole 73. The insertion holes 71, 72, 73 are arranged at an equal pitch in the vertical direction. The inner diameter of the first insertion hole 72 and the inner diameter of the second insertion hole 73 are formed to have the same dimensions.

  The guy link receiver 8 is attached to the rotary shaft insertion hole 71 of the mounting bracket 7 via the rotary shaft 74. The guy link receiver 8 has a Y-shaped receiving part main body 81 in front view, a mounting part 86 provided below the receiving part main body 81, and extends from the receiving part main body 81 toward the inner surface side of the main girder 35. The attaching part 87 is provided.

  The receiving portion main body 81 includes a movement restricting portion 82 and a support portion 85. The movement restricting unit 82 restricts the guy link 6 from moving in the left-right direction. The movement restricting portion 82 is configured by notching the upper end of the metal plate in a concave shape (this portion is referred to as a groove-shaped notch 83). Further, the movement restricting portion 82 has a pair of introducing portions 84 provided above the groove-shaped notch 83. The lower end portions of the pair of introduction portions 84 are continuous with the upper end of the groove-shaped notch 83. The upper end edges of the pair of introducing portions 84 are configured such that the distance between the facing portions increases as it goes upward.

  The support part 85 supports the guy link 6 from below. As shown in FIG. 6, the support portion 85 is disposed adjacent to the movement restricting portion 82. The upper end of the support portion 85 is located above the inner surface of the groove-shaped notch 83 of the movement restricting portion 82. The portion of the support portion 85 that directly contacts the guy link 6 is made of an elastic body such as rubber or soft resin.

  The placing portion 86 is a portion where the guy link receiver 8 is placed on and contacts the main girder 35. The mounting portion 86 is made of an elastic body such as rubber or soft resin. The placing portion 86 is fixed to the receiving portion main body 81.

  The attachment portion 87 extends in an arc from the lower portion of the receiving portion main body 81 toward the laterally obliquely downward direction. The attachment portion 87 has a shape along the outer peripheral surface of the main girder 35. The attaching portion 87 is configured by connecting a pair of metal plates with a connecting body 87a. The attachment portion 87 is provided with an attachment hole 89 through which the rotation shaft 74 is passed. By passing the rotating shaft 74 along the longitudinal direction of the main girder 35 (more specifically, parallel to the longitudinal direction) through the rotating shaft insertion hole 71 and the mounting hole 89 of the mounting bracket 7, the guy link is attached to the mounting bracket 7. A receiver 8 is attached.

  The guy link receiver 8 is attached so as to be placed on the main beam 35 (this state is referred to as a holding state). Further, the guy link receiver 8 can be stored so as to fall down on the inner surface side of the main girder 35 (this state is referred to as a stored state).

  As shown in FIG. 5A, when the guy link receiver 8 is in the holding state, the guy link receiver 8 can hold the guy link 6. When the guy link 6 is held by the guy link receiver 8 in the holding state, the guy link 6 can be held immediately above the main girder 35, and the guy link 6 can be prevented from being displaced in the left-right direction.

  When the guy link receiver 8 in the holding state is moved to the inner surface side of the main girder 35, the guy link receiver 8 is below the position in the holding state and on the inner surface side of the main girder 35 as shown in FIG. 5B. Located in. At this time, the guy link receiver 8 does not protrude from the upper end of the main beam 35 and also does not protrude from the outer end of the main beam 35.

  The guy link receiver 8 is provided with a pin insertion hole 88. The pin insertion hole 88 communicates with the first insertion hole 72 when the guy link receiver 8 is in the holding state. Accordingly, the guy link receiver 8 in the holding state is maintained in the holding state by the pin 75 being passed through the pin insertion hole 88 and the first insertion hole 72. Further, the pin insertion hole 88 communicates with the second insertion hole 73 when the guy link receiver 8 is stored. Therefore, the guy link receiver 8 in the accommodated state is maintained in the accommodated state by the pin 75 being passed through the pin insertion hole 88 and the second insertion hole 73.

  The guy link receiver 8 having such a configuration may be attached not only to the lattice boom 31 but also to the lattice jib 32. Accordingly, when the mobile crane of the present embodiment is assembled, when the jib guy link 61 is temporarily placed on the lattice jib 32 and the strut guy link 62 is temporarily placed on the lattice boom 31, the guy link 6 (61, 62). Can be held at a predetermined position of the lattice jib 32 or the lattice boom 31.

  Here, in general, the lattice jib 32 and the lattice boom 31 are designed so as to ensure strength in consideration of being conveyed in a disassembled state. For this reason, the lattice jib 32 and the lattice boom 31 are designed to be as large as possible within a range in which the width dimension and the height dimension do not exceed the restricted height and the restricted width according to the road law. For this reason, if the guy link receiver 8 is fixed to the main girder 35, the limit height or the limit width may be exceeded.

  On the other hand, the mobile crane of this embodiment is configured so that the guy link receiver 8 can be switched to the stored state. For this reason, by switching the guy link receiver 8 to the housed state, when the disassembled lattice jib 32 or lattice boom 31 is transported to the work site by a truck or the like, the restricted height or restricted width by the road intersection method is not exceeded.

<Effect>
As described above, the mobile crane of the present embodiment includes the lattice structure attachment 3 having the main girders 35 at the four corners, and the guy link 6 provided on the attachment 3. The attachment 3 includes a mounting bracket 7 and a guy link receiver 8. The mounting bracket 7 is provided on the inner side surface of the main girder 35 positioned above the attachment 3 in a state where the attachment 3 is lying on the ground. The guy link receiver 8 is mounted on the main girder 35 via the mounting bracket 7. The guy link receiver 8 is configured to be switchable between a holding state and a storage state. The holding state is a state in which the guy link 6 can be held above the main beam 35. The storage state is a state located below the holding position and on the inner surface side of the main beam 35.

  For this reason, when the mobile crane of this embodiment is assembled at the work site, the strength can be secured even if the guy link 6 is temporarily placed on the attachment 3, and the height limit is not exceeded during transportation. it can. That is, the guy link receiver 8 of the present embodiment is secured to the main girder 35, so that sufficient support strength can be ensured compared to that attached to the complementary girder 36, and at the time of transport, the guy link By switching the receptacle 8 to the housed state, it can be prevented from projecting from the upper end of the attachment 3 and the end of the attachment 3 in the width direction.

  In addition, as shown in FIG. 6, since the guy link 6 is positioned above the main girder 35, the mobile crane of the present embodiment can easily perform the connecting operation of the link member 63. For example, the connection end portion of the link member 63 can be supported by the main beam 35, and the operator can easily insert the connecting pin 64.

  Moreover, the mobile crane of this embodiment has the following additional structures. That is, in the mobile crane of the present embodiment, the bracket is provided on the lateral side surface of the main girder 35 with the lattice boom 31 lying on the ground.

  For this reason, according to the mobile crane of this embodiment, the guy link receiver 8 in the stored state can be prevented from being separated too far from the upper end of the main girder 35. Thereby, when switching the guy link receiver 8 to the holding state, the worker can easily reach the guy link receiver 8 and work easily.

  Moreover, the mobile crane of this embodiment has the following additional structures. That is, the mobile crane of the present embodiment is attached to the mounting bracket 7 so that the guy link receiver 8 can rotate around an axis along the longitudinal direction of the main girder 35.

  For this reason, according to the mobile crane of this embodiment, the movable structure of the guy link receiver 8 can be simplified.

  Moreover, the mobile crane of this embodiment has the following additional structures. That is, in the mobile crane of the present embodiment, the portion (mounting portion 86) that contacts the upper surface of the main girder 35 in the guy link receiver 8 is formed of an elastic body.

  For this reason, according to the mobile crane of this embodiment, when the guy link 6 is held by the guy link receiver 8 in the holding state, the impact on the main girder 35 can be buffered and the main girder 35 can be damaged. Can be prevented. Moreover, even if a dimensional error in manufacturing occurs in the main beam 35 or the guy link receiver 8, the rattling can be suppressed.

  Further, the mounting bracket 7 and the guy link receiver 8 of the present embodiment are configured so that the guy link receiver 8 in the housed state can be held in position and the guy link receiver 8 in the held state can be held in position.

  For this reason, according to the mobile crane of the present embodiment, it is possible to prevent the guy link receiver 8 in the housed state from rotating during transportation, and the guy link receiver 8 in the state holding the guy link 6 can be prevented. It can prevent falling.

<Application>
In the mobile crane according to the present embodiment, the guy link receiver 8 is configured to hold the strut guy link 62, but it may be configured to hold the jib guy link 61. Further, the guy link receiver 8 may hold, for example, a boom guy link 65, a mast guy link 66, and the like, and is not limited to the guy links 61 and 62.

  The guy link receiver 8 is rotatably attached to the mounting bracket 7 via the rotary shaft 74. For example, the guy link receiver 8 may be configured to move slidably along the outer peripheral surface of the main girder 35. Good. In this case, for example, the mounting bracket 7 may be configured by a fixed portion fixed to the outer peripheral surface of the main girder 35 and a movable portion that slides in a direction along the outer peripheral surface of the main girder 35 with respect to the fixed portion. Good.

  Further, the mounting bracket 7 of the present embodiment is provided on the side surface in the lateral direction, but may be provided on the lower surface side of the main girder 35.

  The mobile crane of the present embodiment includes the lattice boom 31, the lattice jib 32, the rear strut 34, and the front strut 33 as the attachment 3, but may not include the lattice jib 32, the rear strut 34, and the front strut 33. Good. Further, the rear strut 34 and the front strut 33 may not be rotatable and may be fixed. Further, although the mobile crane, the mast 48, and the gantry 53 of the present embodiment are provided, the mast 48 may not be provided, and a mast may be provided instead of the gantry 53. Further, the counterweight trailer 22 may not be provided.

DESCRIPTION OF SYMBOLS 1 Traveling body 3 Attachment 31 Lattice boom 32 Lattice jib 33 Front strut 34 Rear strut 35 Main girder 36 Supplemental girder 44 Hook block 48 Mast 53 Gantry 6 Guy link 61 Jib guy link 62 Strut guy link 63 Link member 64 Connecting pin 65 Boom guy link 66 Mast guy link Link 67 Hanging link 7 Mounting bracket 71 Rotating shaft insertion hole 72 First insertion hole 73 Second insertion hole 74 Rotating shaft 8 Guy link receiver 81 Receiving part main body 82 Movement restricting part 83 Grooved notch 84 Introduction part 85 Support part 86 Mounting portion 87 Mounting portion 88 Pin insertion hole

Claims (4)

An attachment with a lattice structure having main girders at the four corners;
A mobile crane with a guy link attached to the attachment,
The attachment is
A mounting bracket provided on an inner surface of the main girder located above the attachment in a state where the attachment is lying on the ground;
A guy link receiver mounted on the main girder via the mounting bracket;
The guy link receiver is between a holding state in which the guy link can be held above the main girder and a storage state located below the position in this holding state and on the inner surface side of the main girder. A mobile crane characterized by being configured to be switchable. The mobile crane according to claim 1, wherein the mounting bracket is provided on a lateral side surface of the inner side surface of the main girder in a state where the lattice boom is lying on the ground. The mobile crane according to claim 1 or 2, wherein the guy link receiver is attached to the mounting bracket so as to be rotatable about an axis along a longitudinal direction of the main girder. . The mobile crane according to any one of claims 1 to 3, wherein a part of the guy link receiver in contact with the upper surface of the main girder is formed of an elastic body.

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