JP2010042879A - Jib expanding and accommodating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jib expanding and accommodating apparatus having a simple constitution capable of reducing the projection of a jib at the accommodating position to the boom side. <P>SOLUTION: The jib expanding and accommodating apparatus comprises a boom side guide member 30 provided on a boom 5, a jib side guide member 40 provided on a jib 8, and a hydraulic cylinder 15 provided on a jib intermediate supporting mechanism 10. When the jib 8 at the accommodating position is turned around a first turning shaft A1 by the biasing force from the hydraulic cylinder 15, the jib side guide member 40 is abutted on the boom side guide member 30, and the jib 8 is turned around a second turning shaft A2 by the biasing force from the boom side guide member 30, and moved to the lower holding position. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib overhanging storage device that can store a jib in a boom when not in use, and can project the jib to the tip of the boom when in use, in a mobile crane such as a wheel crane.

  Conventionally, the thing of patent documents 1-3 is known as a wheel type crane provided with a jib storage device. In these wheel type cranes, jib support shafts project from both side surfaces of the tip of a telescopic boom. And the connection part connected with the said jib support shaft so that attachment or detachment is possible is provided in the both sides of the base end part of a jib. When the jib is not used, the connecting portions on both sides of the jib (hereinafter, referred to as both-side connecting portions) can be stored on the side surface of the boom in a laying posture in which the connecting portion is vertically positioned facing the tip of the boom. On the other hand, when the jib is used, from the retracted position, the both-side connecting portion on the lower surface side of the boom is in a horizontal posture facing the jib support shafts on both sides of the boom (hereinafter, referred to as both-side jib support shafts), and The jib tip side is connected to the jib support shafts on both sides through a step of moving to a lower holding position that is inclined with respect to the boom axis in plan view so as to avoid the boom hoisting cylinder. Can be projected forward of the boom tip. Note that the overhanging jib can be stored by the reverse procedure.

However, when using the jib storage device described in Patent Document 1 and Patent Document 2, there are the following problems.
That is, the jib in the lower holding position is in a state in which the base end side is located in the direction directly below the boom, the both side coupling portions are opposed to the both side jib support shafts, and the distal end side protrudes laterally from the lower surface of the boom. Become. Therefore, if the jib is swung around the horizontal axis from the retracted position to the lower-holding position at a stretch, the jib can be moved relative to the boom axis at the retracted position in correspondence with the posture of the jib at the lower-holding position. It must be greatly inclined in plan view. As a result, the amount of protrusion of the jib tip toward the boom side increases, so that the vehicle width increases or the jib length must be shortened to prevent this.

On the other hand, the jib overhanging storage device described in Patent Document 3 has a first rotation shaft that is parallel to the boom axis in a side view with respect to the boom, and a second rotation shaft that is substantially vertical in the horizontal state of the boom. A jib support mechanism rotatably provided around each other, and a connecting means for detachably connecting the jib support mechanism and an intermediate portion of the jib, and the jib support mechanism as the first rotation shaft. A jib elevating means for rotating the jib between the retracted position and a lower position positioned on the lower surface side of the boom in a horizontal position, and the jib support mechanism at the lower position; Jib rotation means for rotating the jib between the lower position and the lower holding position is provided.
According to this configuration, the jib is not moved from the side-holding storage position to the lower-holding position at once, but once moved to the lower position around the first rotation axis, and then moved around the second rotation axis. It can be rotated and set at the lower holding position. Therefore, the inclination angle of the jib at the side-holding storage position can be reduced, and the above-described problems of Patent Document 1 and Patent Document 2 can be solved.

JP-A-61-2693 Japanese Utility Model Laid-Open No. 2-127693 Japanese Unexamined Patent Publication No. 7-149497

  However, the jib overhanging storage device described in Patent Document 3 includes a jib elevating unit that rotates the jib support mechanism around the first rotation axis, and the jib support mechanism around the second rotation axis. Both the jib rotating means for rotating are necessary. When the jib is extended / stored, since it is necessary to control both the jib elevating means and the jib rotating means, the control configuration becomes complicated. As a result, there is a problem that the configuration of the jib overhanging storage device becomes complicated and the manufacturing cost increases.

  In view of the above circumstances, an object of the present invention is to provide a jib overhanging storage device that can reduce the protruding amount of the jib in the storage position to the side of the boom and has a simple configuration. .

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jib overhanging storage device that can store a jib in a boom when not in use, and can project the jib to the tip of the boom when in use, in a mobile crane such as a wheel crane.
The jib overhanging storage device according to the present invention has the following features to achieve the above object. That is, the jib overhanging storage device of the present invention includes the following features alone or in combination.

  In order to achieve the above object, the first feature of the jib overhanging storage device according to the present invention is that the boom is provided with jib base end support portions on both side surfaces of the tip portion, and is attached to and detached from the jib base end support portion. Jibs provided on both sides of the base end portion, the connecting portions to be connected to each other, and the jib on the side of the boom in a standing posture with the base end portion of the jib facing the tip end side of the boom. The connecting position can be held in a retracted position, and the connecting portion is moved from the retracted position to a lower holding position where the connecting portion is in a horizontal posture facing the jib base end supporting portion below the boom. It is possible to connect the jib to the jib base end support part, and to project the jib forward from the front end of the boom with this connection point as a fulcrum, and move the jib to the retracted position by the reverse procedure. Provided in possible mobile crane A jib overhanging storage device, which is provided on the boom, and is capable of detachably connecting an intermediate portion of the jib and extending the connected jib in a longitudinal direction of the boom in a side view. A jib intermediate support mechanism that supports the moving shaft and a second rotating shaft that is inclined with respect to the first rotating shaft in a side view; and a boom-side guide member provided on the boom; A jib side guide member provided in the jib, and a hydraulic cylinder provided in the jib intermediate support mechanism, wherein the jib in the storage position is urged by the urging force from the hydraulic cylinder. The jib side guide member abuts on the boom side guide member when rotating about the rotation axis, and the jib rotates about the second rotation axis by the urging force from the boom side guide member. Movement Is to move to the lower embracing position.

  Here, the standing posture means a posture of a jib arranged along the boom in a state where the connecting portions on both sides of the jib are arranged in a substantially vertical plane. Further, the horizontal posture refers to the posture of the jib arranged along the boom in a state where the connecting portions on both sides of the jib are arranged in a substantially horizontal plane.

According to this configuration, the boom-side guide member and the jib-side guide member are provided so that the jib stored on the side surface of the boom can be extended in the longitudinal direction of the boom by the operation of one hydraulic cylinder. The moving shaft and the second rotating shaft that is not parallel to the moving shaft can also be rotated and moved to the holding position.
As a result, the amount of protrusion of the jib toward the boom side at the storage position can be reduced as compared with the configuration in which the jib is rotated only around one rotation axis and moved from the storage position to the under-holding position. . Further, the configuration capable of reducing the protruding amount of the jib to the side of the boom can be realized by a simple configuration using one hydraulic cylinder, the boom side guide member, and the jib side guide member. it can.

  A second feature of the jib overhanging storage device according to the present invention is that the jib side guide member includes a first abutting portion that abuts the boom side guide member when the jib is in the storage position. And a second abutting portion that abuts against the boom side guide member when the jib is in the hugging position.

According to this configuration, when the jib is in the storage position, the boom side guide member and the first contact portion of the jib side guide member are in contact with each other, so that the jib can be reliably positioned at the storage position.
Further, when the jib is in the hugging position, the boom side guide member and the second abutting portion of the jib side guide member are in contact with each other, so that the jib can be reliably positioned at the hugging position.

  A third feature of the jib overhanging storage device according to the present invention is that the jib side guide member includes a first abutting portion that abuts on the boom side guide member when the jib is in the storage position. The jib is provided between the second abutting portion that abuts on the boom side guide member when the jib is in the holding position, the first abutting portion, and the second abutting portion. Is provided with a third contact portion that contacts the boom-side guide member when moving between the storage position and the under-holding position.

  According to this configuration, the track of the jib when moving between the storage position and the holding position is determined based on the shape of the third contact portion. Therefore, by adjusting the shape of the third contact portion, the jib trajectory can be adjusted to a desired trajectory.

  The fourth feature of the jib overhanging storage device according to the present invention is that the jib intermediate support mechanism includes a boom-side bracket fixed to the boom, and the second pivot shaft with respect to the boom-side bracket. An intermediate frame rotatably connected around the jib support frame rotatably connected to the intermediate frame around the first rotation shaft; and the jib support frame fixed to the jib A jib side bracket connectable to the jib support frame, and the jib support frame is rotated together with the intermediate frame in the second rotation in a state where the jib support frame is rotated about the first rotation axis to the lower holding position. It is provided with the rotation control part which controls turning around a moving axis.

  According to this configuration, in the jib storage step, the jib support frame is rotated around the second rotation axis when the jib side bracket and the jib support frame are connected in order to place the jib in the holding position. Regulated by the regulation department. Thereby, alignment of the jib support frame at the time of the connection becomes easy.

  According to the present invention, the configuration capable of reducing the protruding amount of the jib toward the boom side at the retracted position is made simple by using one hydraulic cylinder, the boom side guide member, and the jib side guide member. Can be realized.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic side view of a wheel crane 100 including a jib overhanging storage device according to a first embodiment of the present invention. 2 and 3 are a schematic side view and a schematic plan view of the vicinity of the boom 5 of the wheel type crane 100 shown in FIG. 1, respectively.
4, FIG. 7, and FIG. 8 are schematic views taken along arrows X1-X1, X2-X2, and X3-X3 in FIG. 2, respectively. 5 is a schematic diagram of the connecting portion between the jib support frame 13 and the jib side bracket 14 in FIG. 4 as viewed in the Y1 direction, and FIG. 6 is a schematic diagram of the Y2-Y2 cross section in FIG.
1 to 8 show a state in which the jib 8 is in the retracted position on the side surface of the boom 5. 2 to 8 show a state where the boom 5 is raised so that the distal end side of the boom 5 is higher than the proximal end side.

  As shown in FIG. 1, a wheel type crane 100 (mobile crane) includes a tire traveling type lower traveling body 2, and an upper portion that is swung on a lower traveling body 2 via a swing bearing 3. A swivel body is provided. A pair of plate-like frames 4 are erected on the upper swing body so as to sandwich the boom 5. A boom support hole through which a boom foot pin 4 a serving as a lifting fulcrum of the boom 5 passes is formed in the upper rear portion of the plate-like frame 4, and the boom foot pin 4 a is formed between the boom support hole and the base end portion of the boom 5. The boom 5 is rotatably supported by being inserted. The boom 5 is configured as a box-type multistage telescopic boom, and is configured to be able to undulate from a forwardly lowered state to a predetermined undulation angle by a boom undulation cylinder 7 provided on the lower surface side. Further, a cab 6 is provided on the right side of the boom 5 in the upper swing body, and a pump device, an engine, and the like (not shown) are provided at a rear position of the cab 6.

  As shown in FIGS. 2 and 3, jib support shafts 5 a and 5 a (jib base end support portions) protrude from both side surfaces of the tip of the boom 5. Further, on the side surface of the boom 5, there are a jib intermediate support mechanism 10 that supports a portion of the middle portion of the jib 8 that is proximal to the center of gravity of the jib 8, and a distal-end-side fixing mechanism 50 that supports the distal end portion of the jib 8. Is provided.

  As shown in FIG. 4 (see FIGS. 11, 14, and 15, which will be described later), the jib intermediate support mechanism 10 includes a boom side bracket 11 fixed to the boom 5 and an intermediate frame attached to the boom side bracket 11. 12, a jib support frame 13 attached to the intermediate frame 12, and a jib side bracket 14 fixed to the jib 8.

  The boom-side bracket 11 is provided with support shafts 11a and 11a that are substantially perpendicular to the axis of the boom 5 on both the upper and lower sides. Note that the central axis A2 (second rotation axis) of the support shafts 11a and 11a is a vertical axis when the boom 5 is in a horizontal state. Therefore, as shown in FIG. 2, when the boom 5 is held in the forwardly raised state, the central axis A <b> 2 is set to the vertical direction N by an angle θ corresponding to the undulation angle from the horizontal state of the boom 5. Will tilt. In the process of extending the jib 8, it is desirable that the angle θ is about 1 to 5 °.

The intermediate frame 12 is supported so as to be rotatable around the support shafts 11a and 11a on both upper and lower sides.
The jib support frame 13 is attached to the intermediate frame 12 so as to be rotatable around the support shaft 13a. The support shaft 13a is arranged such that the central axis A1 (first rotation shaft) is parallel to the axis of the boom 5 in a side view (see FIG. 2).
A hydraulic cylinder 15 is provided between the intermediate frame 12 and the jib support frame 13. By the operation of the hydraulic cylinder 15, the jib support frame 13 is rotated around the support shaft 13 a with respect to the intermediate frame 12.

  The connection state of the jib support frame 13 and the jib side bracket 14 will be described with reference to FIGS. As shown in FIGS. 5 and 6, the jib support frame 13 (the hatched portion in FIG. 5) engages with the jib bracket 14 and is connected to the automatic connection pin 16 provided on the jib 8 side, and manually. It is connected to the jib-side bracket 14 by a storage fixing pin 17 which is attached and detached at.

  The automatic connection pin 16 is slidably supported in the longitudinal direction of the jib 8 by pin guide plates 18 and 19 fixed to the jib 8 side, and the distal end portion 16 a is proximal to the jib 8 by the pressing force of the spring 26. The jib support frame 13 and the jib side bracket 14 are connected to each other by fitting into the pin hole 13b of the jib support frame 13. As shown in FIG. 6, the tip 16a of the automatic connecting pin 16 is formed to have a pointed shape so as to automatically fit into the pin hole 13b when the jib 8 is stored from the extended state.

The storage fixing pin 17 is formed in a hairpin shape in which a first shaft portion 17a and a second shaft portion 17b longer than the first shaft portion 17a are integrally connected by a plate 17c and a handle 17d.
The first shaft portion 17a of the storage fixing pin 17 has a protruding end portion 13c of the jib support frame 13 and a protruding end portion 14a of the jib side bracket 14 at a position shifted toward the jib tip side with respect to the connection point by the automatic connection pin 16. It is inserted across. Thereby, the jib 8 is supported by the jib support frame 13 at two points in the length direction at the intermediate portion.

  Thus, since the jib 8 is supported at two locations in the length direction by the automatic connecting pin 16 and the storage fixing pin 17, the jib 8 is in the middle as in the case where it is supported at only one point by the automatic connecting pin 16. There is no possibility of swinging up and down around the support point, and the turning operation from the storage position to the holding position can be easily performed.

On the other hand, the second shaft portion 17 b is inserted across the jib support frame 13 and the jib side bracket 14, and a retaining pin 21 is inserted into an end portion that penetrates the jib side bracket 14.
With this retaining pin 21, the storage fixing pin 17 is prevented from coming off, and as a result, the automatic connection pin 16 is prevented from being detached from the jib support frame 13. In other words, the jib 8 (the jib side bracket 14) can move to the tip side of the boom 5 only in a state where the retaining pin 21 is removed.
The jib bracket 14 is open to the base end side of the boom 5 so that the jib bracket 14 and the jib support frame 13 do not interfere when the jib 8 moves to the distal end side of the boom 5. Yes.

  Further, as shown in FIG. 4 (see FIGS. 11, 14, and 15 described later), the jib side bracket 14 and the intermediate frame 12 are provided with a flange 14b and a flange 12a, respectively. In the jib retracted state, the flanges are connected by the retracting lock pin 24.

  Further, as shown in FIG. 7, the distal-end-side fixing mechanism 50 protrudes from the base 51 protruding from the side surface of the boom 5, the boom-side support bracket 52 attached to the lower end of the front end of the base 51, and the jib 8. The jib-side support bracket 53 is provided, a tip fixing pin 54 that connects the brackets 52 and 53 to each other, and a jib tip fixing retaining pin 55 that is inserted into the tip fixing pin 54.

  As shown in FIGS. 2 and 3, the jib 8 is provided with connecting portions 8a and 8a that are detachably connected to the jib support shafts 5a and 5a on both sides of the base end portion. By the support mechanism 10 and the distal end side fixing mechanism 50, the base end portion faces the distal end side of the boom 5, and the connecting portions 8a and 8a on both sides are stored on the side surface of the boom 5 in a laying posture in which they are positioned substantially vertically up and down.

As shown in FIGS. 2, 3, and 8, the boom 5 is provided with a boom-side guide member 30.
As shown in FIG. 8, the boom-side guide member 30 is configured by a hollow rod-shaped member (pipe-shaped member) that is a first rod-shaped member that extends substantially horizontally from the side surface of the boom 5 when the boom 5 is in a horizontal state. Part 31, second rod-like part 32 bent from the first rod-like part 31 and extending substantially vertically downward, and third rod-like part bent from the second rod-like part 32 to approach the boom 5 and extending obliquely downward 33 and a fourth rod-like portion 34 that extends substantially horizontally from the lower portion of the boom 5 and supports a substantially central portion in the longitudinal direction of the second rod-like portion 32.

  The first rod-shaped portion 31 extends substantially perpendicularly to the side surface of the boom 5 from a substantially vertical central portion on the side surface of the boom 5. Further, the second rod-like portion 32 extends from the height of the first rod-like portion 31 to a position lower than the lower end of the boom 5 (the height of the upper end portion of the boom hoisting cylinder 7 in FIG. 2). Moreover, the 3rd rod-shaped part 33 is bent and extended from the 2nd rod-shaped part 32 so that the side of the boom hoisting cylinder 7 may be covered, as shown in FIG.

In addition, as shown in FIGS. 2, 3, and 8, the jib 8 is provided with a jib side guide member 40.
As shown in FIG. 8, the jib side guide member 40 is provided in the vicinity of a corner portion in a vertical cross section in the longitudinal direction of the main body of the jib 8 formed in a box shape. The corner portion is a corner portion facing the boom side guide member 30 when moving from the retracted position to the hugging position. The jib-side guide member 40 includes a first guide portion 41 provided on a lower surface 81 of the jib 8 (a surface facing the side surface of the boom 5 in the stored state) and a side surface 82 of the jib 8 (stored state). And a second guide portion 42 provided on the surface facing downward).

  The first guide portion 41 is a pipe-like member that bends in a substantially U-shape. The first guide portion 41 is a pair of vertical shaft portions 41 a and 41 a extending perpendicularly to the lower surface of the jib 8 and ends of the vertical shaft portions 41 a and 41 a. It has the parallel shaft part 41b (1st contact part) which connects a part and extends substantially in parallel with the axial center of the jib 8 (refer FIG. 14, FIG. 15). The pair of vertical shaft portions 41 a and 41 a and the parallel shaft portion 41 b are arranged in a plane substantially parallel to the side surface 82 of the jib 8.

  And the shape and position of the parallel shaft part 41b are adjusted so that the jib 8 will be in the saddle position in the state in which the parallel shaft part 41b contact | abutted to the 2nd rod-shaped part 32 in the boom side guide member 30. . In the present embodiment, the connecting portions 8a, 8a are positioned substantially vertically up and down, and the jib 8 has the boom 5 in a standing position in which the axis of the jib 8 and the axis of the boom 5 are substantially parallel in a side view. Stored on the side of the.

  The second guide portion 42 is a pipe-like member that is bent in a substantially U-shape, and a pair of vertical shaft portions 42 a and 42 b extending perpendicularly to the side surface of the jib 8 and the axis of the jib 8. And an inclined shaft portion 42c (second abutting portion) for connecting the ends of the vertical shaft portions 42a and 42b (see FIG. 15). The inclined shaft portion 42 c is inclined so as to be away from the side surface of the jib 8 as it goes toward the tip side of the jib 8. That is, of the pair of vertical shaft portions 42 a and 42 b, the vertical shaft portion 42 a located on the distal end side of the jib 8 is formed to be longer than the vertical shaft portion 42 b located on the proximal end side of the jib 8. The pair of vertical shaft portions 42 a and 42 b and the inclined shaft portion 42 c are disposed in a plane substantially parallel to the lower surface 81 of the jib 8.

  The jib 8 projects from the storage position shown in FIGS. 1 to 8 to the front of the boom 5 through the lower holding position shown in FIGS. 9 to 11 by the following procedure. 9 to 11 correspond to FIGS. 2 to 4, respectively.

(1) When traveling, the wheel crane 100 is in a traveling posture in which the tip of the boom 5 is lowered obliquely downward as shown in FIG. When the jib 8 is extended, first, the outrigger is extended to the maximum, the vehicle body is leveled, and then the boom is raised and lowered so that the distal end side of the boom 5 is raised from the proximal end side as shown in FIG. The cylinder 5 is extended to raise the boom 5 to a predetermined undulation angle.

(2) The front end fixing pin 54 of the front end side fixing mechanism 50 is removed, the front end side of the jib 8 is released (see FIG. 7), and the storage lock pin 24 of the jib intermediate support mechanism 10 is removed (see FIG. 4).
In this state, the jib 8 is supported on the boom 5 by the automatic connection pin 16 and the storage fixing pin 17 (see FIG. 5).

(3) As shown by a two-dot chain line in FIG. 2, the boom 5 is slightly extended (about 1 m) and the jib support shaft 5a is moved further forward than the connecting portion 8a. Thereafter, by extending the hydraulic cylinder 15 of the jib intermediate support mechanism 10, the jib support frame 13 and the jib 8 connected thereto rotate around the support shaft 13a (rotate in the direction of arrow R1 in FIG. 4).

The turning operation of the jib 8 will be described with reference to FIGS.
12 and 13 are a schematic perspective view and a schematic cross-sectional view corresponding to FIG. 8, respectively, showing the movement of the jib from the storage position to the holding position. 12A to 12D correspond to FIGS. 13A to 13D, respectively. 12 and 13, (a) shows a state where the jib 8 is in the retracted position, (b) and (c) show a state during the transition to the holding position, and (d) shows the jib 8. Shows a state where is in the holding position.
14 and 15 are enlarged views of the vicinity of the jib intermediate support mechanism 10 and the guide members 30 and 40 (portions surrounded by a two-dot chain line in the drawing) in FIGS. 12 (a) and 12 (d), respectively. It is a schematic diagram.

Here, as described above, the center of gravity of the jib 8 is located closer to the tip side of the jib 8 than the jib intermediate support mechanism 10.
Further, as shown in FIG. 2, the central axis A2 of the support shafts 11a, 11a is set so that the axial center distal end side of the stored jib 8 is lower than the axial proximal end side with respect to the vertical axis. Tilted.
Further, as shown in FIG. 3, the central axis A <b> 1 of the support shaft 13 a is inclined with respect to the axis of the boom 5 so as to approach the side surface of the boom 5 toward the distal end side of the boom 5 in plan view. .
Therefore, the jib 8 is subjected to turning force in the direction of moving the position of the center of gravity to the lowest position in the vertical direction due to its own weight, so that the central axis A1 of the support shaft 13a is the axis of the boom 5 in plan view. Rotation power around the central axis A2 (rotation power in the direction of arrow S1 in FIGS. 3 and 12) so that it is parallel to the center (that is, the axis of the jib 8 is parallel to the axis of the boom 5). ) Acts. That is, the turning force around the central axis A <b> 2 acts on the jib 8 so that the tip of the jib 8 approaches the side surface of the boom 5 due to its own weight.
Then, the jib side guide member 40 abuts on the boom side guide member 30 to restrict the rotation of the jib 8 around the central axis A2 by the rotational force.

  When the jib 8 rotates about the central axis A1 (in the direction of arrow R1 in FIGS. 4 and 13) by extending the hydraulic cylinder 15, the jib 8 is urged from the boom side guide member 30 and is caused by the self-weight. It receives a force that rotates about the central axis A2 against the rotational force (force that rotates in the direction of arrow S2 in FIGS. 3 and 12). In other words, the jib 8 rotates about the central axis A1 and also rotates about the central axis A2 so that the connecting portion 8a rotates around the lower side of the boom 5.

The contact state between the boom-side guide member 30 and the jib-side guide member 40 when the jib 8 is rotated will be described in more detail.
As shown in FIGS. 12A and 13A, in the retracted state, the parallel shaft portion 41 b of the first guide portion 41 of the jib side guide member 40 is connected to the second rod-like portion 32 of the boom side guide member 30. Abut. In this state, the vertical shaft portions 41 a and 41 a of the first guide portion 41 of the jib-side guide member 40 are disposed substantially perpendicular to the second rod-shaped portion 32, and the parallel shaft portion 41 b is the axis of the boom 5. Are arranged substantially in parallel.

  As the hydraulic cylinder 15 extends, the jib 8 rotates so that the connecting portions 8a, 8a on both sides of the jib 8 are aligned in the horizontal direction. At this time, as shown in FIGS. 12B and 13B, the contact point between the first guide portion 41 on the jib side and the second rod-like portion 32 on the boom side gradually shifts downward, The vertical shaft portions 41 a and 41 a are gradually inclined so as to approach a state parallel to the second rod-shaped portion 32.

  Subsequently, after the parallel shaft portion 41b of the first guide portion 41 and the inclined shaft portion 42c of the second guide portion 42 both come into contact with the boom side guide member 30 (not shown), FIG. As shown in (c) and FIG. 13 (c), only the inclined shaft portion 42 c of the second guide portion 42 shifts to a state where it abuts on the second rod-like portion 32.

  Thereafter, as shown in FIGS. 12D and 13D, the jib 8 rotates until the connecting portions 8a and 8a on both sides of the jib 8 are aligned in the horizontal direction. In the state where the connecting portions 8a, 8a on both sides of the jib 8 are aligned in the horizontal direction, the vertical shaft portions 42a, 42b of the second guide portion 42 are disposed substantially perpendicular to the second rod-shaped portion 32, and the inclined shaft portion 42c. Is arranged substantially parallel to the axis of the boom 5.

  In the present embodiment, as described above, while the jib 8 is moved from the retracted position to the holding position by the hydraulic cylinder 15, the first guide portion 41 and the second guide portion 42 of the jib side guide member 40 are moved. Since at least one of them is in contact with the boom-side guide member 30, it is possible to stabilize the operation of the jib 8 during rotation.

  Further, the jib side guide member 40 and the jib side guide member 40 so that the tip end portion of the jib 8 does not interfere with the crane constituent members such as the plate-like frame 4 and the boom hoisting cylinder 7 and passes through a position close to the crane constituent member. The boom side guide member 30 is designed. In the present embodiment, the jib-side guide member 40 and the jib-side guide member 40 and the tip of the jib 8 do not move beyond the width of the upper swing body of the wheel crane 100 (the width indicated by W in FIG. 12) in plan view. The boom side guide member 30 is designed.

(4) After moving the jib 8 to the lower-holding position (state shown in FIG. 12D), as shown in FIGS. 9 and 10, the boom 5 is fully contracted, and the jib support shaft 5a at the tip of the boom 5 is used. , 5a are engaged with the connecting portions 8a, 8a at the base end of the jib 8, respectively. And these are inseparably connected by the jib holding pin 25.

  In this embodiment, when the hydraulic cylinder 15 is fully extended, the connecting portions 8a and 8a at the base end of the jib 8 are disposed at positions facing the jib support shafts 5a and 5a at the tip of the boom 5, respectively. The jib side guide member 40 and the boom side guide member 30 are designed. Therefore, by contracting the boom 5 in the state shown in FIG. 12 (d), the jib support shafts 5a and 5a at the tip of the boom 5 can be connected to the connecting portions 8a and 8a at the base end of the jib 8 without any additional positioning. Can be engaged respectively.

(5) After connecting the base end of the jib 8 to the tip of the boom 5, in the jib intermediate support mechanism 10, the retaining pin 21 is removed and the storage fixing pin 17 is removed (see FIG. 5). The pin 21 is inserted into the left jib holding pin 25 to prevent the left jib holding pin 25 from coming off. In this state, the jib 8 is connected to the jib support frame 13 only by the automatic connection pin 16.

(6) Next, the boom 5 is raised as shown in FIG. 16, and the boom 5 is slightly extended. When the boom 5 is extended, the jib 8 is supported by the auxiliary winding rope 61, the auxiliary hook 62, and the auxiliary rope 63 (see FIG. 17). As a result, the jib 8 is moved in the boom tip direction, and the automatic connection pin 16 is detached from the jib support frame 13.

(7) Then, as shown in FIG. 17, the auxiliary winding rope 61 is gradually lowered to suspend the jib 8 and the auxiliary rope 63 is removed.

(8) After that, as shown in FIG. 18, with the auxiliary hook 62 locked to the jib tip, while the boom 5 is tilted horizontally, the tip of the jib 8 is moved substantially horizontally. The rope 61 is wound up and the jib 8 is rotated around the jib support shafts 5a and 5a. Thus, after extending the jib 8 to the front of the boom 5, the suspension rod 64 is spanned between the boom head 5b and the jib 8 to complete the extension of the jib 8.

Next, a procedure for storing the jib 8 will be described.
The storage of the jib 8 can be basically performed by a procedure reverse to the procedure for overhanging the jib 8 described above.
Only the main points are described as follows.

(1) After the jib 8 is suspended as shown in FIG. 17 and supported by the auxiliary winding rope 61, the auxiliary hook 62, and the auxiliary rope 63, it is drawn toward the lower surface side of the boom 5 as shown in FIG. The automatic connecting pin 16 is automatically inserted into the pin hole 13b at the same time when the 13 is engaged with the jib side bracket 14 (see FIGS. 5 and 6).

19 is a schematic cross-sectional view taken along Z1-Z1 in FIG. In FIG. 19, the cross section of the boom 5 is omitted, and the position of the side surface of the boom 5 is indicated by a two-dot chain line.
As shown in FIGS. 19 and 15, the boom-side bracket 11 includes a rotation restricting portion 70 that restricts the intermediate frame 12 and the jib support frame 13 from rotating around the support shaft 11 a with respect to the boom-side bracket 11. Is provided.
The rotation restricting portion 70 includes a beam member 71 having one end fixed to the side surface of the boom side bracket 11 and the other end extending to the side of the boom 5 from the boom side bracket 11, and the beam member 71. It has a shaft portion 72 provided at the tip portion and fixed so as to protrude to the side facing the jib support frame 13, and a nut 73 screwed into the tip of the shaft portion 72. On the side surface of the jib support frame 13, a protrusion 13 d is provided at a position facing the nut 73.

The intermediate frame 12 and the jib support frame 13 are arranged around the support shaft 11a (in the direction of arrow S1 in FIG. 19) at a position where the protrusion 13d of the jib support frame 13 contacts the end surface of the nut 73 in a state where the hydraulic cylinder 15 is fully extended. Is restricted from rotating.
Then, the position of the jib support frame 13 when the projection 13d of the jib support frame 13 is in contact with the end surface of the nut 73 is the position of the jib support frame 13 when the jib 8 is in the holding position (FIG. 9). The screwing amount of the nut 73 is adjusted so as to be in the same position as in FIG.

As shown in FIG. 17, when the jib side bracket 14 is in a state before being connected to the jib support frame 13 and the boom 5 is inclined forwardly upward, the intermediate frame 12 and the jib support frame 13 are caused by their own weight. Is rotated around the central axis A2 (in the direction of arrow S1 in FIG. 19), and the projection 13d of the jib support frame 13 abuts against the nut 73. Thereby, the position of the jib support frame 13 can be arranged at a predetermined position that can be connected to the jib side bracket 14.
As a result, the jib side bracket 14 is reliably guided to the engaging position of the jib support frame 13 when the jib 8 is pulled toward the lower surface of the boom 5 in the step of retracting the jib 8. Thereby, it becomes easy to temporarily fix the jib 8 at the lower holding position (fixed by the automatic connecting pin 16).

(2) After temporarily fixing the jib 8 at the holding position, the boom 5 is tilted to the state shown in FIG. 9 (the state where the tip of the boom 5 is raised by about 1 to 5 ° with respect to the horizontal plane), and the jib holding pins on both sides 25 is removed, and the joints 8a, 8a of the jib 8 and the jib support shafts 5a, 5a of the boom 5 are unfixed. Further, the storage fixing pin 17 is set, and the common retaining pin 21 removed from one jib holding pin 25 is transferred to the storage fixing pin 17.

(3) In this state, the boom 5 is extended to separate the connecting portions 8a and 8a from the jib support shafts 5a and 5a.

(4) The hydraulic cylinder 15 is contracted to move the jib 8 from the holding position to the retracted position.
In this case as well, as in the case where the jib 8 is extended, the jib 8 has a turning force around the central axis A2 so that the tip of the jib 8 approaches the side surface of the boom 5 due to its own weight (see FIGS. 10 and 10). Therefore, the state where the jib guide member 40 is in contact with the boom guide member 30 is maintained. That is, by contracting the hydraulic cylinder 15, the jib 8 moves from the holding position to the retracted position in the order of (d), (c), (b), and (a) in FIGS.

(5) After the jib 8 is moved to the storage position, the storage lock pin 24 is inserted into the jib intermediate support mechanism 10, and then the front end fixing pin 54 is inserted into the front end side fixing mechanism 50. Thereby, the jib 8 can be fixed to the storage position.

  As described above, the wheel-type crane 100 includes the boom 5 having the jib support shafts 5a and 5a projecting on both side surfaces of the tip portion, and the connecting portion 8a that is detachably connected to the jib support shafts 5a and 5a. , 8a are provided with a jib 8 provided on both sides of the base end portion and a boom hoisting cylinder 7 provided on the lower surface side of the boom 5. The wheel type crane 100 holds the jib 8 in the retracted position on the side surface of the boom 5 in a laying posture in which the base end portion of the jib 8 faces the distal end side of the boom 5 and the connecting portions 8a and 8a on both sides are positioned vertically. Is possible. Then, from the retracted position, the connecting portions 8a, 8a on both sides of the jib 8 on the lower surface side of the boom 5 are in a lateral position so as to face the jib support shafts 5a, 5a on both sides of the boom 5, respectively. The connecting portions 8a and 8a are moved to the jib support shafts 5a and 5a through a step of moving the jib 8 to a lower holding position where the axis of the jib 8 is inclined with respect to the axis of the boom 5 in plan view so as to avoid the cylinder 7. It is possible to connect the jib 8 to the front end of the boom 5 with the connecting point as a fulcrum. Further, the jib 8 can be stored by the reverse procedure.

The jib overhanging storage device according to the first embodiment is provided on the boom 5 and can removably connect an intermediate portion of the jib 8 and extends substantially parallel to the axis of the boom 5 in a side view. The jib intermediate support mechanism 10 that supports the connected jib 8 so as to be rotatable about the center axis A1 of the support shaft 11a and the center axis A2 of the support shaft 11a extending substantially vertically when the boom 5 is in a horizontal state. It has. In the present embodiment, the central axis A2 is orthogonal to the central axis A1 in a side view.
Further, a boom side guide member 30 provided on the boom 5, a jib side guide member 40 provided on the jib 8, and a hydraulic cylinder 15 provided on the jib intermediate support mechanism 10 are further provided.
When the jib 8 in the retracted position is rotated about the central axis A1 by the urging force from the hydraulic cylinder 15, the jib side guide member 40 comes into contact with the boom side guide member 30 and the boom side guide. The jib 8 is rotated around the central axis A2 by the urging force from the member 30 and moved to the lower holding position.

According to this configuration, since the boom side guide member 30 and the jib side guide member 40 are provided, the operation of one hydraulic cylinder 15 causes the jib 8 stored on the side surface of the boom 5 to move around the central axis A1. And can also be rotated around the central axis A2 and moved to the hugging position.
Thus, the amount of protrusion of the jib 8 toward the side of the boom 5 at the storage position is reduced as compared with the configuration in which the jib 8 is rotated only around one rotation axis and moved from the storage position to the lower-holding position. be able to. Further, the configuration capable of reducing the protruding amount of the jib 8 to the side of the boom 5 in this way is a simple configuration using the one hydraulic cylinder 15, the boom side guide member 30, and the jib side guide member 40. Can be realized.

  In the jib overhanging storage device according to the first embodiment, the parallel shaft portion 41b of the first guide portion 41 abuts on the boom side guide member 30 and the shaft of the boom 5 when the jib 8 is in the storage position. Arranged parallel to the heart. Further, the inclined shaft portion 42 c of the second guide portion 42 contacts the boom side guide member 30 and is disposed in parallel with the axis of the boom 5 when the jib 8 is in the holding position.

  According to this configuration, when the jib 8 is in the retracted position, the boom-side guide member 30 and the parallel shaft portion 41b of the first guide portion 41 are in contact with each other, so that the jib 8 can be reliably positioned at the retracted position. .

  Further, when the jib 8 is in the lower-holding position, the boom-side guide member 30 and the inclined shaft portion 42c of the second guide part 42 are in contact with each other, and the jib 8 can be reliably positioned at the lower-holding position.

  Further, in the jib overhanging storage device according to the first embodiment, the jib intermediate support mechanism 10 can be rotated around the support shaft 11a with respect to the boom side bracket 11 fixed to the boom 5 and the boom side bracket 11. An intermediate frame 12 connected to the jib, a jib support frame 13 rotatably connected to the intermediate frame 12 around a support shaft 13a, and a jib side fixed to the jib 8 and connectable to the jib support frame 13. Bracket 14. The jib overhanging storage device makes contact with the jib support frame 13 when the jib side bracket 14 is connected to the jib support frame 13 in the step of storing the jib 8, so Is provided with a rotation restricting portion 70 for restricting the rotation.

  According to this configuration, the rotation of the intermediate frame 12 and the jib support frame 13 around the support shaft 11 a is restricted at a position where the projection 13 d of the jib support frame 13 contacts the end surface of the nut 73. Therefore, the positioning of the jib support frame 13 when connecting the jib support frame 13 and the jib side bracket 14 is facilitated.

(Second Embodiment)
Next, the jib overhanging storage device according to the second embodiment will be described.
FIG. 20 is an enlarged schematic perspective view of the vicinity of the jib intermediate support mechanism 10 and the guide members 30 and 40 ′ of the jib overhanging storage device according to the second embodiment. FIG. 21 is a schematic cross-sectional view showing the movement of the jib 8 when moving from the storage position to the hugging position.
The jib overhanging storage device according to the second embodiment includes a guide plate 43 (third contact portion) between the parallel shaft portion 41 b of the first guide portion 41 and the inclined shaft portion 42 c of the second guide portion 42. This is different from the first embodiment. Since the other parts are the same, the same members are denoted by the same reference numerals and the description thereof is omitted.

  As shown in FIG. 20, the guide plate 43 is disposed between the parallel shaft portion 41b and the inclined shaft portion 42c, and is a metal plate that curves so as to protrude in the direction away from the jib 8 (the direction toward the boom 5). It is.

  As shown in FIG. 21A, in the retracted position, the first guide portion 41 is in contact with the boom-side guide member 30 as in the first embodiment. When the hydraulic cylinder 15 is extended from this state, as shown in FIGS. 21B and 21C, the jib 8 is rotated around the central axis A1 while the guide plate 43 is brought into contact with the boom-side guide member 30 (FIG. It rotates in the direction of arrow R1 in a). Then, as shown in FIG. 21 (d), the jib 8 rotates to the lower holding position, and the second guide portion 42 contacts the boom side guide member 30. In this manner, the guide plate 43 is in continuous contact with the boom-side guide member 30 while the jib 8 moves between the retracted position and the lower-holding position.

  Therefore, by adjusting the shape of the guide plate 43, the separation distance between the jib and the boom in the middle of moving the jib 8 from the retracted position to the holding position can be continuously adjusted. That is, the separation distance between the jib 8 and the boom 5 at the storage position is determined by the shape of the first guide portion 41, and the separation distance at the lower holding position is determined by the shape of the second guide portion 42. In the jib overhanging storage device according to the second embodiment, by appropriately adjusting the shape of the guide plate 43, the separation distance in the middle of the transition from the storage position to the hugging position can be set as a desired separation distance. As a result, by adjusting the shape of the guide plate 43 according to the shape of the member or frame mounted on the upper swing body, the tip of the jib 8 is moved when the jib 8 is moved from the retracted position to the holding position. It becomes easy to make it the structure which does not interfere with the member which comprises a crane, and the locus | trajectory of the said tip approaches the boom 5 side surface more.

  Since the guide plate 43 is provided between the first guide part 41 and the second guide part 42, the first guide part 41, the second guide part 42, and the guide plate 43 are configured. The strength of the jib side guide member 40 ′ can be increased.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

The side surface schematic diagram of a wheel type crane provided with the jib overhanging storage device concerning a 1st embodiment of the present invention. The side surface schematic diagram of the boom vicinity part of the wheel type crane shown in FIG. The plane schematic diagram of the boom vicinity part shown in FIG. The X1-X1 cross-sectional arrow schematic diagram in FIG. The Y1 direction arrow schematic diagram of the connection part in FIG. FIG. 6 is a schematic view taken along the line Y2-Y2 in FIG. X2-X2 cross-sectional arrow schematic diagram in FIG. The X3-X3 cross-sectional arrow schematic diagram in FIG. The side surface schematic diagram of a boom vicinity part when a jib exists in a lower holding position. The plane schematic diagram of the boom vicinity part shown in FIG. X1'-X1 'cross section arrow schematic diagram in FIG. The perspective schematic diagram which shows the motion of the jib from a retracted position to a lower holding position. The cross-sectional schematic diagram which shows the motion of the jib from a retracted position to a lower holding position. FIG. 13 is an enlarged schematic view of a jib intermediate support portion and a guide portion vicinity portion in FIG. FIG. 13 is an enlarged schematic view of a jib intermediate support portion and a guide portion vicinity portion in FIG. The schematic diagram for demonstrating the overhang | projection of the jib from a lower holding position. The schematic diagram for demonstrating the overhang | projection of the jib from a lower holding position. The schematic diagram for demonstrating the overhang | projection of the jib from a lower holding position. The Z1-Z1 cross-sectional arrow schematic diagram in FIG. The expansion schematic diagram of the jib intermediate | middle support part and guide part vicinity part of the jib overhanging storage apparatus which concerns on 2nd Embodiment. The cross-sectional schematic diagram which shows the motion of the jib from a retracted position to a lower holding position.

Explanation of symbols

5 Boom 5a Jib support shaft (jib base end support part)
8 Jib 8a Connecting portion 10 Jib intermediate support mechanism A1 Central axis (first rotation axis)
A2 Center axis (second rotation axis)
15 Hydraulic cylinder 30 Boom side guide member 40, 40 'Jib side guide member 41b Parallel shaft part (first contact part)
42c Inclined shaft part (second contact part)
43 Guide plate (third contact part)
70 Rotation restriction part

Claims (4)

A boom provided with jib proximal end support portions on both side surfaces of the distal end portion, and a jib provided with connecting portions detachably connected to the jib proximal end support portion on both sides of the proximal end portion, The jib can be held in a stowed position on the side of the boom in a laying posture with the base end of the jib facing the distal end side of the boom, and the connecting portion is located below the boom from the stowed position. The connecting part is connected to the jib base end supporting part through a step of moving the jib to a lower holding position facing the jib base end supporting part, and the jib is used as a fulcrum as the boom. A jib overhanging storage device provided in a mobile crane capable of overhanging the tip of the front end, and capable of moving the jib to the storage position by a reverse procedure.
A middle part of the jib provided on the boom is detachably connectable, and the connected jib extends in a longitudinal direction of the boom in a side view and the first rotation shaft in a side view. A jib intermediate support mechanism that supports the second rotation shaft tilted with respect to the first rotation shaft so as to be rotatable about the second rotation shaft;
A boom side guide member provided on the boom;
A jib side guide member provided on the jib;
A hydraulic cylinder provided in the jib intermediate support mechanism;
With
When the jib in the storage position is rotated around the first rotation shaft by the biasing force from the hydraulic cylinder, the jib side guide member abuts on the boom side guide member and The jib overhanging storage device in which the jib is rotated about the second rotation axis by the urging force from the boom side guide member and moves to the lower holding position. The jib side guide member is
A first contact portion that contacts the boom-side guide member when the jib is in the retracted position;
A second abutting portion that abuts against the boom side guide member when the jib is in the under-holding position;
The jib overhanging storage device according to claim 1. The jib side guide member is
A first contact portion that contacts the boom-side guide member when the jib is in the retracted position;
A second abutting portion that abuts against the boom side guide member when the jib is in the under-holding position;
A third contact that is provided between the first contact portion and the second contact portion and contacts the boom side guide member when the jib moves between the retracted position and the lower holding position. The tangent,
The jib overhanging storage device according to claim 1 or 2, further comprising: The jib intermediate support mechanism is
A boom side bracket fixed to the boom;
An intermediate frame rotatably connected to the boom side bracket about the second rotation axis;
A jib support frame rotatably connected to the intermediate frame about the first rotation axis;
A jib side bracket fixed to the jib and connectable to the jib support frame;
Have
Rotation that restricts the jib support frame from rotating about the second rotation axis together with the intermediate frame in a state where the jib support frame is rotated about the first rotation axis to the lower holding position. The jib overhanging storage device according to any one of claims 1 to 3, further comprising a restriction unit.

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