JP3537233B2 - Apparatus and method for exchanging wire rope during jib overhang and storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for exchanging a wire rope at the time of extending and storing a jib of a mobile crane.

[0002]

2. Description of the Related Art Some mobile cranes have a jib in addition to a telescopic boom. Such a jib-mounted crane is shown, for example, in FIG. Hereinafter, a conventional jib-mounted mobile crane will be described with reference to FIG. The mobile crane has an upper swing body 8 that can swing freely on a lower traveling body 1 having wheels, and has a boom 3 that can extend and contract freely at substantially the center of the upper swing body 8. In order to maintain the stability of the vehicle body during crane work,
Outriggers 2 are provided on the front, rear, left and right of the vehicle. Boom 3
Is composed of a base boom 4, an intermediate boom 5, and a tip boom 6 for a three-stage telescopic boom, for example.

The main hook 10 has a main hook 10 at the end of a wire rope 11 for the main hook suspended from the end of the end boom 6, and a load is lifted by the main hook 10. Then, the hoisting load can be moved to a predetermined height and position by raising and lowering the wire rope 11 or performing expansion and contraction, undulation and turning of the boom 3 by a winch operation. However, depending on the surroundings of the work site where the mobile crane is installed, the work range of only the boom 3 is narrow, so there is a case where the work range needs to be further expanded.

In order to cope with such an expansion of the working range, the jib 7 is connected to the tip of the tip boom 6 so that the work can be performed with the jib 7. The jib 7 is disconnected from the distal boom 6 when not in use, and is stored, for example, on the left side of the proximal boom 4 in the example of FIG. When used, the tip boom 6 and the jib 7 are rotatably connected by connection pins 35a and 35b provided on the left side surface of the tip of the tip boom 6 so as to be rotatable, and an angle range extending from the side of the tip boom 6 to the front. The jib 7 is rotated around the connecting pins 35a, 35b to protrude forward of the distal end boom 6.

The jib 7 includes a jib body 40 and a jib body 40.
And a jib up / down cylinder 50 for raising and lowering the jib body 40 with respect to the jib bracket 30. The jib bracket 30 and the jib body 40 are rotatably connected by a pivot pin 31 that is in a horizontal plane and that is perpendicular to the longitudinal axis of the jib body 40. The jib hoist cylinder 50 and the jib bracket 30 are connected to the pivot pin 3.
By means of a pivot pin 51 parallel to 1
0 and the jib body 40 are connected to the pivot pin 5 parallel to the pivot pin 31.
2, they are connected rotatably. The expansion and contraction of the jib up / down cylinder 50 causes the jib bracket 30
The jib body 40 is raised and lowered around the pivot pin 31.

The auxiliary hook 2 is provided on the upper surface of the distal end of the distal boom 6.
Guide sheave 22 for guiding wire rope 21 for zero
A front sheave 23 for guiding the wire rope 21 from the guide sheave 22 to the auxiliary hook 20 is provided on the front surface of the front end of the front boom 6. A wire rope 2 for the auxiliary hook 20 is provided on the upper surface of the jib bracket 30.
A guide sheave 32 for guiding the jib 1 to the tip of the jib body 40 is provided. When the jib 7 is not used, the wire rope is wound up and down via the tip sheave 23. At the time of hanging load work on the jib 7, the auxiliary hook 20 is used, so it is necessary to change the wire rope 21. The wire rope 21 is detached from the tip sheave 23, and after the jib is extended, the jib body 40 passes from the guide sheave 22 at the tip end of the tip boom 6 via the guide sheave 32.
It is led to the sheave at the tip of the jig and used for jib work.

Normally, the jib 7 is used when the base boom 4 is not used.
Stored on the side. In order to fix the jib body 40 when the jib 7 is stored on the left side surface of the base boom 4, brackets are provided on the base boom 4 and the jib body 40, respectively. FIG. 11 shows the jib body 4 attached to the base boom 4.
It is a top view in the state where 0 was fixed. Jib body 40
A bracket 46 having locking pins 46a and 46b is fixed at a substantially central position on the right side of the jib body 40, and a bracket 47b is fixed to a tip 40b on the right side of the jib body 40. Also,
On the left side surface of the base boom 4, the brackets 45 and 47a are fixedly provided at predetermined positions corresponding to the brackets 46 and 47b, respectively.

Each of the brackets 47a and 47b is provided with a hole into which a fixing pin 48 is inserted. When the jib is stored, the holes are aligned and fixed by the fixing pin 48.
FIG. 12 is a Y view of the bracket 45 and the bracket 46 in FIG. The bracket 45 has holes 45 a and 45 b penetrating in the longitudinal direction of the base boom 4. The bracket 46 has locking pins 46a and 46b that are inserted into and engaged with the holes 45a and 45b from the front of the base boom 4 respectively. When the jib is stored, the jib body 40 is fixed to the base boom 4 with the locking pins 46a and 46b engaged with the holes 45a and 45b, respectively.

FIG. 13 is a plan view of a connecting portion between the end boom 6 and the jib bracket 30, which will be described below in detail with reference to FIG. Brackets 27a and 27b are provided vertically on the left side surface 6a of the tip of the tip boom 6, and brackets 28a and 27b are respectively provided on the right side surface 6b.
8b is provided. When the jib 7 is stored on the left side of the base boom 4 and the front of the boom 3 is viewed, brackets 33a and 33b are provided vertically on the right side of the tip of the jib bracket 30, respectively. Are provided with upper and lower brackets 34a and 34b, respectively. Each bracket is provided with a connection hole, and each bracket 27a
33a, 27b and 33b, 28a and 34a, 28b and 34b are connected by connecting pins 35a, 35b, 36a and 36b, respectively. In this embodiment, the connecting pin 3
The axis connecting the cores of 5a and 35b is included in the vertical plane, and at the same time, faces in the direction perpendicular to the longitudinal axis of the boom 3.

A turning cylinder 55 is provided for turning the jib 7 about the connecting pins 35a and 35b with respect to the end boom 6 by approximately 180 degrees. A bracket 37 is provided on the right side of the rear end of the jib bracket 30 (close to the jib body 40).
And one end of the rotary cylinder 55 is rotatably attached to the bracket 37 by a pivot pin 38. The other end of the rotating cylinder 55 is attached to one end of a bracket 56. The other end of the bracket 56 is rotatably connected to a link member 57 and one end of the link member 58 by a pivot pin 59. A bracket 25 is provided on the left side surface 6a of the tip of the tip boom 6, and the other end of the link member 57 is
5 is rotatably connected to a pivot pin 26. The other end of the link member 58 is rotatably connected by a pivot pin 39 near the distal end of the bracket 33a at the upper part of the right side of the distal end of the jib bracket 30.

The pivot pins 26, 59, 39 and the connecting pin 3
5a forms a four-bar link. Now, when the rotation cylinder 55 is extended, the pivot pin 59 is pushed forward of the tip boom 6, and the four-bar link acts in a direction in which the angle formed by the link members 57 and 58 opens. As a result, the pivot pin 26 and the pivot pin 39 receive a force in a direction away from each other around the connection pin 35a, so that the jib bracket 30 moves the connection pin 35a forward of the tip boom 6.
Will rotate around. When the rotary cylinder 55 is reduced, the pivot pin 59 is pulled rearward of the tip boom 6 in the opposite direction, and the four-bar link acts in a direction in which the angle formed by the link members 57 and 58 decreases. Therefore, the jib bracket 30 rotates around the connecting pin 35a to the side of the end boom 6.

In such a configuration, when the jib 7 is used, the jib 7 is extended and connected to the tip of the tip boom 6, and then the wire rope 21 for the auxiliary hook 20 is used.
To guide the wire from the tip of the tip boom 6 to the tip of the jib body 40, the wire rope 21 needs to be replaced. FIG. 14 shows a procedure of a method of extending the jib 7 and replacing the wire rope 21. FIGS. 15 to 18 are diagrams for explaining this procedure. The details will be described below with reference to FIGS. In the following description, each step of the procedure is represented by “S”. FIG.
Represents the initial state of the procedure. Here, it is assumed that the outrigger 2 of the undercarriage 1 is extended to the maximum length in preparation for the jib overhang work.

(S21) The boom 3 is set to be substantially horizontal and in the most reduced state. (S22) The winch is lowered, the wire rope 21 for the auxiliary hook is loosened (the state of the wire rope 21a in FIG. 15), and the auxiliary hook 20 is grounded on the ground GL to lie down. (S23) Pull out the fixing pin 48 (see FIG. 11) of the jib 7 and use a human-powered or hydraulic actuator or the like to remove the jib bracket 3
0 is pushed to the end boom 6 side. (This operation is referred to as "shaking the jib.")

(S24) The connection holes of the brackets 27a and 27b on the left side surface 6a of the tip of the tip boom 6 and the bracket 33a at the front right end of the jib bracket 30;
33b and the connecting pins 35a, 35b.
Are inserted and connected. (S25) The wire rope 21 for the auxiliary hook is detached from the tip sheave 23 and hangs on the right side of the tip boom 6. (State of wire rope 21 in FIG. 15)

(S26) The boom 3 is gradually raised to a predetermined angle. At this time, the boom 3 is raised while loosening the wire rope 21 so that the auxiliary hook 20 can be kept in contact with the ground. (S27) The boom length is extended from the most reduced state by a predetermined length.

FIG. 16 shows a side view of the mobile crane at this time. As the boom 3 is raised, the wire rope 21 is guided by the guide sheave 22 on the upper surface of the distal end of the distal boom 6.
From the right side of the tip boom 6. When the boom length is extended from the minimum contracted state by a predetermined length, the end of the jib bracket 30 is connected to the connecting pins 35a, 3b.
Since the jib body 40 is connected to the distal end boom 6 by 5b, the jib main body 40 is pulled up in front of the boom as the boom 3 is extended. Therefore, the locking pins 46a, 46b of the jib 7 are pulled out of the holes 45a, 45b of the bracket 45. (See FIG. 12) In this state, the jib up / down cylinder 50 is locked in the stopped state, and the jib body 40 is supported by the jib bracket 30 by the jib up / down cylinder 50.

(S28) The jib hoist cylinder 50 is operated to lower the jib body 40 so that it is substantially perpendicular to the longitudinal axis of the boom 3. The situation at this time is shown in FIG. The jib body 40 is rotated about the pivot pin 31 by the jib hoist cylinder 50 to be at the position 40a, and is oriented substantially perpendicular to the longitudinal axis of the boom 3. At this time, since the boom 3 is raised by a predetermined angle and is extended by a predetermined boom length, the jib tip is near the ground GL.

(S29) The rotating cylinder 55 is extended to connect the jib bracket 30 and the jib body 40 to the connecting pin 35.
The jib main body 40 is turned 180 degrees around a and 35b, and the jib main body 40 is extended in front of the front end boom 6 (at a position 40b in FIG. 17).

(S30) While operating the jib hoist cylinder 50 to rotate the jib body 40 around the pivot pin 31 and raise it, the boom 3 is gradually lowered to bring the jib body 40 and the boom 3 into a substantially horizontal state. . FIG. 18 shows this state. When the jib body 40 and the boom 3 are substantially horizontal, the auxiliary hook 20 is laid down at the same position 20a as when it was placed on the ground GL in the initial stage of the procedure, that is, near the tip of the tip boom 6.

(S31) The positions of the holes of the brackets 28a, 28b on the right side 6b of the distal end of the distal end boom 6 and the holes of the brackets 34a, 34b of the jib bracket 30 are aligned, and the connecting pins 36a, 36b are inserted respectively. And connect. (See FIG. 13) (S32) Connect the auxiliary hook 20 and the wire rope 21 to the jib 7
, And inserts the wire rope 21 into the guide sheave 32 on the upper surface of the jib bracket 30 and the guide sheaves 41 and 42 at the tip of the jib body 40. At this time, as shown in FIG. 18, the operator moves the auxiliary hook 20 to a position 20b near the tip of the jib 7. Further, in order to change the wire rope 21, the operator also moves with the wire rope 21.

[0021]

As described above, in the conventional jib extension method, after the extension of the jib 7 is completed, the operator moves the auxiliary hook 20 from near the tip of the boom 3 to the tip of the jib 7. You must move to a nearby location. At this time, since the operator moves with the heavy auxiliary hook 20, there is a problem that the workability is not good and the degree of fatigue of the operator increases.

When the wire rope 21 is replaced,
Since this rope is heavy, the operator can use the wire rope 21
Is moved while contacting the ground. At this time, the wire rope 21 becomes dirty.
At the time of winding on a winch drum.

Further, it is necessary to change the wire rope 21 after the extension of the jib 7 is completed. However, this changing work is a very troublesome work, and a heavy burden is imposed on the operator. Therefore, there is an increasing demand for labor saving in the work of replacing the wire rope 21. However, a good method for facilitating the work of exchanging the wire rope when the jib is extended has not been proposed so far.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and enables the auxiliary hook to be easily attached and detached without moving with the auxiliary hook and the wire rope, and the hook of the wire rope. It is an object of the present invention to provide a wire rope changing device and method for extending and storing a jib which can save labor of changing work.

[0025]

The first invention of the wire rope changing device at the time of jib extension and storage according to the present invention is as follows.
It projects the jib stored in the boom side of the mobile crane and connecting the boom and jib boom tip portion, the auxiliary off
Hook wire rope from the end of the boom to the end of the jib.
In the wire rope changing device when the jib is extended and retracted, the boom is moved from the side position to the lower vertical position.
In when rotated in a vertical plane along the jib longitudinal axis of the boom, under hanging the boom opposite at the time of stowing the jib
Engage wire rope for geta auxiliary hook, the engagement
And it has an engagement means for rotating the wire rope with jib and arranged in the boom opposite sides at the time of stowing the jib of the tip of the jib <br/>.

Further, in the above-mentioned wire rope changing device at the time of jib extension and storage, the jib is retracted before the jib is rotated with respect to the boom around the rotation axis in the vertical plane.
A locking means is provided at the base end of the jib for locking a wire rope for an auxiliary hook hanging down to the opposite side and releasing the locking together with the rotation of the jib about the rotation axis. You may.

Further, it overhangs the jib stored in the boom side of the mobile crane and connecting the boom and jib boom tip portion, a wire rope of the auxiliary hook boom ahead
In the jib overhanging and retracting device in which the jib is extended from the end to the tip of the jib, the jib retracts before the jib pivots around the pivot axis in the vertical plane with respect to the boom .
Wire Hollow auxiliary hook lowered dripping and the boom on the other side
Locking the-loop, and may be arranged a locking means for the locking is released together with the rotation axis of the rotation of the jib to the proximal end of the jib.

The jib extension and storage method according to the present invention is also directed to a jib extension in which a jib is stored on a side surface of a boom of a mobile crane and an auxiliary hook is attached to the jib. When the jib is extended from the side of the boom in the method of changing the wire rope at the time of storage, a) the boom is placed in a state substantially parallel to the ground, and the auxiliary hook is grounded to the ground to loosen the wire rope. b) lock the wire rope to the wire locking means of the jib; c) raise the boom to a predetermined angle and remove the locking pin that extends and locks the jib to the boom side; d) the jib Down to a predetermined angle, engage the wire rope with the engagement means at the jib tip, e) rotate the jib 180 degrees forward from the side of the boom, and f) make the boom substantially parallel to the ground. Prone, raise jib, g) Engaging the Iyaropu the jib tip of the guide sheaves
When the jib is stored on the side of the boom in accordance with the procedure, the wire rope is replaced in the reverse procedure.

[0029]

The jib is provided with a wire rope engaging means at the distal end thereof. When the jib leans on the boom along the longitudinal axis of the boom, the wire rope hanging from the base end of the jib is engaged with the jib. The means can be engaged. Thereby, the wire rope is automatically engaged with the jib tip. Thereafter, the jib is rotated by 180 degrees to protrude in front of the boom, and the jib is raised while the boom is lying down to bring the boom and the jib into a substantially horizontal state. Accordingly, the auxiliary hook naturally moves together with the jib tip, and the wire rope is engaged with the sheave on the upper surface of the base end of the jib. The wire rope engaged with the engaging means is finally replaced with a guide sheave at the tip of the jib after the jib and the boom are brought into a substantially horizontal state. This eliminates the need for the operator to travel long distances with heavy auxiliary hooks and wire ropes.

Further, a locking means is provided at the base end of the jib. Before the jib is extended, the wire rope guided from the tip of the boom is hooked on the locking means via the guide sheave on the upper surface of the base end of the jib, and the auxiliary hook side of the wire rope is hung on the left side of the jib. Keep it. In this state, the boom is raised to a predetermined angle while applying tension to the wire rope by the weight of the auxiliary hook, and the jib is lowered along the longitudinal axis of the boom with respect to the boom, and the jib is substantially perpendicular to the longitudinal axis of the boom. To face the direction. At this time, the wire rope can keep the state engaged with the guide sheave on the upper surface of the jib base end.

Thereafter, the jib is rotated 180 degrees to project forward of the boom, and the jib is raised while the boom is lying down, thereby bringing the boom and the jib into a substantially horizontal state. At this time, the auxiliary hook moves together with the jib distal end, and the wire rope is engaged with the guide sheave on the upper surface of the jib base end and the guide sheave on the jib distal end. Along with this, the wire rope is naturally released from the locking means,
There is no need to replace the wire rope.

In the above, when the engaging means is not provided, the operator may manually engage the wire rope with the guide sheave at the tip of the jib. At this time, similarly, the jib is rotated by 180 degrees and extended to the front of the boom,
Thereafter, even when the boom and the jib are in a substantially horizontal state, the wire rope can be kept engaged with the guide sheave on the upper surface of the jib base end by the above-described locking means at the jib base end.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS. In the following description, the component numbers used in the following description are the same as those used in the description of the related art. FIG.
FIG. 2 is a side view of the wire rope changing device at the time of jib extension and storage according to the present invention. Here, a description will be given of a difference of the configuration according to the present invention from the related art.

An engaging means 60 for the wire rope 21 is provided on the end of the main body jib 40 and on the side opposite to the boom 3 when the jib is stored. The engagement means 60 includes the jib body 4.
When the “0” is laid down on the jib bracket 30 along the longitudinal axis of the boom 3, the wire rope 21 hanging from the base end of the jib body 40 is locked and engaged. In this embodiment, since the jib 7 is stored on the left side of the boom 3, the engaging means 60 is provided on the left side of the jib body 40. In the present embodiment, the engaging means 60 includes a sheave 61, a first guide 62, and a second guide 63.

A locking means 70 is provided on the upper surface of the base end (jib bracket side) of the jib body 40. Before the jib 7 is extended, the locking means 70 hangs the wire rope 21 guided from the upper surface of the tip end of the tip boom 6, and attaches the auxiliary hook 20 to the side (the left side in this embodiment) of the jib body 40. It hangs down below. The locking means 7
0 may be provided on the upper surface of the jib bracket 30.

A guide roller 71 for the wire rope 21 is provided on the upper surface of the distal end of the distal boom 6, and a guide roller 72 is provided on the upper surface of the jib bracket 30. These guide rollers 71 and 72 are connected to the wire rope 21 from the guide sheave 22 on the upper surface of the distal end of the distal boom 6.
Via the upper surface of the jib bracket 30
This is for guiding smoothly to zero.

FIG. 2 is a diagram showing details of the engagement means 60, and will be described below with reference to FIG. A sheave 61 is provided on the left side surface of the tip of the jib body 40 with its axis perpendicular to the left side surface. A first guide 62 is provided above the sheave 61 so as to protrude leftward from the tip of the jib body 40. The projecting length of the first guide 62 is longer than the maximum outer shape in the width direction of the sheave 61 and has a predetermined length such that the hanging wire rope 21 can be hooked on the left side surface of the jib body 40. . And the first guide 6
The tip of 2 is bent like a hook so that the hooked wire rope 21 does not come off.

Further, below the sheave 61, a sheave 61 is provided.
A second guide 63 having a gentle slope that is convex in the axial center direction is provided. The inclined portion 63a gradually rises from the left side surface of the jib body 40 as approaching the sheave 61 from below the sheave 61;
And an inclined portion 63b in which the height closest to the maximum height is higher than the maximum outer shape in the width direction of the sheave 61. In this embodiment, the second guide 63 is formed by bending a cylindrical member gently.

FIGS. 3 and 4 are a plan view and a side view of the distal end boom 6 and the jib 7 showing the locking means 70 and the related wire rope guide rollers in detail. Hereinafter, description will be made with reference to FIGS. A guide roller 71 is provided on the front side of the guide sheave 22 disposed on the upper surface of the distal end portion of the distal end boom 6. Guide roller 71
Is composed of a bracket 71a and rollers 71b and 71c. The bracket 71 a rotatably supports the rollers 71 b and 71 c and is attached to the upper surface of the distal end portion of the distal end boom 6. The direction of the rotation axis of the rollers 71 b and 71 c is perpendicular to the longitudinal axis of the end boom 6. The wire rope 21 from the guide sheave 22 is
It is led to the upper surface of the jib 7 via b and 71c.

A guide roller 72 is provided on the upper surface of the distal end of the jib bracket 30. The guide roller 72 includes a bracket 72a and rollers 72b and 72c. The bracket 72a rotatably supports the rollers 72b and 72c, and is attached to the upper surface of the distal end of the jib bracket 30. The direction of the rotation axis of the rollers 72b, 72c is perpendicular to the longitudinal axis of the jib bracket 30. Wire rope 21 from the rollers 71b and 71c
Is guided to the upper surface of the jib body 40 via the rollers 72b and 72c and the guide sheave 32.

The base end of the jib body 40 (the jib bracket 3
A locking means 70 is provided on the upper surface (close to 0). The locking means 70 is connected to the wire rope 2 from the guide sheave 32.
The rope is locked when the jig 1 is gently hung on the left side surface of the jib body 40. Wire rope 2
In this embodiment, the locking means 70 is formed of a cylindrical member so as not to damage the member 1. However, the locking means 70 is not limited to this and may be a guide roller or the like. This cylindrical member or guide roller is oriented such that the direction of this axis is the jib body 40.
Is mounted so as to be perpendicular to the longitudinal axis.

Next, the operation of the above configuration will be described together with the description of the method of exchanging the wire rope when the jib is extended and stored according to the present invention. FIG. 5 shows the procedure of the jib overhang method, and FIGS. 6 to 9 are diagrams for explaining this procedure. The details will be described below with reference to FIGS. Note that, similarly to the above, each step of the procedure is represented by “S”. FIG. 6 shows an initial state of the procedure. Here, as preparation for the jib overhanging operation, it is assumed that the outriggers 2 provided on the front, rear, left and right of the lower traveling body 1 of the mobile crane are overhanging to the maximum length.

(S1) The boom 3 is set to be substantially horizontal and in the most reduced state. (S2) The winch is lowered to loosen the wire rope 21 for the auxiliary hook (the state of the wire rope 21a in FIG. 6),
The auxiliary hook 20 is brought into contact with the ground GL to lie down. (S3) Pull out the fixing pin 48 (see FIG. 11) of the jib 7,
The jib bracket 30 is pushed toward the distal end boom 6 by human power or a hydraulic actuator. (This operation is referred to as "shaking the jib.")

(S4) Left side surface 6 at the tip of tip boom 6
a of the brackets 27a and 27b, and brackets 33a and 3b at the front right end of the jib bracket 30.
3b and the connecting pins 35a, 35b.
b is inserted and connected. (S5) The wire rope 21 for the auxiliary hook is removed from the tip sheave 23, and the guide roller 71 on the top face of the tip of the tip boom 6 and the guide roller 7 on the top face of the jib bracket 30.
2 and the guide sheave 32 and the wire rope 21 via the locking means 70 on the upper surface of the main body jib 40.
Hang on the left side of. (State of the wire rope 21 in FIG. 6)

(S6) The boom 3 is gradually raised to a predetermined angle. At this time, the boom 3 is raised while hanging the auxiliary hook 20 and applying tension to the wire rope 21. (S7) The boom length is extended by a predetermined length from the most reduced state.

FIG. 7 shows a side view of the mobile crane at this time. As the boom 3 occurs, the wire rope 21 keeps hanging from the locking means 70 on the upper surface of the jib body 40 to the left side surface of the jib body 40. When the boom length is extended by a predetermined length from the minimum contracted state, the distal end of the jib bracket 30 is connected to the distal end boom 6 by the connecting pins 35a and 35b. Raised to the front of the boom. Therefore, the locking pins 46a and 46b of the jib 7
Holes 45a, 45b. (See FIG. 12.) In this state, the jib up / down cylinder 50 is locked in the stopped state, and the jib body 40 is connected to the jib bracket 30.
Are supported by a jib hoist cylinder 50.

(S8) The jib up / down cylinder 50 is operated to lower the jib body 40 so as to be substantially perpendicular to the longitudinal axis of the boom 3. At this time, the wire rope 21 is engaged with the engaging means 60 at the distal end of the jib body 40. The situation at this time is shown in FIG. The jib body 40
It is rotated around the pivot pin 31 by the jib up-and-down cylinder 50 to reach the position 40a, and is oriented substantially perpendicular to the longitudinal axis of the boom 3. At this time, the engaging means 60 at the distal end of the jib main body 40 is locked by the locking means 70 and passes near the wire rope 21 hanging down below the side surface of the jib main body 40. And the wire rope 21
Are locked by the first guide 62 of the engagement means 60. When the wire rope 21 is hanging so close that it contacts the left side surface of the jib body 40, the wire rope 21 moves along the inclined portions 63 a and 63 b of the second guide 63 of the engagement means 60 with the rotation. As a result, the wire rope 21 is locked by the first guide 62 over the sheave 61. (See FIG. 2) When the boom 3 is raised by a predetermined angle,
Also, since the jib is extended by the predetermined boom length, the jib tip is near the ground GL.

(S9) The rotary cylinder 55 is extended to connect the jib bracket 30 and the jib body 40 to the connecting pin 35a.
The jib body 40 is rotated 180 degrees around 35b, and the jib main body 40 is extended in front of the end boom 6 (at a position 40b in FIG. 8). With this rotation, the wire rope 21 locked by the first guide 62 of the engagement means 60 naturally moves to the sheave 61.
In the groove.

(S10) The boom 3 is gradually lowered while the jib up / down cylinder 50 is extended and the jib main body 40 is rotated around the pivot pin 31 and raised, and the jib main body 40 and the boom 3 are brought into a substantially horizontal state. I do. FIG. 9 shows this state. When the jib body 40 and the boom 3 are substantially horizontal, the auxiliary hook 20 is automatically attached to the tip of the jib body 40.

(S11) The positions of the holes of the brackets 28a and 28b on the right side surface 6b of the tip of the tip boom 6 and the holes of the brackets 34a and 34b of the jib bracket 30 are aligned, and the connecting pins 36a and 36b are inserted respectively. And connect. (See FIG. 13) (S12) The wire rope 21 is connected to the sheave 6 of the engagement means 60.
1 and is engaged with guide sheaves 41 and 42 at the distal end of the jib body 40.

As described above, the locking means 70 is provided on the upper surface on the base end side of the jib body 40, and the wire rope 21 from the guide sheave 32 on the upper surface of the jib bracket 30 is locked before the jib 7 is extended. Jib body 40 locked by 70
Hang it on the left side of. The locking means 70 is formed of a cylindrical member, and since this cylindrical axis is disposed perpendicular to the longitudinal axis of the jib body 40, the wire rope 21 is smoothly curved without being damaged. Can be hung on the left side surface of the jib body 40.

In this state, as shown in FIG.
The jib body 40 faces down along the longitudinal axis of the boom 3 with respect to 0 so that the jib body 40 is oriented substantially perpendicular to the longitudinal axis of the boom 3. At this time, the first guide 62 of the engaging means 60 provided at the distal end of the jib body 40 is
Automatically locks the wire rope 21 hanging therefrom. After that, the jib body 40 is
When it rotates 0 degrees and projects forward of the boom 3, the engagement means 6
The wire rope 21 locked by the first guide 62 is naturally engaged with the groove of the sheave 61 of the engagement means 60.

With the rotation, the tension due to the weight of the auxiliary hook 20 is applied to the wire rope 21, and the wire rope 21 is pulled toward the tip end of the jib body 40. Will be released. Then, as shown in FIG. 9, the jib main body 40 is raised while the boom 3 is lying down, and the boom 3 and the jib main body 40 are brought into a substantially horizontal state. At this time, the auxiliary hook 20 is automatically attached to the distal end of the jib body 40, and the wire rope 21 is engaged with the sheave 32 on the upper surface of the jib bracket 30 and the sheave 61 at the distal end of the jib. The wire rope 21 engaged with the sheave 61 can be easily replaced with the guide sheaves 41 and 42 at the jib tip. As a result, the heavy auxiliary hook 20 and the wire rope 2
It is no longer necessary for the operator to move a long distance with the handle 1, and it is possible to eliminate the dirt on the wire rope 21 due to the change work. Furthermore, the work of changing the wire rope is not required.

When the jib is stored, the above procedure may be reversed. Here, in the procedure described above, each operation is performed in reverse (for example, pulling out the pin insertion, releasing the wire rope lock, turning in the reverse direction, turning down,
etc). As a result, similarly to the case where the jib is extended, the movement with the heavy auxiliary hook 20 and the wire rope 21 can be eliminated, and labor for replacing the wire rope can be saved.

[0055]

According to the present invention, when the jib body is lowered along the longitudinal axis of the boom with respect to the jib bracket by the engagement means 60 of the wire rope provided at the distal end of the jib body, the jib body hangs down from the base end of the jib. The wire rope can be locked. This automatically locks the wire rope to the jib tip. Thereafter, when the jib main body is turned 180 degrees and extended to the front of the boom, the wire rope locked by the engaging means 60 is naturally engaged with the groove of the sheave of the engaging means 60. Accordingly, the auxiliary hook is naturally attached to the jib tip. The wire rope engaged with the sheave of the engaging means 60 is replaced with a guide sheave at the tip end of the jib main body after the jib main body and the boom are finally brought into a substantially horizontal state. Therefore, it is not necessary for the operator to move a long distance with the heavy auxiliary hook and the wire rope, and the fatigue of the operator can be reduced. Further, since the wire rope can be prevented from being contaminated, irregular winding of the wire rope is reduced, and as a result, the life of the wire rope can be improved.

Also, before the jib is extended, the guide sheave at the distal end of the tip boom is guided to and locked by the locking means 70 via the roller and the guide sheave on the upper surface of the base end of the jib before the jib is extended. When the wire rope turns 180 degrees after protruding the jib body and projects forward of the boom, and when the boom and the jib are both in a substantially horizontal state, the wire rope is connected to the guide sheave on the upper surface of the base end of the jib. You can keep it inserted. With this rotation, the wire rope is naturally released from the locking means 70. As a result, there is no need to change the wire rope at the jib base end, and the workability at the time of extending the jib is improved.

[Brief description of the drawings]

FIG. 1 is a side view of a wire rope changing device when a jib is extended and retracted according to an embodiment of the present invention.

FIG. 2 is a perspective view of an engagement means 60 according to the embodiment of the present invention.

FIG. 3 is a plan view illustrating a locking unit 70 according to the embodiment of the present invention.

FIG. 4 is a side view illustrating the locking means 70 according to the embodiment of the present invention.

FIG. 5 is a flowchart illustrating a procedure of a wire rope replacement method at the time of jib extension and storage according to the embodiment of the present invention.

FIG. 6 is a diagram illustrating a procedure of a wire rope replacement method at the time of jib extension and storage according to the embodiment of the present invention.

FIG. 7 is a diagram illustrating a procedure of a wire rope replacement method at the time of jib extension and storage according to the embodiment of the present invention.

FIG. 8 is a diagram illustrating a procedure of a wire rope replacement method at the time of jib extension and storage according to the embodiment of the present invention.

FIG. 9 is a diagram illustrating a procedure of a wire rope replacement method at the time of jib extension and storage according to the embodiment of the present invention.

FIG. 10 is a diagram illustrating a conventional wire rope changing device.

FIG. 11 is a diagram illustrating a conventional wire rope changing device.

FIG. 12 is a diagram illustrating a conventional wire rope changing device.

FIG. 13 is a plan view of a jib connecting portion of the conventional wire rope changing device.

FIG. 14 is a flowchart illustrating a procedure of a conventional wire rope replacement method.

FIG. 15 is a diagram illustrating a conventional wire rope replacement method.

FIG. 16 is a diagram illustrating a conventional wire rope replacement method.

FIG. 17 is a diagram illustrating a conventional wire rope replacement method.

FIG. 18 is a view for explaining a conventional wire rope replacement method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Lower traveling body, 2 ... Outrigger, 3 ... Boom, 4 ...
Base boom, 5 middle boom, 6 tip boom, 7 jib, 8 upper swing body, 10 main hook, 11 wire rope (for main hook), 20 auxiliary hook, 21 wire rope (auxiliary) Hook), 22 ... Guide sheave, 23 ...
Tip sheave, 25 ... bracket, 26 ... pivot pin, 27
a, 27b: bracket, 28a, 28b: bracket, 30: jib bracket, 31: pivot pin, 32: guide sheave, 33a, 33b: bracket, 34a, 3
4b: bracket, 35a, 35b: connecting pin, 36
a, 36b: connecting pin, 37: bracket, 38: pivot pin, 39: pivot pin, 40: jib body, 41: guide sheave, 42: guide sheave, 45: bracket, 45
a, 45b ... holes, 46 ... brackets, 46a, 46b ...
Locking pins, 47a, 47b: bracket, 48: fixing pin, 50: jib undulating cylinder, 51: pivot pin, 52:
Axis pin, 55: rotating cylinder, 56: bracket, 5
7 link member, 58 link member, 59 pivot pin,
60 engaging means, 61 sheave, 62 first guide,
63: second guide, 63a, 63b: inclined portion of second guide, 70: locking means, 71: guide roller, 71
b, 71c: roller, 71a: bracket, 72: guide roller, 72b, 72c: roller, 72a: bracket.

Claims (4)

(57) [Claims] A jib (7) housed on the side of a boom (3) of a mobile crane is extended to connect the boom (3) and the jib (7) at a tip end of the boom (3), and for an auxiliary hook. The wire law
Multiplied flop (21) from the tip of the boom (3) to the tip of the jib (7)
The jib (7) is turned in the vertical plane along the longitudinal axis of the boom (3) from the side position of the boom (3) to the lower vertical position in the wire rope changing device when the jib is extended and retracted. When moving , hang down on the side opposite to the boom (3) when the jib is retracted
Engaged the wire rope (21) for the auxiliary hook, the engagement
The engagement means (60) for rotating the wire rope (21) together with the jib (7) is moved to the boom (3) when the jib is retracted at the end of the jib (7 ).
A jib overhanging and retracting wire rope at the time of stowage, which is arranged on the opposite side . 2. The jib retracted before the jib (7) is rotated about the rotation axis (35a, 35b) in the vertical plane with respect to the boom (3).
Locking the over arm (3) and wire rope for hanging down the auxiliary hooks on the opposite side (21), and said pivot shaft (35a, 35 of the jib (7)
b) Locking means (70) for releasing this lock with rotation around
2. The wire rope changing device according to claim 1, wherein the jib is disposed at a base end of the jib (7). 3. A jib (7) housed on the side of a boom (3) of a mobile crane, which is extended to connect the boom (3) and the jib (7) at a tip end of the boom (3), for an auxiliary hook. The wire law
Multiplied flop (21) from the tip of the boom (3) to the tip of the jib (7)
The jib (7) has a boom (3) around a rotation axis (35a, 35b) in a vertical plane.
Opposite to the boom (3) when the jib is retracted before pivoting
Locking means for locking a wire rope (21) for an auxiliary hook hanging down to the side , and releasing the locking with rotation of the jib (7 ) around the rotation shafts (35a, 35b). A wire rope changing device at the time of jib overhang and storage, wherein (70) is disposed at the base end of the jib (7). 4. A method for extending a jib in which a jib is stored on a side surface of a boom of a movable crane and an auxiliary hook is attached to the jib and for changing a wire rope when storing the jib. When pulling out, a) lay the boom down substantially parallel to the ground, ground the auxiliary hook to the ground, loosen the wire rope, b) lock this wire rope with the wire locking means of the jib, c ) Raise the boom to a predetermined angle and extend it to release the locking pin that locks the jib to the side of the boom.d) Lower the jib to the predetermined angle and attach the wire rope to the engagement means at the jib tip. E) rotate the jib 180 degrees forward from the side of the boom, f) lay the boom down substantially parallel to the ground, raise the jib, and g) attach the wire rope to the guide sheave at the end of the jib. Engage
Conducted according to the procedure, also when storing jib on the side surface of the boom, jib overhang and stored during the wire rope hanging recombinant method characterized by performing recombinant hanging wire rope Conversely procedure.