JPH069191A - Operating method of jib added to telescopic boom - Google Patents

Abstract

PURPOSE:To carry out the adding and storing of a jib easily in a small space by rotating a jib installing frame body between the reversing position and the front side position, after rotating a jib main body to the lower side bending position forcibly by a hydraulic cylinder so as to fix it. CONSTITUTION:When a jib 2 in a storing condition is added to the tip of a telescopic boom 1, the telescopic boom 1 is contracted at first, and a rotation connecting device 3 is connected. Then, after the connection of the jib 2 to the side surface of the telescopic boom 1 is released, a hydraulic cylinder 9 is expanded while the telescopic boom 1 is raised, and a jib main body 7 is rotated to the lower bending position where the axial line in the horizontal direction is made almost parallel to the rotary shaft core 3C of the rotation regulating device 3. After that, a wire rope 31 is wound by a winch, and a jib installing frame body 4 is rotated to the front side position at the tip of the telescopic boom 1 making the rotation connecting device 3 as the center. Then, the hydraulic cylinder 9 is moved to contract, the jib main body 7 is rotated around a horizontal supporting shaft 6, and after that, the frame body 4 is connected to the telescopic boom 1 with a fixing device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a jib which is added to a telescopic boom.

[0002]

2. Description of the Related Art Telescopic booms used in cranes such as hydraulic truck cranes and rough terrain cranes are connected to the tip of the telescopic boom when they are used, and when they are not in use, they are stored in one side of the telescopic boom in an inverted folding shape. The jib is attached.

[0003] This type of jib requires a smaller amount of work for replenishing work from the retracted position on one side of the telescopic boom to the end of the telescopic boom and for retracting work on the one side of the telescopic boom from the extended position added to the end of the telescopic boom. Various attempts have heretofore been made to carry out the work in a space. As one of them, the present applicant previously invented a jib as shown in Japanese Patent Laid-Open No. 59-74894.

This is as shown in FIGS. 6 and 7.
One end of the base of the telescopic boom 1 is attached to one side of the jib 2 so that the jib 2 can be rotated laterally between a front position of the front end of the telescopic boom 1 and a reversal position rotated by about 180 ° from the front position. A frame 4 for jib attachment which is detachably attached to the side through a rotary coupling device 3, and is connected to the rotary coupling device 3 between the other side of the base part thereof and the other side of the distal end of the telescopic boom. Then, the jib mounting frame body 4 provided with a releasable fixing device 5 for fixing the jib mounting frame body 4 to the front position, and the base end portion thereof are located below the jib mounting frame body 4. The jib body 7 is attached to the front end through the horizontal support shaft 6 so as to be vertically rotatable, and the jib body 7 is vertically rotated between the proper place on the upper side and the proper place of the jib attachment frame 4. Consisting of a jib body 7 with a releasable coupling device 8 fixed in the extended position) During extension and storage of the jib 2, the telescopic boom 1 is raised, and then the jib body 7 is freely suspended from the jib mounting frame 4 via the horizontal support shaft 6, and then the jib mounting frame. The body 4 is rotated about the rotation coupling device 3 from the reversal position to the front position or from the front position to the reversal position, and then the jib body 7 is moved to the extension position with respect to the jib mounting frame body 4. It is known that it is fixed.

[0005]

However, in this known example, when the telescopic boom 1 is raised when the jib 2 is extended and stored, the jib mounting frame 4 is moved toward the tip end side of the telescopic boom 1. Since the rotation shaft center 3C of the rotation connecting device 3 which is rotatably connected in the lateral direction is inclined from the vertical direction, the jib mounting frame 4 is centered on the rotation connecting device 3 when the jib 2 is projected and stored. When the jib body 7 is rotated from the inverted position to the front position, the tip of the jib body 7 is in a freely suspended state (the position indicated by the chain double-dashed line in FIG. 6) on the jib mounting frame 4 via the horizontal support shaft 6. There is a problem that the part swings greatly back and forth.

The reason is that the jib mounting frame 4 and the jib body 7
The horizontal support shaft 6 that rotatably and vertically maintains the horizontal level when the jib attachment frame body 4 is in the inverted position and the front position, but the jib attachment frame body 4 is centered around the rotation coupling device 3. In the state in which the horizontal support shaft 6 is rotated approximately 90 ° from the inverted position or the front position, the horizontal support shaft 6 is in a state of being substantially along the longitudinal direction of the telescopic boom 1 in the upright state. The tip of the jib body 7 rotatably attached moves largely forward. (Position B shown by a chain double-dashed line in FIG. 6). When the jib mounting frame 4 is rotated from this state to the front position or the reversal position about the rotation coupling device 3, the horizontal support shaft 6 becomes horizontal and the jib which is freely suspended on the horizontal support shaft 6. The main body 7 swings backward. Therefore, the jib body 7 swings greatly in the front-back direction.

Further, the jib mounting frame 4 is attached to the rotary connecting device 3
In order to bring the jib main body 7 into a state in which it is rotated by 90 ° from the inverted position or the front position, the state in which the jib body 7 is tilted forward from the vertically suspended state (the position indicated by the chain double-dashed line in FIG. 6)
As a result, the center of gravity of the jib body 7 is substantially lifted with this inclination, and there is a problem that a large force is required.

As described above, according to Japanese Patent Laid-Open No. 59-74894, not only is the rocking of the jib body 7 in the front-rear direction extremely dangerous when the jib 2 is extended or stored, but also this rocking. Needed a large space to allow. In addition, the operation required great power. The present invention has been made for the purpose of proposing a novel method for operating a jib added to a telescopic boom, which eliminates the above-mentioned drawbacks of the jib added to the telescopic boom of the related art.

[0009]

In order to achieve the above object, a method of operating a jib to be added to a telescopic boom according to the present invention is as follows. The jib 2 which can be folded along the jib 2, and in particular, the front position of the front end portion of the telescopic boom 1 and the telescopic boom 1 from this front position.
For attaching a jib, one side of its base is detachably attached to one side of the distal end of the telescopic boom 1 through a pivotal coupling device 3 so that it can be pivoted between 180 degrees to the side. The jib attachment frame body 4 is fixed to the front position of the telescopic boom 1 in cooperation with the rotary connecting device 3 between the other side of the base portion of the frame body 4 and the other side of the distal end portion of the telescopic boom. A frame 4 for attaching a jib having a releasable fixing device 5, and a base end portion thereof attached to the frame 4 for attaching a jib so as to be vertically rotatable via a horizontal support shaft 6 And a hydraulic cylinder 9 which is interposed between the jib main body 7 and the jib mounting frame 4 and which drives the jib main body 7 to rotate about the horizontal shaft 6. A method of operating a jib, wherein the jib body 7 is moved by the hydraulic cylinder 9.
Is a downward position where the extension position of the jib attachment frame 4 is extended and the longitudinal direction of the jib body 7 is substantially parallel to the rotation axis 3C of the rotation connection device 3 of the jib attachment frame 4. The jib 2 is configured so that it can be forcedly rotated between itself and the bending position.
In changing the posture from the folding position to the extending position or from the extending position to the folding position, first, the jib body 7 is pivotally fixed to the jib mounting frame body 4 by the hydraulic cylinder 9 in the downward bending position, and then, The jib mounting frame 4 is rotated to the front position or the reversal position by an appropriate means about the rotation axis 3C of the rotation coupling device 3, and finally the hydraulic cylinder 9 is used. It is characterized in that the jib body 7 is rotated to the extended position with respect to the jib mounting frame 4.

[0010]

According to the method of operating the jib added to the telescopic boom of the present invention, when the jib is extended and stored, the frame for attaching the jib can be pivoted to the tip of the telescopic boom via the pivotal coupling device. Raise the telescopic boom in the connected state, bend the jib body downward from the jib mounting frame via the horizontal support shaft, and then move the jib mounting frame from the inverted position to the front from the turning connecting device. Or to rotate from the front position to the inversion position, and then the jib body is fixed to the extended position with respect to the jib mounting frame body, which is the same as the conventional one.

However, the operation method of the jib added to the telescopic boom of the present invention is such that the jib body is interposed between the jib body and the jib mounting frame body and the jib body is extended to the front surface of the jib mounting frame body. Forced rotation of the jib body about the horizontal support shaft between a position and a downward bending position where the longitudinal direction of the jib body is substantially parallel to the rotation axis of the rotation connecting device of the jib mounting frame. By the hydraulic cylinder, the jib mounting frame and the jib body are rotated and fixed in the downward bending position where the longitudinal direction of the jib body is substantially parallel to the rotation axis of the rotation coupling device of the jib mounting frame. After that, the jib mounting frame is rotated about the pivotal coupling device from the reversal position to the front position or from the front position to the reversal position. It does not move and the tip of the jib body is small. In can be rotated, but they can safely overhang storage jib in a small space. Further, when the jib attachment frame is rotated about the rotation connecting device, the inclination of the jib body hardly changes, so that the force required for the rotation can be small.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for operating a jib added to a telescopic boom according to the present invention will be described below with reference to FIGS. In FIGS. 1 and 5, reference numeral 1 denotes a telescopic boom mounted on a swivel base (not shown) mounted on a traveling vehicle so as to be capable of swinging up and down. Reference numeral 2 is a jib, and the jib 2 is composed of a jib mounting frame 4, a jib body 7, and a hydraulic cylinder 9. Frame 4 for mounting the jib
Between the front position (the position shown in FIG. 3) of the front end of the telescopic boom 1 and the reverse position (the position shown in FIGS. 1, 2 and 4) rotated 180 ° from the front position. One side of the base portion of the telescopic boom 1 is detachably attached to the one end portion of the telescopic boom 1 via the pivotal coupling device 3 so as to be pivotable in the lateral direction, and the telescopic boom is attached to the other side of the base portion. 1
A releasable solid-state device 5 for fixing the jib attachment frame 4 to the front position is provided between the tip end portion and the other side of the pivot joint device 3.

As can be understood from FIG. 5, the pivotal connecting device 3 includes brackets 10 and 11 projecting vertically from one side of the base of the jib mounting frame 4 and the tip of the telescopic boom 1. Side brackets 12 and 1 projecting from the upper and lower positions, respectively
3 and pins 14 and 15 for connecting the bracket 10 and the bracket 12 and the bracket 11 and the bracket 13 are provided. In a state where the brackets are connected by the pins 14 and 15, the rotation determined by the pins 14 and 15 is provided. Jib mounting frame 4 centered on the axis 3C
Becomes rotatable between the front position and the inverted position, and when the pins 14 and 15 are removed to disconnect the brackets from each other, the rotary connecting device 3 is released and the jib mounting frame 4 is released. It can be detached from the tip of the telescopic boom 1.

In this embodiment, as will be described later, on the bracket 10 of the jib mounting frame 4, a horizontal sheave support shaft having an axis centered with the rotation axis 3C of the rotation coupling device 3. Due to the protruding configuration of the pin 16, the pin 14 is inserted from below and the pin 15 is inserted from above to connect the respective brackets.

The fixing device 5 includes brackets 17 and 1 which are provided at the upper and lower positions on the other side of the base of the jib mounting frame 4, respectively.
8, brackets 19 and 20 projectingly provided at upper and lower positions on the other end of the telescopic boom 1, and pins 21 and 22 for connecting the bracket 17 and the bracket 19 and the bracket 18 and the bracket 20, respectively.

The jib body 7 has its base end portion attached to the lower front end of the jib attachment frame 4 so as to be vertically rotatable via a horizontal support shaft 6. The hydraulic cylinder 9 is interposed between the jib body 7 and the jib mounting frame body 4, and the jib body 7 extends to the front surface of the jib mounting frame body 4 in the extended position (see FIGS. 1 and 3). And the downward bending position in which the jib body is substantially parallel to the rotation axis 3C of the rotation coupling device 3 of the jib attachment frame 4 (shown in FIGS. 2 and 2). Between the positions (1) and (2), the jib body 7 is driven to rotate around the horizontal support shaft 6. In the case of the present embodiment, the hydraulic cylinder 9 is interposed between the upper left and right positions of the jib mounting frame 4 and the base end upper left and right positions of the jib body 7, respectively.

Reference numeral 23 denotes the bracket 1 of the jib mounting frame body 4.
It is a horizontal sheave that is rotatably attached to the upper end of the horizontal sheave support shaft 16 that is provided so as to project above 0. A wire 24 has a base end fixed to a boss 25 pivotally supported by a horizontal sheave support shaft 16 below the horizontal sheave 23, and a tip end thereof closely opposed to a wire rope groove of the horizontal sheave 23. It is a rope stopper (see Fig. 5).

Reference numeral 26 denotes a guide sheave provided at a proper position on the upper side of the telescopic boom 1, and 27 denotes a guide sheave rotatably supported by a bracket 28 projecting above the jib mounting frame body 4. Reference numeral 29 is a guide sheave provided above the base end of the jib body 7. 30 is a jib tip pulley. Reference numeral 31 is a wire rope drawn out from a jib winch (not shown) provided on the swivel base, and is hung around the guide sheave 26, the horizontal sheave 23, the guide sheave 27, the guide sheave 29, and the jib tip pulley 30 in this order. Then, the tip thereof is connected to the jib hook block 32. A seat 33 is provided at the tip of the jib body 7 and the jib hook block 32 is wound up and is in contact with the jib hook block 32.

Reference numeral 34 denotes a wire rope (not shown in the figure) drawn from a main winch (not shown) provided on the swivel base to the upper end of the telescopic boom 1 and the pulley 30 at the tip of the telescopic boom 1 to the tip of the telescopic boom 1. ) Is a main hook block suspended from the telescopic boom 1 at the tip thereof.

The jib mounting frame 4 is rotated and folded back with respect to the telescopic boom 1 which is in a contracted state around the rotary coupling device 3, and the jib body 7 is set in the extended position with respect to the jib mounting frame 4. In the opened state (states of FIG. 1 and FIG. 4), the base end portion one side proper position of the jib body 7 and the outer boom 1a one side proper place of the telescopic boom 1 facing the one side proper place, and the jib body 7 tip portion. Releasable coupling devices 35 and 36 for coupling and holding the jib body 7 to the outer boom 1a are provided between the proper position on one side and the proper position on one side of the outer boom 1a of the telescopic boom 1 opposed thereto. (See FIG. 4).

The pressure oil for driving the hydraulic cylinders 9, 9 is a hose reel 37 provided at a proper position on one side of the outer boom 1a of the telescopic boom 1 and a two-piece hose 38 wound on the hose reel 37. Via an operation valve of a driver's seat (not shown) of the swivel base to the hydraulic cylinders 9 and 9 so that the hydraulic cylinders 9 and 9 can be expanded and contracted by operating the operation valve. It has become.

Next, the operation of this embodiment will be described. In the retracted state of the jib 2, the jib attachment frame 4 is in the inverted position and the jib body 7 is in the extended position (the state of FIGS. 1 and 4), and the coupling devices 35 and 36 are connected. Connect and disconnect the pivotal connection device 3, thereby providing the jib 2
Is connected to one side surface of the outer boom 1a of the telescopic boom 1 in an inverted state, and in this state, the telescopic boom 1 can be extended and retracted and raised and lowered to perform a crane operation by the main hook 34.

When the jib 2 is added to the tip of the telescopic boom 1 from the stored state of the jib 2, (1) the telescopic boom 1 is contracted and the rotary connecting device 3 is connected. (2) Release the connecting devices 35 and 36. This release is
The structure in which the coupling devices 35 and 36 are formed by relative movement of the jib 2 in the extension direction of the telescopic boom 1 with respect to the outer boom 1 is achieved by slightly extending the telescopic boom 1. In the state where the coupling devices 35 and 36 are released, the jib 2 is coupled to the tip end portion of the telescopic boom 1 only by the pivotal coupling device 3, and the horizontal support shaft 6 of the jib body 7 with respect to the jib mounting frame 4 is connected. The rotation around is restricted by the hydraulic cylinder 9.

(3) Next, the telescopic boom 1 is raised at an appropriate angle. This elevation angle allows the jib body 7 to move to the horizontal support shaft 6
The elevation angle is such that the tip of the jib 2 does not interfere with the ground surface when it is rotated downward around the center. (4) The hydraulic cylinder 9 is extended to drive the jib body 7
The longitudinal axis of which is the rotational axis 3C of the rotational coupling device 3.
It is rotated to a downward bending position which is substantially parallel to. In this state, it is fixed by the hydraulic cylinder 9. (State of FIG. 2)

(5) Next, the wire rope 31 is wound up by a jib winch, and the jib hook block 3
2 is seated on the seat 33 at the tip of the jib 2, and the wire rope 31 is further wound. At this time, the horizontal sheave 23
The tension of the wire rope 31 hung around in a U shape causes the jib attachment frame 4 to rotate around the rotation connecting device 3 to the front position of the tip portion 1 of the telescopic boom 1. In this pivoting movement, the longitudinal axis of the jib body 7 is pivotally connected 3
Since it is maintained substantially parallel to the rotation axis 3C, the rotation can be performed with a relatively small turning force, and the tip of the jib 2 (the tip of the jib body 7) makes a small rotation trajectory during the rotation. To do.

(6) The jib mounting frame 4 is the telescopic boom 1
After rotating to the front position of the tip of the hydraulic cylinder 9, the hydraulic cylinder 9 is driven to contract, and the jib body 7 is moved from the downward bending position with respect to the jib mounting frame 4 to the extending position (position in FIG. 3) to the horizontal support shaft 6 Rotate around.

(7) Next, the telescopic boom 1 is laid down, and the fixing device 5 connects the other side of the tip portion of the telescopic boom 1 of the jib mounting frame 4 to each other. In this way, the jib 2 is added to the tip of the telescopic boom 1 from the retracted position. Then, the telescopic boom 1 is undulated, telescopically and swiveled,
The jib hook block 32 hung at the tip of the jib 2 is used for crane work. At this time, the tilt angle of the jib body 7 can be adjusted by driving the hydraulic cylinder 9 to extend and contract from below (the driver's seat of the swivel), so that various crane operations can be accommodated. Of course, between the jib main body 7 and the jib mounting frame 4, a releasable connecting means for locking the jib main body 7 at arbitrary plural tilt positions is provided, and by locking this connecting means, crane work can be performed. The hydraulic cylinder 9 may be made to have a small output by causing the connecting means to carry the force that sometimes acts on the hydraulic cylinder 9. When the jib 2 is replenished from the additional position (the position shown in FIG. 3) to the retracted position, the above (1)-
The operation procedure of (7) may be reversed. In this case, even if the operation procedure (5) is reversed, the jib attachment frame body 4 does not rotate from the front surface position of the tip end portion of the telescopic boom 1 to the inversion position. , As follows.

(5 ') After slightly loosening the wire rope 31, the telescopic boom 1 is slightly buffered to make a swing motion (which can be achieved by swinging the swivel base), and the jib mounting frame 4 is rotated by this impact. The movable coupling device 3 is rotated in the direction of the reversal position, or the telescopic boom 1 is swung after the tip of the jib body 7 is attached to the ground, and the swivel mechanism 4 is used to swivel the jib mounting frame 4. Or turn the jib mounting frame 4 by rotating it in the direction of the reversing position or by a worker located on the ground putting an iron rod on the tip of the jib body 7 and twisting the jib body 7. The dynamic coupling device 3 is rotated in the direction of the reversal position. After a predetermined amount of rotation is achieved in this way, the turning force in the reversing position direction is generated by the weight of the jib 2, so that the wire rope 31 is gradually loosened to bring the jib mounting frame 4 to the reversing position. is there.

In the above embodiment, the wire rope 31 is hung around the tip of the jib 2 via the horizontal sheave 23, and the tension of the wire rope is turned to rotate the jib mounting frame 4 from the reverse position to the front position. Although it is used as a power source, this is not a requirement of the present invention. The jib attachment frame 4 is rotated from the inverted position to the front position or from the front position to the inverted position when the jib body 7 is rotated downward relative to the jib attachment frame 4 (the longitudinal direction of the jib body 7). Since the axis is at a position substantially parallel to the rotation center of the rotation coupling device 3, the rotation can be performed with a relatively small force, so that the worker can move the jib body 7 from the ground with a steel bar or the like. It can also be easily twisted.

[0030]

In any case, the operation method of the jib added to the telescopic boom of the present invention is such that the jib body is moved by the hydraulic cylinder interposed between the jib body and the jib mounting frame.
After forcibly rotating and fixing the jib mounting frame body in the downward bending position whose longitudinal direction is substantially parallel to the rotation axis of the rotation coupling device of the jib mounting frame body, center the jib mounting frame body around the rotation coupling device. Since it is designed to rotate from the reverse position to the front position or from the front position to the reverse position, the tip part of the jib body does not swing in the front-back direction, and the tip part of the jib body is within a small range. It can be swiveled, and the jib can be safely extended and stored in a small space. Further, when the jib mounting frame is rotated about the rotation connecting device, the inclination of the jib body hardly changes, so that the force required for the rotation can be small.

[Brief description of drawings]

FIG. 1 is an explanatory view for explaining a method of operating a jib added to a telescopic boom according to the present invention, and is a side view of a stored state of the jib.

FIG. 2 is an explanatory view for explaining a method of operating a jib added to the telescopic boom according to the present invention, and is a side view showing a state in which the jib is being added.

FIG. 3 is an explanatory view for explaining a method of operating a jib that is added to the telescopic boom according to the present invention, and is a side view showing a state in which the end of the telescopic boom is added.

4 is an explanatory view for explaining a method of operating the jib added to the telescopic boom according to the present invention, and is a plan view of FIG. 1. FIG.

5 is an explanatory view for explaining a method of operating the jib added to the telescopic boom according to the present invention, which is a left side view of FIG. 1. FIG.

FIG. 6 is an explanatory view showing a conventional example, which is a side view of a stored state of a jib.

FIG. 7 is an explanatory view showing a conventional example and is a plan view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telescopic boom 2 Jib 3 Rotating connecting device 4 Jib mounting frame 5 Fixing device 6 Horizontal support shaft 7 Jib body 3C Rotating shaft center of rotating connecting device 3 9 Hydraulic cylinder

Claims (1)

[Claims] 1. A jib 2 capable of taking a splicing position that is added to the front surface of the telescopic boom 1 and a folding position that is folded along the side surface of the telescopic boom 1, particularly a front surface of the front surface of the telescopic boom 1 front end. Position and one side of the base of the telescopic boom 1 to the one end of the telescopic boom 1 so that the telescopic boom 1 can be pivoted to the side of the telescopic boom 1 by about 180 ° from the front position. A frame 4 for jib attachment that is detachably attached by means of the jib attachment frame 4 between the other side of the base part thereof and the other side of the distal end of the telescopic boom in cooperation with the rotary coupling device 3. The jib mounting frame body 4 provided with a releasable fixing device 5 for fixing the to the front position of the telescopic boom 1, and the base end portion of the jib mounting frame body 4 in the vertical direction via the horizontal support shaft 6 on the jib mounting frame body 4. A jib body 7 of an appropriate length attached so as to be rotatable, And a method for operating a jib, which comprises a hydraulic cylinder 9 which is interposed between the jib body 7 and the jib mounting frame 4 and which drives the jib body 7 to rotate about the horizontal shaft 6. The hydraulic cylinder 9 causes the jib body 7 to extend to the front surface of the jib mounting frame 4 and the rotational connecting device 3 of the jib mounting frame 4 in the longitudinal direction of the jib body 7.
It is configured such that it can be forcibly rotated between a downward bending position which is substantially parallel to the rotation axis 3C of the above, and when the attitude of the jib 2 is changed from the folding position to the extending position or from the extending position to the folding position. First, the jib body 7 is pivotally fixed to the jib mounting frame body 4 in the downward bending position by the hydraulic cylinder 9, and then the jib mounting frame body 4 is pivoted about the pivot axis 3C of the pivotal coupling device 3. The jib mounting frame body 4 is rotated to the front position or the reversing position by an appropriate means around the center, and finally the hydraulic cylinder 9 rotates the jib body 7 to the extension position with respect to the jib mounting frame body 4. A method of operating a jib that is added to a telescopic boom, which is characterized in that