JP3917236B2 - Roughing jib crane - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
The present invention relates to a crane with a luffing jib, and more particularly to a luffing jib raising mechanism when the luffing jib is assembled to a boom tip portion by a vertical assembly method.
[0002]
[Prior art]
As is well known, there is a luffing jib as a crane used for unloading or unloading work at a high head or at a remote position.
For example, a luffing jib has a base jib attached to the tip of a boom mounted on a truck crane, and a plurality of divided jibs and a sheave for suspending a hook block to the tip of the divided jib according to the working conditions. It is configured by connecting the attached top jibs.
Multiple jibs are connected to form an intermediate jib section between the base jib and the top jib. Lattice jibs that can be reduced in weight compared to the number of connecting stages in such an intermediate jib section are often used. In addition, the longitudinal ends of the lattice jibs are connected.
As a configuration for connection, a lug-like portion facing each other is formed on one of the longitudinal ends of the lattice jib, and a piece formed on the other side in the longitudinal direction is inserted into the lug-like portion. There is a configuration in which a pin is inserted into an insertion hole formed in each of the shape part and the piece part (for example, JP-A-7-69585).
[0003]
By the way, when assembling a luffing jib, the present applicant has proposed an assembly method called a vertical assembly method that can reduce the ground space required for assembly (for example, a patent related to a prior application of this application). No. 2524141).
This assembly method is a method in which the split jib is sequentially suspended from the boom tip while the telescopic boom is extended.
When assembling the luffing jib by the standing assembly method, first and second masts for supporting the luffing jib at an arbitrary undulation angle and a third mast for raising the luffing jib together with each mast are provided.
FIG. 4 shows an example of a luffing jib equipped with the first to third masts. In FIG. 4, a roughing jib 1 is composed of a base jib section 2, an intermediate jib section 3, and a top jib section 4. The jib section 2 is constituted by a divided jib pivotally supported on a luffing jib attachment base 7 attached to the tip of a boom 6 equipped on the truck crane 5.
The intermediate jib section 3 is configured by connecting divided jibs of the number of stages according to the work contents, and the top jib section 4 is attached with a tension rod 8 for raising and lowering the luffing jib and a sheave for winding the sub rope. It has been.
[0004]
On the other hand, the first and second masts 9 and 10 are swingable members whose base ends are pivotally supported by the base jib section 2, and the third mast 11 is close to the front end of the luffing jib mounting base 7. It is fixed in a state of being directed upward at the position of. The first and second masts 9, 10 can be interlocked by a bendable tension rod 13 that is connected to the tips thereof.
A roller is provided at the tip of the third mast 11 so that the tension rope 12 and the sub rope 14 that are hooked on the tip of the second mast 10 can be hung around.
The state shown in FIG. 4 corresponds to the time when the connection of the jib sections 2, 3, 4 by the standing system is finished, and in this state, the winch mounted on the swivel is operated to perform the luffing jib. Is raised. That is, by pulling the tension rope 12 hung around the third mast 11 by the winch winding operation, the second mast 10 is caused, and the first mast 9 is interlocked via the tensioning action of the tension rod 14 so that the first and Rafting jib 1 is raised by raising second masts 9 and 10.
[0005]
[Problems to be solved by the invention]
By the way, in order to raise the undulation angle and stand up, when raising the luffing jib by the third mast 11, the middle of the tension rope 12 is lifted up and the second mast 10 is suspended. It is necessary to secure a moment that can be performed. Therefore, conventionally, the luffing jib attachment base is lengthened and the position of the swinging fulcrum shaft of the duffing jib is often arranged above the boom center line.
This leads to an increase in the size of the structure at that portion, which increases the moment that the boom bears. For this reason, there exists a possibility that the work performance in the case of turning of a boom and raising / lowering operation | movement may fall.
In addition, since the third mast 11 is fixed to the luffing jib mounting base 7 and is erected, when the swing angle of the second mast 10 is large, the third mast 11 easily interferes with the second mast 10 and is transported. It gets in the way when not in use.
On the other hand, when the third mast 11 is fixed and standing, the contents of the assembly work may be hindered. In other words, in the assembly work, there is a work of guiding the sub rope to the tip of the base jib section 2 before raising, and this work is carried out on the telescopic boom 6 by the operator holding the tip of the sub rope in the hand, and the base for attaching the luffing jib. 7 and the second mast 10 are sequentially walked to reach the base jib section. At that time, it is necessary to walk while avoiding the third mast 11, and smooth walking for work is hindered.
In view of this, a configuration in which the third mast is provided so as to be tiltable has been proposed (for example, Japanese Patent Application Laid-Open No. 7-215672 relating to the prior application of this application). However, in the case of such a configuration, a dedicated hydraulic cylinder for performing the raising / lowering operation is required, resulting in an increase in weight and a complicated structure.
[0006]
In view of the above problems with the conventional crane with a luffing jib, the object of the present invention is to prevent the third mast used when raising the luffing jib from getting in the way when not in use, and improve the workability of assembly and crane work. An object of the present invention is to provide a crane with a luffing jib having a configuration that can be made to operate.
[0007]
[Means for Solving the Problems]
In order to achieve this object, according to the first aspect of the present invention, the base jib section and the intermediate jib section or the top jib section are connected by sequentially connecting the divided jibs while extending the telescopic boom while being suspended from the tip of the boom. The third mast that pulls up the first and second masts arranged in the front-rear direction of the telescopic boom in the vicinity of the base jib section in order to hold the luffing jib at an arbitrary angle. In the crane with a luffing jib provided with the first mast, the third mast includes first and second links, and the first and second links are pivotally supported with respect to each other and hang around a tension rope. the roller is equipped, the first link is extended from the base portion which is fixed to the base jib section Tips are having a swing fulcrum in the support base of the tip which is extended toward the connecting position side with the luffing jib mounting base and said telescopic boom, said second link is provided in the telescopic boom tip The luffing jib mounting base has a rocking fulcrum, and the rocking end can fall into the tip side of the base jib section when the base jib section and the luffing jib mounting base are in a substantially parallel state. When the base jib section is suspended from the luffing jib mounting base when the base jib section is erected , the base jib section has a swing fulcrum at the tip of the support base by the rotation of the support base integral with the base jib section. by standing in the first link is pulled, the roller causing the second link of the base jib section It is characterized in that is positioned in front of the rolling supporting point.
[0008]
According to a second aspect of the present invention, in the crane with a luffing jib according to the first aspect, the third mast is disposed inside the first and second masts in the width direction of the luffing jib.
[0009]
According to a third aspect of the present invention, in the crane with a luffing jib according to the first aspect, the third mast swings the first and second links when the luffing jib mounting base and the base jib section are connected. A fulcrum is attached.
[0010]
According to a fourth aspect of the present invention, in the crane with a luffing jib according to the first aspect, the first and second masts have a range corresponding to the rising locus of the third mast as a passage space for the third mast. It is characterized by being.
[0011]
A fifth aspect of the present invention is the crane with a luffing jib according to the first aspect, characterized in that a walking platform is provided on the back surface of the third mast.
[0012]
[Action]
In the first aspect of the invention, since the first link has the swing fulcrum on the luffing jib mounting base and the second link has the swing fulcrum on the base jib section, it depends on the operation form of the base jib section. Thus, it is possible to selectively set the state in which the third mast is collapsed and the state in which it is built. In particular, when the base jib section is not standing upright substantially parallel to the luffing jib mounting base, the protruding height is lowered by the third mast being brought down, and the base jib section is suspended from this state. At the time of assembly, it is in a state in which a tension rope can be hung around automatically based on the swing of the base jib section.
[0013]
In the second, fourth, and fifth aspects of the invention, the third mast is located inside the first and second masts, so that the first and second masts are raised when the third mast is in a collapsed state. When installed, the third mast does not interfere with the first and second masts. And since there is a walk stand in the back of the 3rd mast which does not interfere with the 1st and 2nd mast, it can walk on the 3rd mast.
[0014]
In the invention of claim 3, since the first to third masts are assembled at the same time, when assembling the luffing jib, it is only necessary to connect the first to third masts previously assembled. The work to assemble is no longer necessary.
[0015]
【Example】
The details of the present invention will be described below with reference to the illustrated embodiments.
FIG. 1 is a view showing a base jib section and a luffing jib mounting base used in a crane with a luffing jib. In FIG. 1, the luffing jib mounting base 20 is pin-coupled at four points, top, bottom, left, and right at the tip of a telescopic boom 21. ing. Since the configuration of the telescopic boom 21 and the luffing jib attachment base 20 is the same as that shown in FIG. 4, a detailed description thereof will be omitted.
The base end portion of the base jib section 22 is integrated with the luffing jib attachment base 20 by being supported by the roughing jib attachment base 20 in advance via the rotation support shaft 23 so that the base jib section 22 can be rotated up and down in a vertical plane. It has become.
Similar to this type of jib, the base jib section 22 includes a frame frame made of a lattice structure. In the longitudinal direction of the frame frame, the base jib section 22 is located above and below the end opposite to the supporting end of the luffing jib mounting base 20. Receiving portions 22A made of lug pieces are provided at the left and right corners, and fitted to end portions (not shown) made of a pair of lug pieces provided in the intermediate jib section or the top jib section. Pin-coupled.
[0016]
On the other hand, the base end side of the base jib section 22 is provided with a bracket 20A formed so as to protrude from the base jib section 22, as shown in FIG. First and second masts 24 and 25 for supporting at an angle are attached via a swing fulcrum shaft.
The first and second masts 24 and 25 have a structure in which two left and right struts and a reinforcing member disposed between the struts are connected to each other. The base end side on which the swing fulcrum shaft is located is a third that will be described later. A range corresponding to the rising locus of the mast 30 is a space, and is a passage space for the third mast.
[0017]
A back stopper device 26 is provided between the luffing jib mounting base 20 and the base jib section 22.
The back stopper device 26 is provided to prevent the luffing jib from inadvertently swinging backward in conjunction with the first and second masts 24 and 25 that are shaken when the luffing jib is raised. . For this reason, the back stopper device 26 has one end connected to the hydraulic cylinder 27 provided on the base jib section 24 side and the plunger of the hydraulic cylinder 27 and the other end pivoted to the roughing jib attachment base 20 side. A main link 28 and a sub-link 29 pivoted at each longitudinal end between the plunger and the base jib section 22 are provided.
When the split jib is connected by extending and raising the telescopic boom 21, the back stopper device 26 extends the plunger of the hydraulic cylinder 27 in a state where the connected jib section is suspended, and the jib section is The plunger of the hydraulic cylinder 27 contracts in accordance with the raised angle, and the base jib section 22 can be restrained from swinging further backward by fully contracting.
The main link 28 used in the back stopper device 26 functions as a stopper when the plunger of the hydraulic cylinder 27 contracts, and the sub link 29 has the hydraulic cylinder 27 and its plunger moved downward by an external force from above. It functions as a restricting member that prevents displacement. Further, the sub link 29 maintains a state in which a third mast 30 described later is collapsed, and comes into contact with a roller included in the third mast 30 to prevent rotation.
[0018]
The third mast 30 has the following configuration. In FIG. 1, the third mast 30 includes a first link 30 </ b> A and a second link 30 </ b> B on which the swing ends are pivotally supported and a roller 31 for hanging a tension rope is supported on the same axis. . The first link 30 </ b> A is supported by a support shaft 34 that serves as a swing fulcrum at the tip of a support base 33 whose base is fixed to the base jib section 22, and the second link 30 </ b> B is a support bracket that the luffing jib attachment base 20 has. In 20B, it is supported by the support shaft 32 which becomes a rocking fulcrum. As shown in FIG. 3, the support base 33 supporting the first and second links 30A and 30B of the third mast 30 and the support bracket 20B on the side of the luffing jib attachment base 20 are provided in the second mast in the width direction of the luffing jib. The interval in the width direction is set so as to be located inside the installation width range of 25, and when the first and second masts 24 and 25 are raised, the first and second masts 24 and 25 Interference is prevented.
[0019]
In FIG. 1, the support base 33 is extended from the base portion fixed to the base jib section 22 toward the connecting position side of the luffing jib attachment base 20 and the telescopic boom 21, and the second link It is located in the vicinity of the support shaft 32 that becomes the swing support point of 30B . For this reason, the position of the swing fulcrum ( support shafts 34, 32 ) of the first link 30A and the second link 30B is located on the same side behind the position of the rotation support shaft 23 of the base jib section 22. When the third mast 30 shown in FIG. 1 is stored, the first and second links 30A and 30B can be folded in a substantially horizontal state. The horizontal state of the first and second links 30A and 30B is determined by the position of the tip of the sub link 29 of the back stopper device 26 and the swing fulcrum ( support shafts 34 and 32 ) of the first and second links 30A and 30B. It is obtained by setting the support position to a height approximated in the vertical height direction.
[0020]
FIG. 3 is a local plan view showing the back surface of the third mast 30 and shows a state in which a part of the upper part is opened with the center line as a boundary in the vertical direction. In addition, the reinforcing material which comprises a lattice structure is omitted for convenience. In the figure, a pedestal 35 is provided on the back surface of a third mast 30 having a first link 30A and a second link 30B. Such a walking member is not shown, but there is a walking step provided on the back surface of the hydraulic cylinder 27 in the back stopper device 26.
[0021]
Since the present embodiment is configured as described above, when assembling the luffing jib in a standing manner, the luffing jib mounting base 20, the base jib section 22, the intermediate jib section, or the top jib section with respect to the telescopic boom 21 at the work site. Are sequentially connected and assembled, but prior to that, the luffing jib mounting base 20 is connected to the split jib forming the base jib section 22 before being transported to the work site. When the base jib section 22 is connected to the luffing jib attachment base 20, the first to third masts 24, 25, and 30 are attached to necessary support positions. That is, the first and second masts 24, 25 are attached to the bracket 20A on the base end side of the base jib section 22 via the swing fulcrum shaft, and the third mast 30 has the first link 30A connected to the base jib section. The second link 30B is supported by a support shaft 34 serving as a swing fulcrum at the tip of a support base 33 whose base is fixed to 22, and the second link 30B is a support shaft 32 serving as a swing support point in the support bracket 20B of the luffing jib mounting base 20. Supported by. At this time, the back stopper device 26 and the pedestal 35 located on the back of the third mast 30 are also supported at positions where members constituting the same are necessary. FIG. 1 shows a state in which the luffing jib mounting base 20, the base jib section 22 and related members are assembled and can be transported in this state. As shown in FIG. 1, the third mast 30 is in a state in which the luffing jib mounting base 20 and the base jib section 22 are substantially parallel (the swing angle of the base jib section 22 with respect to the swing fulcrum shaft 23 is almost 0 degrees. The first and second links 30A, 30B are centered on the position of the oscillating fulcrum ( support shafts 34, 32 ), and the oscillating end is on the tip side of the base jib section 22. This state is maintained by the hydraulic cylinder 27 of the back stopper device 26 and the sub-link 29 that supports it. As a result, the third mast 30 is substantially parallel to the base jib section 22 at the upper part of the base jib section 22, so that the third mast 30 does not protrude upward, and the occupancy in the height direction is reduced. This is advantageous in terms of limiting the height during transportation. In addition, the roller 31 of the third mast 30 abuts against the sub link 29 of the back stopper device 26 and is prevented from rotating.
[0022]
On the other hand, the sub rope is pulled out from the sub winch, and the tip of the rope is guided to the tip side of the base jib section 22.
When guiding the sub-rope, the operator guides the rope by holding the tip of the rope in his / her hand, but the walking stand disposed on the back of the third mast 30 from the telescopic boom 21 to the base jib section 22. 35 and the step provided in the back stopper device 26, it is possible to move easily and safely by the pedestal 35 and the step even if the scaffold is bad from the boom tip to the base jib section 22. . Further, since the roller 31 located in the vicinity of the walking platform 35 included in the third mast 30 is prevented from rotating by the sub link 29 of the back stopper device 26, the operator has caused his / her foot to contact the roller 31 by mistake. Even if it does not rotate, it is possible to prevent accidents such as the operator falling or stepping off.
[0023]
When a split jib that forms an intermediate jib section or a top jib section is connected to the tip of the base jib section 22, the base jib section 22 that has been in a substantially horizontal state is suspended by the operations of extending and raising the telescopic boom 21. To be in a substantially vertical state. FIG. 2 shows a state in which the base jib section 22 is suspended. In this state, when the base jib section 22 rotates downward about the rotation fulcrum, a support base 33 integrated therewith is provided. Rotate. When the support base 33 rotates, the first link 30 </ b> A having the support shaft 34 at the tip of the support base 33 forms a swing fulcrum is pulled, and the pedestal stands from the state of being tilted as shown in FIGS. 1 and 2. When the first link 30A is erected, the second link 30B whose pivot end is pivotally supported together with the first link 30A is also pulled and raised, and the position of the roller 31 at the swing end is the rotation fulcrum of the base jib section 22. Rather than the boom. Since the position of the roller 31 is positioned forward of the position of the rotation fulcrum of the base jib section 22, the arm length around the rotation shaft 23 when the mast is raised is increased, and the second mast tip and the air sheave are Can be shortened.
[0024]
On the other hand, the first and second masts 24 and 25 pass through the position occupied by the third mast 30 when they are raised by the pulling of the tension rope. Since the passage space for the three masts 30 is formed, the first and second masts 24 and 25, particularly the second mast 25 are raised up without interfering with each other.
[0025]
According to the present embodiment, the roller 31 included in the third mast 30 can be supported by the hydraulic cylinder 27 and the sub link 29 included in the back stopper device 26, so that at least the luffing jib mounting base 20 and the base jib section 22 are supported. In a state where the axes are parallel, the third mast can be stored within the range of the height of the luffing jib attachment base 20.
Moreover, since the position of the rocking | fluctuation fulcrum (support axis | shaft 32, 34) of the 1st, 2nd links 30A and 30B is put together on the same side, the 3rd mast 30 can be made into the state which folds up links. In addition, since the position of the oscillating fulcrum is located closer to the base end side than the tip of the luffing jib attachment base 20, a part of the length occupied by each link is taken in as a part of the length of the luffing jib attachment base 20. Therefore, the space occupied by the third mast 30 in the vicinity of the fluffing jib mounting base 20, that is, the space in the height direction and the length direction can be reduced.
[0026]
【The invention's effect】
According to the first aspect of the present invention, the first link has the swing fulcrum on the luffing jib attachment base, and the second link has the swing fulcrum on the base jib section. Accordingly, it is possible to selectively set a state in which the third mast falls and a state in which the third mast falls. In particular, when the base jib section is not standing upright substantially parallel to the luffing jib mounting base, the protruding height is lowered by the third mast being brought down, and the base jib section is suspended from this state. At the time of assembly, it is possible to automatically stand up according to the swing of the base jib section so that the tension rope can be hung. As a result, it is possible to eliminate an inadvertent height when not in use so as not to get in the way. In addition, when the first and second masts are raised, it is only necessary to interlock with the base jib section without using a special driving source, so that the structure is prevented from becoming complicated and the increase in the moment borne by the boom is suppressed. Thus, it becomes possible to improve the work performance of the crane work.
[0027]
According to invention of Claim 2, 4 and 5, since the 3rd mast is located inside the 1st and 2nd mast, when the 3rd mast is in the state which fell down, and the 1st, 2nd mast The 3rd mast does not interfere with the 1st and 2nd mast when is standing. And since there is a walk stand in the back of the 3rd mast in the state which does not interfere with the 1st and 2nd mast, it can walk on the 3rd mast. This makes it possible to improve workability when assembling the roughing jib.
[0028]
According to the third aspect of the present invention, since the first to third masts are assembled at the same time, when assembling the luffing jib, it is only necessary to connect the previously assembled first to third masts. The work of assembling three masts is not necessary. This makes it possible to improve the assembly work efficiency.
[Brief description of the drawings]
FIG. 1 is a view showing a part of a jib section used for a luffing jib according to the first to fifth aspects of the present invention;
FIG. 2 is a view for explaining an intermediate stage of assembly of the jib section shown in FIG. 1;
FIG. 3 is a plan view of a main part of the jib section shown in FIG. 1;
FIG. 4 is a diagram for explaining an example of a luffing jib having a third mast. It is a figure for demonstrating a part like the example shown in the figure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Roughing jib 20 Roughing jib attachment base 21 Telescopic boom 22 Base jib section 24 1st mast 25 2nd mast 26 Back stopper device 30 3rd mast 30A 1st link 30B 2nd link 31 Roller 32 The rocking fulcrum of 2nd link is made. Spindle
33 Supporting stand 34 Support shaft 35 that forms the pivot point of the first link Pedestal

Claims (5)

The base jib section and the intermediate jib section or top jib section are connected in order by connecting the divided jib while extending from the tip of the boom while extending the telescopic boom, and the luffing jib is held at an arbitrary angle after the connection. For this purpose, in the crane with the roughing jib provided with the third mast that pulls up the first and second masts arranged in the front-rear direction of the telescopic boom in the vicinity of the base jib section.
The third mast includes first and second links, and the first and second links are equipped with rollers for swinging the tension rope and swinging the tension rope,
The front end of the first link extended from the base fixed to the base jib section is extended to the front end of the support base extended toward the connecting position side of the luffing jib attachment base and the telescopic boom. Has a swing fulcrum,
The second link has a swing fulcrum luffing jib mounting base provided in the telescopic boom tip,
When the base jib section and the luffing jib mounting base are in a substantially parallel state, the swing end can be tilted toward the tip end side of the base jib section, and the base jib section is in contact with the luffing jib mounting base. When the suspension is suspended while standing, the first link having the swing fulcrum at the tip of the support base is pulled and stands by the rotation of the support base integral with the base jib section . A crane with a luffing jib, wherein the second link is raised to position the roller in front of a rotation fulcrum of the base jib section.   The crane with a luffing jib according to claim 1, wherein the third mast is disposed inside the first and second masts in the width direction of the luffing jib.   2. The crane with a luffing jib according to claim 1, wherein the third mast is attached with swinging fulcrums of the first and second links when the luffing jib attachment base and the base jib section are connected. Roughing jib crane.   The crane with a luffing jib according to claim 1, wherein the first and second masts have a range corresponding to a rising locus of the third mast as a passage space for the third mast. crane.   The crane with a luffing jib according to claim 1, wherein a walking platform is provided on a back surface of the third mast.

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