JP2547044B2 - Jib loading and unloading method and device in crane - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and apparatus for loading and unloading a jib in a crane, and more particularly, to easily loading and unloading a large jib at the top of the innermost boom of a telescopic boom in a large crane. The present invention relates to a jib loading / unloading method and device in a crane that can be quickly performed.

(Prior Art) As a conventional jib loading / unloading method and device, a telescopic boom that is hoisted and operated by a derrick cylinder is provided in a swivel part on the vehicle body of a crane vehicle, and the telescopic boom swivels the base part. The second boom, the third boom, and the fourth (innermost) boom that are telescopically operated by telescopic means such as a hydraulic cylinder can be sequentially slidable inside the outermost (first) boom pivotally attached to the section. It is constructed by inserting it inside, and a jib is provided on the top of the innermost boom so that it can be raised and lowered, and this crane truck is moved to the destination, and the outrigger is extended to set it in place. In addition to the loading operation by the hook block at the end of the rope hanging from the head block provided at the top of the inner boom, After the split first (base) jib block is pivotally mounted so that it can be undulated, the jib blocks of the second and lower ranks are hoisted and sequentially attached to the top of the first jib block by another crane or the like, and the sheave on the top is There is a hook block at the end of the rope that is suspended from the cargo handling operation for the target suspended load.

(Problems to be Solved by the Invention) However, in such a conventional jib loading / unloading method for a crane, the jib is laid down on the turning part of the vehicle body each time the cargo handling work is started. To the head block fixed to the innermost boom top of the telescopic boom, the base of the first jib (mounting) block that forms the base of the jib is pivotally attached to the head block, and then the top of the first jib block is sequentially required. The jib and telescopic boom assembled by attaching several jib blocks are erected, and the hook block at the end of the main rope suspended from the sheave at the top of the jib is used for loading and unloading the intended suspended load. Every time the loading and unloading work is finished, the jib is laid down on the revolving part together with the telescopic boom, and then the jib is disassembled sequentially from the top diblock. In addition, since it was necessary to remove the first jib block from the top of the innermost boom, the loading and unloading operation of the jib was troublesome. Each jib block that makes up is large and becomes heavy, or it is necessary to divide it into a number of short and small to make it lightweight, and in any case, its loading and unloading operation is not easy, and,
Since the first jib block and all subsequent jib blocks were assembled or divided side by side on the extension line of the base bracket fixed to the top of the innermost boom of the telescopic boom lying on the swivel part, at the time of assembling or dividing There is a problem that it requires a vast space.

Further, in such a conventional jib loading / unloading method and device in a crane, when the assembled jib is erected alone or together with the telescopic boom, the end of the main rope suspended from the sheave at the end of the jib is Because the hook block receives centrifugal force based on the turning when the jib is raised, the hook block that makes a larger turn than the end of the jib may collide with and damage equipment and buildings around the end of the jib that rotates. ,
There is also a problem that it takes a considerable amount of skill and a long time to assemble the jib because it is necessary to secure a sufficient space around the crane beyond the turning trajectory of the jib tip.

In view of such a conventional example, the present invention, at the start of the cargo handling work, first, slightly raises the retractable boom, and hangs the first jib block from the top of the base bracket attached to the top of the boom. Next, the divided winch jib blocks are sequentially lifted by the third winch rope that passes through the front-back direction penetrating portion of the base bracket and the lower part thereof is connected to the top part of the preceding jib block. Assembling the jib, and then allowing the jib and the telescopic boom to stand up so that the cargo can be handled.
After the loading and unloading work is completed, the procedure is almost reversed to disassemble and remove the jib from the top of the telescopic boom so that the jib can be removed from the crane without problems as described above. The present invention seeks to provide a method and apparatus.

(Means for Solving Problems) The present invention, in order to solve the problems of the conventional example as described above, is provided on the top of the base bracket attached to the innermost boom top of the telescopic boom undulating on the swivel base. The base of the first jib block is pivotally attached, and the third winch rope that hangs from the through portion of the base bracket in the front-rear direction is used to sequentially hang the divided jib blocks of the second and lower positions of the jib. Each time when the jib block of the previous order is hung from the jib block of the jib that is attached to or assembled to the jib block and then removed, and each time the jib block of the previous order is attached or the jib block of the previous order is removed, The height of the jib block in the rear or front, the height of the jib block, and the jib in the crane for erecting and / or extending or retracting and / or retracting the telescopic boom. The base part is attached to the innermost boom top of the telescopic boom that can be undulated with respect to the swivel part, and the base part of the first jib block is attached to the top part of the base bracket having a through part in the front-rear direction. And a base part of the mast is rotatably mounted around a shaft mounting part between the base bracket and the first jib block, and a divided jib is formed at a front-back penetrating part of the base bracket. A third winch rope for operation such as a block is suspended and hung.

(Operation) Since the present invention has the above-described configuration, the base portion of the first jib block is axially attached to the top portion of the base bracket attached to the top portion of the innermost boom of the telescopic boom that undulates on the swivel base. The third winch rope hanging from the penetrating portion of the base bracket sequentially lifts the divided jib blocks of the second or lower rank and attaches to the preceding jib block, or the rear rank of the jib assembled. The jib blocks of the preceding order are hung and removed from the jib block in sequence, and each time the jib block of the preceding order is attached or the jib block of the preceding order is removed, the height corresponding to the height of the jib block of the posterior or preceding order, By raising and / or extending the telescopic boom, or laying down and / or contracting the swivel base by the third winch rope of the relevant crane. Assemble the jib on the top of the telescoping boom that undulates above, or split the assembled jib.

(Embodiment) A jib loading / unloading method and device in a crane according to the present invention will be described below with reference to the accompanying drawings showing an embodiment of a device suitable for carrying out the method.

In the figure, 1 is a crane truck, 2 is a car body, 3 is a car body 2
Upper turning part, 4 is an outrigger, 5 is a derrick cylinder,
Reference numeral 6 denotes a telescopic boom. The telescopic boom 6 has a base portion which is supported by the revolving portion 3, and sequentially slides in a first (outermost) boom 7, which is raised and lowered by a derrick cylinder 5, and inside the first boom 7. The second boom 8, the third boom 9, and the fourth (innermost) boom 10, which are inserted so as to be capable of being expanded and contracted by appropriate expansion and contraction means such as a hydraulic cylinder and a rope (not shown),
It is configured as a four-stage telescopic boom. Reference numeral 11 is a top portion of the fourth boom 10, 12 is a shaft 13 mounted around the top portion 11 of the fourth boom 10, and a head block fixed to the top surface or side surface (state of FIG. 1) of the top portion 11 is a sheave. is there.

Reference numeral 20 is a mounting member for mounting the jib 30 on the top 11 of the innermost boom 10 of the telescopic boom 6, and the mounting member 20 is mounted on the base of the fourth boom.
10 A base bracket 21 having a pin 22 as a mounting means to the top portion 11, and a base portion of a first jib block 31 having a pin 39 as a mounting means for a jib block 32 on the top portion of a top portion 23 of the base bracket 21. The main part is composed by wearing 27. Reference numeral 21A is a through portion that extends in the front-rear direction (up and down in FIG. 3) in the central portion of the base bracket 21.
A guide sheave 24 is provided at a lower inner portion (left side in the figure) of 21A, and guides a third winch rope 60 which is inserted into and suspended from the penetrating portion 21A.

The penetrating portion 21A may be formed at a position that does not hinder the operation of the jib blocks 32 to 36 by the third winch rope 60 when the first jib block 31 is folded to the base bracket 21 side. The rope 60 is formed to have a size such that the rope 60 can freely move in the front-rear direction from the central portion or the lower portion thereof. Also, 24A
Is a third winch rope 60 overwind detector, 24B is the same rope 6
It is an overwinding prevention weight of 0.

Reference numeral 25 is a first (auxiliary) mast having a shaft 26 attached to the outside (upper side in FIG. 1) of the top portion 23 of the base bracket 21, and 27 is a first
The first rope has a required length as a connecting member that connects the top of the mast 25 and the base of the base bracket 21. 28 is a first mast of the top portion 23 of the base bracket 21 when the first rope 27 is extended (Fig. 5) by clipping 29 the central portion thereof.
It is an auxiliary rope that is suspended and supported from around the 25 base attachment part.

30 is a jib, 31 is a base on the top of the base bracket 21
37 The first jib block as the base of the jib 30 mounted, 32 is the second jib block 33 to 35 whose base is connected to the top of the first jib block 31 by a pin 39 as a mounting member.
Is the third to fifth jib block similar to this, 36 is the sixth
(Top) jib blocks, these are the second jib blocks 32
Pins 39 on top (bottom in Fig. 5) in the same manner as the former
Will be stopped. 38 is a sheave on the top of the sixth jib block 36.

Reference numeral 41 is a bifurcated bracket axially attached to the bracket of the base of the first jib block 31, 42 is a second mast axially attached to the base of the bifurcated bracket 41, 43 is a sheave on the top of the second mast 42, 44
Is a second rope connecting the top of the first mast 25 and the top of the second mast 42, 46 is a third mast that is integral with the forked bracket 41, 47 is a sheave at the top of the third mast 46, and 48 is a second mast.
A third connecting member (equalizer link) that connects the tops of 42 and the second mast 46, and 49 is a fourth rope that connects the tops of the third mast 46 and the first jib block 31, and the first rope 25,
The second rope 44, the third connecting member 48, and the fourth rope 49 have a maximum opening angle between the base bracket 21, the first to third masts 25, 42, 46, and the first jib block 31, which are connected to each other. And limit the minimum value of the proximity angle α between the base bracket 21 and the first jib block 31,
The inner contact between the two 21 and 31 is prevented.

50 is a sub jib with a base 51 attached to the top of the sixth jib block 36, 52 is a sheave on the top of the sub jib 50, 53 is a fourth mast, and 54 is a second for setting the undulation angle of the sub jib 50 with respect to the main jib 30. Tension rope, 55 is the third mast
It is the first tension rope provided between the top of 46 and the top of jib 30.

56 is the main (first winch) rope, 57 is the same rope 56
Main hook block at the end, 58 is the second mast at the end 42
With a sub (second) winch rope fixed to the protrusion 59 at the top of the rope, the rope 58 is rewound and rewound by a winch (not shown) on the crane vehicle 1 so that the second mast is passed through the top of the first mast 25. The top of the mast 42 is pulled, and the third connecting member
The first jib block 31 is stretched via the 48, the third mast 46, and the fourth rope 49, thereby restricting the opening degree of the first jib block 31 with respect to the base bracket 21.

60 is the third winch rope, this third winch rope
60 hangs through the penetrating portion 21A of the base bracket 21,
A third hook block 61 is provided at its end. 71 and
72 is a sling rope.

 Next, the operation of this embodiment will be described.

First, the crane vehicle 1 is moved to a target cargo handling point, the outrigger 4 sets the vehicle body 2 at a predetermined position, and then the telescopic boom 6 is tilted onto the turning portion of the crane vehicle 1,
When the head block 12 is provided above the top portion 11 of the fourth boom 10, the head block 12 is attached to the shaft 13 thereof.
Turn counterclockwise around the wear part (Fig. 3) to top 11
Fixed on the outside (upper side in the figure).

Then, the base of the first jib block 31 and the first mast 25.
The bases of the shafts 37 and 26 on the top of the base bracket 21, and the second and third masts on the base of the first jib block 31.
The mounting member 20 in which the base portions of 42 and 46 are axially mounted via the bifurcated bracket 41 is lifted by any of the first to third masts 25, 42 and 46, and the base portion of the base bracket 21 is pinned.
Attach it to the top 11 of the innermost boom 10 with 22 as shown in Fig. 2. At the time of this lifting, the base bracket 21 and the first
If you keep the jib block 31 horizontal, you can lower the ground height when hoisting, so the top of the innermost boom 10
The attachment operation of the attachment member 20 to the 11 is further facilitated. Also, at this time, the first tension rope 55 having the main rope 56 and the base portion connected to the top of the third mast is attached to the first jib block.
Drop it in front of 31.

Next, the telescopic boom 6 is slightly raised and the second boom
Loosen the winch rope 58 and move the first jib block 31
As shown in the figure, it is hung from the shaft 37 attachment part on the top. However, in this state, the second jib block 32 is not attached at the end.

Then, the third hook block 61 at the end of the third winch rope 60 lifts up around the center of gravity G of the second jib block 32 via the sling rope 71, and the lower part (right side in FIG. 1) of the first jib is lifted. Fix the pin 39 to the top of the block 31 (lower part in the figure), and move the telescopic boom 6 back and forth to the second jib 32.
The first jib block by standing up and / or extending by the length of the
After raising 31 and loosening the third winch rope 60,
The jib block 32 is hung below the first jib block 31, while the main hook block 57 at the end of the main rope 56.
After that, the second jib block 32 is pulled counterclockwise via the sling rope 72, and the other side of the lower part thereof is fixed to the other side of the top of the first jib block 31 by the pin 39 and attached as shown in FIG.
The sling ropes 71, 72 of the third hook block 61 and the main hook block 57 are removed from the second jib block 32.

The second jib block to the top of the first jib block 31
When mounting the 32, if the first jib block 31 is lifted up in advance by an amount corresponding to the height of the second jib block 32 and then the two are connected together, one side of the base of the second jib block 32 should be the first. After fixing the pin 39 to one side of the top of the jib block 31,
It is not necessary to raise the first jib block 31 by an amount corresponding to the height of the second jib block 32 when rotating the second jib block 32 in the counterclockwise direction, that is, during the attachment of both, but in this case, Pins on both sides of both jib blocks 31 and 32
Both 39 and 39 stop positions are high places of the height of the second jib block 32.

Next, the telescopic boom 6 is further erected and / or extended and the third hook block at the end of the third winch rope 60 is attached in substantially the same manner as the jib blocks 31 and 32.
The sling rope 71 engaging with the third jib block 33
Around the center of gravity of the second jib block 32, and fixed to the top (lower in FIG. 4) of the second jib block 32 with pins 39, 39, and so on, similarly to the fourth, fifth, and sixth (top) jib blocks 34, 35, 36. Are sequentially connected by pins 39 and 39, the jib 30 is assembled as shown in FIG. 5, and both ends of the second tension rope 55 are attached to the top of the jib 30 and the top of the fourth mast 46. Then, the second winch rope 58 is wound, and the second mast 42, the third connecting member 48, and the third
The jib 30 is rotated counterclockwise (FIG. 5) via the mast 46 and the first tension rope 55 to stand up, and the hook block 57 hanging from the sheave 38 at the top of the jib 30 performs a normal cargo handling operation.

Although not shown, if the jib block of the preceding rank is sufficiently lifted, the jib block of the latter rank can be vertically lifted by the third winch rope 58 and connected to the jib block of the preceding rank.

Next, a procedure for attaching the sub jib 50 to the top of the jib 30 assembled as shown in FIG. 5 will be described (not shown).

First, from the penetrating portion 21A of the base bracket 21 attached to the top of the innermost boom 10 of the telescopic boom 6 extending upright to the third
The winch rope 60 hangs down, and the hook block 61 at its end hooks and pulls the sling rope 71 to the center of gravity of the sub jib 50. , Remove the sling rope from the sub jib 50.

Next, the telescopic boom 6 is further raised by the derrick cylinder 5, while the sub rope 58 and the main rope 56 are
The jib 30 and sub jib 50 in a counterclockwise direction (5th
(See Fig.) To stand up as shown in Fig. 6, and set the standing angle by the second winch rope 58 for a while.
50 Hook block from top jive 52 through rope 56
Suspend 57. The subsequent cargo handling procedures are the same as for normal cranes.

Next, the jib 30 and sub jib after the end of the cargo handling work
To remove the innermost boom 50 from the top of the boom 10, first, from the state shown in FIG. 6, loosen the hoisting operation rope of the sub jib 50 to rotate the sub jib 50 clockwise around the shaft 51 and loosen the sub rope 58. Rotate the jib 30 in the same direction,
With the sling rope of the hook block 61 at the end of the third winch rope 60, the suspended sub-jib 50 is further rotated clockwise around the shaft 51 to make it horizontal, and then lowered to the ground.
Unplug 51 and separate from the top of jib 30.

Next, in order to divide the jib 30, the pin 39 on the outside (right side in the figure) of the top (6th) jib block 36 base of the hanging jib 30 as shown in FIG. The sling rope 71 is hung on the top of the block 36, and the hook block 61 of the third winch rope 60 pulls it inward (left side) to make it horizontal, and the telescopic boom 6 is contracted to bring the sixth jib block 36 to the ground. Place (FIG. 7) and pull out the pin 39 on the other side to separate it from the top of the fifth jib block 35. At this time, if the sling rope 71 is hung on the center of gravity of the sixth jib block and the same jib block 36 is hung horizontally, the sixth jib block 36 can be removed from the fifth jib block without being placed on the ground. Can be separated.

The procedure for dividing the fifth to second jib blocks 35 to 32 is also similar to the above. First, after removing the pin 39 on one side (outer side) of the connection base of each jib block, the sling of the third winch rope 60 is performed. After being pulled horizontally by the book block 61 with the rope 71, the other pin 39 is pulled out and separated.

In addition, if the center of gravity of the second jib block 36 to 32, which is not the sixth, is suspended by a sling rope, the separated jib blocks 36 to 32 can be swung by the telescopic boom 6 so that the third winch rope is used. Can be carried out to the right place while hanging.

Although not shown, it is needless to say that the sub-jib 50, which is configured to be divided into an appropriate number, can be assembled and divided in the same manner as the assembly and division of the jib 30.

In addition, the first jib block 31 with the base bracket 21,
By any means, hoist it horizontally by appropriate means,
Remove the innermost boom 10 from the top 11.

(Effects of the Invention) Since the present invention has the above-described configuration and operates, the following effects can be obtained.

(1) Without the need for cargo handling equipment such as other cranes,
The crane's telescopic boom and third winch rope can be used to assemble and split the jib.

(2) Since the third winch rope of the crane allows hoisting and hanging operations of each jib block, even if a large jib is divided into a relatively large number of large jib blocks without being subdivided, Does not require much labor for assembly and division.

(3) Since the large jib can be divided and configured as a relatively small number of jib blocks, the number of times of assembling the jib block can be reduced, and the assembly time of the large jib block can be shortened.

(4) Assembling and splitting of the jib can be performed by undulating and / or extending the telescopic boom and hoisting and rewinding the third winch rope, so a vast space is not required at the time of assembling.

When the assembled jib is raised, the hook block hanging from the sheave at the top of the jib can be pulled and locked by the third winch rope. , The hook block is not fluttered around, and there is no danger of inadvertently damaging the objects, buildings, etc. around the moving path of the jib top.

If the guide sheave is provided on the lower front side of the front-back direction penetrating portion of the base bracket, the third winch rope can be operated smoothly.

[Brief description of drawings]

The drawings show an embodiment of an apparatus suitable for carrying out the method for loading and unloading a jib in a crane according to the present invention,
FIGS. 1, 2, 4, and 5 are side views showing a schematic structure of each jib assembling step by this device, and FIG. 3 is a side view around a base bracket base forming a main part of this device. FIG. 6 is a schematic side view of a crane in which this device is assembled, and FIG. 7 is an explanatory view of how to divide the top jib block. 3 ... Revolving part, 6 ... Telescopic boom, 10 ... Fourth (innermost) boom, 11 ... Top part, 14 ... Sheave, 20 ... Mounting member, 21 ... Base bracket, 21A ... Penetration part , 23 …… top, 24 …… sheave, 25 …… (first) mast, 30 …… jib, 31 …… first jib block, 32 to 36 …… second to sixth jib block, 37 …… axis , 39 …… pin, 41,46 …… (second and third) mast, 60 …… third winch rope.

Claims (3)

(57) [Claims] 1. A base part of a first jib block is pivotally attached to the top part of a base bracket attached to the top part of the innermost boom of a telescopic boom undulating on a swivel base, and the base part of the first jib block is hung from a through part of the base bracket in the front-rear direction. Using the 3rd winch rope, the jib blocks divided into the second place and below divided from the jib are sequentially lifted and attached to the jib block of the preceding rank, or the jib blocks of the rear rank of the assembled jib are sequentially preceded. Each time the block is hung and removed, and the jib block of the rear rank is attached or the jib block of the front rank is removed, the telescopic boom is raised and / or extended according to the height of the jib block of the rear rank or the front rank. ,
Alternatively, a method of loading and unloading a jib in a crane, which is characterized by laying down and / or contracting. 2. A base portion is attached to an innermost boom top portion of a telescopic boom capable of undulating with respect to a swivel portion, and a base portion of a first jib block is pivotally attached to a top portion of a base bracket having a front-rear penetrating portion. , The base bracket and first
A base portion of the mast is rotatably pivoted around a pivotal attachment portion with a jib block, and a third winch rope for operation such as a divided jib block is inserted into a penetrating portion of the base bracket in the front-rear direction. A device for loading and unloading a jib in a crane characterized by being suspended. 3. The loading / unloading of a jib in a crane according to claim 1, wherein a guide sheave of the third winch rope is provided on a lower front side of a front-back direction penetrating portion of the base bracket. apparatus.