JPH0192198A - Method and equipment for mounting and dismounting jib to crane - Google Patents

Abstract

PURPOSE: To facilitate the attaching and detaching operation of a jib and minimize the space in assembling and dividing by raising and extending or falling and contracting an extension boom by the quantity corresponding to the height of a jib block on all occasions of attachment or detachment of a jib block of the latter or former order. CONSTITUTION: A fallen extension boom 6 is slightly raised, and a first jib block 31 is suspended from the top part of a base bracket 21. A divided jib block of the latter order is successively suspended by a third winch rope 60 suspended from the through part of the base bracket 21, and mounted on a jib block of the former order, and the extension boom 6 is raised and/or extended by the quantity corresponding to the height of the jib block on all such occasions to successively assemble a jib. A loading work is performed by raising the jib and the extension boom, and the substantially reverse operation is performed after the loading is ended to disassemble and remove the jib from the top part of the extension boom 6. Thus, the attaching and detaching operation of the jib is facilitated, and a wide space is not required for the assembling or disassembling.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a method and device for loading and unloading a jib in a crane, and in particular, a method and device for loading and unloading a jib on a crane, in particular, a method and apparatus for loading and unloading a large jib on the top of the innermost boom of a telescopic boom in a large crane. The present invention relates to a method and device for quickly mounting and dismounting a jib on a crane.

(Prior Art) As a conventional method and device for mounting and dismounting a jib in a crane, a telescoping boom that is operated to raise and lower by a derrick cylinder is provided at a revolving section on the body of a crane vehicle, and the telescoping boom moves the base of the crane into the swing section. The outermost (first
) A second boom, a third boom, and a fourth (innermost) boom, which are telescopically operated by an extensible means such as a hydraulic cylinder, are slidably inserted in order into the inside of the boom; A jib is installed at the top of the inner boom so that it can be raised and lowered, and after the crane truck is moved to the destination and the outriggers are extended and installed at a predetermined position, the jib is suspended from the head block installed at the top of the innermost boom of the telescopic boom. In addition to carrying out cargo handling operations using the hook block at the end of the rope, first, the head block attached to the top of the innermost boom is
After the divided first (base) jib block is pivoted so that it can be raised and lowered, the second and lower jib blocks are lifted and installed in sequence on the top of the first jib block using another crane, etc., and the sheave at the top is attached. There are some types of equipment that use a hook block at the end of a rope to handle the intended cargo.

(Problems to be Solved by the Invention) However, in the conventional method and device for mounting and dismounting the jib in a crane, the jib is lowered onto the swivel part on the car body each time cargo handling operations are started using the jib. The base of the first jib (attachment) block, which forms the base of the jib, is pivoted to the head block fixed to the top of the innermost boom of the telescopic boom, and then the first jib block is attached to the top as required in order. 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 is used to carry out cargo handling work. Each time cargo handling work is completed, the jib is lowered together with the telescopic boom onto the revolving section, and then the jib is sequentially disassembled starting from the top jib block, and the first jib block is moved to the innermost side. Since it was necessary to remove the jib from the top of the boom, mounting and dismounting the jib was troublesome, especially in the case of large cranes that are frequently used these days. Either it is heavy, or it is necessary to reduce the weight by dividing it into many short and small pieces, and in any case, it is difficult to install and remove it, and the innermost boom of a telescopic boom that lies down on the revolving part. Since the first jib block and all subsequent jib blocks are assembled or divided side by side on the extension line of the base bracket fixed to the top, there is a problem in that a vast space is required for the assembly or division.

Furthermore, in such conventional methods and devices for mounting and dismounting jib in cranes, 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 due to the rotation when the jib is raised, the hook block, which rotates more than the end of the jib, may collide with equipment or buildings around the rotating end of the jib, causing damage. There is also the problem that assembling this jib requires considerable skill and a long time, such as the need to secure enough space around the crane to exceed the rotation locus of the tip of the jib.

In view of such conventional examples, the present invention, at the start of cargo handling work, first slightly raises the retractable boom that is lying down,
The first jib block is suspended from the top of the base bracket attached to the top of the first jib block, and then the next jib block is divided by a third winch rope that passes through the front-back penetration part of the base bracket and is suspended. The jib is assembled by sequentially lifting the lower part of the jib block and connecting it to the top of the preceding jib block, and then the jib and telescopic boom are erected to enable cargo handling work.After the cargo handling work is completed, An attempt is made to provide a method and device for mounting and removing a jib on a crane that does not have the above-mentioned problems by performing almost the opposite operation to allow the jib to be disassembled and removed from the top of the telescopic boom. It is something to do.

(Means for Solving the Problems) In order to solve the problems of the conventional example as described above, the present invention has a base bracket attached to the top of the innermost boom of a telescopic boom that rises and falls on a swivel platform. The base of the first jib block is pivoted, and a third winch rope that hangs down from the front-rear penetration part of the base bracket is used to sequentially lift the second and lower jib blocks of the divided jib to the previous one. Suspend and remove the preceding jib block from the rear jib block of the jib that is attached or assembled to the jib block, and each time the rear jib block is installed or the preceding jib plotter is removed, A method for mounting and dismounting a jib in a crane, in which the telescopic boom is raised and/or extended, or lowered and/or contracted, by an amount corresponding to the height of a rear or front jib block.

Further, the base is attached to the innermost boom top of the telescopic boom that can be raised and lowered with respect to the rotating part, and the base of the first jib block is pivotally attached to the top of the base bracket having a penetration part in the front and rear direction. The base of the mast is rotatably attached around the pivoting portion between the bracket and the first jib block, and a third winch for operating the divided jib block, etc. is provided in the longitudinally penetrating portion of the base bracket. A rope is inserted through it and suspended.

(Function) Since the present invention has the above-described configuration, the base of the first jib block is pivoted to the top of the base bracket attached to the top of the innermost boom of the telescopic boom that rises and falls on the swivel base, and The third winch rope hanging down from the penetration part of the base bracket sequentially lifts the second and lower divided jib blocks of the jib and attaches them to the front jib block, or the rear jib block of the assembled jib. The jib blocks in the front position are suspended and removed from the jib plotter in sequence, and each time the jib block in the rear position is installed or the jib block in the front position is removed, an amount corresponding to the height of the jib block in the rear position or the front position, By raising and/or extending the telescopic boom, or lowering and/or contracting the telescopic boom, the third winch rope of the relevant flare lane is used to assemble a jib on the top of the telescopic boom that is undulating on the swivel platform, or to split the assembled jib. .

(Embodiment) Hereinafter, a method and apparatus for mounting and dismounting a jib in a crane according to the present invention will be described with reference to the accompanying drawings showing an embodiment of a suitable apparatus for carrying out the method.

In the figure, 1 is a crane truck, 2 is a car body, 3 is a rotating part on the car body 2, 4 is an outrigger, 5 is a derrick cylinder, and 6 is a derrick cylinder.
is a telescopic boom, and the base of the telescopic boom 6 is connected to the rotating part 3.
A first (outermost) boom 7 is supported by a shaft and is raised and lowered by a derrick cylinder 5, and a first (outermost) boom 7 is slidably inserted into the inside of the first boom 7 and is moved by an appropriate expansion/contraction means such as a hydraulic cylinder or a rope (not shown). Second boom 8 that is telescopically operated
, the third boom 9 and the fourth (innermost) boom 10,
It is configured as a 4-stage telescopic boom. 11 is the 4th boom 1
12 is a head block attached to the shaft 13 around the top 11 of the fourth boom 10 and fixed to the top or side surface of the top 11 (as shown in FIG. 1), and 14 is a sheave.

2o is a mounting member for mounting the jib 30 to the top 11 of the innermost boom 10 of the telescopic boom 6, and the mounting member 20 includes a pace bracket 21 having a pin 22 at its base as a means for mounting to the top 11 of the fourth boom 10; The main part is constructed by attaching the base of the first jib block 31, which has a pin 39 on the top as a means for attaching the jib block 32, to the top 23 of the base bracket 21, and attaches it to the shaft 27. 21
A is a penetrating portion extending in the front-rear (up and down in FIG. 3) direction at the center of the base bracket 21, and a guide sheave 24 is provided at the inner lower part of the penetrating portion 21A (on the left side in the figure), and a guide sheave 24 is provided in the penetrating portion 2LA. Third winch rope 60 inserted and suspended
to guide you.

Note that this penetrating portion 21A may be formed in a position where it does not interfere with the operation of the jib blocks 32 to 36, etc. by the third winch rope 60 when the first jib block 31 is folded toward the base bracket 21 side. , usually in the front-back direction from the center or the bottom,
The rope 60 is formed to have a size that allows it to move freely. Further, 24A is a suitable person detection device for the third winch rope 60, and 24B is a weight for preventing overwinding of the third winch rope 60.

Reference numeral 25 denotes a first (auxiliary) mast whose base is attached to a shaft 26 on the outside (upper side in FIG. 1) of the top 23 of the base bracket 21;
Reference numeral 7 designates a tenth rope having a required length as a connecting member that connects the top of the first mast 25 and the base of the base bracket 21. 28, when the 10th-pull 27 is expanded (Fig. 5),
Clip 29 the center part of the base bracket 2
This is an auxiliary rope that is suspended and supported from around the shaft attachment part of the base of the first mast 25 of the first mast 25 of the top part 23.

Reference numeral 30 denotes a jib, 31 a first sib protector as the base of the jib 30 whose base is attached to the top of the base bracket 21 by a shaft 37, and 32 the base connected to the top of the first jib block 31 by a pin 39 as a mounting member. 33 to 35 are similar third to fifth jib blocks, and 36 is a sixth (top) jib block. ,
They are sequentially secured with pins 39 in the same manner as the former. 38 is a sheave at the top of the sixth jib block 36.

41 is a two-pronged bracket pivoted to the bracket at the base of the first jib block 31, 42 is a second mast whose base is pivoted to the two-pronged bracket 41, 43 is a sheave at the top of the second mast 42, and 44 is the first A 20th bracket 46 connects the top of the mast 25 and the top of the second mast 42 to a two-pronged bracket 41.
47 is a sheave at the top of the third mast 46; 48 is a third connecting member (equalizer link) connecting the tops of the second mast 42 and the second mast 46;
9 is a 40th pipe connecting the tops of the third mast 46 and the first jib block 31;
4. The third connecting member 48 and the 40th-group 49 are connected to the base bracket 21 and the first to third connecting members, respectively.
The maximum opening angle between the mast 25, 42, 46 and the first jib block 31 is limited, and the minimum value of the proximity angle α between the base bracket 21 and the first jib block 31 is limited. Prevents inside abutment.

50 is a sub-jib whose base is attached to the shaft 51 at the top of the sixth jib block 36; 52 is a sheave at the top of the sub-jib 50; 53
is a fourth mast, 54 is a second tension rope for setting the up-and-down angle of the sub-jib 50 with respect to the main jib 30, and 55 is a first tension rope provided between the top of the third mast 46 and the top of the jib 30.

56 is a main (first winch) rope, 57 is a main hook block at the end of the rope 56, 58 is a sub (second) winch rope whose end is fixed to a protrusion 59 at the top of the second mast 42, By winding and unwinding the rope 58 with a winch (not shown) on the crane vehicle 1, the top of the second mast 42 is pulled through the top of the first mast 25, and the third connecting member 48 and the third mast 46, 40th-P4
9, the first jib block 31 is pulled, thereby regulating the opening degree of the first jib block 31 with respect to the base bracket 21.

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

Next, the operation of this embodiment will be explained.

First, move the crane truck 1 to the target cargo handling location,
After the car body 2 is installed in a predetermined position by the outrigger 4, the telescopic boom 6 is lowered onto the revolving part of the crane truck 1, and when the head block 12 is provided above the top part 11 of the fourth boom 10, The head block 12 is fixed to the outside of the top portion 11 (on the upper side of the figure) by rotating the head block 12 counterclockwise (FIG. 3) around the mounting portion of the shaft 13.

Next, the base of the first jib block 31 and the first mast 2
The base of the shaft 37.2 is attached to the top of the base bracket 21.
6, and a second jib block 31 at the base of the first jib block 31.
The mounting member 20 with the base of the third mast 42.46 pivoted via the bifurcated bracket 41 is lifted by any of the first to third masts 25, 42, 46, and the base of the base bracket 21 is pinned. 22 to the innermost boom 1
0 top part 11 as shown in Fig. 2. Note that during this lifting, the base bracket 21 and the first jib block 31
By maintaining the boom horizontally, the height above the ground during lifting can be lowered, so that the operation of attaching the attachment member 20 to the top 11 of the innermost boom 10 becomes easier. Also, at this time, the first tension rope 55 whose main lobe 56 and base are connected to the top of the third mast is suspended in front of the first jib block 31.

Next, the telescopic boom 6 is raised slightly, and the second winch rope 58 is loosened to allow the first jib block 31 to hang from the shaft 37 at the top thereof as shown in FIG. However, in this state, the second jib block 32 is not yet attached.

Thereafter, the third hook block 61 at the end of the third winch rope 60 lifts the second jib block 32 around the center of gravity G via the sling rope 71, and
The right side in the figure) is fixed to the top of the first jib block 31 (lower part in the figure) with a pin 39, and before and after this, the telescopic boom 6 is raised and/or extended by an amount corresponding to the length of the second jib 32.
After raising the jib block 31, the third winch rope 60 is loosened to allow the second jib block 32 to hang below the first jib block 31. After pulling the second jib block 32 counterclockwise through the pin 39 and fixing the other side of its lower part to the other side of the top of the first jib plotter 31 as shown in FIG. 4, the third hook block 61 and the main Sling rope 71 for hook block 57.
72 from the second jib block 32.

In addition, when attaching the second jib block 32 to the top of the first jib block 31, first raise the hanging first jib block 31 by an amount corresponding to the height of the second jib block 32, and then connect the two. After fixing one side of the base of the second jib block 32 to one side of the top of the first jib block 31 with a pin 39, when rotating the second jib block 32 counterclockwise, that is, while the two are being attached, , it is not necessary to raise the first jib block 31 to the height of the second jib block 32, but in this case both jib blocks 31
The pins 39 and 39 on both sides of and 32 are both in the second position.
This is a high place at about the height of the jib block 32.

Then, in substantially the same manner as the two jib blocks 31, 32, the telescopic boom 6 is further erected and/or extended, and the sling rope 71 engages with the third hook block 61 at the end of the third winch rope 60. The center of gravity of the third jib block 33 is lifted up, and pins 39.39 are fixed to the top (lower in Fig. 4) of the second jib block 32, and in the same manner, the fourth, fifth, and sixth (top) shib blocks 3
4. Connect 35 and 36 with pins 39 and 39 in sequence, assemble the jib 30 as shown in Fig. 5, and attach the top of the jib 30 to the fourth mast 4.
Both ends of the second tension rope 55 are attached to the top of the tension rope 55. After that, the second winch rope 58 is reeled in, and the second
Mast 42, third connecting member 48, third mast 46, first
The jib 30 is rotated counterclockwise (
The hook block 57 hanging from the sheave 38 at the top of the hook block 57 is used for normal cargo handling operations.

Although not shown, if the front jib block is sufficiently lifted, the third winch rope 58 can vertically lift the rear jib block and connect it to the front jib block.

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

First, the third winch rope 60 is lowered from the penetration part 2LA of the base bracket 21 attached to the top of the innermost boom 10 of the telescopic boom 6 that is standing up and extending, and the sling rope 71 is attached to the sub-jib 50 by the hook block 61 at the end of the third winch rope 60. The base of the sub-jib 50 is attached to the shaft 38 in alignment with the top of the hanging jib 30, and the sling rope is removed from the sub-jib 50.

Next, while the telescopic boom 6 is further erected by the derrick cylinder 5, the sub rope 58 and the main rope 5 are
6 and rotate the jib 30 and sub-jib 50 counterclockwise (
The hook block 57 is suspended from the jeep 52 at the top of the sub-jib 50 via the rope 56. let The subsequent cargo handling procedures are the same as for ordinary cranes.

Next, the procedure for removing the jib 30 and sub-jib 50 from the top of the innermost boom 10 after cargo handling work is to first loosen the hoisting rope of the sub-jib 50 from the state shown in FIG. While rotating and hanging clockwise, the sub rope 58 is loosened and the jib 30 is rotated in the same direction, and the suspended sub jib 50 is rotated around the shaft 51 by the sling rope of the hook block 61 at the end of the third winch rope 60. Further, it is rotated clockwise to make it horizontal, and then lowered to the ground, and the shaft 51 is pulled out and separated from the top of the jib 30.

Next, to divide the jib 30, as shown in FIG. Hang the sling rope 71 on the top and pull it inward (to the left) using the hook block 61 of the third winch rope 60 to make it horizontal, then retract the telescopic boom 6 and place the sixth jib block 36 on the ground ( Figure 7), pin 3 on the other side
9 and separate it from the top of the fifth jib block 35.

At this time, if the sling rope 71 is hung around the center of gravity of the sixth jib block and the jib plotter 36 is suspended horizontally, the fifth jib block 36 can be suspended without placing the sixth jib block 36 on the ground.
Can be separated from the jib block.

Furthermore, the procedure for dividing the fifth to second jib blocks 35 to 32 is similar to this. First, the pin 39 on one side (outside) of the connection base of each jib block is removed, and then the third winch rope 60 is slinged. After horizontally pulling the block 61 with the rope 71, the other pin 39 is pulled out and separated.

Furthermore, if the center of gravity of the sixth or second jib block 36 to 32 is suspended by a sling rope, each jib block 36 to 32 after one minute can be suspended by the third winch rope by rotating the telescopic boom 6. It can be transported to the appropriate location with it down.

Although not shown in the drawings, the assembly of the jib 30,
Needless to say, the assembly can be divided into five parts in the same manner as the division.

Further, the first jib block 31 with the base bracket 21 is lifted horizontally by any mast using appropriate means and removed from the top portion 11 of the innermost boom 10.

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

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

(2) Since the crane's third winch rope can lift and suspend each jib block, etc., even large jibs can be divided into relatively large small numbers of large jib blocks without having to be subdivided. , it does not require much effort to assemble or separate.

(3) Since the large jib can be divided into a relatively small number of jib blocks, the number of times the jib blocks must be assembled is reduced, and the time required to assemble the large jib blocks can be reduced to a single phase.

(4) Since the jib can be assembled and divided by raising and/or extending the telescopic boom and hoisting and unwinding the third winch rope, a large space is not required when assembling the jib.

Furthermore, when the jib is erected after assembly, the hook block hanging from the sheave at the top of the jib can be tensioned and locked by the third winch rope. , the hook block does not swing unnecessarily, and there is no risk of inadvertently damaging property, buildings, etc. around the movement path of the top of the jib.

In addition, if a guide sheave is provided at the lower front side of the longitudinal direction penetration part of the base bracket, the third winch rope can be operated smoothly.

[Brief explanation of the drawing]

The drawing shows an embodiment of a device suitable for carrying out the method for mounting and dismounting a jib in a crane according to the present invention.
Figures 1, 2, 4, and 5 are side views showing the schematic structure of each jib assembly process using this device, and Figure 3 is a side view of the area around the base of the base bracket, which forms the main part of this device. FIG. 6 is a schematic side view of the assembled state of a crane implementing this device, and FIG. 7 is an explanatory diagram of how the top jib block is divided. 3... Swivel part, 6...
Telescopic boom, 10... Fourth (innermost) boom,
11... Top, 14... Sheave,
20...Mounting member, 21...
・Base bracket, 21A...Penetration part, 2
3...Top, 24...
Sheave, 25... (1st) Mast, 30.
...Jib, 31...First jib block, 32-36...Second to sixth jib block, 37
...Axis, 39...
Pin, 41.46... (2nd, 3rd) mast,
60...Third winch rope.

Claims (3)

[Claims] (1) The base of the first jib block is pivotally attached to the top of the base bracket attached to the top of the innermost boom of the telescopic boom that rises and falls on the swivel platform, and the 3 Using the winch rope, lift the second and lower divided jib blocks of the jib in sequence and attach them to the previous jib block, or sequentially lift the jib blocks of the previous jib from the jib block after the assembled jib. lifting and removing, and each time the rear jib block is installed or the front jib block is removed, the telescopic boom is erected and/or extended by an amount corresponding to the height of the rear or front jib block, or A method for mounting and dismounting a jib in a crane, characterized by lodging and/or reducing the jib. (2) The base is attached to the innermost boom top of the telescopic boom that can be raised and lowered with respect to the rotating part, and the base of the first jib block is pivoted to the top of the base bracket that has a penetration part in the front and rear direction, and The base of the mast is rotatably pivoted around the pivoting part between the base bracket and the first jib block, and a third part for operating the divided jib block, etc. is provided in the longitudinally penetrating part of the base bracket. A jib loading/unloading device for a crane, characterized by a winch rope inserted through and suspended. (3) The jib mounting/detaching device for a crane according to claim 1, wherein a guide sheave for the third winch rope is provided at a lower front side of the penetration portion of the base bracket in the longitudinal direction.