JP2867242B2 - Attachment structure such as jib to the crane's telescopic boom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for attaching a crane to a telescopic boom such as a jib, and more particularly to a telescopic boom for a large crane. Of a head block capable of loading and unloading to the top of the innermost boom, and an attachment portion structure such as a jib to a telescopic boom of a crane capable of alternately mounting working members such as a jib for loading and unloading. Things. 2. Description of the Related Art Conventionally, as a structure for attaching a jib to the top of an innermost boom of a telescopic boom of a crane, a derrick cylinder is mounted on a swivel portion on a vehicle body of the crane. The base of the outermost (first) boom of the telescopic boom (main boom), which is raised and lowered, is axially attached to the base and the telescopic boom is expanded and contracted inside the outermost boom by a hydraulic cylinder or the like. The second, third and fourth (innermost) booms to be operated are sequentially slidably inserted, while the crane wheel is moved to the destination and the outrigger is extended. After being pulled out and installed at a predetermined position, the hook block at the end of the rope that is hung down from the sheave of the head block provided at the top of the innermost boom of the telescopic boom or the innermost boom. Through a jib (sub-boom) top sheave with the base affixed to the head block head The cargo block is operated by a hook block at the end of the sub-loop which is suspended. [0003] Although not shown, Japanese Utility Model Application Laid-Open No.
No. 492 discloses a fifth telescopic boom (main boom).
A base of a strut and a jib (sub-boom) is pivotally mounted on the top of a step (innermost) boom, and an end of a guy rod having a base mounted on the top of the strut and the telescopic boom.
The top of the third stage boom is connected by a strut support rope of a fixed length, and the top of the strut and the top of the jib are connected by a jib guy loop, and A telescopic boom that is capable of loading and unloading by changing the angle of the jib with respect to the innermost boom by expansion and contraction of the third and fourth booms.
A tower crane with a system is described. [0004] However, in the conventional structure for mounting the jib to the crane's telescopic boom described in the above-mentioned 0002, the innermost boot of the telescopic boom is used. The base of the mounting block at the jib base is pivotally mounted on the head block at the top of the head, and the mounting block is provided with a top block via an appropriate number of jib blocks, and is suspended from the sheave provided at the top of the top block. The target cargo handling work is performed by the hook block at the end of the rope. Each time the cargo handling work using the jib is started, the base of the mounting block for the shib is attached to the head block at the top of the innermost boom. After that, the sib block, the top block, etc. are quasi-connected, but each time the cargo handling operation is completed, it is necessary to separate the jib from the head block in a process substantially opposite to the above, and these attaching and detaching operations are troublesome, So At this time, it is not easy to align the center of the telescopic boom with the jib, and especially in the case of a large crane that is frequently used recently, the base of the jib is attached to the head block at the top of the innermost boom. There is a problem that the assembling work requires a high level of skill and a long time. As one of the countermeasures, when a long jib is mounted on the top of the telescopic boom, the telescopic boom is raised, and the jib is moved from the point of attachment of the head block to the top of the innermost boom. When the mounting block is hung and the jib block is to be mounted on the top (in this state, the lowest), the mounting block is too close to the top of the innermost boom due to the horizontal component force based on its own weight, Also, when mounting the jib block on the top of the hanging mounting block, if an external force directed toward the inside of the jib block is carelessly applied, the inside of the mounting block excessively approaches the inside of the top of the innermost boom, In either case, the innermost boom and the mounting block may come into contact with each other, causing damage to the inside of the inner boom and the mounting block. Advanced operation technology There is a problem that it takes a long operation time. A tower crane provided with a telescopic boom described in Japanese Utility Model Laid-Open Publication No. Sho 62-136492 has a strut and a base of a jib at the top of the innermost boom of the telescopic boom. At the same time, the top of the strut and the top of the jib are connected by a jib guy loop, and the end of the guy rod hanging from the top of the strut, the top of the third-stage telescopic boom, and a strap of a predetermined length. Unless the 4th and 5th stage booms are expanded and contracted,
Since the angle of the jib to the telescopic boom cannot be adjusted, it is impossible to apply this jib mounting structure as a mounting structure such as a jib to the top of the innermost boom of a normal crane's telescopic boom. In addition, there is a problem that the mounting structure of the jib base to the beam head is restricted by the beam head. In view of such a conventional example, the present invention has a base of a telescopic boom mounted on a swiveling part of a crane, and the telescopic boom can be raised and lowered by a derrick cylinder.
A head block provided with a sheave and a jib or the like can be alternately mounted on the top of the innermost boom of the telescopic boom so that the jib or the like in a crane free from the above-mentioned problems can be provided. It is intended to provide a mounting structure. According to the present invention, a base of a telescopic boom is pivotally mounted on a swiveling part of a crane, and the telescopic boom is made up and down by a derrick cylinder. A crane that can be mounted alternately with a head block having a sheave at the top of the innermost boom and a jib, etc. At the top of the innermost boom of the telescopic boom, a lower part of one side of a head block having a sheave is pivotally mounted, and the lower part of the other side of the head block is detached to the other side of the top of the innermost boom. The head block is unlocked between the lower side of the other side and the other side of the top of the innermost boom, and the head block is rotated about a shaft attachment section at the lower side of the one side, so that In a state of standing outside and fixed to the top of the inner boom, a sheave is provided on the top of the innermost boom. Are detachably mounted. According to the present invention, which has the above configuration,
By attaching a head block provided with a sheave to the top of the innermost boom of the crane's telescopic boom,
In addition to being able to carry out normal heavy-loading operations by the boom, the telescopic boom is laid down, and the head block at the top of the innermost boom is turned to one side of the top of the innermost boom to form the same top. After attaching to the top of the innermost boom, a base such as a jib is attached to the top of the innermost boom, and thereafter, the telescopic boom is erected to enable the cargo handling operation by the telescopic boom and the jib, and After the operation of cargo handling or the like by the jib or the like is completed, the jib or the like is removed from the top of the innermost boom, and the head block is rotated around a lower portion on one side to be attached to the top of the innermost boom. In order to be able to handle heavy loads. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of a structure for attaching a jib to a telescopic boom of a crane according to the present invention. In the drawing, 1 is a crane car, 2 is a car body, 3 is a revolving portion on the car body 2, 4 is an outrigger, 5 is a derrick cylinder, 6 is a telescopic boom (main boom). Reference numeral 6 denotes a first (outermost) whose base is supported by the revolving portion 3 and is raised and lowered by the derrick cylinder 5.
A boom 7 and a second boom 8 which is sequentially slidably inserted into the inside of the first boom 7 and which is operated to expand and contract by appropriate expansion and contraction driving means such as a hydraulic cylinder and a rope (not shown). 3rd boo
A four-stage telescopic boom is constituted by the boom 9 and the fourth (innermost) boom 10. 11 is the top of the fourth beam 10;
Reference numeral 12 denotes a head block 12, which is a head block 12.
The head block 1 is attached to a shaft 13 via a bracket 12D on one side around the top 11 of the fourth boom 10.
Numeral 2 rotates around the shaft 13 at an upper position (FIG. 1) of the top 11 of the fourth boom 10 and at a right position (FIG. 1) deviating from the upper position, and alternately moves to either side thereof. Arranged and fixed. Reference numeral 14 denotes a (main) seat provided on the head block 12.
It is. Reference numeral 20 denotes a mounting member for a working member such as a jib (sub-boom). Reference numeral 21 denotes a base bracket having a base with a pin 22 as a means for mounting to the top 11 of the fourth boom 10.
23 is a top of the base bracket 21; 24 is a guide sheave provided on the side of the base of the base bracket 21; 25 is a base which is pivoted outside the top 23 of the base bracket 21 (to the right in FIG. 1). First mast wearing 26, first mast 27
5 is a first rope having a required length as a connecting member for connecting the top of the base 5 and the base of the base bracket 21.
The first to the base bracket 21 depends on the length of the
The standing angle α of the mast 25 is regulated. 28 is an auxiliary row
In the extended state of the first rope 27 (FIGS. 1 and 3), the auxiliary rope 28 has a length such that its central portion is suspended from the top 23 of the base bracket 21. . Reference numeral 30 denotes a first jib (first sub-boom) as a working member, 31 denotes a mounting block which also serves as a base of the first jib 30 having a base mounted on a top 23 of the base bracket 21 and 32 denotes a base. A jib block attached and connected to the top of the attachment block 31 by a pin 39 as an attachment member;
Reference numerals 33 to 35 denote the same jib blocks, and reference numeral 36 denotes a top block, which are sequentially pinned to the top of the jib block 32 in the same manner as the former. Reference numeral 40 denotes a second jib, and reference numeral 41 denotes a mounting block at the base of the second jib 40, which is fixed to the top of the top block 36 by a pin 46 so as to be able to undulate. 42, 4
3 is a jib block, 44 is a top block, 47 is a fourth mast, and 48 is a sheave. In some cases, the second jib 40 is configured as a single body. Reference numeral 51 denotes a bracket protruding from the base of the mounting block 31; 52, a bifurcated bracket mounted on the bracket 51 with a shaft 53; 54, a second mast whose base is mounted on the bifurcated bracket 52; Protrusion 57 is a guide sheet
, 58 is the third mast, 59 is the ram, 60 is the guide sheave
Reference numeral 62 denotes a second rope serving as a connecting member at the top of the first mast 25 and the second mast 54. The second rope 62 bends the inner ends of the members 63A and 63B by the connecting member 64. Linked as possible. 66 is the second mast 54 and the third mast 58
The stay 66 is connected to the stay pieces 67A and 67B by a pin 68. 7
Reference numeral 0 denotes a third rope as a connecting member at the top of the third mast 58 and the mounting block 31, and the third rope 70 is a member 7
1A and 71B are refractively connected by a connecting tool 72. Reference numeral 75 denotes the top of the first jib 30 and the third mast 5
8, a first tension loop having a required length, and a first tension loop 75 and a third tension loop 70 connected to the top of the third loop 70.
Thus, the third mast 58, the mounting block 31, and the first
The maximum opening with the jib 30 is regulated. 76 is the first jib 3
A second tension rope 79 for adjusting the undulation angle of the second jib 40 with respect to 0 is a sub-loop whose base is wound and unwound by a winch (not shown) on the crane wheel 1, and the sub-loop 79 is provided. Is fixed to the projection 54B at the top of the second mast 54 via the top of the first mast 25.
4, the first jib 30 through the stay 66 and the third mast 58
Rotates about the support shaft 37, and the undulation angle of the first jib 30 with respect to the telescopic boom 6 is adjusted. 81 is a main rope of the crane 1 and 82 is a hook block at its end. The first rope 27, the second rope 62,
The third rope 70 has an appropriate flexibility. β is the proximity angle between the base bracket 21 and the mounting block 31, and the minimum value of the proximity angle β is the first rope 27 and the second rope 6.
2, the total length of the third rope 70, the stay 66, and the like, and the effective height (length) of the first mast 25, the second mast 55, and the third mast 58. First, after moving the crane vehicle 1 to a target cargo handling location, the outrigger 4 places the vehicle body 2 at a predetermined position. Then, crawl the telescopic boom 6
On the vehicle body of the vehicle 1 and the top 1 of the fourth boom 10
1 on one side (the right side in FIG. 3), the lower part on one side is a bracket 1
The head block 12 having the shaft 13 via the 2D is rotated to the outside (the right side in FIG. 1) of the crest 11 and is raised and fixed. Next, the base of the mounting block 31 and the first
The base of the mast 25 is attached to the top 23 of the base bracket 21 by shafts 37 and 26 (FIG. 3), and the mounting block 31 is mounted.
Bifurcated bracket 5 with shaft 53 attached to base bracket 51
2, the first mast 25 is mounted on the base bracket 21 with the second and third masts 54, 58, etc. mounted thereon (FIG. 3), and the top of the first mast 25 is set. And the base of the base bracket 21 and the projection 55 of the second mast 54 are connected by the members 63A of the first rope 27 and the second rope 62, and the second mast 54 and the third mast 58 are connected. The protrusions 56 and 59 are engaged with the
After the mast 58 is locked to the mounting block 31, a loop rope 93 is hung on the suspended portion 25B of the first mast 25, and the hook block 92 at the end of a rope 91 of another crane (not shown) is used. , Base bracket 21 and mounting block 31
The mounting member 20 is lifted such that the base member 21 is substantially horizontal, and the base of the base bracket 21 is attached to the top 11 of the innermost boom 10 of the telescopic boom 6 that falls down (the left side at the position of the chain line in FIG. 3). ) And attached with pins 22. Next, the base of the base bracket 21 and the first
The top of the mast 25 is connected with the first rope 27,
The central portion of the first rope 27 is supported by a clip 29 of an auxiliary rope 28 suspended from the top portion 23 of the base bracket 21 around the shaft 26 of the first mast 25. In addition, the space between the tops of the first mast 25 and the second mast 54 is the second
It is connected by a rope 62 to limit the maximum opening between the two masts 25 and 54, and the top of the second mast 54 and the third mast 58 is connected by a stay 66 so that the masts 54 and 58 can be connected. Limit the maximum opening of the. Further, the third mast 58 and the top of the mounting block 31 are connected to each other by a third rope 70, and
The maximum opening between the mast 58 and the mounting block 31 is limited. In this embodiment, as described above, the base of the base bracket 21 and the top of the mounting block 31 are connected to the first to third ropes 27 as connecting members of a specified length.
The base bracket 21 and the mounting block 31 are connected to each other via the first to third masts 25, 54, and 58 whose effective heights (lengths) are specified by 62, 70, stays 66, and the like. The minimum value of the proximity angle β is limited. The second mast 54 and the third mast 5
Although not shown, a stay 66 for connecting the top with the second rope 8 has the same structure as the second rope 62 (or the third rope 70).
It may be configured as a fourth rope having a required length. Although not shown, the effective height of the first mast 25 is increased, and the first rope 27 connecting the top of the mast 25 and the base of the base bracket 21 is made longer than in the illustrated example. While the maximum value of the rising angle α of the first mast 25 with respect to the bracket 21 is made larger than that in the illustrated example, the second mast 5
4. The third mast 58, the stay 66, and the third rope 70 are removed, and the end of the outer member 63B of the second rope 62 is removed.
The structure directly connected to the top of the mounting block 31, or the second mast 54 and the stay 66 are removed, and the second rope 6
The structure for connecting the second outer member 63B to the top of the third mast 58, the third mast 58 and the stay 66 are removed, and the inner member 71A of the third rope 70 is connected to the second mast 54.
In such a case, the minimum value of the approach angle β between the base bracket 21 and the mounting block 31 is much smaller than that in the illustrated example, so that the mounting block 31 The working range of the working member such as a jib attached to the work is somewhat limited, but the other actions are almost the same as those in the illustrated example. The top 2 of the base bracket 21
The mounting block 31 attached to the shaft 37 on the shaft 3 can be configured as a base jib block of the first jib 30 as described above, but is not shown, for example, a bucket, an earth drill, a hammer,
It can also be configured as a mounting block having a structure suitable for mounting various working members such as a pick. According to this embodiment, when a work member such as the jib 30 is mounted on the top of the innermost boom 10 of the telescopic boom 6, the mounting block 3 is previously mounted on the top of the base bracket 21.
The first mast 25 of the mounting member 20 on which the base of the mast 1 and the mast 25 are pivotally mounted is raised as shown in FIG.
Is lifted by other suitable means such as a crane or the like, and the base of the base bracket 21 is placed on the innermost part of the telescopic boom that falls down.
The innermost beam 10 is positioned close to the top 11 of the beam 10.
The head block 12 attached to the top is pivotally fixed to the side (upward in FIG. 3), and the base of the bracket 21 is attached to the top 11 with the pins 22 simply and quickly. The base of the mounting block 31 is mounted on the top of the base bracket 21 by a shaft 37, and the base of the base bracket 21 and the top of the mounting block 31 are connected to the ropes 27, 62, 66 of a required length. , 70 via the masts 25, 54, 58, the bases of which are mounted around the shaft 37, so that when the mounting block 31 is folded with respect to the base bracket 21, the minimum value of the proximity angle β between the two is determined. It is possible to prevent the occurrence of damage due to the contact between both during assembly and various operations. Since there is no danger that the inside of the base bracket 21 and the mounting block 31 whose base is attached to the top of the base 37 by the shaft 37 will contact, the base of the base bracket 21 is connected to the innermost bracket.
The telescopic boom 6 attached to the top of the boom 10 is erected, and a jib block or the like is attached to the end of a mounting block 31 which hangs down from the shaft 37 of the base bracket 21 attached to the top of the innermost boom 10. When connecting the working members, there is a possibility that a force for pressing the mounting block 31 toward the base bracket 21 may be exerted, or when various operations are performed by the working member mounted on the top of the mounting block 31, etc. This operation can be performed efficiently without considering the problem of damage caused by the abutment between the base bracket 21 and the mounting block 31. A connecting member 2 of a required length for connecting the top of the mast 25 and the base of the base bracket 21.
7 is flexible, and its central portion is suspended and supported by an auxiliary rope 28 hanging down from around the shaft 26 attachment portion of the mast 25 base. Is located sufficiently close to the base bracket 21 side, the central part of the
Is supported at a predetermined position by the
Excessive slack can be prevented. The present invention has the above-described configuration,
As a result, the following effects can be obtained. (1) Since the head block and the jib can be alternately attached and detached at the top of the innermost boom of the telescopic boom, a head block with a sheave is provided at the top of the innermost boom. In addition to being able to handle large loads by installing a jib or the like on the top of the innermost boom, a jib or the like is mounted on the top instead of the bed block. Operations such as loading and unloading of spans can be performed. (2) Since the head block is removed from the top of the innermost boom of the telescopic boom to the outside and the jib or the like is directly attached to the top of the innermost boom, the innermost boom such as the jib is installed. Unlike the conventional example in which a jib or the like is attached via a head block attached to the top of the innermost boom, the attachment structure to the top of the innermost boom is not affected by the shape of the head block. The mounting configuration can be selected according to the shape of the top of the innermost boom, so that the degree of freedom in mounting the jib on the top of the innermost boom is improved. (3) Since the jib or the like is directly attached to the top of the innermost boom without interposing a bed block, the alignment between the center line of the telescopic boom and the center line of the jib is the innermost. It is easier to install through the head block provided at the top of the boom than the conventional example, and moreover, the innermost boom
A high lift head with little torsion generated on a jib or the like connected to the top of the drum can be configured to be relatively lightweight, and the maximum allowable load for a crane having the same strength and rigidity increases. (4) On one side of the top of the innermost boom of the telescopic boom, the other side of the head block with the lower part on one side is
In addition to performing a heavy load handling operation by detachably locking the other side of the innermost boom top, the locking between the lower part of the other side of the head block and the other side of the innermost boom top is released. The head block is rotated around a shaft attachment portion at a lower portion on one side to stand up and fixed to the outside of the top of the innermost boom, and then a base such as a jib is attached to the top of the innermost boom and the jib or the like is used. When carrying out the cargo handling operation, the sheave of the head block that has been set up has a guide function of a sub-loop such as a jib.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a schematic structure of a main part of an embodiment of a mounting portion structure for a jib or the like in a crane according to the present invention. FIG. 2 is a schematic side view of a crane according to the present invention in a state in which a telescopic boom and a jib of a mounting portion structure such as a jib are erected. FIG. 3 is an explanatory side view showing how to attach the structure of the attachment portion such as a jib to the top of the telescopic boom according to the present invention. [Name of code] 1 ... Crane car 2 ... Body 3 ... Swirl section 4 ... Outrigger 5 ... Derrick cylinder 6 ... Telescopic boom 7 ... First boom 8 and 9 ... Second and third booms 10 Fourth (innermost) boom 11 Top part 12 of fourth boom 10 Head block 12D Bracket 13 Shaft 14 (Main) Sheave 20 mounting member 21 (such as jib) base bracket 23 top 24 guide sheave 25 (first) mast 26 pin 27 (first) b -Connecting member 28 -Auxiliary rope 30-(First) Jib 31 -Installation block 32 -Jib blocks 33, 34, 35 -Jib block 36 -Top block 39 -Pin 40 ... Second jib 41... Mounting blocks 42 and 43... Jib block 44... Top block 47. 4 mast 48 sheave 51 bracket 52 fork bracket 53 shafts 54 and 58 (second and third) masts 55 and 56 boss 57 guide sheave 58 ... Third mast 59 Projector 60 Guide sheave 62 Second ropes 63A, 63B Member 64 Connecting tool 66 Stay (connecting member) 67A, 67B Stay piece 68 Pin 70 (third) rope (connecting member) 71A, 71B Member 72 Connecting tool 75 First tension loop 76 Second tension loop 79 ... sub-loop 81 ... main loop 82 ... hook block 91 ... loop 92 ... hook block 93 ... ring loop

Claims (1)

(57) [Claims] A base of a telescopic boom is pivotally mounted on the swiveling part of the crane, and the telescopic boom is made up and down by a derrick cylinder. A sheave is provided on the top of the innermost boom of the telescopic boom. A structure for attaching a jib to a telescopic boom of a crane, characterized in that a head block and a jib or the like having the above structure can be mounted alternately. 2. The base of the telescopic boom is pivotally attached to the swiveling part of the crane, and the telescopic boom can be raised and lowered by a derrick cylinder. At the top of the innermost boom of the telescopic boom, a seal is provided. A lower part of one side of a head block provided with a head is pivotally mounted, and a lower part of the other side of the head block is detachably locked to the other side of the top of the innermost boom. Release the lock with the other side of the innermost boom top,
A jib provided with a sheave on the top of the innermost boom in a state where it is turned around a shaft attachment portion at one lower side thereof, and stands and is fixed outside the top of the innermost boom. A structure for attaching a crane to a telescopic boom, such as a jib, wherein the crane is detachably mounted.