JP5606952B2 - Jib crane - Google Patents

Description

The present invention relates to a jib crane. More specifically, the present invention relates to a jib crane that raises and lowers a jib while turning and running on the ground and lifting a heavy object with a winch.
The swivel type of jib crane is used for assembling large structures such as nuclear reactors and harbor facilities, but the cargo handling object may be a super heavy object that reaches several hundred tons to about 1,000 tons. It is a large structure that itself has considerable weight.
Therefore, since it cannot be transported to the installation site as it is, it is transported to the installation site in a disassembled state, assembled, used, and disassembled and removed when the construction is completed.

  There exists patent document 1 as a prior art example of the above large jib cranes. This conventional example has a circular base frame laid with circular rails. The revolving frame is pivotally supported on the revolving axis of the base frame. The revolving frame is provided with winches for jibbing, hoisting, and cargo handling. It is configured to be disassembled into parts. For this reason, it is described that each member can be assembled by disassembling and carrying it into an installation place, assembling, and mounting a base frame.

Japanese Patent Laid-Open No. 7-2489

In the above prior art, the swivel frame is disclosed as a single member. This one-piece structure employs counterweights and hoisting winches, which are considerable heavy objects, main and auxiliary winding cargo winches, and a structure that pivots a jib and hangs a wire rope. Considering that it is difficult to build a space in a small space and that a large force of several hundred tons level acts in a complicated direction, it is considered that it is disadvantageous for maintaining strength unless it is a monolithic structure. I will.
However, even if the entire jib crane is disassembled, there is a problem that it is still difficult to carry in and remove from the installation site if the swivel frame remains large.

  In view of the above circumstances, an object of the present invention is to provide a jib crane that can be easily carried into and removed from an installation site and can be easily assembled for use.

A jib crane according to a first aspect of the present invention is a jibrecoon in which a revolving frame is movably mounted on an operation support, and a crane component is mounted on the revolving frame, the revolving frame being connected to a central frame and both sides thereof. The first frame and the second frame are connected to the central frame by a pin connection mechanism and a stay support mechanism, and the stay support mechanism is A stay connected between a lower surface of the outer end portion of one frame and a lower portion on the first frame side of the central frame and inclined downward from the first frame toward the central frame; and an outer end portion of the second frame this to and a stay that is lower inclined is connected between the lower surface and the second frame side lower portion of the central frame, and the second frame toward the center frame The features.
The jib crane according to a second aspect of the present invention is the jib crane according to the first aspect, wherein the pin coupling mechanism allows the first frame and the second frame to rotate in a vertical plane and restricts the rotation in a horizontal plane to be impossible. It has a pin and is detachable .
A jib crane according to a third aspect of the present invention is the jib crane according to the first or second aspect, wherein the first frame includes a left frame and a right frame that are connectable and separable to each other, and the second frame is also connected to and separated from the left frame and the right frame. It consists of a frame .
A jib crane according to a fourth invention is the jib crane according to the first, second or third invention, wherein the operating support body includes a center tube and an annular base frame disposed around the center tube, and the center frame is the center tube. The first frame and the second frame are rotatably held around the base frame, and each of the first frame and the second frame includes a traveling portion that moves on the base frame .
A jib crane according to a fifth invention is characterized in that, in the fourth invention, a crane jib is installed in the first frame, and a counterweight is installed in the second frame .

According to the first invention, the following effects are obtained.
Since a) rotating frame can be separated into a plurality of parts of the central frame and the first frame and the second frame, it is easy to carry and removal of the installation site, and assembly for use easy because each part is lightweight Can be done.
b) The stay support mechanism restrains the first and second frames from swinging in the vertical plane so that the swing frame does not bend in the vertical plane even when a load is applied during crane work. Sufficiently withstand the load and enable safe crane operation.
c) The load weight composed of the crane portion and the suspended load acting on the first frame and the second frame is supported by the traveling portion and the stay support mechanism, but the stay of the stay support mechanism faces the center frame. Since it is inclined downward, the load weight applied to the stay support mechanism acts as a compressive load. For this reason, it is only necessary to give the stay mainly buckling strength, so that the structure can be light and simple. Further, since the traveling portion on the lower surface of the turning frame can be held so as not to be separated from the base frame, the smoothness of the turning operation is maintained.
According to the second invention, the pin connecting Organization is wearing a detachably, easy to exploded, pin connecting Organization first, and incapable of restraining the rotation in the horizontal plane of the second frame Therefore, no bending occurs at the connecting portion when the turning frame turns .
According to the third aspect of the invention, the first frame and the second frame can also be divided into left and right frames, which can be carried more easily.
According to the fourth aspect of the invention, the load applied to the first frame and the second frame can be directly applied to the base frame via the traveling portion. Therefore, most of the weight of the crane and the suspended load is reduced to the first frame. If it is applied to the second frame, most of the load can be supported by the base frame so that an unnecessary load is not applied to other parts. Moreover, since the 1st frame and the 2nd frame have a traveling part, turning operation | movement can also be performed smoothly.
According to the fifth aspect of the invention, the crane jib on which the suspended load acts is placed on the first frame and the weight is transmitted to the base frame as a vertical load, so that it is easy to support even if the weight is heavy. In addition, since the heavy counterweight of the crane portion is placed on the second frame and the weight is transmitted to the base frame as a vertical load, it is easy to support even if the weight is heavy. And since the total weight which consists of a crane part and a suspended load is divided into 2 and made to share with the 1st frame and the 2nd frame, stability becomes good and it is hard to fall, and a crane capability improves.

It is a side view of the revolving frame in the jib crane concerning a 1st embodiment of the present invention. It is a top view of the turning frame shown in FIG. It is a top view of the turning frame in the jib crane concerning a 2nd embodiment of the present invention. It is a perspective view of the jib crane concerning the present invention. It is a disassembled perspective view of the jib crane of FIG. It is a perspective view of a base frame. It is a side view which shows a turning frame and a base frame. It is explanatory drawing of the upper division | segmentation block of a base frame. It is explanatory drawing of the lower division block of a base frame.

Next, an embodiment of the present invention will be described with reference to the drawings.
(Basic structure)
Based on FIG. 4 and FIG. 5, the basic structure of the jib crane A according to the present invention will be described.
The jib crane A includes a crane part 1 that is an upper structure and an operation support 10 that is a lower structure for supporting the crane part 1 on the ground.

The crane unit 1 is configured by attaching the following crane constituent members to the upper surface of the revolving frame 2.
3 is a jib, and its base is pivotally supported by a swivel frame 2 with a pin so that it can be raised and lowered freely. An auxiliary jib 4 is attached to the tip of the jib 3. Reference numeral 5 denotes a guide mast, and a guide sheave is attached to the upper end of the guide mast. 6 is a hoisting winch, and the jib 3 can be hoisted by unwinding and unwinding a wire rope (raising rope) fed from the winch.

Reference numeral 7 denotes a main winding winch. The main hook 7f suspended from the tip of the jib 3 can be raised and lowered by feeding and unwinding the wire rope (main winding rope) drawn from the winch.
8 is an auxiliary winding winch, and the auxiliary hook 8f suspended from the tip of the jib 3 can be raised and lowered by feeding and unwinding the wire rope (auxiliary winding rope) drawn out from the winch.
9 is a counterweight installed to balance the overturning moment comprising the jib 3 and the suspended load.

Next, the working support 10 will be described with reference to FIG. The operation support 10 includes a swing rail 11 and a base frame 12 to which the swing support 11 is attached. The base frame 12 includes an upper frame 20 and a lower frame 30.
The turning rail 11 is an annular rail, and the traveling wheels of the turning frame 2 travel on the upper surface thereof.

The upper frame 20 of the base frame 12 has a divided structure divided into six in the circumferential direction, and is configured in an annular shape by connecting the six upper divided blocks 21 to each other. The lower frame 30 also has a divided structure divided into six in the circumferential direction, and is configured in an annular shape by connecting the six lower divided blocks 31 to each other.
A center tube 40 is disposed at the center of the base frame 12, a center shaft 41 is erected on the upper end of the center tube 40, and a spherical bearing 42 is fitted on the center shaft 41.

51, 52 and 53 are spokes, which are connected between the center tube 40 and the base frame 12.
An upper spoke 51 is connected between the upper end portion of the central cylinder 40 and the upper end portion of the upper divided block 21. An oblique spoke 52 is connected between the lower end portion of the center tube 40 and the upper end portion of the upper divided block 21. Reference numeral 53 denotes a lower spoke, which is connected between the lower end portion of the center tube 40 and the lower end portion of the lower divided block 31.

  Of the above three spokes, the upper spoke and the diagonal spoke 52 are provided to balance the outer cylinder 40 and the base frame 12 against the external force when a lateral external force is applied to the crane portion. The lower spoke 53 is provided to maintain the positional relationship between the center tube 40 and the base frame 12.

FIG. 7 shows a state in which the revolving frame 2 is placed on the base frame 12.
The swivel frame 2 is constituted by a frame having a three-part structure of a center frame 2A, a first frame 2B, and a second frame 2C. Each frame 2A, 2B, 2C and their connection structure will be described in detail later.
A fitting recess is formed in the central portion of the central frame 2A, and is externally attached to the spherical bearing 42 of the central shaft 41. With this structure, the swivel frame 2 is held in a position where the center of the swivel frame 2 coincides with the center of the base frame 12, and the swivel frame 2 is swiveled while the center of the base frame 12 and the center of the swivel frame 2 coincide. It has become.

  A traveling unit 60 is provided on the lower surfaces of the first frame 2 </ b> B and the second frame 2 </ b> C that are part of the turning frame 2. The traveling unit 60 includes a frame 61 and wheels 62 that are pivotally attached to the frame 61. The wheel 62 includes a driven wheel in addition to a driving wheel. The wheel 62 rolls on the rail 11 (see FIG. 6) installed on the upper surface of the base frame 12. With the rolling of the wheels 62, the turning frame 2 turns on the base frame 12, and the turning operation necessary for the cargo handling work with the crane is performed.

Based on FIG. 8 and FIG. 9, the structure of the base frame 12 will be described.
FIG. 8 shows an upper divided block 21 constituting the upper frame 20.
The upper divided block 21 is configured by arranging a large number of substantially square ribs 22 in the circumferential direction in a side view and joining the bottom plate 25, the side plates 26 and 27, and the top plate 28 to form a box shape.
The rib 22 includes a main rib 23 and a supplementary rib 24. The main rib 23 is formed by side ribs 23a and 23b so that the basic shape is an isosceles triangle. For this reason, the load acting vertically can be distributed to the two side ribs 23a and 23b and transmitted downward. Moreover, since the center part is thinned, it is lightweight.

A supplementary rib 24 is attached to the left side of the main rib 23 in the drawing (that is, the portion inside the base frame 12). The complementary ribs 24 are L-shaped consisting of vertical ribs 24a and horizontal ribs 24b, and are combined with the side ribs 23a of the main ribs 23 to form a right triangle. The central portion of the supplementary rib 24 is also thinned.
The swivel rail 11 is fixed to the top surface of the main rib 23, that is, a position along the top plate 28.
The turning rail 11 is formed by annularly connecting the divided rails divided into six like the base frame 12.

  A mounting bracket 24p is formed at the inner upper end of the auxiliary rib 24, and a pin hole for connecting the upper spoke 51 is formed. Positioning pins 29 project from the bottom surface of the bottom plate 25. A positioning hole into which a positioning pin 39 of the lower divided block 31 described later is fitted is also formed.

FIG. 9 shows a lower divided block 31 constituting the lower frame 30.
The lower divided block 31 is configured by arranging a large number of trapezoidal ribs 32 in the circumferential direction in a side view and joining the bottom plate 35 and the side plate 36 (see FIG. 8) and the side plate 37 and the top plate 38 to form a box shape. .
The rib 32 includes isosceles triangular side ribs 32a and 33b on both the left and right sides, and an upper side 32c and a lower piece 32d that connect the ribs 32b vertically. In addition, the central part is lightened and lightened.

A positioning pin 39 protrudes from the top plate 38. A positioning hole into which the positioning pin 29 of the upper divided block 21 is fitted is also formed.
A mounting bracket 32p is formed at the inner lower end of the inner side rib 32a, and a pin hole for connecting the lower spoke 53 is formed.

The upper divided block 21 is mounted on the upper surface of the lower divided block 31. At this time, the positioning pins 29 of the upper divided block 21 are fitted into the positioning holes of the lower divided block 31, and the positioning pins 39 of the lower divided block 31 are fitted into the positioning holes of the upper divided block 21, and are fitted to each other at fixed positions.
Then, the bottom plate 25 of the upper divided block 21 and the top plate 38 of the lower divided block 31 are firmly coupled by bolts / nuts or the like.

  Further, the plurality of upper divided blocks 21 adjacent in the circumferential direction are coupled to each other using an appropriate connecting bracket and bolts / nuts. The plurality of lower divided blocks 31 are also coupled to each other by the same fastening means. Further, the divided rails are similarly coupled to each other by appropriate fastening means, and the base frame 12 is constrained by the annular structure.

As shown in FIG. 6, the upper and lower blocks 21 and 31 of the present embodiment are both blocks having a circumferential angle of 60 °.
The both ends 21e of the upper block 21 are attached to the center of the lower block 31, and the both ends 31e of the lower block 31 are attached to the center of the upper block 21.

(First embodiment)
Based on FIG. 1 and FIG. 2, the structure of the turning frame 2 according to the first embodiment will be described in detail.
As described above, the revolving frame 2 has a structure separated into the central frame 2A, the first frame 2B, and the second frame 2C.
And the following crane structural member is mounted in each 2A, 2B, 2C.
On the central frame 2A, two main winding winches 7, one auxiliary winding winch 8, and a pulling winch 8e are mounted.
Support brackets 71 are installed on both the left and right sides (upper and lower sides in FIG. 3) on the upper surface of the frame outer end of the first frame 2B. The base of the jib 3 is pivotally supported by pins on the support brackets 71 and guides. One root of the mast 5 is also pivoted with a pin.

Support brackets 72 are installed on both the left and right sides (upper and lower sides in FIG. 3) on the upper surface of the outer end of the second frame 2C, and the other root of the guide mast 5 is pivotally supported by a pin on the support bracket. ing.
A holding bracket 73 is installed on the upper surface of the outermost end portion of the second frame 2C, and a counterweight 9 in which a plurality of weights are stacked is held.

  With the above configuration, the weight of the jib 3 and the suspended load acts on the outer end portion of the first frame 2B, and the weight of the counterweight 9 acts on the outer end portion of the second frame 2C. The heaviest load acts on both ends.

The connection structure of each frame 2A, 2B, 2C is configured as follows.
Both the upper end of the central frame 2A and the inner upper end of the first frame 2B, and the upper end of the central frame 2A and the inner upper end of the second frame 2C are connected to each other by the pin connection mechanism 75. ing.
The pin connection mechanism 75 is configured such that a bracket 76 on the central frame 2A side and a bracket 77 on the first / second frame 2B / 2C side are fitted and a pin 78 is inserted and connected in the horizontal direction.

  The pin coupling mechanism 75 allows the first frame 2B and the second frame 2C to rotate in the vertical plane with respect to the central frame 2A, but can restrain the rotation in the horizontal plane to be impossible. Therefore, when the revolving frame 2 is turned, the connecting portion does not bend in a dogleg shape. Since the pin 78 can be inserted and removed by a known method, it is detachable, and the revolving frame 2 can be easily disassembled into three frames 2A, 2B, 2C and assembled.

Between the lower surface of the outer end portion of the first frame 2B and the lower portion on the first frame 2B side of the central frame 2A, and between the lower surface of the outer end portion of the second frame 2C and the lower portion of the central frame 2A on the second frame 2C side, Both are connected to each other by a stay connecting mechanism 81.
The stay connecting mechanism 81 is configured such that both ends of the stay 82 are coupled to the lower surfaces of the first and second frames 2B and 2C and the lower portion of the central frame 2A by pin connection. The stay 82 includes the first and second frames 2B. , 2C so as to incline downward from the lower surface of the outer end portion toward the center frame 2A. The stays 82 are arranged on the lower surfaces of the first and second frames 2B and 2C so that the two stays are parallel to the width direction. This number is not limited to two and may be three or more.
Moreover, since both ends of the stay 82 are pin-connected, the attachment and detachment is easy by inserting and removing the pin 83.

  In the above-mentioned stay 82, the total load consisting of the weight of the crane part 1 received at the outer ends of the first and second frames 2B and 2C and the weight of the suspended load acts, but this force acts as a compressive force. Since the buckling strength should be mainly given, it can be composed of a light and simple structure such as a pipe.

  In the jib crane A of the present embodiment, the total load including the weight of the crane unit 1 and the suspended load acts on both ends of the first and second frames 2B and 2C, but most of the load is received by the traveling unit 60. Some will be supported by the stay 82. At this time, the stay 82 acts so that the traveling unit 60 is held at a fixed position of the base frame 10 while withstanding the compressive force, so that the smoothness of the turning operation by the traveling unit 60 is maintained.

  With the configuration as described above, in the present embodiment, the revolving frame 2 can be separated into the center frame 2A, the first frame 2B, and the second frame 2C, so that it can be easily carried into and removed from the installation site and is used for use. Easy assembly is possible.

(Second Embodiment)
Based on FIG. 3, the structure of the turning frame 2 according to the second embodiment will be described in detail.
The revolving frame 2 of the second embodiment is configured such that the first frame 2B and the second frame 2C can be further divided into two.
The first frame 2B includes a left frame 2Ba and a right frame 2Bb, and the second frame 2C includes a left frame 2Ca and a right frame 2Cb. The connection of the left and right frames is not particularly limited as long as it can be separated by using a known pin connection mechanism.

The left and right frames 2Ba and 2Bb and the left and right frames 2Ca and 2Cb are connected to the central frame 2A by two or more pin connection mechanisms 75, respectively. Furthermore, each of the left and right frames 2Ba, 2Bb, 2Ca, 2Cb is connected to the central frame 2A by at least two stay connecting mechanisms 81.
The configuration other than the above may be substantially the same as that of the first embodiment.
According to this embodiment, since the turning frame 2 can be separated into five parts, the conveyance becomes easier.

(Other embodiments)
Although 1st, 2nd embodiment was described above, this invention is not limited to said embodiment.
The first and second frames 2 </ b> B and 2 </ b> C may be separable into three or more divisions in addition to the single unit (first embodiment) and the two division type (second embodiment).
The end 21e of the upper divided block 21 may be positioned closer to the end 31e of the lower divided block 31 than the center of the lower divided block 31 rather than the center of the lower divided block 31.
Further, the upper divided block 21 and the lower divided block 31 are not limited to the six-divided structure, but may be three or four divisions smaller than six divisions, or may be seven to ten divisions larger than six divisions.
Furthermore, when dividing | segmenting, you may divide | segment into an equal angle besides dividing | segmenting into an equal angle.
Furthermore, the base frame 12 is not limited to the two-stage structure of the upper frame 20 and the lower frame 30, and may be a laminated structure of three or more stages.

DESCRIPTION OF SYMBOLS 1 Crane part 2 Turning frame 12 Base frame 21 Upper division block 31 Lower division block 2A Center frame 2B 1st frame 2C 2nd frame 51 Upper spoke 52 Diagonal spoke 53 Lower spoke

Claims (5)

A jibrecoon having a swivel frame mounted on a working support so as to be movable, and having crane components mounted on the swivel frame,
The swivel frame comprises a central frame and a first frame and a second frame connected to both sides thereof;
The first frame and the second frame are connected to the central frame by a pin connection mechanism and a stay support mechanism,
The stay support mechanism is connected between a lower surface of the outer end portion of the first frame and a lower portion on the first frame side of the central frame, and stays inclined downward from the first frame toward the central frame;
A stay connected between the lower surface of the outer end portion of the second frame and the lower portion of the central frame on the second frame side and inclined downward from the second frame toward the central frame. A jib crane characterized by that. The pin coupling mechanism includes a pin that allows the first frame and the second frame to rotate in a vertical plane and restricts the rotation in a horizontal plane, and is detachable. A jib crane according to claim 1, wherein The first frame includes a left frame and a right frame that can be connected and separated from each other.
The jib crane according to claim 1 or 2 , wherein the second frame also includes a left frame and a right frame that can be connected and separated from each other . The working support includes a center tube and an annular base frame disposed around the center tube;
The central frame is held so as to be pivotable around the central cylinder,
The jib crane according to claim 1, 2, or 3, wherein the first frame and the second frame are provided with a traveling portion that moves on the base frame on a lower surface thereof . A crane jib is installed on the first frame,
Wherein the second frame, you characterized <br/> that counterweight is installed 請 Motomeko 4 jib crane according.