JPH04246091A - Jib overhanging and housing device of crane - Google Patents

Abstract

PURPOSE:To overhang and enclose a jib easily and efficiently by simple and easy operation near a laid boom without boom motions such as expansion/ contraction and rise of the boom, and a surrounding large space. CONSTITUTION:There is provided a jib moving device C which moves a jib 3 between its housing position and overhanging position, supported with a reference edge part facing a boom reference edge direction. The jib moving device C is constituted from a jib supporting beam 10 which is installed so as to rotate around a vertical shaft and derrick with regard to a crane body, a beam derricking means 15 which derricks the jib supporting beam 10, and a connecting means 17 which detachably connects the jib supporting beam 10 and the jib 3 so as to relatively rotate around the vertical shaft.

Description

[Detailed description of the invention]

[Industrial Field] The present invention relates to a jib extension and storage device for moving a jib between a storage position and an extension position in a crane.

0002

2. Description of the Related Art Various crane jib extension and storage devices have been proposed and put into practice.

For example, in Japanese Patent Publication No. 63-30278, the proximal end of a jib placed on the bottom surface of a boom in a horizontal position is connected to the tip of the boom so as to be rotatable around a horizontal axis, and the jib is A downwardly extending type is shown that swings out approximately 180 degrees forward using a point as a fulcrum.

[0004] Also, in Japanese Patent Publication No. 63-59957, etc.,
The so-called jib twist method is shown, in which one side of the base end of the jib is connected to the tip of the boom, the jib is suspended from this connection point as a fulcrum, then twisted, and then swung forward. has been done.

[0005] Still another method is known that employs a lateral extension method in which the jib is swung approximately 180 degrees from the side to the front from the storage position.

[0006]

[Problems to be Solved by the Invention] However, the conventional jib extension and storage devices have the following problems.

(a) The procedure is complicated and requires a lot of effort, and since the boom must be extended/contracted or raised and lowered, the operator has to go back and forth between the operator's cab and the operating position many times, resulting in poor work efficiency. This is not only bad, but also causes severe physical and mental fatigue for the operator.

(b) Since the procedures and operations are complicated, procedural errors and operational errors are likely to occur, and these errors are likely to cause damage to various parts.

(c) The number of additional structures for the boom and jib increases, resulting in higher costs.

(d) The jib extends around the crane and requires a large space for storage. For this reason, it is difficult to use it in narrow places where there is not enough surrounding space, such as in urban areas or indoors. Therefore, the present invention extends and retracts the jib easily and efficiently through simple and convenient operations near the inverted boom, without requiring boom operations such as extending, retracting, and raising the boom, and without requiring a large surrounding space. It provides a crane jib extension and storage device that can be used for crane jib extension and storage.

[0011]

[Means for Solving the Problems] The present invention includes a crane main body consisting of a lower traveling body and an upper rotating body, a boom attached to the upper rotating body, and a jib, the jib comprising:
In a crane in which the base end is connected to the boom tip and extended over the boom tip, and the base end is stored on the side of the boom with the base end facing toward the boom base, the jib is connected to the boom with the base end connected to the boom tip. The crane is equipped with a jib moving device that supports the crane while facing toward the end and moves it between a retracted position and an extended position, and this jib moving device is attached to the crane body so that it can rotate about a vertical axis and can be raised and lowered. The jib support beam is equipped with a jib support beam, a beam undulation means for raising and lowering the jib support beam, and a connection means for connecting the jib support beam and the jib in a detachable and relatively rotatable manner around a vertical axis. Claim 1).

[0012] According to a second aspect of the invention, in the structure of claim 1, the suspension beam is provided on the lower traveling body of the crane main body.

[0013] According to a third aspect of the invention, in the structure of the first or second aspect, the jib support beam is configured to be extendable and retractable in the length direction.

According to a fourth aspect of the invention, in the configuration of claim 3, a beam expansion/contraction mechanism is provided for expanding and contracting the jib support beam in the length direction.

[0015] According to a fifth aspect of the invention, in the configuration of any one of claims 1 to 4, a beam rotation mechanism for rotating the jib support beam around a vertical axis is provided.

[0016]

[Function] According to this configuration, when the jib is supported by the jib moving device, each action of rotation around the vertical axis of the jib support beam, undulation of the beam, and relative rotation of the jib around the vertical axis with respect to the beam This allows the boom to be moved between the retracted position on the side of the boom and the extended position in front of the boom while keeping the proximal end facing rearward in the extended and retracted orientation.

[0017] That is, the jib can be extended and retracted only by the action of the jib moving device and auxiliary manual operation without using any extension/contraction or raising/lowering operations of the boom.

[0018] Therefore, the procedure and effort are reduced, the operation is simple, all operations can be performed around the boom, and there is no need for the operator to go back and forth between the operator's cab and the operating position many times. This makes it possible to extend and retract the jib efficiently and easily without causing physical or mental fatigue.

Furthermore, since the procedures and operations are simple and all work is done around the boom, there are no mistakes and there is no risk of damage to any part.

Moreover, since the jib is extended and moved in parallel in the same orientation as when it was stored, the space required for extension and storage can be small around the boom. For this reason,
The jib can be easily extended and stored even in confined spaces such as urban areas or indoors.

Furthermore, the jib moving device is the only additional structure required, and there is no need to add many structures to the boom and jib as in conventional devices, resulting in lower costs.

Further, according to the structure of claim 2 in which the jib support beam is provided on the undercarriage, unlike the case where the jib support beam is provided on the boom, the beam can be made large. - Suitable for cranes equipped with heavy jibs.

On the other hand, according to the structure of claim 3, in which the jib support beam is configured to be extendable and retractable in the length direction, the jib can be moved as close as possible to the boom by extending and contracting the jib support beam while rotating. As a result, the space required for extending and storing the jib is smaller.

Further, in the fourth aspect of the present invention, the jib support beam can be automatically expanded and contracted, and in the fifth aspect of the invention, the beam can be rotated automatically, so that the labor burden on the operator is reduced.

[0025]

[Embodiment] An embodiment of the present invention will be explained with reference to the drawings.

First embodiment (see FIGS. 1 to 5) A is a lower traveling body, B is an upper revolving body mounted on this lower traveling body A, and a telescopic boom 1 is movable up and down on this upper revolving body B. is installed on.

1a is the basic boom of this telescopic boom 1;
Reference numeral b denotes the same tip boom, and jib mounting shafts 2, 2 are protruded from both left and right sides of the tip of the tip boom 1b, and two-pronged jib mounting shafts 2, 2 are provided on both sides of the base end of the jib 3 when the jib is extended as shown in Figures 3 and 4. Jib feet 4, 4 having a shape are engaged and connected to the jib mounting shafts 2, 2 on both sides. In FIG. 3, 5 is a suspension rod that supports the jib 3 in an extended state.

When the jib 3 is not in use, it is shown in FIGS. 1 and 2.
As shown in , on the side of the boom 1 (usually the left side as seen from the operator's cab as shown in the figure, below, this case will be explained), both jib feet 4, 4 are oriented toward the base end of the boom, as in the case of extension. Moreover, the jib foot 4 is stored in a horizontal position with the jib feet 4 located on the left and right sides (the entire jib is substantially horizontal).

6, 6 are jib support brackets provided on the left side of the basic boom 1a, and the jib 3 is supported from below by these brackets 6, 6 in the retracted position, and is fixed by a fixing pin (not shown). .

Further, 7 is a revolving frame of the upper revolving structure B that supports the boom 1 so as to be able to raise and lower, 8 is a boom hoisting cylinder, and 9 is a cabin (operator's cab).

The configuration of a jib moving device C for moving the jib 3 between the storage position shown in FIGS. 1 and 2 and the extended position shown in FIGS. 3 and 4 will be described with reference to FIG.

Reference numeral 10 denotes a jib support beam, and cylinder bodies 10a, 10b, 10c, and 10d in multiple stages (in the illustrated example, a total of four stages: a base end, two middle stages, and a tip, which will be explained using this example) are telescope-shaped. It is configured to be telescopic by being fitted into the beam, and is configured to be telescopically operated by a beam telescoping mechanism.

[0033] This beam extension mechanism may have a well-known structure (a combination of a hydraulic cylinder and a rope extension mechanism) as shown in, for example, Japanese Utility Model Application Publication No. 63-151494 as a boom extension mechanism. Here, only the telescopic cylinder 11 as the telescopic drive source is illustrated, and illustration and explanation of the rope telescopic mechanism are omitted.

This jib support beam 10 has a base end (base end of the base end cylinder 10a) attached to a horizontal axis 14 on a support frame 13 provided at the front end of the carrier frame A1 via a beam mount 12. It is rotatably pivoted around the body, that is, can be raised and lowered, and is operated to raise and lower by means of a raising and lowering cylinder (hydraulic cylinder) 15.

The support frame 13 is attached to the beam mount 12 via a bearing 16 so as to be rotatable around the vertical axis X, so that the jib support beam 10 can rotate (swivel) around the vertical axis X. It has become.

Furthermore, a hanging hook 1 is attached to the tip of the jib support beam 10 (the tip of the tip cylinder 10d) as a connecting means.
A hanging rope 17 with 7a is attached.

On the other hand, the jib 3 is provided with a hanging ring 18 on which the above-mentioned hanging hook 17a is hung at the center of gravity.

By the way, a control valve (not shown) for controlling the expansion and contraction of the jib support beam 10 and the expansion and contraction operations of both the undulation cylinders 11 and 15 is provided in the upper revolving structure B, and this control valve is connected to a wireless or wired connection (not shown). Operated by a portable control panel. Thereby, each movement of the jib support beam 10 is performed by remote control around the boom.

Next, the operation will be explained.

When not in use, the jib support beam 10 is stored at the front end of the carrier frame A1 in a fully retracted and horizontal state.

When extending the jib 3 using the jib moving device C, the jib support beam 10 is rotated around the vertical axis X in a slightly raised state by the undulating cylinder 15, and further as shown in FIG. The hanging rope 17 is set at a position above the hanging ring 18 by standing up and extending, and the hanging hook 17a is hooked onto the hanging ring 18.

After that, the jib 3 is released from the jib support brackets 6, 6, the jib support beam 10 is further erected or extended, and the jib 3 is lifted to a higher position than the boom 1, as shown in FIGS. The jib 3 is retracted by rotating the jib support beam 10 from the side (boom 1 side) to the front around the vertical axis X as shown in FIG. position to the extended position.

During this beam rotation, the jib 3 can be stopped by hand or using an appropriate tool to stop rotating around the hanging point of the jib 3 (by twisting and rotating the hanging rope 17 with respect to the hanging ring 18). 3 can be moved to the extended position with the jib feet 4, 4 facing the boom base end direction when stored.

After that, the jib feet 4, 4 on both sides are engaged with the jib mounting shafts 2, 2 on both sides, and are irremovably connected by pins (not shown), and the jib 3 is supported by the suspension rod 5 as shown in FIG. This completes the jib extension work.

[0045] Furthermore, the work of storing the jib 3 can be carried out by completely reversing the procedure for extending the jib 3 above.

As described above, according to the present device, the jib moving device C can be moved without using any extension/contraction or raising/lowering operations of the boom 1.
The jib 3 can be extended and retracted only by the operation and auxiliary operation by the operator.

[0047] Therefore, compared to conventional devices that use a downward jib extension method, a jib twist method, a jib side extension method, etc., the procedure and effort are reduced, and the operation is much simpler. Additionally, there is no longer a need for the operator to go back and forth between the operator's cab and the operating position many times as in the past.

Furthermore, since the jib 3 is moved almost parallel in the same direction between the extended position and the retracted position, the space required for extending and retracting the jib is small around the boom.

Second Embodiment (See FIGS. 6 to 8) In the first embodiment, the case where the jib 3 is stored horizontally on the side of the boom has been described, but in the second embodiment, as shown in FIGS. The present invention is applicable to a crane in which the jib 3 is stored on the side of the boom in a vertical position with the jib feet 4 on both sides positioned above and below.

[0050] In such a crane, the jib 3 is rotated approximately 90 degrees around the jib center line O in the stored position to take a horizontal position, and then the jib 3 is extended.

Therefore, in this second embodiment, as a means for rotating the jib 3 from the vertical position to the horizontal position at the stored position, the center of gravity of the jib 3 is rotated approximately 90° around the jib center line O. A hanging rod 19 is provided on the arc line of the range, and a slide fitting 20 is slidably provided on this hanging rod 19, and this slide fitting 20 is attached to the hanging rope 17.
With the jib 3 suspended at the
The configuration is such that the posture can be changed from the vertical posture shown in FIGS. 6 and 7 to the horizontal posture shown in FIG. 8 by rotating the device.

In FIGS. 7 and 8, reference numerals 21 and 22 indicate attachment members for attaching both ends of the suspension rod 19 to the jib 3.

In this second embodiment, the procedure for extending the jib after changing the attitude is the same as in the first embodiment. Furthermore, the jib 3 is stored in the reverse order to the procedure used when extending it.

Third Embodiment (See FIG. 9) In both the first and second embodiments, the jib 3 is suspended by the jib support beam 10 and moved between the retracted position and the extended position. On the other hand, in the third embodiment, the jib 3 is supported from below by the jib support beam 10 and is moved between the retracted position and the extended position.

In this third embodiment, the configuration other than that the tip end of the jib support beam 10 is connected to the center of gravity of the jib 3 rotatably around the vertical axis Y and rotatably around the horizontal axis 23 is as follows. It may be the same as both the first and second embodiments.

Other Embodiments (1) In each of the above embodiments, the jib support beam 10 was manually rotated around the vertical axis X.
The rotation may be automatically performed using power. As for this rotation mechanism, for example, in FIG. 5, the lower part of the support frame 13 rotatably supported by the beam mount 12 is formed longer than in the case shown in the figure, and a pinion is provided there, and this pinion is connected to a hydraulic cylinder. It is possible to adopt a configuration in which it is rotated by a rack gear driven by.

(2) In each of the above embodiments, the beam 10 is made to extend and contract with the main purpose of moving the jib 3 within as small a space as possible. However, this beam 10 is configured to be non-extendable and has no undulation effect. It is also possible to move the jib 3 only by means of the following.

(3) In both the first and second embodiments, the hanging rope 17 was used as a connecting means for connecting the jib support beam 10 and the jib 3, but instead of this hanging rope 17, the hanging rod was It may be attached so as to be rotatable relative to the tip part around a vertical axis.

[0059]

As described above, according to the present invention, when the jib is supported by the jib moving device, rotation and ups and downs about the vertical axis of the jib support beam, and the relative relationship between the beam and the jib about the vertical axis are controlled. By rotation, the base end can be moved between a retracted position on the side of the boom and an extended position in front of the boom, with the proximal end facing rearward in the extended and retracted orientation.

[0060] That is, the jib can be extended and retracted only by the action of the jib moving device and auxiliary manual operation without using any extension/contraction or raising/lowering operations of the boom. Therefore, there are fewer steps and effort, the operation is simple, all operations can be performed around the boom, and the operator does not have to go back and forth between the operator's cab and the operating position. Jib extension and retraction work can be carried out efficiently and easily without causing physical or mental fatigue.

Furthermore, the procedures and operations are simple, and since all work is done around the boom, there are no mistakes and there is no risk of damage to any part.

Moreover, since the jib is extended and moved in parallel in the same direction as when it was stored, the space required for extension and storage is small around the boom.

In particular, according to the invention of claim 4, by extending and contracting the jib support beam while rotating, the jib can be moved as close as possible to the boom, so the space required for extending and storing the jib is further reduced. I'm done.

[0064] Therefore, the jib can be easily extended and stowed even in narrow locations such as in urban areas or indoors.

Furthermore, the jib moving device is the only additional structure required, and there is no need to add many structures to the boom and jib as in conventional devices, resulting in lower costs.

Furthermore, according to the structure of claim 2 in which the jib support beam is provided on the undercarriage, unlike the case where the jib support beam is provided on the boom, the beam can be made large. It is suitable for cranes equipped with heavy jibs.

On the other hand, in the fourth aspect of the invention, the jib support beam can be automatically expanded and contracted, and in the fifth aspect of the invention, the beam can be rotated automatically, so that the labor burden on the operator is reduced.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a jib stored state showing a first embodiment of the present invention.

FIG. 2 is a side view of the jib in a retracted state.

FIG. 3 is a side view of the jib in an extended state.

FIG. 4 is a plan view of the jib in an extended state.

FIG. 5 is an enlarged sectional view taken along line A--I in FIG. 1;

FIG. 6 is a side view of the jib in a stored state showing a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view taken along the Ro-Ro line in FIG. 6;

FIG. 8 is a cross-sectional view of the jib rotated by approximately 90 degrees from the state of FIG. 7;

FIG. 9 is a side view of the jib in an extended state showing a third embodiment of the present invention.

[Explanation of symbols]

A Undercarriage body A1 Carrier frame 1 of the undercarriage body Boom 2 Jib mounting shaft 3 Jib 4 Jib foot C Jib moving device 10 Jib support beams 10a, 10b, 10c, 10d Cylindrical body 11 constituting the jib support beam Expansion and contraction of the beam extension mechanism Cylinder 12 Beam mounting base 13 Beam support frame 15 Beam hoisting cylinder 16 Bearing for beam rotation 17 Hanging rope 17a as a connecting means Hanging hook 18 Hanging ring 19 Hanging rod 20 Slide fitting

Claims (5)

[Claims] [Claim 1] A crane main body consisting of a lower traveling body and an upper rotating body, a boom attached to the upper rotating body,
In the crane, the jib is provided with a jib, and the jib is extended from the boom tip with its base end connected to the boom tip, and stored on the side of the boom with its base end facing toward the boom base end. , a jib moving device that supports the jib with its base end facing toward the boom base end and moves it between a retracted position and an extended position; A jib support beam rotatably and erectably attached around the jib support beam, a beam undulation means for raising and lowering the jib support beam, and a connecting means for connecting the jib support beam and the jib in a detachable manner and relatively rotatable around a vertical axis. A crane jib extension and storage device characterized by comprising: 2. The crane jib extension and storage device according to claim 1, wherein the suspension beam is provided on the undercarriage of the crane main body. 3. The crane jib extension and storage device according to claim 1, wherein the jib support beam is configured to be extendable and retractable in the length direction. 4. The jib extension and storage device for a crane according to claim 3, further comprising a beam expansion and contraction mechanism that expands and contracts the jib support beam in the length direction. 5. The crane jib extension according to claim 1, further comprising a beam rotation mechanism for rotating the jib support beam around a vertical axis.
storage device.