JPS6113501Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a climbing crane, and in particular, to enable a mast erected on a swing base to be used as a movement guide for an elevating frame, eliminating the need for guide rails. This invention relates to a climbing crane that can reduce the weight and cost of a mast.

BACKGROUND TECHNOLOGY In general, a climbing crane has a structure in which a mast is erected as a lifting support, a swing base is provided along the mast so that it can be raised and lowered, and a jib is attached to the swing base so that it can be raised and lowered. ing.

Problems that the invention aims to solve By the way, the above-mentioned swing base is heavy because it is equipped with a device to drive the swing and a balance weight to maintain balance, and therefore, conventional climbing cranes of this type have low strength. The problem was that the upper mast had to be made larger, which was uneconomical. In particular, when the swing base is raised high, the center of gravity of the crane as a whole becomes high, which is unfavorable from a safety standpoint, and the lifting height is inevitably limited, resulting in poor workability. Furthermore, since the mast was provided with a rail to guide the movement of the swing base, this tended to increase the weight and cost of the mast.

The present invention was devised to effectively solve the problems of conventional climbing cranes. An object of the present invention is to provide a climbing crane that can reduce the weight and cost of the mast, and improve workability and safety.

Means for Solving the Problems In order to achieve the above object, the present invention includes a rotating base rotatably supported on a mount, a mast erected on the rotating base, and a movable structure that can be freely raised and lowered along the mast. A climbing crane comprising a supported elevating frame, a jib provided on the elevating frame so that it can be raised and lowered, and a hoisting device provided on the revolving base and having a hoisting rope, the elevating frame is provided with a mast. A traveling wheel having a track is provided, and a first sheave is provided around which a hoist hoisting rope fed out from the hoisting device is wound around the elevating frame, and a hoisting rope from the first sheave is attached to the top of the mast. A second sheave is provided around which the hoisting rope is wound, and an engaging portion is provided on the elevating frame to engage a hoist of the hoisting rope from the second sheave in order to move the elevating frame up and down.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

In Figures 1 and 2, 1 has its base underground.
A disc-shaped roller path 2 is integrally provided on the upper surface of the pedestal, and this roller path 2
A swing base 4 is placed on the top via rollers 3 arranged in an annular manner. Further, a center post (not shown) is provided upright on the roller path 2, and the swing base is pivotably supported on the roller path 2 by being pivotally supported by the center post. The swing base 4 has a support claw 5 that engages with a flange portion 2a formed on the outer peripheral portion of the upper end of the roller path 2 from the outside in the radial direction, and is prevented from floating or detaching from the roller path 2. A driving gear of a motor attached to the swing base 4 is engaged with a pin rack provided on the roller path 2, so that the swing base 4 is configured to swing on a horizontal plane.

A mast 6 is detachably erected on the front side of the swing base 4 by a pin joint with a pin _P1 , and an elevating frame 7 is supported along the mast 6 so as to be movable up and down. The mast 6 is formed into a vertically elongated frame body with square pillars 8 arranged at its four corners, and is configured as a lifting guide member or a supporting member for the lifting frame 7. In addition, the prismatic members 8 forming the four corners of the mast 6 are specifically hollow prismatic members,
Efforts are being made to reduce weight and increase strength. Further, the mast 6 is divided into sections at appropriate intervals in the longitudinal direction, and the sections are connected to each other with bolts or the like, so that the height thereof can be changed as desired.

On the other hand, the elevating frame 7 includes a guide frame portion 7 formed in a frame shape so as to surround the outer periphery of the mast 6.
a (see FIGS. 3 and 4), and a support frame part 7b integrally extending rearward from this guide frame part 7a, and a mast 6 is attached to the guide frame 7a. Travel wheels 9 are provided for smooth movement along.
As shown in FIGS. 3 and 4, these running wheels 9 are vertically opposed to each other so as to sandwich the four corners of the mast 6, more precisely, the prismatic member 8, from the front and rear directions of the guide frame portion 7a of the elevating frame 7. A total of 8 pieces are installed, 4 pieces each. Next, the specific structure of the running wheels 9 will be explained.

As shown in FIGS. 5 and 6, the running wheel 9 has a horizontal shaft 11 attached to the guide frame portion 7a via a vertical shaft 10, and the central portion of the horizontal shaft 11 is supported by the vertical shaft 10. Eccentric collars 12, 12 at both ends
Brackets 13, 13 are fitted through the brackets 13, 13, and two wheels 14 are rotatably attached to the opposing inner sides of both brackets 13, 13 at vertically symmetrical positions with the horizontal shaft 11 in between. These wheels 14 facing each other along the horizontal axis 11 have a flange 14a on the base side.
, and the opposing flanges 14
By positioning the prismatic member 8 of the mast 6 between a and 14a, movement of the running wheels 9 in the direction of the horizontal axis 12 is restricted. The eccentric collar 12 can be fixed to the bracket 13 with bolts or the like while changing the rotation angle, and thereby the bracket 13 can be adjusted to protrude and retract from the guide frame portion 7a in the direction of the mast 6, and the mast Even if the distance between the square pillars 8 is distorted due to manufacturing accuracy, the wheel 14 can be easily and accurately adjusted at any time to ensure reliable contact with the square pillars 8. In addition, in FIGS. 5 and 6, 15 is the horizontal axis 1
The eccentric collar 12 and the bracket 13 are bolted to this presser plate, which is engaged with an annular groove 16 formed at both ends of the bracket 1, thereby restricting the movement of the bracket 13 in the direction of the horizontal axis 11. There is.

The elevating frame 7 equipped with the running wheels 9 configured in this way is raised and lowered on the mast 4 using a hoisting device (winch W) provided on the revolving base 4, and is pinned to the upper end of the mast 4. Fixed via _P2 . A jib 17 is mounted on the elevating frame 7 so that the base 17a can be removably pivoted with a pin _P3 , and can be raised and lowered freely. A guy support 18 is detachably attached to the jib 9 by a pin _P4, and supports various ropes l such as a rope for hoisting gear and a rope for elevating the jib to guide it to the tip 9b of the jib 9. A sheave block 19 for supporting various ropes l is provided at the top of the guy support 18. In order to raise and lower the lifting frame 7 using the winch W, as shown in FIGS. 7 and 8, a hoist hoisting rope l ₁ suspended from the tip 17b of the jib 17 is wrapped around the lifting frame 7. A first sheave S ₁ is provided at the top of the mast ₆ for winding the rope l ₁ from the first sheave S ₁ . An engaging portion 30 is provided for engaging a hanging tool (not shown) at the tip of the rope l ₁ from the second sheave S ₂ .

Between the rear end of the lifting frame 7 and the rear end of the swing base 4, a jib 1
A tension bar 20 for preventing the lifting frame 7 from tilting or bending due to the load of the pin P ₅ ,
Connected via _P6 . This tension bar 20, like the above-mentioned mast, is divided into sections at appropriate intervals in the longitudinal direction, and the length can be arbitrarily changed by connecting each section with a pin.

A jib mounting portion 21 for removably pivoting the base 17a of the jib 17 is formed on the swing base 4, and a guy support mounting portion for removably mounting the guy support 18. A so-called non-elevating type crane in which the jib 17 and the guy support 18 are directly attached to the swing base 4 with the mast 6 and tension bar 20 removed, and the jib 17 is not raised or lowered. It is configured so that it can be used as a

Next, the operation of the above embodiment will be described.

As mentioned above, when installing the jib 17 and the guy support 18 directly on the swivel base 4 to change the working height of the jib 17 from a non-elevating type to an elevating type in which the working height of the jib 17 can be changed, first After removing the jib 17 and the guy support 18, the elevating frame 7 is installed on the swing base 4. Next, the jib 1 is placed on this lifting frame 7.
7 and guy support 18 are attached, and various ropes l are hung at predetermined places so that it can be used as a crane, and the mast 6 is transported onto the swing base 4 by its own power, and this mast 6 is moved as shown in FIG. It is installed on the swing base 4 in an upright position. When installing it, each running wheel 9 of the lifting frame 7 should be engaged with the square pillar 8 of the mite 6 as shown in FIG. 6, and the gap between the running wheel 9 and the square pillar 8 can be adjusted by the This is done by changing the angle at which the eccentric collar 12 fitted into the bracket 11 is attached to the bracket 13. Next, the jib 17 is pinned to the guy support 18 in an erect state, and in this state, the elevating frame 7 is raised along the top of the mast 6 using a winch W, as shown in FIG. In this case, the rope l ₁ let out from the winch W and suspended from the tip 17b of the jib 17 is first wrapped around the first sheave S ₁ provided on the lifting frame 7, and then the rope Wrap it around the second sheave S ₂ ,
Next, the hanging tool at the end of the rope _l1 is engaged with the engaging part 30 provided on the lifting frame 7. The lifting and lowering operations are performed by winding or unwinding the rope _l1 . Once the elevating frame 7 has moved to the upper end of the mast 6 in this way, it stops rising and fixes the elevating frame 7 to the mast 6 via the pin _P2 , thereby creating the state shown in Fig. 1. This allows work to begin.

In this way, since the lifting frame 7 is installed on the upper end of the mast 6, the required jib 1
A mast 6 having a height corresponding to the working height of 7 is prepared, and the height of the mast 6 is set in advance before installation because it has a split configuration as described above. Note that the rope l ₁ may be wound sequentially from the tip 17b of the jib 17 through the sheave block ₁₉ to the first sheave S 1 and the second sheave S ₂ .

Effects of the invention In summary, the invention provides the following excellent effects.

(1) A mast is erected on a swing base, an elevating frame equipped with a jib is supported along the mast so as to be able to rise and fall freely, and a hoisting device provided on the revolving base is used to raise and lower the elevating frame. As a result, compared to conventional climbing cranes in which the mast supports the swing base or the lifting frame is equipped with a lifting device, the load on the mast is smaller, and the mast can be made with a simpler structure, resulting in lighter weight and lower costs. You can try to bring it down.

(2) In addition, since the mast can function as a movement guide for the lifting frame, the guide rails that were essential to the mast can be eliminated.
This can further help reduce the weight of the mast and make it easier to manufacture.

(3) By reducing the weight of the mast, the center of gravity of the entire crane can be kept low;
Not only is it possible to improve safety with excellent earthquake resistance, but also workability can be improved by making the height of the lift as high as possible.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the climbing crane according to the present invention, and Fig. 2 is a side view of the climbing crane according to the present invention.
3 is an enlarged side view of the main part of the elevating frame, FIG. 4 is a sectional view taken along the - line in FIG. 3, FIG. 5 is an enlarged side view of section A in FIG. 3, and FIG. Figure -
The line sectional view, FIGS. 7 and 8 are action explanatory views. In the figure, 1 is a frame, 4 is a swing base, 6 is a mast, 7 is an elevating frame, 17 is a jib, 9 is a running wheel, 30 is an engaging part, _l1 is a hoisting device hoisting rope, _S1 is a first The sheave, S ₂ is the second sheave, and W is the hoisting device (winch).

Claims (1)

[Scope of utility model registration request] a swivel base rotatably supported on a pedestal;
a mast erected on the revolving base; an elevating frame supported so as to be movable up and down along the mast;
a jib provided on the elevating frame so that it can be raised and lowered;
In the climbing crane, the hoisting device is provided on the swing base and has a rope for hoisting the hoist, and the elevating frame is provided with running wheels having a mast as a track, and the hoisting device is provided on the elevating frame. A first sheave is provided on which the lifting rope hoisted from the first sheave is wound, a second sheave is provided on the top of the mast, and a second sheave is provided on the top of the mast, and the hoisting rope is wound around the hoisting frame. A climbing crane characterized in that an engaging portion is provided for engaging a lifting device of a lifting device hoisting rope from the second sheave for vertical movement.