KR20150003611U - Level luffing crane with horizontal trolley jib - Google Patents

Abstract

The present invention relates to a level luffing crane, and more particularly to a draw-in crane combining a Derricking Jib and a Trolley Jib. The object of the present invention is to provide a draw-in cranes which are relatively light in weight of the draw-in cranes and can be manufactured safely and inexpensively with a low working height and a wide working radius. The inlet crane according to the present invention comprises a platform, a platform, a relief jib having one end pivotally connected to a relief pivot of the platform so as to be able to pivot upward and downward, one end pivotally connected to a trolley pivot at a free end of the relief jig, A trolley jib capable of rotating up and down relative to each other, a relief hoisting drum supported by the platform, a relief rope having a relief rope connecting the relief hoisting drum and the relief jig, A trolley hoisting drum having a different diameter, a trolley rope connecting the trolley hoisting drum and the trolley jib and having a length different from a length of the hoisting rope, wherein when the hoisting jib rotates upward and downward, the trolley grip is horizontal An upper portion of the trolley winding that is interlocked with the upper portion of the lottery, Wherein the total number of grooves of the trolley hoisting drums is equal to the total number of grooves of the hoisting hoisting drums, and the diameter of the hoisting hoisting drums is equal to the total length of the hoisting ropes And the diameter of the trolley hoisting drum is proportional to the total length of the trolley rope divided by the total number of grooves.

Description

{LEVEL LUFFING CRANE WITH HORIZONTAL TROLLEY JIB}

The present invention relates to a level luffing crane, and more particularly to a draw-in crane combining a Derricking Jib and a Trolley Jib.

An example of a level luffing crane, which is a type of jib crane widely used as a crane installed on a quay wall for unloading or drying a ship, is shown in Fig. As shown in the figure, the draw-in cranes are equipped with a traveling carriage 10 installed on a ground rail, a portal frame 20 on the traveling carriage 10 in a tower form, The swivel pedestal 30 is provided. At the upper end of the swivel base 30, a platform 40 accommodating a machine room, a cab, and the like provided with an undulating device, a hoisting device, and the like is installed.

A lower end of the first undulating jig 50 is axially supported to undulate and revolve in a front portion of the cabin of the platform 40 and a second end The base unit 60 is linked and extended, and the hooks hanging on the refracting portion and the tip end portion are raised and lowered to grasp and move the heavy object. At this time, in the cab of the platform 40, the driver operates the undulation device and the hoisting device to wind the loose wire rope and the hoisting wire rope connected to the undulating gibs 50 and 60 or the hooks, , And the platform 40 is turned on the swivel base 30 if necessary.

Today, vessels are becoming larger and ship length and line width are also increasing. As ship length and line width increase, additional mooring walls need to be added, as well as double-banking (70) vessels. In the case of large ships, the line width is approximately 60 meters. When such large ships are double-moored, the working radius of the crane is more than 120 meters. The height of the loading and unloading crane supporting the loading and unloading work according to the double mooring large vessel 70 is also relatively high. Therefore, the outreach of the incoming crane is greatly increasing, and it is expected to continue to increase in the future.

However, in order to increase the size of the ship and secure the working radius by the double mooring 70 of the large-sized ship, the relief gibs 50 and 60 of the piercing crane take longer time. Since the lifting jibs 50 and 60 of the draw-in cranes are elongated, the weight of the jibs is increased and the elevation height is increased. Therefore, a large rotational angular motion and a large driving force are required, there is a problem.

In addition, when the enlarged drawing cranes work within the minimum working radius, the lifting jibs 50 and 60 must be lifted up to the maximum, so that the hoisting wire rope from the end of the undulating gibs 50 and 60 to the hook becomes long, The shaking becomes more serious, and the shaking of the hook and the unnecessary hoisting and the luffing cause a decrease in the working speed. In addition, as the height (length) of the hoisting wire rope becomes higher, This is happening frequently,

In order to solve such a problem of a single jib crane, a two-stage jib (50, 60) crane and a travel tower crane (B), which are two-stage jibs bendably connected as shown in FIG. 1, . However, these cranes have alleviated the problems of the single jib cranes such as weight, shaking, and hook fluctuation to some extent, but they have not fundamentally solved the problem.

The object of the present invention is to provide a draw-in cranes which are relatively light in weight of the draw-in cranes and can be manufactured safely and inexpensively with a low working height and a wide working radius.

The inlet crane according to the present invention comprises a platform, a platform, a relief jib having one end pivotally connected to a relief pivot of the platform so as to be able to pivot upward and downward, one end pivotally connected to a trolley pivot at a free end of the relief jig, A trolley jib capable of rotating up and down relative to each other, a relief hoisting drum supported by the platform, a relief rope having a relief rope connecting the relief hoisting drum and the relief jig, A trolley hoisting drum having a different diameter, a trolley rope connecting the trolley hoisting drum and the trolley jib and having a length different from a length of the hoisting rope, wherein when the hoisting jib rotates upward and downward, the trolley grip is horizontal An upper portion of the trolley winding that is interlocked with the upper portion of the lottery, Wherein the total number of grooves of the trolley hoisting drums is equal to the total number of grooves of the hoisting hoisting drums, and the diameter of the hoisting hoisting drums is equal to the total length of the hoisting ropes And the diameter of the trolley hoisting drum is proportional to the total length of the trolley rope divided by the total number of grooves.

A relay sheave block disposed at a position spaced upward from the relief pivot and having a relief rope guide sheave for relaying the relief rope and a trolley rope guide sheave for relaying the trolley rope; And a block support frame for supporting the block support frame.

And the trolley jib preferably includes a backstay extending upward in the transverse direction with respect to the longitudinal direction to which the trolley rope is coupled.

The draw-in cranes according to the present invention can be provided with a long trolley jib that keeps the horizontal state at the free end of the short-length relief gibs, thereby greatly reducing the weight of the draw-in cranes and reducing the platform height. Accordingly, a wide work radius can be ensured, and the height of the undulating gibs can be lowered, so that stable work can be performed without fluctuation of the hook even at high wind speeds.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a conventional two-ported cranes with a single underslide jib,
FIG. 2 is a side elevational view of a draw-on crane and a double-moored vessel having a trolley jib held horizontally at a free end of a relief jib according to an embodiment of the present invention,
FIG. 3 is a view showing a horizontal state of the trolley grip according to the undulation of the undulating jib of the drawing crane shown in FIG. 2,
Fig. 4 is a conceptual view showing the wire rope and the wire rope of the undulating jib and the trolley jib,
Fig. 5 is a block diagram showing the configuration of a driving unit and a driving unit for driving the rising-hoisting drum and the trolley hoisting drum.

FIG. 2 is a side view showing a draw-in cranes and a double-moored vessel having a trolley jib 300 held horizontally at the free end of the undulating jib 200 as an embodiment of the present invention. As shown in the drawing, a traveling car 10 installed on the ground and able to move along the inner wall of the quay, and a portal frame 10 secured to the top of the traveling car 10, The portal frame 20 is erected in a tower form and on the upper end of the portal frame 20 is provided a swing platform 30 capable of pivoting around the portal frame 20, Respectively.

The platform 100 is provided with a cabin, a lottery top 240 having a winding hoisting drum 220, and a trolley winding top 340 having a trolley hoisting drum. The platform 100 on which the cabin is located is pivotally connected to an undulating pivot 110 fixed at one end of the undulating jib 200 and is rotatably movable upward and downward and the other end is connected to the free end of the undulating jib 200 The trolley pivots 210 are pivotally connected to the undulating jib 200 so that the trolley jib 300 can rotate relative to the underside jib 200 up and down.

The upper portion of the trolley 240 installed on the platform 100 includes a relief rope 230 connecting the undulating hoisting drum 220 to the underside jib 200. The upper portion 340 of the trolley includes the trolley hoisting drum 320, And a trolley rope (330) connecting the trolley grip (300).

As shown in FIG. 2, the relief jib 200 has to be lifted up and down from time to time to avoid the obstacles on the ship 60 being pending. On the contrary, the trolley jib 300 is relatively moved Always keep level.

In order to keep the trolley jib 300 relatively horizontal with respect to the undulation movement of the relief jib 200, the relief rope 230 and the trolley rope 230, which perform the pulling or unclamping operation of the relief jib 200 and the trolley jib 300, 330 have different lengths. The rolled hoisting drum 220 hoisting the underside jib 200 and the trolley hoisting drum 320 hoisting the trolley jib 300 are interlocked with each other by the same one driving unit M, .

4 is a conceptual view of hoisting rope 230 and trolley rope 330 hoisting hoisting jib 200 and trolley jib 300 of the incoming crane. As shown in the figure, in order to keep the trolley jib 300 always horizontally by the same driving unit M, the length of the undulating rope 230 hoisting the underside jib 200 and the length of the trolley jib 300, The lengths of the ropes 330 must have a constant proportional relation to each other. That is, when the rotating speeds are the same, the trolley-carrying drum 320 rotates at a constant speed with a predetermined winding diameter D2 different from that of the winding-up drum 220.

At this time, the total length of the trolley rope to be wound by the trolley hoisting drum 320 with respect to the winding-up drum 220 is obtained by the following equation (1).

(L1-L2) X n ... ... ... ... ... ... ... ... (One)

here,

L1: the distance between the vertex of the block support frame 430 and the relay sheave block under the maximum working radius

L2: the distance between the vertex of the block support frame 430 and the intermediate sheave block under the minimum working radius

n: the trolley rope 330's assistant

From the equation (1), the diameter D2 of the trolley hoisting drum 320 with respect to the diameter D1 of the hoisting hoisting drum 220 satisfies the following equation (2).

D2 X? X? = (L1-L2) Xn ... ... ... ... ... ... ... ... (2)

here,

ρ: the number of grooves determined by the diameter of the hoisting wire rope

Therefore, the diameter D2 of the trolley hoisting drum 320 can be obtained from the following equation (3) from the equation (2).

D2 = (L1-L2) X n /? X? ... ... ... ... ... ... ... (3)

At this time, the condition that the above equations (1) to (3) are satisfied is that the total number of grooves of the winding-up drum 220 and the total number of grooves of the trolley hoisting drum 320 should be the same.

The diameter D2 of the trolley hoisting drum 320 is made different from the diameter D1 of the winding up drum 220 when the same driving unit M synchronously rotates at the same speed as described above The trolley jib 300 can always be kept horizontal.

However, when the hoisting drums 220 and 320 are the same drum diameters D1 and D2 as the driving sources of the same driving unit M, the hoisting drums 220 and 320 are interlocked at a predetermined gear ratio, It is possible to maintain the horizontal position of the trolley jib 300 relative to the undulation position.

As shown in FIGS. 2 and 3, an A-frame shaped sheave block support frame 430, which is fixed to the platform 100 and has a vertex, is upwardly supported and fixed on the platform 100. A relay sheave block 400 is installed at an upper end vertex of the block support frame 430. The relay sheave block 400 is disposed at a position spaced upward from the relief pivot 110 to guide the relief jib 200 and the wire ropes 230 and 330 connected to the trolley girb 300, And a trolley rope guiding sheave 420 for guiding the trolley rope 330 to relay the rope guiding sheave 410 and the trolley rope guiding sheave 420 are installed.

The trolley jib 300 pivotally connected to the free end of the relief jib 200 includes a backstay 310 extending upward from the trolley pivot 210 and a trolley jib 300 having an end portion of the backstay 310 and a tension bar (350). That is, the predetermined section of the trolley jib 300 can be said to be a rigid triangle composed of the trolley jib 300, the tension bar 350, and the back stay 310.

The hook for gripping the heavy object and moving it up and down is connected to the lower portion of the trolley TR, and the trolley TR is connected to the trolley jib 300 in a pulley- At this time, it is preferable that the trolley jib 300 has a triangular rigid structure in order to minimize striking of the trolley jib 300 according to horizontal movement of the trolley TR.

At the upper end of the back stay 310, a rigid tension bar 350 extending to the trolley guide sheave 420 is installed. The upper end of the backstay 310 is connected to the tension bar 350a extended to the trolley jib 300 and the tension bar 350b extended to the trolley guide sheave 420 connected to the trolley rope 330, .

A part of the interval between the trolley guide sheave 420 and the upper end of the backstay 310 is interposed between the tangential bar 350b of the rigid body to reduce the elongation fluctuation due to the load variation acting on the trolley rope 330, Sag and horizontal variations can be minimized.

10: running car 20: portal frame
30: Turning table 40: Platform
50: Relief Jive 1 60: Relief Jive 2
70: Double mooring vessel
100: platform 110: relief pivot
200: undulating jib 210: trolley pivot
220: lifting hoisting drum 230: relief rope
240: Relief upper part
300: Trolley Zib 310: Backstage
320: Trolley hoisting drum 330: Trolley rope
340: Trolley winding upper part 350: Tension bar
TR: Trolley
D1: undulation winding diameter D2: trolley winding diameter
M: drive unit T:
400: relay sheave block 410: relief rope guide sheave
420: trolley rope guide sheave 430: block support frame

Claims (3)

In the incoming crane,
Platform,
A relief jib having one end pivotally connected to a relief pivot of the platform,
A trolley jig having one end pivotally connected to the trolley pivot at the free end of the undulating jig and relatively rotatable up and down relative to the undulating jig,
A lower portion of the platform having an undulating rope connecting the lower and upper hoisting drums to the lower portion of the platform,
A trolley hoisting drum supported by the platform and having a diameter different from the diameter of the hoisting hoisting drum, a trolley rope connecting the trolley hoisting drum and the trolley jib and having a length different from the length of the hoisting rope, An upper portion of the trolley winding cooperating with the upper portion of the trolley so that the trolley jib is kept horizontal when the upper and lower undulations rotate;
And one identical driving unit for rotating the take-up and worn-up drum and the trolley hoisting drum at the same rotation speed,
Wherein the total number of grooves of the trolley hoisting drum and the total number of grooves of the hoisting hoisting drum are the same,
Wherein the diameter of the up / down hoisting drum is proportional to the total length of the undulation ropes divided by the total number of grooves, and the diameter of the trolley hoisting drum is proportional to the total length of the trolley ropes divided by the total number of grooves. Incoming cranes with trolley jibs. The method according to claim 1,
A relay sheave block disposed at a position spaced upward from the relief pivot and having a relief rope guide sheave for relaying the relief rope and a trolley rope guide sheave for relaying the trolley rope; And a block support frame for supporting the trolley. The method according to claim 1,
Wherein the trolley jib includes a backstay to which the trolley rope is coupled so that the trolley grip extends upward transversely with respect to the longitudinal direction.

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