KR20170097978A - Level luffing crane with horizontal trolley jib - Google Patents

Level luffing crane with horizontal trolley jib Download PDF

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Publication number
KR20170097978A
KR20170097978A KR1020160019758A KR20160019758A KR20170097978A KR 20170097978 A KR20170097978 A KR 20170097978A KR 1020160019758 A KR1020160019758 A KR 1020160019758A KR 20160019758 A KR20160019758 A KR 20160019758A KR 20170097978 A KR20170097978 A KR 20170097978A
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KR
South Korea
Prior art keywords
trolley
jib
derricking
platform
rope
Prior art date
Application number
KR1020160019758A
Other languages
Korean (ko)
Inventor
윤호섭
Original Assignee
윤호섭
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Filing date
Publication date
Application filed by 윤호섭 filed Critical 윤호섭
Priority to KR1020160019758A priority Critical patent/KR20170097978A/en
Publication of KR20170097978A publication Critical patent/KR20170097978A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
    • B66C23/08—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths
    • B66C23/10—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths the paths being substantially horizontal; Level-luffing jib-cranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/06—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements
    • B66C23/08—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths
    • B66C23/10—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths the paths being substantially horizontal; Level-luffing jib-cranes
    • B66C23/12—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes with jibs mounted for jibbing or luffing movements and adapted to move the loads in predetermined paths the paths being substantially horizontal; Level-luffing jib-cranes with means for automatically varying the effective length of the hoisting rope or cable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/03—Cranes with arms or jibs; Multiple cranes
    • B66C2700/0307—Cranes in which it is essential that the load is moving horizontally during the luffing movement of the arm or jib

Abstract

The present invention relates to a level luffing crane having a horizontal trolley jib. The level luffing crane having a horizontal trolley jib comprises: a platform; a derricking jib having one end axially connected to a derricking pivot of the platform and rotating in a vertical direction; a trolley jib having one end axially connected to a trolley pivot of a free end of the derricking jib, rotating relatively with respect to the derricking jib; a derricking winding drum supported by the platform; a derricking winding portion having a derricking robe connecting the derricking winding drum and the derricking jib; a trolley winding drum supported by the platform; a trolley rope connecting the trolley winding drum and the trolley jib; and a trolley winding portion linked with the derricking winding portion to keep the trolley jib horizontal when the derricking jib rotates in a vertical direction. Accordingly, the present invention provides the level luffing crane which is configured such that the relatively long trolley jib for luffing a heavy load in a horizontal direction while maintaining a horizontal state with the relatively short derricking jib is installed, such that the weight of the level luffing crane is remarkably reduced, and the height of the platform can be reduced, thereby reducing manufacturing costs and securing a relatively large operating radius. In addition, the height of the derricking jib is greatly lowered, hereby enabling an operator to work stably without wobbling of a hook at high wind speed.

Description

{LEVEL LUFFING CRANE WITH HORIZONTAL TROLLEY JIB}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a level luffing crane,

(Derricking Jib) and Trolley Jib (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 the problem of the single jib crane, as shown in Fig. 1, a two-stage jib (50, 60) crane or a travel tower crane

(Travel Tower Crane) have been proposed and applied.

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.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a draw-in cranes which are relatively light in weight and have a low working height, a wide working radius and can be safely and inexpensively manufactured .

The above and other objects can be accomplished by the provision of a platform having a platform, a relief jib having one end pivotally connected to a platform pivot and pivotable upward and downward, one end pivotally connected to a trolley pivot at the free end of the relief jib, A trolley hoisting drum supported by the platform, a trolley hoisting drum supported by the platform, and a trolley hoisting drum having a platform hoisting drum and a hoisting rope connecting the hoisting hoisting drum and the hoisting jib, And a horizontal trolley grip having a trolley rope connecting the trolley grip and having a trolley hoisting portion interlocked with the upper portion of the underside of the trolley so that the trolley grip is horizontal when the undershooting jib rotates up and down .

The trolley hoisting drum is characterized in that it is rotated at a constant speed with a predetermined winding diameter different from that of the up-and-down hoisting drum in order to maintain the horizontal always in conjunction with the undulation angle of the undulating jig.

In addition, it is preferable to further include a single rolling unit for interlocking the rolled-up hoisting drum and the trolley hoisting drum.

And, to guide the wire rope connected to the relief jig and the trolley jib, a relief rope guide sheave disposed at an upwardly spaced position from the relief pivot and guiding the relief rope to guide the trolley rope, and a trolley rope guide sheave And a block support frame for supporting the relay sheave block on the platform.

In addition, the trolley jib includes a backstay to which the trolley rope is coupled to extend upward transversely with respect to the longitudinal direction of the wire rope to provide a pulling moment.

The trolley grip preferably has a rigid tension bar interposed between the trolley rope and the backstay to minimize sagging caused by stretching of the pulling wire rope

As described above, according to the present invention, by providing a long trolley jib that keeps a horizontal state on the free end of the undulation jib having a short length, the weight of the draw-in cranes can be largely reduced and the height of the platform can be reduced. Accordingly, it is possible to provide a pull-in cranes which can secure a wide working radius and lower the height of the undulating gibs, thereby enabling stable operation without fluctuation of the hook even at high wind speeds.

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

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

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 includes a cab and a relief top 240. The winding-up hoisting drum 220,

(340), a trolley hoisting drum (320), and the like. 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 vertically rotatably movable. And a trolley jib 300 that is relatively rotatable up and down relative to the undulating jib 200 and is kept horizontal is installed.

The relief hoisting drum 220 installed in the platform 100 is connected to the relief rope 200 connecting the relief jig 200

(Not shown), which is included in the lottery top portion 240 having the trolley hoisting drum 230,

The trolley hoop 320 is connected to the trolley hoisting drum 300,

And is contained in the trolley winding upper portion 340 interlocked with the upper portion 240 so that the trolley jib 300 maintains a horizontal position when the undersurface jib 200 rotates up and down.

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 length of the wye ropes 230 and 330, which perform the pulling or unclamping operation of the relief jib 200 and the trolley jib 300, Are different. The rolled up hoisting drum 220 hoisting the relief jig 200 and the trolley hoisting drum 320 hoisting the trolley jib 300 are interlocked with each other by the same drive unit M to maintain the horizontal position of the trolley jib 300 .

Fig. 4 is a conceptual view of the hoisting jib 200 of the incoming crane and hoisting concept of the wire rope hoisting the trolley jib 300. Fig. As shown in the figure, by the same driving unit M,

In order to always keep the container 300 in a horizontal position,

The length of the trolley rope 230 and the length of the trolley rope 330 hoisting the trolley jib 300 have a constant proportional relation to each other. That is, when the rotation speed is the same, the trolley hoisting 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 diameter (D2) of the trolley hoisting drum 320 from the fastening formula (1) of the trolley rope 330 to the diameter D1 of the hoisting hoisting drum 220 satisfies the following formula (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 have 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 with each other at a predetermined gear ratio, The trolley jib 300 can be kept horizontal relative to the undulation position of the trolley jib 200.

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 undulation pivot 110 to guide the undulating jib 200 and the wire ropes 230 and 330 connected to the trolley jib 300, 230)

(410) and a trolley rope guide sheave (420) for guiding the trolley rope (330).

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.

A hook for gripping a heavy object and moving it up and down is connected to the lower portion of the trolley (TR)

(TR) is connected to the trolley grip 300 by a pulley and moves horizontally. 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 backstay 310, a tension bar of a rigid body extending to the trolley guide sheave 420

(350). 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 section between the trolley guide sheave 420 and the upper end of the back stay 310 is inserted into the ten-

The sagging fluctuation due to the load variation acting on the trolley rope 330 can be reduced and the sagging and horizontal fluctuation of the trolley grip 300 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 (6)

A pull-in cranes, comprising: a platform; a relief jib, one end of which is pivotally connected to a relief pivot of the platform so as to pivot up and down, and one end is pivotally connected to a trolley pivot at a free end of the relief jig, A trolley hoisting drum supported by the platform, a trolley hoisting drum supported by the platform, a trolley hoisting drum supported by the platform, a trolley hoisting drum supported by the platform, And a trolley rope connecting the trolley grip
And a trolley hoisting portion which is interlocked with the upper portion of the lottery so that the trolley jib is kept horizontal when the undulating jig rotates up and down. The method according to claim 1,
Wherein the trolley hoisting drum is rotated at a constant speed with a winding diameter different from that of the rising / falling hoisting drum. The method according to claim 1,
Further comprising a transmission part between the descending hoisting drum and the trolley hoisting drum. 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. 6. The draw-in cranes as claimed in claim 5, wherein the trolley jib has a tension bar interposed between the trolley rope and the back stay.
KR1020160019758A 2016-02-19 2016-02-19 Level luffing crane with horizontal trolley jib KR20170097978A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160019758A KR20170097978A (en) 2016-02-19 2016-02-19 Level luffing crane with horizontal trolley jib

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020160019758A KR20170097978A (en) 2016-02-19 2016-02-19 Level luffing crane with horizontal trolley jib

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KR20170097978A true KR20170097978A (en) 2017-08-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111232844A (en) * 2020-02-27 2020-06-05 武汉港迪电气有限公司 Electric control compensation method for variable-amplitude fixed-height control of movable arm tower crane

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111232844A (en) * 2020-02-27 2020-06-05 武汉港迪电气有限公司 Electric control compensation method for variable-amplitude fixed-height control of movable arm tower crane
CN111232844B (en) * 2020-02-27 2021-08-17 武汉港迪电气有限公司 Electric control compensation method for variable-amplitude fixed-height control of movable arm tower crane

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