JPH0812263A - Swing type overhead traveling crane - Google Patents

Abstract

PURPOSE:To make a hung beam horizontally turnable as much as a specified angle for improving operation efficiency and saving human labor and power by journalling a swivel base to the tip of a boom, and providing a plurality of a guide sheaves on both the right, and left sides of the above parts, and winding a hoisting wire around each of guide sheaves. CONSTITUTION:A swivel base 5 is journalled to the tip of a boom 2, and caster type longitudinal through hole type guide sheaves 7a-10b are provided on both the right and left sides of the tip part and of the swivel base 5. On the other hand, a wire length variation absorbing mechanism 11 which absorbs the length variation of a hoisting wire 17 during the rotation of the swivel base 5 is provided below the guide sheaves 9a-10b. The one end of a pair of hoisting wires 17 is fastened to right and left parts near the rear end of the boom 2, and the other end is wound around a hoisting drum 4. In addition, a middle part is hung around each of guide sheaves 9a-10b of the swivel base 5 and each of guide sheaves 7a-8b of a tip part through the tip part of the boom 2, each of guide sheaves 7a-10b, each of sheaves 18a, 18b of the wire length variation absorbing mechanism, and the right and left end sheaves 13a, 13b of a hung beam 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swivel type overhead traveling crane used for building buildings and the like.

[0002]

2. Description of the Related Art Conventionally, a structure as shown in a side view of FIG. 7 and a plan view of FIG. 8 is known as a swing type overhead traveling crane. That is, in the figure, 51 is a rail in the front-rear direction laid on the lower surface of the ceiling, 52 is a traveling platform of an overhead crane that travels by engaging traveling wheel devices 53 on the rail 51,
54 is a turning mechanism 55 on the traveling base 52 and a post portion 56.
The body of an overhead crane supporting and supporting the swivel
7 is a boom integrally and horizontally extended from the machine body 54, 58 is a pair of left and right hoisting drums provided on the machine body 54, and 59 is a rope end connection and attachment provided on a boom 57 near the post portion. A pair of left and right gear jacks, 60 is a horizontally long horizontal swivel beam axially attached to the lower surface of the boom 57 near the tip end by a vertical shaft 61, 62 is a swivel motor for the swivel beam 60, and 63 is a hoist drum 58 on the boom 57. After the sheave and the sheave of the revolving beam 60, the hanging beam 64 immediately below and below
It is a pair of left and right hoisting ropes in which the upper sheave is suspended, passed through the revolving beam 60 and the sheave on the boom 57, and the other end is connected to the drive end of the gear jack 59. The crane moves to the required position by traveling of the traveling platform 52, turns the machine body 54 around the post portion 56 to point the boom 57 in the required direction, and turns the turning beam 60 in a predetermined direction by the turning motor 62. Then, the load is slid on the hook of the suspension beam 64, and the load is lifted and conveyed by driving the hoisting drum 58.

[0003]

However, in the conventional device of this type described above, a large number of guide sheaves are provided symmetrically on the boom 57, and the suspension beam 64 is raised and lowered via the hoisting rope 63. Revolving beam 62 with revolving motor 62
When turning 0, the left and right hoisting ropes 63 intersect with each other and the turning beam 60 turns only ± 60 ° in the horizontal plane (range of arrow 65 in FIG. 8), and the remaining 30 ° is about 30 ° of the crane. If the suspension beam 64 cannot be adjusted by traveling and turning, the blind beam cannot be aligned with the load. Then, at the time of lifting such a load, it is necessary to perform a very dangerous and troublesome work such as manually swinging the hanging beam 64 to sling the load or winding the load to adjust the load. There is a problem that the crane operates with lost time.

The present invention has been proposed in view of the above circumstances, and enables the hanging beam 64 to horizontally swivel by ± 90 °,
It is an object of the present invention to provide a swivel type overhead traveling crane which has improved operation efficiency, labor saving, labor saving, and is safe and economical.

[0005]

To this end, the invention according to claim 1 is supported so as to be capable of traveling and turning along a rail extending in the front-rear direction on the lower surface of the ceiling of the building and having a boom tip portion of ± 90 °. In a crane in which a hoisting beam that can swivel within a range is hoisted by hoisting ropes, a swivel that is pivotally supported on the boom tip and that rotates around a vertical axis, and a swivel Rotatable caster-type vertical through-hole guide sheaves disposed on the left and right sides of the boom tip, respectively, and are wound under the respective guide sheaves on the swivel base when the swivel base rotates. A hoisting rope length fluctuation absorbing mechanism that absorbs fluctuations in the upper rope length, and a common hoisting drum with one end fixed to the left and right parts near the rear end of the boom and the other end attached to the rear part of the boom. Each part is wound and the middle part is the same. After being twisted around the sheaves at the left and right ends of the suspension beam through the sheaves of the hoisting portion, the swivel base, and the sheaves of the hoisting rope length variation absorbing mechanism,
It is characterized in that it has a guide sheave of the swivel base, and two systems of hoisting ropes consisting of a pair of left and right that are wound around the guide sheave at the tip of the boom.

According to a second aspect of the present invention, in the first aspect, the boom is capable of traveling directly along the rail on the lower surface of the ceiling, and instead of being supported so as to be rotatable, the boom is capable of traveling directly along the rail. It is characterized in that it is coaxially inserted in the front-rear direction of a crane machine body which is an upright frame extending in the front-rear direction and rotatably supported, and is mounted so as to be movable in the front-rear direction via a drive means.

According to a third aspect of the present invention, in the first or second aspect of the invention, among the hoisting ropes of the two systems, the left guide sheave of the boom tip portion is wound around the guide sheave of the left rear portion of the swivel base. Rising from the first hoisting rope and the supporting sheave of the left hook of the hoisting rope length variation absorbing mechanism,
The guide sheave on the left front side of the swivel base is vertically separated from the second hoisting rope wound around the guide sheave on the left inner side of the boom tip end in the vertical direction, and the boom tip end and the swivel base are respectively separated. Also on the right side, it is characterized in that the substantially horizontal portions of the first and second hoisting ropes are hung around in the same manner in the vertical direction as appropriate.

According to a fourth aspect of the present invention, in the third aspect, the portion of the first hoisting rope that extends from the left sheave of the hoisting rope length variation absorbing mechanism to the right sheave of the same, and the second hoisting rope. It is characterized in that the right sheave of the mechanism for absorbing the fluctuation of the hoisting rope length and the portion wound around the left sheave of the same mechanism are crossed in an X shape.

[0009]

With this structure, the left and right hoisting rope guide sheaves on the boom and on the swivel base are arranged in a combination of two freely caster-shaped center hole guide-types having different heights. One end of the hoisting rope is passed from the lower left and right guide sheaves on the swivel to the lower guide sheave on the boom, and the other end of the hoisting rope is passed from the higher left and right guide sheaves on the swivel on the boom. The sheave of the suspension beam is hung in the middle part of the hoisting rope by passing it through the high guide sheave, and when the swivel base horizontally turns beyond ± 90 °,
The intersections on both ends of these hoisting ropes are vertically spaced apart from each other and do not interfere with each other, and the hanging beam can be freely horizontally rotated to an angle slightly exceeding ± 90 °. At the same time, as the swivel base swivels, the hoisting rope unwinding from the high and low guide sheaves on the swivel base on the side approaching the hoisting drum goes up through the cross sheave of the hoisting rope length adjustment mechanism. By being fed to the high and low guide sheaves on the swivel on the side away from the drum, the feed lengths of the hoisting ropes on the left and right of the suspension beam are automatically adjusted to prevent swinging and tilting of the suspension beam. In addition, by moving the boom forward and backward on the crane body, it is possible to adjust the reach from the turning center of the crane to the suspension beam, and when aligning the suspension beam with a load near the traveling line of the crane, Positioning operation can be performed quickly by moving forward and backward and moving the crane the shortest distance.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of the present invention will be described. FIG. 1 is an overall side view thereof, FIG. 2 is a plan view taken along the line II--II of FIG. 1, and FIG. 4 is a plan view of FIG. 3, FIG. 5 is a lateral cross-sectional view taken along the line VV of FIG. 4, and FIG. 6 is an overall perspective view showing the hoisting procedure of the hoisting rope of FIG. .

In the above drawings, the same reference numerals as those in FIGS. 7 to 8 indicate the same members as those in the drawings. First, in FIGS. 1 and 2, reference numeral 1 denotes a traveling rail 51 on a ceiling surface and traveling wheels 53. The crane machine body 2, which has its upper end engaged with the swing mechanism 55 on the traveling platform 52 of the overhead crane that travels in unison and is rotatably supported, penetrates the crane body 1 and is supported so as to be able to move forward and backward, and its tip end is Gooseneck horizontal boom, 3 is crane body 1
A drive device 4 which is provided on the boom 2 and moves forward and backward through the boom 2 by engaging a wire or a rack rail 3'which extends in the front-rear direction along the boom 2 is a horizontally long hoisting drum 5 provided on the rear portion of the boom 2. Is a swivel base that is swivel-driven by a swivel motor 6 provided above the boom 2 near the tip thereof. 7a, 7
b, 8a, 8b and 9a, 9b, 10a, 10b are caster-type center-hole type guide sheaves, each of which is free to swivel and is provided on both left and right sides so as to face the boom 2 and the swivel base 5, respectively. Is a hoisting rope length adjusting mechanism provided in the lower part of the swivel base 5 so as to be continuous with the guide sheaves 10a and 10b, 12 is a suspension beam with sheaves 13a and 13b suspended on the swivel base 5, 14a, 14b is a pair of left and right gear cylinders provided at an intermediate position on the boom 3, and 15 and 16 are the guide sheaves 7a, 7b and 8
Sheaves provided in the front part of the lower boom 2 corresponding to a and 8b. Reference numeral 17 denotes one end of the gear cylinders 14a, 1
4b connected to the drive end of the boom 2 and extending toward the front of the boom 2 and passing through the sheave 15 on the boom 2 and the guide sheaves 8a, 8b.
After passing through 0a, 10b and the hoisting rope length adjusting mechanism 11 and being spun around the sheaves 13a, 13b of the suspension beam 12,
Left and right 1 provided so that the other end is wound around the hoisting drum 4 via the guide sheaves 9a, 9b and 7a, 7b and the sheave 16.
It is a pair of hoisting ropes. Fig. 6 shows how to retrieve the hoisting rope 17.
As shown in.

Next, referring to FIGS. 3 to 5, the structure of the tip of the boom will be described. The swivel base 5 is mounted on the horizontal overhanging portion (FIG. 3) at the front end of the boom 2 via the slide bearing 18 and the vertical center line. An outer peripheral gear 19 which is rotatably supported around the outer peripheral portion of the outer peripheral portion is engaged with a drive pinion 20 of the turning drive motor 6 and is rotated. Guide sheave 7a
8b and 9a to 10b are the front end of the boom 2, respectively.
The hoisting rope 17 is hung on the sheave of the tube stand 23 on the tube stand 23 with a center hole, which is rotatably supported coaxially by a support tube 21 erected on the center of the swivel base 5 via a bearing 22. The sheave shafts of the brackets 24 are rotatably supported eccentrically to the upper front and the upper rear, respectively. The guide sheaves 9a to 10b on the swivel base 5 are arranged on one side (right side) of the guide sheave 9b for being wound around a hoisting rope length adjusting mechanism 11 (FIGS. 3 to 5) described later. , 10b are installed at intervals (FIGS. 3 to 4) on the opposite side (left side) of the guide sheave 9
It is larger than the distance between a and 10a by the thickness of one sheave. As shown in FIGS. 4 to 5, the hoisting rope length adjusting mechanism 11 is coaxially adjacent to the sheaves 18a and 18b provided so as to contact the outer peripheries of the guide sheaves 10a and 10b on the center hole vertical centerlines. Sheave 18a ', 18
b ', the sheave 18a' is disposed slightly behind the sheave 18a, and the sheave 18b 'is in the form of two sheaves each disposed slightly forward of the sheave 18b.
The hoisting rope 17 wound around the sheaves 18a and 18b from 0a and 10b is wound around the opposite sheaves 18b 'and 18a' in a crossing shape and lowered to the opposite side of the hanging beam 12. (Figs. 4 to 5). As shown in FIG. 3 (chain line) and FIG. 5 (solid line), the hanging beam 12 is provided with a swivel hook 25 at the center and an inward pair of swingable hooks 26 at both ends, and a portion near both ends. The sheaves 13a and 13b on the left, and the sheave 13a on the left side
Is wound around the hoisting rope 17 descending from the sheave 18a '(FIG. 5) of the hoisting rope length adjusting mechanism 11, and is then wound around the upper guide sheave 9a, and the right sheave 13b is wound around the hoisting rope length. After the hoisting rope 17 descending from the sheave 18b 'on the opposite side of the height adjusting mechanism 11 is hung, the hoisting rope 17 is supported so as to be hung around the upper guide sheave 9a. With the hoisting rope length adjusting mechanism 11 having such a structure, when the swivel base 5 shown in FIG. 4 is swiveled clockwise by 90 ° from the state shown in the drawing, the winding loosened on the guide sheave 9b, 10b side. Guide the sheave 17 to the guide sheave 9a,
The height of the suspension beam 12 is maintained constant and horizontal without being loosened as a whole by automatically pulling the suspension beam 10a.

With such a structure, as shown in FIGS. 1 to 6, when the hoisting drum 4 (FIGS. 1 to 2) is driven in the winding or unwinding direction, a pair of hoisting ropes 17 is formed. One side and the other side are simultaneously wound and unwound by the same amount, respectively, and the suspension beam 12 moves up or down. During the winding or unwinding of the hoisting rope 17, or while the hoisting drum 4 is stopped, if the swivel base 5 is swung 90 ° clockwise by the drive of the motor 6 from the state shown by the solid lines in FIGS. , Guide sheave 9 on swivel base 5
a, 10a forward (FIG. 4), guide sheaves 9b, 10
b is backward, 9a ', 10a', 9 shown by chain lines, respectively
It moves to the position of b ', 10b' (FIG. 4). Guide sheave 8b on boom 2 from moved guide sheave 10b '
In the plan view, the hoisting rope 17 (chain line) extending to the crossover state with the hoisting rope 17 (chain line) extending from the moved guide sheaves 9a ′ and 9b ′ to the guide sheaves 7a and 7b on the boom 2, respectively. At that time, one of the intersecting guide sheaves 1
The hoisting rope 17 extending from 0b ′ to the guide sheave 8b on the boom 2 passes between the low guide sheaves and the other crossing 2
The hoisting rope 17 of the book can move between high guide sheaves without interfering with each other, as shown in FIG. Therefore, as shown in FIG. 4, the guide sheave 10b 'that moves in the clockwise direction has the hoisting rope 17' between the other guide sheaves 10a'-8a in plan view.
When it reaches the position, it comes into contact with the hoisting rope 17 'and causes interference. Therefore, 90 ° that does not come into contact with the hoisting rope 17 '
The suspension beam 12 that swivels together with the swivel base 5 can freely swivel within a range slightly exceeding. Further, at that time, the hoisting rope length adjusting mechanism 11 automatically shifts the hoisting rope 17 from the guide sheaves 9b ', 10b' side to 9a ', 10a' side so that the hoisting beam 12 is shaken and tilted. Can be prevented.
The operation of tilting the suspension beam 12 together with the tilted load can be performed by expanding or contracting one of the gear cylinders 14a and 14b, or by expanding and contracting both of them in reverse. These actions are the same when the swivel base 5 rotates counterclockwise. In this way, the suspension beam 12 can be aligned by freely rotating with respect to the load in 360 °, ie in all directions. In addition, when the hoisting load is unloaded or hoisted, when the boom 2 is moved backward on the crane body 1 by the drive of the forward / backward drive device 3,
The suspension beam 12 can be freely moved to a position immediately below the traveling rail 51 of the crane, and the suspension beam 12 can be turned to perform alignment in any direction.

[0014]

In summary, the present invention relates to a crane provided with a rail laid on the lower surface of a ceiling so as to be able to travel and turn, and to equip a boom with a hoisting beam so that the boom tip can be horizontally rotated. A swivel that is swiveled by a drive device is provided on the tip of the boom, and a pair of swivel caster-shaped center-hole type guide sheaves are provided at left and right positions on the swivel and the nearest boom, respectively. A hoisting rope length adjustment mechanism that automatically adjusts the hoisting rope length below the left and right guide sheaves on the table is provided on the swivel base at the position below the guide sheave, and one end is connected to the boom and the other end is the boom. A suspension beam that is positioned below the swivel base by descending the respective end sides of a pair of left and right hoisting ropes wound on a common hoisting drum at the rear via the two guide sheaves and the hoisting rope length adjusting mechanism. By providing via the left sheave, ± a suspended beam in this type of crane 90
It is possible to horizontally rotate in a range slightly exceeding a degree so that the suspension beams can be loaded in all directions, and the operating efficiency can be improved. Further, by further providing a boom on the crane body capable of traveling and turning so as to move forward and backward through the drive means, it is easy to bring the hanging beam closer to and position the load near the traveling rail of the crane. It has the effect of increasing driving efficiency.

In short, according to the first aspect of the invention, the building is supported so as to be capable of traveling along a rail extending in the front-rear direction on the lower surface of the ceiling of the building and pivotable, and capable of pivoting within ± 90 ° at the tip of the boom. In a crane in which a suspension beam of the above is suspended so as to be able to ascend and descend via hoisting ropes, a swivel that is pivotally supported on the boom tip and rotates around a vertical axis, and the swivel and the boom tip The caster type vertical hole penetrating guide sheaves respectively arranged on the left and right sides of each of the above and the guide sheaves arranged below the respective guide sheaves on the swivel base to increase the hoisting rope length when the swivel base turns. A hoisting rope length fluctuation absorbing mechanism that absorbs fluctuations in length, and one end is fixed to the left and right parts near the rear end of the boom and the other end is wound on a common hoisting drum attached to the rear part of the boom. And the middle part of the boom, After being passed around the sheaves at the left and right ends of the suspension beam via the guide sheaves of the swivel and the sheaves of the hoisting rope length variation absorbing mechanism, they are swung around the guide sheaves of the swivel and the guide sheaves of the boom tip. It is possible to rotate the hanging beam 64 horizontally by ± 90 ° by having two pairs of hoisting ropes, which are left and right, and improve the operation efficiency to save labor, labor, safety and economical. Since a crane is obtained, the present invention is extremely useful in industry.

According to the second aspect of the present invention, in the first aspect, the boom directly travels along the rail on the lower surface of the ceiling instead of being supported so as to be directly traversable and pivotable. The crane machine body, which is a vertically-extending upright frame that is supported rotatably and pivotably, is coaxially inserted in the front-rear direction and is mounted so as to be movable in the front-rear direction via a drive means. The present invention is extremely useful industrially, since the moving distance of the boom in the front-rear direction and the turning radius thereof can be increased in addition to the effect of the above.

According to the third aspect of the present invention, in the first or second aspect of the present invention, among the hoisting ropes of the two systems, from the left guide sheave at the boom tip end to the guide sheave at the left rear end of the swivel base. The first hoisting rope that has been turned up and the supporting sheave of the left hook of the hoisting rope length variation absorbing mechanism stand up from the guide sheave on the left front side of the swivel base to the guide sheave on the left inner side of the boom tip. The separated second hoisting rope is appropriately separated in the vertical direction, and the horizontal portions of the first and second hoisting ropes are vertically moved in the same manner on the right end of the boom tip and the swivel base, respectively. In addition to the effects according to claim 1 and claim 2 by appropriately turning around the direction, the swivel base can be swung within a range slightly exceeding ± 90 ° without causing interference between the hoisting ropes. Rotating type that enables The present invention is extremely useful industrially because it provides an overhead traveling crane.

According to a fourth aspect of the present invention, in the third aspect, a portion of the first hoisting rope, which extends from the left sheave of the hoisting rope length variation absorbing mechanism to the right sheave of the hoisting rope, and the second hoisting rope are provided. By crossing the right sheave of the hoisting rope length variation absorbing mechanism and the portion wound around the left sheave of the hoisting rope in an X-shape, the effect according to claim 3 is obtained, and at the time of turning of the swivel base. Also, the present invention is extremely useful industrially because a swivel type overhead traveling crane capable of raising and lowering the suspension beam while maintaining a horizontal posture is obtained.

[Brief description of drawings]

FIG. 1 is an overall side view showing a swing type overhead traveling crane according to an embodiment of the present invention.

FIG. 2 is a plan view taken along the line II-II of FIG.

FIG. 3 is an enlarged view showing a part III in FIG.

FIG. 4 is a plan view of FIG. 3;

5 is a transverse cross-sectional view taken along the line VV of FIG.

FIG. 6 is an overall perspective view showing how to wind the hoisting rope of FIG. 1.

FIG. 7 is an overall side view showing a conventional swing-type overhead traveling crane.

FIG. 8 is a plan view of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Crane body 2 Boom 3 Forward / backward drive device 3'Rack rail 4 Hoisting drum 5 Revolving base 6 Revolving motor 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b
Caster type center hole type guide sheaves 9a ', 9b', 10a ', 10b' Caster type center hole type guide sheaves at turning positions 11 Hoisting rope length adjusting mechanism 12 Suspended beams 13a, 13b Suspended beam sheaves 14a, 14b Gear cylinders 15 and 16 Sheaves on booms 17 Hoisting ropes 18 Thrust bearings 19 Peripheral gears 20 Drive pinions 21 Support tubes 22 Bearings 23 Tube stands 24 Brackets 25 Swiveling hooks 26 Swiveling hooks 51 Traveling rails 52 Traveling platforms 53 Traveling wheels 55 Turning mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minoru Tanaka 1534-1, Nishi-Nasuno-cho, Nasu-gun, Tochigi Prefecture Minoru No. 1534-1 Technical Research Institute (72) Inventor Hisashi Yamakage Nishi-nasuno-cho, Nasu-gun, Tochigi Prefecture Yochu Construction Co., Ltd. Technical Research Institute No. 1534-1, Yotsukamachi (72) Inventor Takeo Kanagawa 1534-1 Yotsukucho, Nishinasuno-machi, Nasu-gun, Tochigi Prefecture Goyo Construction Co., Ltd. Technical Research Institute (72) Inventor Moriki Fujio 6-31 Minamikannon 6-31, Nishi-ku, Hiroshima City, Hiroshima Prefecture (72) Inventor Hisayuki Nakata 6-31 Minamikannon 4-31, Nishi-ku, Hiroshima City, Hiroshima Prefecture

Claims (4)

[Claims] 1. A suspension beam supported on a lower surface of a building so as to be able to travel along a rail extending in the front-rear direction and swivel, and swingable within a range of ± 90 ° at a boom tip end through a hoisting rope. In a crane that can be lifted up and down,
A swivel that is pivotally supported on the boom tip and rotates around a vertical axis, and swivel caster-type vertical through-hole guide sheaves that are respectively disposed on the left and right sides of the swivel and the boom tip. And a hoisting rope length variation absorbing mechanism which is disposed below each of the guide sheaves on the swivel base and absorbs a variation in the length of the hoisting rope length when the swivel base is rotated, and one end of the boom The other end is fixed to the right and left parts near the rear end part, and the other end is wound around a common hoisting drum attached to the rear part of the boom, and the middle part is the boom tip part, the guide sheave of the swivel base, and the above-mentioned winding part, respectively. After passing through the sheave of the upper rope length fluctuation absorbing mechanism, it is laid around the sheaves at the left and right ends of the suspension beam, and then a pair of left and right systems is laid around the guide sheave of the swivel base and the guide sheave at the end of the boom. A hoist with a hoisting rope Turning type overhead traveling crane which is characterized in. 2. The boom according to claim 1, wherein the boom is directly movably and pivotally supported along a rail on the lower surface of the ceiling, but is directly movably and pivotally supported along the rail. A swivel overhead traveling crane, which is coaxially inserted in the front-rear direction of a crane body which is an upright cubic frame extending in the front-rear direction and is mounted so as to be movable in the front-rear direction via a drive means. 3. The first winding according to claim 1 or 2, wherein the hoisting rope of the two systems is wound around a left guide sheave at the boom tip end portion to a guide sheave at the left rear end of the swivel base. The second winding wound up from the upper sheave and the supporting sheave of the left hook of the hoisting rope length variation absorbing mechanism, and from the guide sheave on the left front part of the swivel base to the guide sheave on the left inner side of the boom tip. The upper rope and the upper rope are appropriately separated from each other in the vertical direction, and the substantially horizontal portions of the first and second hoisting ropes are vertically separated from each other in the same manner on the right side of the boom tip and the swivel base. A swing-type overhead traveling crane characterized by the above. 4. The hoisting rope of the second hoisting rope according to claim 3, wherein a portion of the first hoisting rope is wound from the left sheave of the hoisting rope length variation absorbing mechanism to the right sheave of the same and the second hoisting rope. A swivel overhead traveling crane characterized in that the right side sheave of the long-fluctuation absorbing mechanism and the part of the mechanism that is laid around the left side sheave intersected in an X shape.