JP6618806B2 - Crane equipment - Google Patents

Description

  The present invention relates to a crane apparatus.

  Conventionally, the intermediate portion of the wire rope is alternately looped between the lifting sheave on the lifting device side and the fixed sheave on the crane club side, and one end of the wire rope is connected to the one end side of the winding drum. A crane device that fixes to the outer peripheral surface, fixes the other end to the outer peripheral surface on the other end side of the winding drum, winds or unwinds the wire rope by rotating the winding drum, and lifts and lowers the hanging tool. It is known (see, for example, Patent Document 1).

  In such a crane device, that is, a crane device having a single winding drum that winds one wire rope on one drum, a large number of lifting sheaves and fixed sheaves are provided in order to disperse a large suspension load. It is done. Further, an equalizer sheave for balancing the tension of the wire rope on one end side and the wire rope on the other end side is usually provided. In this crane apparatus, the middle fixed sheave corresponds to the equalizer sheave.

Japanese Patent Laid-Open No. 9-12281 (FIG. 8B)

  In order to raise and lower a plurality of elevating sheaves with such a single winding drum, the wire rope must be lengthened, and the drum becomes larger. In order to avoid an increase in size, it is conceivable to wind two wire ropes around one drum. This double winding means that one end of the wire rope is extended from the drum by fixing both ends of one wire rope to the drum adjacently, and one of the wire rope is rotated by rotating the drum. This is a winding method in which the other side of the wire rope is wound in two layers on the side (details will be described later regarding two-strand winding). In the case of such double winding, the problem is where the equalizer sheave is arranged. Moreover, although a drum can be reduced in size by 2 winding, in this case, the inclination angle (inclination angle of the direction which saw the raising / lowering sheave from the drum) of the wire rope sent out from the drum becomes small. Therefore, the wire rope hung around the sheave is likely to interfere with the wire rope hung from the drum to the lifting sheave (details of the two-winding and the interference between the ropes will be described later).

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a crane apparatus capable of preventing the interference of the wire rope while reducing the size.

  In the crane apparatus according to the present invention, one end and the other side of the wire rope are extended by fixing both ends of one wire rope, and the other side of the wire rope is placed on one side of the wire rope by rotating. A double-sided drum that winds or rewinds two layers and lifts and lowers the hanger, a fixed-side shaft fixed to the support portion side that rotatably supports the double-winding drum, and a fixed-side shaft A plurality of fixed sheaves rotatably supported, a lifting shaft fixed to the suspension side, and a plurality of lifting sheaves rotatably supported by the lifting shaft; It is alternately wound around the fixed sheave, is supported rotatably on the lifting side shaft or fixed side shaft, and the tension on one side and the other side of the wire rope is balanced by hanging the middle part of the wire rope. The equalizer is provided for the distance between the wire rope reeved in equalizer, and being smaller than the distance between the hanging around the wire rope to the other sheave located the equalizer coaxially.

  According to such a crane apparatus, since both ends of one wire rope are fixed and the other side of the wire rope is wound on the other side of the wire rope in two layers, two-strand winding is adopted. The drum can be downsized. In addition, because the equalizer is pivotally provided on the lifting side shaft that rotatably supports the lifting sheave or the fixed side shaft that rotatably supports the fixed sheave, the existing shaft can be used, and a new shaft or installation location can be used. Is not required separately, and the apparatus can be miniaturized. Moreover, since the distance between the wire ropes hung on the equalizer is smaller than the distance between the wire ropes hung on other sheaves coaxial with the equalizer, the wire rope hung from the drum to the lifting sheave The distance between the wire rope hung on the equalizer is increased, and the interference of the wire rope can be prevented.

  In this way, as a configuration in which the distance between the wire ropes hung on the equalizer is made smaller than the distance between the wire ropes hung around other sheaves coaxial with the equalizer, specifically, the equalizer Is a sheave type, and there is a configuration in which the diameter of the equalizer sheave is smaller than the diameter of the other sheave coaxially positioned with the equalizer. According to such a configuration, the structure can be greatly simplified.

  ADVANTAGE OF THE INVENTION According to this invention, the crane apparatus which can prevent interference of a wire rope can be provided, aiming at size reduction.

It is a perspective view which shows the crane installation provided with the crane apparatus which concerns on embodiment of this invention from the front side. It is a front view of FIG. It is a left view of FIG. It is a perspective view which shows the main trolley and the auxiliary trolley. It is a right view which shows the main trolley. It is a perspective view which shows the structure of the wire rope of a main trolley. It is a figure for demonstrating the effect | action and effect by an equalizer. It is a figure for demonstrating an effect | action and effect at the time of making an equalizer the same diameter as the raising / lowering sheave located coaxially. It is a partially expanded sectional view of the drum for demonstrating double winding. It is a perspective view which shows the structure of the wire rope of an auxiliary trolley. It is explanatory drawing at the time of using another equalizer.

  Hereinafter, a preferred embodiment of a crane apparatus according to the present invention will be described with reference to the drawings. 1 is a perspective view showing a crane facility provided with a crane apparatus according to an embodiment of the present invention from the front side, FIG. 2 is a front view of FIG. 1, FIG. 3 is a left side view of FIG. FIG. 5 is a right side view showing the main trolley, FIG. 6 is a perspective view showing the configuration of the wire rope of the main trolley, and FIG. FIG. 8 is a diagram for explaining the effect, FIG. 8 is a diagram for explaining the action and effect when the equalizer has the same diameter as the lifting sheave positioned coaxially, and FIG. 9 is a drum for explaining the double winding. FIG.

  As shown in FIG. 1, the crane facility 100 is employed in a dock at a shipyard, and includes a crane device for raising and lowering various lifting objects. Here, the crane apparatus is the bridge-type crane 1, for example, a gantry crane or a Goliath crane. Rails 6 and 7 for running the bridge crane 1 are laid along the foundation parts 4 and 5 on the foundation parts 4 and 5 with the dock 3 interposed therebetween. These rails 6 and 7 are tracks for running the bridge crane 1. In addition, although the dock 3 arrange | positions the ship under construction or inspection and maintenance, for example, the bridge crane 1 of this embodiment is applicable also to a harbor etc. when there is no dock 3.

  As shown in FIGS. 1 to 3, the bridge crane 1 includes a pair of leg portions 8 and 9 disposed on the foundation portions 4 and 5, and a girder spanned between the pair of leg portions 8 and 9. 10, and a main trolley 11 and a supplementary trolley 12 that are movable along the girder 10. In the following description, the direction in which the rails 6 and 7 extend and the direction in which the bridge crane 1 travels is referred to as the front-rear direction, and the girder 10 extends in the front-rear direction and intersects with the trolleys 11 and 12. The direction that is the traversing direction is called the left-right direction.

  The pair of leg portions 8 and 9 are provided corresponding to the rails 6 and 7, respectively, and have different rigidity. The leg portion 8 functions as a rigid leg having higher rigidity than the leg portion 9, and the leg portion 9 functions as a swinging leg having lower rigidity than the leg portion 8.

  Traveling devices 13 for traveling along the rails 6 and 7 are provided at the lower ends of the leg portions 8 and 9, respectively. Two traveling devices 13 are provided at the front and rear of the leg portions 8 and 9, and one traveling device 13 has, for example, 16 wheels. The quantities of the traveling device 13 and the wheels are not particularly limited, and other quantities may be used. And when the traveling device 13 moves on the rails 6 and 7, the bridge crane 1 can travel in the front-rear direction.

  The girder 10 is a double box type in which the beams 10a and 10b (see FIG. 4) extending in the left-right direction are arranged in parallel in the front-rear direction and the left and right end portions are connected by connecting portions 10c, 10d. It is girder.

  As shown in FIGS. 1 and 4, main trolley rails 16 are provided on the outer edges in the front-rear direction of the upper end surfaces of the beams 10 a and 10 b of the girder 10, respectively. A supplementary trolley rail 17 is provided on each inner edge. The main trolley rail 16 is a track for traversing the main trolley 11, and the auxiliary trolley rail 17 is a track for traversing the auxiliary trolley 12.

  The main trolley 11 is for raising and lowering an object to be lifted such as cargo. As shown in FIGS. 1 and 3 to 5, the main trolley 11 has a bridge shape in the left-right direction and extends in the front-rear direction. 4 and FIG. 5, and a pair of leg portions 21, 21 projecting downward from both ends in the front-rear direction of the support base 20. The support table 20 is disposed above the top surface 10e of the girder 10, and a space is formed between the support table 20 and the top surface 10e of the girder 10 so that the auxiliary trolley 12 can traverse in the left-right direction. The A traverse device 23 provided with a plurality of wheels is provided at the lower end of the leg portion 21, and the main trolley 11 can traverse in the left-right direction when the traverse device 23 moves on the main trolley rail 16. ing.

  As shown in FIGS. 1 to 3, a cab 31 is connected to the main trolley 11 via a passage portion 30. The cab 31 is a room where the driver performs all operations of the crane operation including the trolley operation and the like, and is positioned below the lower surface of the girder 10 so that the crane operation can be easily performed. Note that the cab 31 may not be connected to the main trolley 11, and may be attached to the lower surface of the end of the girder 10, for example. In FIG. 5, the passage portion 30 and the cab 31 are not drawn in order to avoid the drawing from becoming complicated.

  The auxiliary trolley 12 is for lifting and lowering an object to be lifted alone or in cooperation with the main trolley 11, and as shown in FIG. A pair of leg portions 25, 25 projecting shortly from both ends downward. A traverse device 23 similar to the main trolley 11 is provided at the lower end portion of the leg portion 25, and the traversing device 23 can traverse in the left-right direction by moving on the auxiliary trolley rail 17. 11 can pass under.

  As shown in FIG. 1 to FIG. 5, on a support base 20 of the main trolley 11, winding or winding of a wire rope used for lifting and lowering an object to be lifted by rotating forward and backward by driving a drive source. Two double-winding drums 50 for returning are arranged in parallel in the front-rear direction. As shown in FIGS. 6 and 9, the double-winding drum 50 is wound on the lower layer on one side of the wire rope 60 by fixing both ends of one wire rope 60 to the drum adjacent to each other. The lower layer side wire rope 60a and the upper layer side wire rope 60b wound around the upper layer on the other side of the wire rope 60 are extended (derived) from the drum, and the drum is rotated forward (rotation in one direction). Two windings are performed in which the other side 60b of the wire rope 60 is wound in two layers on one side 60a of the wire rope 60, and the two windings are rewound by reversing the drum. And the hanging tool 90 (refer FIG. 5) raises / lowers according to winding or unwinding of this wire rope 60 (it mentions later in detail).

  As shown in FIG. 6, the portions on both sides sandwiching the center in the axial direction of the double winding drum 50 are areas for performing two windings, and the wire rope 60 is wound around both areas. Rope grooves 50a and 50b for taking are formed in a spiral shape. As shown in FIG. 9, the rope grooves 50 a and 50 b are for guiding (accommodating and engaging) the wire rope 60 a which is one side of the wire rope 60 and which is the lower layer side. And the wire rope 60b which becomes the other side and the upper layer side of the wire rope 60 is wound around between the adjacent wire ropes 60a and 60a of the lower layer side.

  In FIG. 9, white wire ropes 60 x and 60 z that are not hatched are wound around the two-winding drum 50 a plurality of times at the start end side of one side 60 a and the other side 60 b of the wire rope 60. This is the portion secured to the winding drum 50. The one side 60a and the other side 60b of the wire rope 60 to which hatching is applied are the wire ropes at the rope exit position (position where the rope comes out from the drum; position where the rope extends from the drum) at the lower limit of the wire rope head. Show. When the winding of the wire rope 60 (60a, 60b) is started from this state, the one side 60a and the other side 60b of the wire rope 60 are wound from the right side to the left side as shown in the phantom line. Go.

  As shown in FIG. 6, the rope groove 50a on one side of the double winding drum 50 is, for example, a right spiral (right screw), and the rope groove 50b on the other side (opposite side) is, for example, a left spiral (left screw). ). When the two-winding drum 50 is rotated forward and the wire rope 60 is wound around the rope grooves 50a and 50b, the positions of the wire ropes 60 in the regions on both sides approach each other. When the two-winding drum 50 is reversed and the wire rope 60 is rewound, the positions of the wire ropes 60 in the regions on both sides are separated from each other (and vice versa). Here, in the front two-winding drum 50 and the upper two-rolling drum 50, the respective spirals at positions facing in the front-rear direction are reverse spirals.

  Next, a plurality of types of sheaves around which such wire rope 60 is wound will be described.

  As shown in FIGS. 5 and 6, float sheaves 51 a and 51 b are provided on the outer side in the front-rear direction of the pair of legs 21 and 21 of the main trolley 11 so as to project outward. These float sheaves 51a and 51b are respectively provided corresponding to two windings in the region on one side of the drum. The float sheaves 51a and 51b are rotatably supported by a shaft 51x that is arranged from the inner side to the outer side in the left-right direction and extends in a direction (left-right direction) parallel to the axis of the double winding drum 50. Accordingly, a total of four float sheaves 51a and 51b are arranged in a line in the left-right direction. One side 60a of the wire rope 60 from the two-winding drum 50 is wound around the float sheave 51a on the inner side in the left-right direction, and the one side 60a of the wire rope 60 from the two-winding drum 50 is wound around the float sheave 51b on the outer side in the left-right direction. The other side 60b is wound around. These float sheaves 51a and 51b move so as to slide sideways while being guided by the shaft 51x in accordance with the winding or unwinding of the wire rope 60 by the double winding drum 50, and one side 60a and the other side of the wire rope. 60b is guided respectively. The subsequent routing path on the one side 60a of the wire rope 60 and the subsequent routing path on the other side 60b of the wire rope 60 will be described later.

  On the outer side in the front-rear direction of the pair of legs 21, 21 of the main trolley 11, a fixed side shaft 53 x is fixed so as to extend in the left-right direction at a position below the float sheaves 51 a, 51 b and closer to the legs 21, 21. ing. The fixed sheaves 53a and 53b are rotatably supported by the fixed side shaft 53x from the inner side to the outer side in the left-right direction. These fixed sheaves 53a and 53b are respectively provided corresponding to the two windings in the region on one side of the drum. Accordingly, a total of four fixed sheaves 53a, 53b are arranged in a line in the left-right direction.

  On the hanging tool 90 side, an elevating side shaft 52x is fixed to the upper side so as to extend in the left-right direction. And the elevating sheaves 52a, 52b, 52c are rotatably supported by the elevating side shaft 52x from the inner side to the outer side in the left-right direction. These elevating sheaves 52a, 52b, and 52c are respectively provided corresponding to the two windings in the region on one side of the drum. Therefore, the hanging tool 90 is suspended by the six lifting sheaves 52a, 52b, 52c arranged in a line in the left-right direction.

  Next, the routing route of the wire rope 60 from the float sheaves 51a and 51b will be described. For convenience of explanation, the front two-winding drum 50 will be described here.

  As shown in FIG. 6, one side 60a of the wire rope 60 from the inner float sheave 51a is alternately wound around the lifting sheaves 52a to 52c and the fixed sheaves 53a and 53b. Specifically, one side 60a of the wire rope 60 is hung from the front side to the lower side of the inner lifting sheave 52a and comes out from the rear side, and is hung from the rear side to the upper side of the inner fixed sheave 53a. It goes out from the front side, hangs from the front side to the lower side of the outer elevating sheave 52c and goes out from the rear side, hangs from the front side to the upper side of the outer fixed sheave 53b, and goes out from the rear side. It is hung from the rear side to the lower side of the lifting sheave 52b and comes out from the front side, and becomes a winding path from the other side 60b of the wire rope 60 to the double winding drum 50 through the outer float sheave 51b.

  In FIG. 6, the float sheaves 51a and 51b and the fixed sheaves 53a and 53b appear to be considerably separated in the front-rear direction, but in actuality, as shown in FIG. Has been.

  As shown in FIG. 5, both ends of a suspension beam 91 (see also FIGS. 1 to 3) elongated in the front-rear direction are connected to both the front and rear suspension tools 90, 90. The lifting object can be moved up and down by connecting the lifting object.

  Here, in the routing route of the wire rope 60 shown in FIG. 6, the one side 60 a and the other side 60 b of the wire rope 60 are formed by the outer lifting sheave 52 c being wound around the intermediate portion of the wire rope 60. It functions as an equalizer sheave 52c for balancing the tension.

  And in this embodiment especially, as shown in FIGS. 5-7, the diameter of the equalizer sheave 52c is smaller than the diameter of the other raising / lowering sheaves 52a and 52b located coaxially with the equalizer sheave 52c.

  Here, as described above, since the float sheaves 51a and 51b and the fixed sheaves 53a and 53b are arranged close to each other in the front-rear direction as shown in FIG. 5, the equalizer sheave 52c is connected to the equalizer sheave 52c. When the equalizer sheave (elevating sheave) 52d shown in FIG. 8 having the same diameter as the other coaxial elevating sheaves 52a and 52b is used, the wire rope 60r and the wire rope 60s (see FIG. 6) may contact and interfere with each other. is there. That is, in this case, as shown in FIG. 6, a wire rope that hangs around an elevating sheave 52 (each elevating sheave is collectively referred to as an elevating sheave 52) from the double-winding drum 50, in this case, two-winding A wire rope (wire rope 60r in FIGS. 6 to 8) hung from the drum 50 through the outer float sheave 51b to the middle elevating sheave 52b, and an equalizer sheave 52d having the same diameter as the other elevating sheaves 52a and 52b (FIG. 8), and the distance between the wire rope 60t shown in FIG. 8 that is hung on the equalizer sheave 52d and the inner fixed sheave 53a is short, for example, the fluctuation of wind or suspended load, etc. When the wire rope swings, the wire ropes around the range Y indicated by the dotted line in FIG. r and the wire rope 60t there is a possibility contact and interfere with each other.

  However, in this embodiment, as shown in FIGS. 6 and 7, the diameter of the equalizer sheave 52c is made smaller than the diameters of the other lifting sheaves 52a and 52b that are coaxial with the equalizer sheave 52c. . Therefore, as shown in FIG. 7, the distance D1 between the wire ropes hung on the equalizer sheave 52c is between the wire ropes hung on the other lift sheaves 52a and 52b coaxially with the equalizer sheave 52c. It becomes smaller than the distance D2. As a result, between the wire rope 60r that hangs around the lifting sheave 52b from the double winding drum 50 and the wire rope 60s that hangs around the equalizer sheave 52c (wire rope hung between the equalizer sheave 52c and the inner fixed sheave 53a) 60s. And the interference between the wire rope 60r and the wire rope 60s can be prevented.

  In this embodiment, the equalizer sheave 52c having a diameter smaller than the diameter of the other lifting sheaves 52a and 52b positioned coaxially is used as the equalizer, so that the configuration is very simple.

  FIG. 10 is a perspective view showing the configuration of the wire rope of the auxiliary trolley. In the auxiliary trolley 12 shown in FIGS. 1 to 4, the double-winding drum 50 similar to the double-winding drum 50 at the front and rear of the main trolley 11 is provided on the support 24 (see FIG. 4). It is mounted at one place in the center of In this auxiliary trolley 12, there are no float sheaves 51a, 51b and shaft 51x, and the wire rope 60 (60a, 60b) from the double winding drum 50 hangs down through the opening of the support base 24, as shown in FIG. In addition, it is configured to be hung directly on the lifting sheaves 52a to 52c.

  Even in the auxiliary trolley 12, the other elevating side shaft 52x, the elevating sheaves 52a and 52b, the equalizer sheave 52c, the fixed side shaft 53x, the fixed sheaves 53a and 53b, and the two winding drums 50 are hung. Since the structure of the wire rope 60 (60a, 60b) to be rotated is the same as that of the main trolley 11 described above, the same reference numerals are given and the description thereof is omitted here.

  Even in such a supplementary trolley 12, as in the case of the main trolley 11, as shown in FIG. 7, the distance D1 between the wire ropes wound around the equalizer sheave 52c is coaxial with the equalizer sheave 52c. Since the distance D2 is smaller than the distance D2 between the wire ropes hung around the other lifting sheaves 52a and 52b, the wire rope 60r hung from the double winding drum 50 to the lifting sheave 52b and the wire rope hung around the equalizer sheave 52c. The distance between 60s becomes long and interference of wire rope 60r and wire rope 60s can be prevented.

  Further, as in the case of the main trolley 11, the equalizer sheave 52c having a diameter smaller than the diameter of the other lifting sheaves 52a and 52b that are coaxially used is used, so that the interference between the wire rope 60r and the wire rope 60s is prevented. Is simple.

  FIG. 11 is an explanatory diagram when another equalizer is used. Here, instead of the sieve type equalizer 52c shown in FIGS. 6, 7 and 10, a balance type equalizer 54 is used.

  The equalizer 54 is rotatably supported by the elevating side shaft 52x, and is configured as a short plate having a triangular shape when viewed in the axial direction. The raising / lowering side shaft 52x is shifted from the center of gravity of the equalizer 54 to one apex side (the lower side in the drawing), and an intermediate portion of the wire rope 60 is connected to the other two apex sides. That is, the wire rope 60 is not hung around the equalizer 54 but is hung on the two vertex side. Then, the equalizer 54 swings (rotates) around the ascending / descending side shaft 52x so that the tensions of the one side 60a and the other side 60b of the wire rope 60 are balanced.

  Even in such an equalizer 54, the equalizer sheave 52 c on the main trolley 11 side shown in FIGS. 6 and 7 and the equalizer sheave 52 c on the auxiliary trolley 12 side shown in FIG. 10 are hung on the equalizer 54. Since the distance D1 between the wire ropes is smaller than the distance D2 between the wire ropes wound around the other lifting sheaves 52a and 52b that are coaxial with the equalizer 54, the distance D1 is hung from the double winding drum 50 to the lifting sheave 52b. The distance between the rotating wire rope 60r and the wire rope 60s hung on the equalizer 54 becomes longer, and interference between the wire rope 60r and the wire rope 60s can be prevented.

  As described above, the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the equalizers 52c and 54 are disposed outside in the left-right direction. However, it may be placed inside or in the middle. Further, the equalizers 52c and 54 may be provided on the fixed side shaft 53x instead of the lifting side shaft 52x. Also in this case, the distance D1 between the wire ropes hung on the equalizers 52c and 54 is smaller than the distance D2 between the wire ropes hung on the other fixed sheaves 53a and 53b coaxially with the equalizers 52c and 54. Therefore, the distance between the wire rope hung from the double winding drum 50 to the lifting sheave and the wire rope hung on the equalizers 52c and 54 becomes long, and the interference of the wire rope can be prevented. Thus, even when the equalizers 52c and 54 are provided on the fixed side shaft 53x, the position in the left-right direction may be any of the outside, the inside, and the middle. In addition, here, the case where two lifting sheaves, two fixed sheaves, and one equalizer are illustrated in one region of the two-winding drum 50 is illustrated, but four lifting sheaves, four fixed sheaves are illustrated. It can be applied to the case of 4 and 1 equalizer, and it can also be applied to the case of 6 lifting sheaves, 6 fixed sheaves and 1 equalizer. The fixed sheave is preferably applied to an even number of elevator sheaves and one equalizer.

  Moreover, in the said embodiment, in order to respond | correspond to heavy weight, although it is trying to perform 2 winding on both sides of one 2 winding drum 50, respectively (2 winding is performed in 2 places), The present invention can also be applied to a double-winding drum having only one 2-winding.

  Moreover, in the said embodiment, although the large bridge crane used as the dock of a shipyard was illustrated, it is applicable also to a smaller bridge crane, Furthermore, other than a bridge crane It is applicable to various crane devices.

  DESCRIPTION OF SYMBOLS 1 ... Bridge crane (crane apparatus), 50 ... Double winding drum, 52a, 52b ... Elevating sheave, 52c ... Equalizer sheave (equalizer), 52x ... Elevating side shaft, 53a, 53b ... Fixed sheave, 53x ... Fixed side shaft 54 ... Equalizer, 60 ... Wire rope, 60a ... One side of the wire rope, 60b ... The other side of the wire rope, 90 ... Suspension, D1 ... Distance between the wire ropes hung on the equalizer, D2 ... Hang on the sheave The distance between the turned wire ropes.

Claims (2)

By fixing both ends of one wire rope, one side and the other side of the wire rope extend, and by rotating, the other side of the wire rope is overlapped in two layers on one side of the wire rope A two-winding drum that winds or rewinds and lifts the hanging tool;
A fixed-side shaft fixed to the support portion side that rotatably supports the two-winding drum;
A plurality of fixed sheaves rotatably supported by the fixed side shaft;
An elevating side shaft fixed to the hanger side;
A plurality of elevating sheaves rotatably supported by the elevating side shaft ;
Before Symbol wire rope is wound around alternately with the fixed sheave and the elevator sheaves,
Is rotatably supported on the elevating side shaft or the fixed-side shaft, and a equalizer sheave to balance the tension of the one side and the other side of the wire rope by an intermediate portion of the wire rope is applied,
The crane apparatus characterized by the diameter of the said equalizer sheave being smaller than the diameter of the other sheave located coaxially with the said equalizer sheave . The equalizer sheave is rotatably supported by the lifting shaft and is disposed adjacent to a lifting sheave around which a wire rope from the double winding drum is wound. Item 5. The crane apparatus according to item 1.

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