JP7042080B2 - Lifting device with horizontal jib - Google Patents

Description

The present invention relates to a lifting device with a horizontal jib.

Conventionally, in construction work such as high-rise buildings, lifting devices such as undulating cranes, shuttle jib climbing cranes, and horizontal jib cranes have been frequently used as means for lifting and transporting materials and demolition materials and assembling work. (See, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

Of these, the horizontal jib crane is arranged with the jib (boom) protruding horizontally, so the height (occupied area / range in the vertical direction of the jib) can be kept small compared to undulating jib type cranes. It can be used very favorably when the upper region is limited.

In addition, the horizontal jib crane is provided with a swivel frame that is rotatably provided at the center of the axis extending in the vertical direction to support the horizontal jib, and the horizontal jib connects the rear end to the swivel frame so that the axis direction is horizontal. Fixed jib (main jib) supported toward Alternatively, there is one configured with a plurality of auxiliary jib).

Further, the horizontal jib crane is provided with an overhanging portion on the side opposite to the jib from the swivel frame, and a wire hoisting device connected to a hanging hook is installed on the overhanging portion.

Japanese Unexamined Patent Publication No. 2001-1808887 Japanese Unexamined Patent Publication No. 07-315766 Japanese Unexamined Patent Publication No. 07-113333

On the other hand, in the horizontal jib crane configured as described above, it is strongly desired to increase the transverse stroke amount of the slide jib as much as possible, expand the working range (working area) of the horizontal jib crane, and improve the working performance of the horizontal jib crane. It is rare.

In view of the above circumstances, it is an object of the present invention to provide a lifting device provided with a horizontal jib that enables the lifting work range to be suitably expanded.

In order to achieve the above object, the present invention provides the following means.

The lifting device provided with the horizontal jib according to the present invention is horizontally composed of a fixed jib and a single or a plurality of slide jib provided so as to be relatively free to move forward and backward in the horizontal axial direction with respect to the fixed jib. The jib, a swivel frame that supports the horizontal jib so that it can swivel around the axis in the vertical direction, an overhang frame that is integrally attached to the swivel frame and extends horizontally on the opposite side of the horizontal jib, and the tension. The slide jib is provided with a hoisting device which is arranged at the tip of the extension frame in the extending direction and winds up a wire connected to the hanging hook and unwinds to raise and lower the hanging hook. The slide jib is the hoisting device on the rear end side. The slide jib is formed with a notch to prevent interference with the slide jib, and the rear end portion of the slide jib and the hoisting device are formed when the rearmost retracting position of the slide jib is viewed from a direction orthogonal to the horizontal axial direction. It is characterized in that it is configured so as to be in an overlapping position.

In the lifting device provided with the horizontal jib of the present invention, the lifting work range can be suitably expanded.

It is a side view which shows the horizontal jib crane (tower crane / lifting apparatus) which concerns on one Embodiment of this invention. It is a side view which shows the horizontal jib crane which concerns on one Embodiment of this invention. It is an arrow view of X1-X1 of FIG. 2, and is the top view which shows the horizontal jib crane which concerns on one Embodiment of this invention. It is a vertical sectional view which shows the fixed jib and the intermediate slide jib of the horizontal jib which concerns on one Embodiment of this invention. It is a vertical sectional view which shows the intermediate slide jib and the tip slide jib of the horizontal jib which concerns on one Embodiment of this invention. It is a side view which shows the advancing / retreating drive mechanism for the intermediate jib of the horizontal jib crane which concerns on one Embodiment of this invention. It is a top view which shows the advance / retreat drive mechanism for the intermediate jib of the horizontal jib crane which concerns on one Embodiment of this invention. It is a side view which shows the advancing / retreating drive mechanism for the intermediate jib of the horizontal jib crane which concerns on one Embodiment of this invention. It is a side view which shows the advance / retreat drive mechanism for the tip jib of the horizontal jib crane which concerns on one Embodiment of this invention. It is a top view which shows the advance / retreat drive mechanism for the tip jib of the horizontal jib crane which concerns on one Embodiment of this invention. It is a side view which shows the advance / retreat drive mechanism for the tip jib of the horizontal jib crane which concerns on one Embodiment of this invention. It is a side view which shows the state which extended the horizontal jib of the horizontal jib crane which concerns on one Embodiment of this invention. FIG. 12 is a side view showing a state in which the intermediate slide jib of the horizontal jib of the horizontal jib crane according to the embodiment of the present invention is retracted to the end. FIG. 13 is a side view showing a state in which the tip slide jib of the horizontal jib of the horizontal jib crane according to the embodiment of the present invention is retracted to the end. It is a side view which shows the advance / retreat drive mechanism (advance / retreat drive mechanism for intermediate jib) of the horizontal jib crane which concerns on one Embodiment of this invention. (A) is the X1-X1 line arrow view of FIG. 15, (b) is the X2-X2 line arrow view of FIG. 15, and (c) is the X3-X3 line arrow view of FIG. It is a perspective view which shows the roller of the horizontal jib crane which concerns on one Embodiment of this invention. It is a side view which shows the slip ring structure of the horizontal jib crane which concerns on one Embodiment of this invention. It is a side view which shows the slip ring structure of the horizontal jib crane which concerns on one Embodiment of this invention, and is the figure which shows the state which retracted the slip ring. It is a perspective view which shows the roller and the protrusion of the slip ring structure of the horizontal jib crane which concerns on one Embodiment of this invention.

Hereinafter, a lifting device provided with a horizontal jib according to an embodiment of the present invention will be described with reference to FIGS. 1 to 20.

Here, in the present embodiment, the lifting device provided with the horizontal jib of the present invention will be described as a means for lifting and transporting and assembling materials and dismantled materials in the construction work of a high-rise building. In other words, in the present embodiment, the lifting device provided with the horizontal jib of the present invention will be described as a horizontal jib crane (tower crane).
The lifting device provided with the horizontal jib according to the present invention does not necessarily have to be applied to the construction work of a high-rise building, and can be applied as a means for transporting any load.

As shown in FIG. 1, the horizontal jib crane (lifting device provided with a horizontal jib) A of the present embodiment is a mast that is supported by a building and is vertically erected and is projected upward from the top layer of the building. Supported by 1, it is provided on the top side of the mast 1.

The mast 1 is provided in a mast opening formed in communication with the building in the vertical direction, and is arranged so as to penetrate the building.

The mast 1 has a mast body 2 that can be adjusted to a desired length by adding or removing a plurality of mast pieces, and the mast body 2 in order from the upper (top) side to the lower side of the mast body 2. It includes a swivel device 3, an elevating device 4, an upper support portion 5, and a lower support portion 6 that are integrally attached.

The swivel device 3 is provided on the top of the mast main body 2, and includes a swivel frame (swivel frame) 7 that rotates forward and reverse around the axis O1 extending in the vertical direction of the mast main body 2 by rotating gears by a motor. It is configured. Further, a horizontal plate-shaped opening / closing sidewalk is provided at the upper end of the swivel frame 7, and a through hole through which a mast piece can be inserted is formed directly above the mast body of the opening / closing sidewalk. Further, the driver's cab 8 is arranged on the outer side of the swivel frame 7.

The elevating device 4 includes an elevating drive / fixing means such as a lock pin mechanism and an elevating hydraulic jack, and raises the mast body 2 by using the elevating drive / fixing means together with a climbing gantry disposed below the elevating device 4. Alternatively, it is configured to be able to descend.

The upper support portion 5 is arranged at a predetermined position of the mast main body 2 at a predetermined distance in the vertical direction from the climbing gantry, and is detachably fixed to a building frame such as a floor slab on a predetermined level to be detachably fixed to the mast main body 2. Supports horizontal and vertical loads acting on.

The lower support portion 6 is arranged below the mast main body 2 at a predetermined distance in the vertical direction from the upper support portion 5, and like the upper support portion 5, a part of the lower support portion 6 is provided on a building frame such as a floor slab on a predetermined level. It is detachably fixed and supports the horizontal load acting on the mast body 2.

The horizontal jib crane A is connected to the swivel frame 7 of the swivel device 3 and is arranged on the top of the mast 1.

Specifically, as shown in FIGS. 1 to 3, the horizontal jib crane A of the present embodiment has a horizontal jib 10 provided with the axis O2 direction arranged horizontally and a swivel frame 7 at the rear end of the horizontal jib 10. A fixed support frame 11 for connecting to and supporting the horizontal jib 10, an overhanging frame 12 integrally attached to the swivel frame 7 and extending horizontally on the opposite side of the horizontal jib 10, and provided at the tip of the horizontal jib 10. A sheave 13, a hanging hook 15 that is suspended and supported by a wire 14 via the sheave 13, and a wire 14 that is arranged on the extending direction tip side of the overhanging frame 12 and is connected to the hanging hook 15. It is configured to include a hoisting device 16 for hoisting and unwinding to raise and lower the hanging hook 15.

The horizontal jib 10 can advance and retreat directly or indirectly in the horizontal axis O2 direction with respect to the fixed jib 20 arranged by connecting the rear end portion to the fixed support frame 11 (sliding). It is equipped with a plurality of slide jib 21, 22 supported by (horizontal possible). In this embodiment, it is assumed that the plurality of slide jib 21 and 22 are two slide jibs, an intermediate slide jib 21 and a tip slide jib 22.

The fixed jib 20 is formed by assembling a steel frame to form a truss structure and having a hollow inside. Further, as shown in FIGS. 2 and 4, the fixed jib 20 of the present embodiment is a square frame portion 20a formed in a substantially rectangular shape in a vertical cross-sectional view in which the rear end portion side in the axis O2 direction is orthogonal to the axis O2. ing. On the other hand, in the portion from the square frame portion 20a to the tip portion, a communication portion 23 extending from the tip portion to the square frame portion is provided at the center of the width direction T1 orthogonal to the axis O2 at the lower end portion thereof, and is substantially co-shaped in vertical cross-sectional view. It is a communication frame portion 20b formed in a character shape.

As shown in FIGS. 1 to 3, the intermediate slide jib 21 and the tip slide jib 22 are formed as a truss structure by assembling a steel frame and having a hollow inside, similarly to the fixed jib 20. Further, as shown in FIG. 5, the tip slide jib 22 is formed in a substantially rectangular shape in a vertical cross-sectional view. As shown in FIG. 2, the intermediate slide jib 21 is provided with a square frame portion 21a on the rear end portion side in the O2 direction of the axis, while the portion from the square frame portion 21a to the tip portion is a communication frame portion 21b, and FIG. As shown in FIG. 5, a communication portion 24 is provided at the center of the lower end portion in the width direction T1 from the front end portion to the rear end portion, and is formed in a substantially U shape in a vertical cross-sectional view.

Further, the intermediate slide jib 21 has a vertical cross-sectional shape (cross-sectional area) smaller than that of the fixed jib 20, and the tip slide jib 22 has a vertical cross-sectional shape (cross-sectional area) smaller than that of the intermediate slide jib 21. An intermediate slide jib 21 is provided inside the intermediate slide jib 21, and a tip slide jib 22 is inserted inside the intermediate slide jib 21 so as to be able to move forward and backward (moving freely) while pointing the axis O2 direction in the same direction.

Further, as shown in FIG. 2, the intermediate slide jib 21 and the tip slide jib 22 are formed so that their rear ends are gradually inclined from the rear end toward the tip as the rear end is gradually inclined from the upper end to the lower end in a side view. Has been done. That is, the intermediate slide jib 21 and the tip slide jib 22 are provided with a notch portion 25 having a substantially right triangle shape in a side view below the rear end portion side.

Next, an advance / retreat drive mechanism for advancing / retreating / traversing the intermediate slide jib 21 and the tip slide jib 22 in the axis O2 direction with respect to the fixed jib 20 (advance / retreat drive mechanism 26 for intermediate jib and advance / retreat drive mechanism 27 for tip jib). Will be explained.

As shown in FIGS. 2, 4, 5, 6 to 8, the advance / retreat drive mechanism 26 for the intermediate jib is provided with a roller surface arranged inside the square frame-shaped fixed jib 20 in a vertical cross-sectional view. The rollers 28 and 29, rails 30 and 31 provided on the outside of the intermediate slide jib 21, and a transverse drive device 32 for the intermediate jib are provided.

The rollers 28 and 29 of the advancing / retreating drive mechanism 26 for the intermediate jib are provided on both sides of T1 in the width direction on the rear end side of the upper portion of the fixed jib 20 and the tip end side of the lower portion, respectively. That is, the advancing / retreating drive mechanism 26 for the intermediate jib includes two rollers 28 and 29 on the rear end side of the upper part of the fixed jib 20 and two on the lower part on the tip end side of the upper rear end part, for a total of four rollers 28 and 29. ing. Further, the rollers 28 and 29 are attached so that the rotation axis is directed to T1 in the width direction of the fixed jib 20.

As shown in FIGS. 4 and 5, the rails 30 and 31 of the intermediate jib advance / retreat drive mechanism 26 extend from the front end to the rear end of the intermediate slide jib 21 along the axis O2 direction, and the intermediate slide jib 21 It extends to both sides of T1 in the width direction on the outer side of the upper part and on both sides of T1 in the width direction on the outer side of the lower part. That is, the advance / retreat drive mechanism 26 for the intermediate jib is provided with rails 30 and 31 having two rails on the upper outer side and two rails on the lower outer side of the intermediate slide jib 21, for a total of four rails.

Then, the intermediate slide jib 21 is inserted into the fixed jib 20 while aligning the axes O2 directions with each other, and the two rollers 28 on the rear end side of the upper portion of the fixed jib 20 and the upper portion of the intermediate slide jib 21. The two outer rails 30 are engaged, and the two rollers 29 on the tip side of the lower part of the fixed jib 20 are engaged with the two rails 31 on the lower outer side of the intermediate slide jib 21, and the fixed jib 20 is engaged. It is provided so as to be able to move forward and backward in the direction of the axis O2.

As shown in FIGS. 6 to 8, the traverse drive device 32 for an intermediate jib includes a drive means 33 such as an electric motor, a pair of sprockets (fixed jib side sprocket, rotary support) 34, and a drive chain (cable body). It is equipped with 35.

The drive means 33 such as an electric motor is provided by fixing the rotary drive shaft to which the sprocket is attached to the fixed jib 20 in the width direction T1.

The pair of sprockets 34 are provided near the rear end side and the tip side of the rotation drive shaft of the drive means 33, respectively, and the rotation shaft is pivotally supported by the fixed jib 20 in the width direction T1. ..

Both ends of the drive chain 35 are fixed to the upper ends of the intermediate slide jib 21 on the rear end side and the tip end side, respectively, with the tail metal fittings 36, and are attached to the pair of sprockets 34 and the rotary drive shaft of the drive means 33. It meshes with the sprocket and is wound around it, and extends in the direction of the axis O2 of the intermediate slide jib 21 in a plan view.

Further, the intermediate jib advance / retreat drive mechanism 26 of the present embodiment includes a pair of intermediate jib traverse drive devices 32, and a pair of intermediate jib traverse drive devices 32 are provided on both sides of the horizontal jib 10 in the width direction T1. Has been done.

As shown in FIGS. 2, 4, 5, 9 to 11, the advancing / retreating drive mechanism 27 for the tip jib is provided by arranging a roller surface on the outside of the square frame-shaped tip slide jib 22 in a vertical cross-sectional view. The rollers 40 and 41 are provided, the rails 42 and 43 provided on the inner side of the intermediate slide jib 21, and the transverse drive device 44 for the tip jib are provided.

As shown in FIGS. 4 and 5, the rollers 40 and 41 of the advancing / retreating drive mechanism 27 for the tip jib have the width between the upper rear end portion and the lower rear end portion forming the notch 25 of the tip slide jib 22. It is provided on both sides of the direction T1. That is, there are four advance / retreat drive mechanisms 27 for the tip jib, two on the rear end side of the upper part of the tip slide jib 22 and two on the lower rear end side on the tip side of the upper rear end. It includes rollers 40 and 41. Further, the rollers 40 and 41 are attached so that the rotation axis is directed to T1 in the width direction of the tip slide jib 22.

The rails 42 and 43 of the advancing / retreating drive mechanism 27 for the tip jib extend from the tip to the rear end of the intermediate slide jib 21 along the axis O2 direction, and are on both sides of the upper inner side of the intermediate slide jib 21 in the width direction T1. And on both sides of T1 in the width direction inside the lower part, respectively. That is, the advance / retreat drive mechanism 26 for the intermediate jib is provided with two rails inside the upper part of the intermediate slide jib 21 and two rails inside the lower part, for a total of four rails 42 and 43.

Then, the tip slide jib 22 is inserted inside the intermediate slide jib 21 while aligning the axes O2 directions with each other, and the two rollers 40 on the rear end side of the upper part of the tip slide jib 22 and the intermediate slide jib 21. Engage the two rails 42 on the inner side of the upper part of the above, and engage the two rollers 41 on the rear end side of the lower part of the tip slide jib 22 with the two rails 43 on the inner side of the lower part of the intermediate slide jib 21. , The intermediate slide jib 21 and the fixed jib 20 are provided so as to be freely advancing and retreating in the axis O2 direction.

As shown in FIGS. 9 to 11, the traversing drive device 44 for the tip jib includes a drive means 45 such as an electric motor, a pair of fixed jib side sprockets (rotational support) 46, and a pair of intermediate jib side sprockets (rotation). It includes a support (support) 47 and a drive chain (cable) 48.

The drive means 45 such as an electric motor is provided by fixing the rotary drive shaft to which the sprocket is attached to the fixed jib 20 in the width direction T1.

The pair of fixed jib side sprockets 46 are provided near the rear end side and the tip side of the rotation drive shaft of the drive means 45, respectively, and support the fixed jib 20 with the rotation shaft facing the width direction T1. Has been done.

The pair of intermediate jib side sprockets 47 are pivotally supported by the intermediate slide jib 21 on the rear end side and the tip end side of the upper portion of the intermediate slide jib 21, respectively, with the rotation axis directed to T1 in the width direction.

The drive chain 48 has both ends fixed to the upper part on the rear end side of the tip slide jib 22 with a tail metal fitting 49, a pair of fixed jib side sprockets 46, a pair of intermediate jib side sprockets 47, and a drive means 45. It meshes with a sprocket attached to the rotary drive shaft of No. 1 and is wound around the sprocket, and extends in the axis O2 direction of the intermediate slide jib 21 and the tip slide jib 22 in a plan view.

Further, the transverse drive device 44 for the tip jib of the present embodiment is provided with a drive chain 48 arranged at the center of T1 in the width direction of the horizontal jib 10. That is, the drive chain 48 of the tip jib traverse drive device 44 is arranged between the pair of drive chains 35 of the pair of intermediate jib traverse drive devices 32.

As shown in FIG. 2, the fixed support frame 11 supports the horizontal jib 10 by connecting and fixing the rear end portion of the fixed jib 20 to the swivel frame 7, and also applies the horizontal load and the vertical load from the suspended load to the mast 1. It is intended to be transmitted to.

The fixed support frame 11 of the present embodiment includes a pair of front vertical support members 50, a pair of rear diagonal support members 51, and a pair of front diagonal support members 52.

The lower end of each pair of front vertical support members 50 is pin-coupled to both sides of the tip side of the swivel frame 7 on the side where the horizontal jib 10 is arranged, and is extended upward in the vertical direction. It is arranged by being pin-coupled to the upper part of the rear end portion of the fixed jib 20 via the connection plate 53.

The lower ends of each pair of rear diagonal support members 51 are pin-coupled to both sides of the swivel frame 7 on the rear end side, and the upper ends thereof are connected to the upper ends of the front vertical support members 50 via the connection plate 53. Pin join. The upper end of the front vertical support member 50 is arranged by being pin-coupled to the rear end portion of the upper part of the fixed jib 20.

Each of the pair of front slanted support members 52 has its lower end pin-coupled to the lower end of the fixed jib 20 on the front side of the rear end of the lower portion of the fixed jib 20 pin-coupled to the tip of the swivel frame 7. The upper end thereof is pin-coupled to the rear end portion of the upper portion of the fixed jib 20, the upper end portion of the front vertical support member 50, and the upper end portion of the rear oblique support member 51 via the connection plate 53.

As shown in FIGS. 2 and 3, the overhanging frame 12 is formed in a substantially rectangular shape in a plan view, the tip portion is fixed to the swivel frame 7, and the swivel frame 7 extends to the opposite side of the horizontal jib 10 in between. It is provided. Further, the upper surface of the overhanging frame 12 is formed in a flat shape by attaching a plate material or the like, and is substantially flush with the upper surface of the openable sidewalk of the swivel frame 7.

The hoisting device 16 is installed on the upper surface of the overhanging frame 12 on the rear end side. The wire 14 unwound from the hoisting device 16 is horizontally extended through the inside of the fixed support frame 11, the fixed jib 20, the intermediate slide jib 21, and the tip slide jib 22. The wire 14 is wound around a sheave 13 attached to the tip of the tip slide jib 22 and connected to a hanging hook 15.

Further, in the present embodiment, as shown in FIG. 2, a counter diagonal support member 55 for supporting the overhanging frame 12 and the hoisting device 16 is provided.

The upper end of the counter oblique support member 55 is the upper end of the rear end of the fixed jib 20 via the connecting plate 53, the upper end of the front vertical support member 50, the upper end of the rear oblique support member 51, and the front oblique support member 52. The lower end is pin-coupled to the upper end of the overhanging frame 12, and the lower end thereof is pin-coupled to the rear end portion side of the overhanging frame 12.

Then, in the horizontal jib crane A of the present embodiment configured as described above, as shown in FIGS. 8, 11, 2, 12 to 14, the drive means 33 of the traverse drive device 32 for the intermediate jib is positive. When the drive chain 35 is driven in the reverse rotation, the drive chain 35 moves forward and backward (forward and reverse rotation) according to the forward and reverse rotation, and the intermediate slide jib 21 can be moved back and forth (horizontal and sliding) with respect to the fixed jib 20. can.

When the drive means 45 of the transverse drive device 44 for the tip jib is driven by forward / reverse rotation, the drive chain 48 is driven back and forth (forward / reverse rotation) according to the forward / reverse rotation, and the tip slide jib 22 is fixed to the fixed jib 20 and further. Can be moved back and forth (traverse, slide) with respect to the intermediate slide jib 21.

This makes it possible to appropriately expand and contract the horizontal jib 10 to change its length. Further, at this time, by using the drive chains 35, 48 and the sprockets 34, 46, 47 as the drive mechanism instead of the conventional rack and pinion or cylinder, the fixed jib 20, the intermediate slide jib 21, and the tip slide jib 22 are used. Even if the meshing is displaced due to the deflection or the axis is shaken due to the forward / backward movement, it is possible to realize smooth horizontal movement as compared with the conventional case.

Further, in the present embodiment, the sprockets 34, 46 are provided by providing the pair of sprockets 34, 46 in the vicinity immediately below the rotary drive shaft of the drive means 33, 45 (near the front and rear in the axis O2 direction below the rotary drive shaft). The drive chains 35, 48 of the portion wound around the rotary drive shaft of the drive means 33, 45 can reliably transmit power without being disengaged from the sprockets 34, 46, 47. From this point as well, it is possible to realize highly reliable and smooth traverse movement.

It is possible to obtain the same effect by using a wire (cable) and a pulley (rotary support) instead of the drive chains 35, 48 and sprockets 34, 46, 47. Further, the pair of sprockets 34, 46 may be provided in the immediate vicinity of the rotation drive shaft of the drive means 33, 45 (above the rotation drive shaft and in the front-rear direction in the axis O2 direction), and in this case, the same as above. It is possible to obtain an action effect.

Further, in the horizontal jib crane A of the present embodiment, as shown in FIGS. 2, 12 to 14, the intermediate slide jib 21 is driven by the traverse drive device 32 for the intermediate jib, and the rear end portion thereof becomes the hoisting device 16. The intermediate slide jib 21 can be retracted until just before the interference. At the same time, since the communication frame portion 20b of the fixed jib 20 and the communication frame portion 21b of the intermediate slide jib 21 are provided with the communication portions 23 and 24 and are formed in a substantially U-shaped vertical cross section, the tip of the tip slide jib 22 is formed. The wire 14 and the hanging hook 15 hanging from the sheave 13 of the portion pass through the communication portion 24 of the intermediate slide jib 21 and the communication portion 23 of the communication frame portion 20b of the fixed jib 20 so as not to interfere with the fixed jib 20 and the intermediate slide jib 21. .. As a result, the tip slide jib 22 can be greatly retracted until the tip of the tip slide jib 22 is located at the rear end of the communication frame portion 20b of the fixed jib 20.

Therefore, as shown in FIG. 1, the horizontal jib crane A of the present embodiment has the most retracted position (minimum) from the position where the horizontal jib 10 is most extended (maximum working radius) and the tip slide jib 22 is retracted most. It is possible to take a very large working range up to the working radius).

Further, the last retracted position of the intermediate slide jib 21 and the tip slide jib 22 is restricted to a position that does not interfere with the hoisting device 16. On the other hand, in the horizontal jib crane A of the present embodiment, a notch portion 25 having a substantially right triangle is provided on the rear end side of the intermediate slide jib 21 and the tip slide jib 22 in a side view. As a result, as shown in FIGS. 13 and 14, the notch 25 serves as a relief portion for the hoisting device 16, and even if the upper portion of the rear end portion is arranged above the hoisting device 16, it interferes with the hoisting device 16. The rearmost retreating position of the intermediate slide jib 21 and the tip slide jib 22 can be further rearward without the need for this. Therefore, the length of the communication frame portion 20b of the fixed jib 20 can be increased to further expand the working range.

On the other hand, as described above, the communication frame portion 20b of the fixed jib 20 and the communication frame portion 21b of the intermediate slide jib 21 are provided with communication portions 23 and 24 extending along the axis O2 direction in the central portion of the lower surface thereof, and the vertical cross section is substantially the same. In the case of being formed in a character shape, the communication frame portion 20b or the intermediate slide of the fixed jib 20 is formed so that the width of the communication portions 23 and 24 is expanded by the acting load when the load is lifted by the suspension hook 15. Deflection deformation may occur in the jib 21.

On the other hand, in the present embodiment, for example, as shown in FIGS. 15, 16 (a), 16 (b), and 16 (c), first, an intermediate slide is attached to the fixed jib 20 and the tip slide jib 22. A stopper (side shoe) 37 is provided as a first safety mechanism in a state where a predetermined interval is provided in the width direction T1 with respect to the rails 30, 31, 42, and 43 provided on the jib 21. Then, in the present embodiment, even if a load acts on the fixed jib 20 and the intermediate slide jib 21 to open and deform the communication portions 23 and 24 so as to expand the width and the rail span changes, the first safety mechanism is used. When the stopper 37 hits the rails 30, 31, 42, 43, it is not affected by the stopper 37, and the rollers 28, 29, 40, 41 can be prevented from coming off (falling off) from the rails 30, 31, 42, 43. ..

In addition to this, as shown in FIGS. 16 and 17, rails 30, 31, 42, and 43 abut against some of the rollers 28, 29, 40, 41 (28b, 29b, 40b, 41b). A pair of flanges 57, which project radially outward on both sides of the surface 56 and extend in the circumferential direction of the axial center of the rollers 28, 29, 40, 41 and are connected in an annular shape, are provided as a second safety mechanism. By providing the second safety mechanism, when the fixed jib 20 or the intermediate slide jib 21 is deformed by opening the fixed jib 20 or the intermediate slide jib 21 so that the width of the communicating portions 23 and 24 is expanded by applying a load to the fixed jib 20 and the intermediate slide jib 21. , Rails 30, 31, 42, 43 hit the flanges 57 of the rollers 28, 29, 40, 41 (28b, 29b, 40b, 41b), and the rails 30, 31, 42, 43 to the rollers 28, 29, 40, 41. Can be prevented from coming off.

Here, in the present embodiment, when the fixed jib 20 or the intermediate slide jib 21 is opened and deformed, the rails 30, 31, etc. are preceded by the flanges 57 of the rollers 28, 29, 40, 41 of the second safety mechanism. 42 and 43 are configured to hit the stopper 37 of the first safety mechanism. As a result, even if the derailment prevention function by the stopper 37 of the first safety mechanism does not work sufficiently, the derailment can be performed by the flange 57 of the rollers 28, 29, 40, 41 of the second safety mechanism. Can be prevented. Therefore, it is possible to impart double safety performance and more reliably prevent the occurrence of derailment. Further, the rollers 28, 29, 40, 41 (28b, 29b, 40b, 41b) provided with the flange 57 are widened in the width direction T1, so that the rails 30, 31, 42, 43 are more derailed (dropped off). It becomes difficult to do.

Further, as shown in FIG. 17, the rollers 28, 29, 40, and 41 have a contact surface (roller surface) 56 with which a rail facing the radial outer side of the axis abuts in the radial direction of the center of the rotation axis in a cross-sectional view. It is formed in a convex arc shape (convex arc surface shape) on the outside. As a result, even when the fixed jib 20 and the intermediate slide jib 21 are opened and deformed, and the contact surfaces of the rails 30, 31, 42, and 43 are tilted and the angles are changed, the rails 30, 31 are reliably and suitably used. , 42, 43 can be brought into contact with the contact surface (roller surface) of the rollers 28, 29, 40, 41, and the intermediate slide jib 21 and the tip are always kept in response to changes in the suspension load. It becomes possible to smoothly and appropriately move the slide jib 22 forward and backward / traverse movement.

Further, in the present embodiment, as shown in FIGS. 2, 15, and 16, the rollers 28 and 29 of the intermediate jib advance / retreat drive mechanism 26 are provided in the same direction on both ends of the roller support arm and the roller support arm, respectively. A rocker type (swing type, seesaw type) roller device 38 having a pair of left and right rollers (28, 29) rotatably supported by arranging a rotating shaft is used. The rocker type roller device 38 is provided in the center between the pair of left and right rollers (28, 29) of the roller support arm, and a rotating shaft extending in the same direction as the rollers (28, 29) is pivotally supported by the fixed jib 20. , Is rotatably attached around an axis extending in the width direction T1 of the fixed jib 20.

When the rocker type roller device 38 is used, the roller device 38 rotates and is driven by the relative displacement of the fixed jib 20 and the intermediate slide jib 21, so that the roller surfaces of the rollers 28 and 29 always preferably hit the rails 30 and 31. It can be brought into contact with each other, and smooth and suitable advancing / retreating / traversing movement becomes possible. Further, by using the rocker type roller device 38, the diameter of the rollers (28, 29) can be reduced, and the height of the horizontal jib 10 can be kept small. Of course, a rocker type roller device 38 may be used as the rollers 40 and 41 of the advancing / retreating drive mechanism 27 for the tip jib. And, in this case as well, it is possible to obtain the same effect.

Further, in the horizontal jib crane A of the present embodiment, a counter diagonal support member 55 for supporting the overhanging frame 12 and the hoisting device 16 is provided. As a result, the overhanging frame 12 and the hoisting device 16 are supported by the counter diagonal support member 55, and the counter diagonal support member 55 is pin-coupled to the fixed support frame 11 via the fixed support frame 11. Connect with 10. Therefore, the overhanging frame 12 and the hoisting device 16 can function as counterweights.

As a result, in the horizontal jib crane A of the present embodiment, it is not necessary to separately provide a counterweight as in the conventional case (or a counterweight having a small weight can be used).

Further, drive means 33 and 45 (traverse drive devices 32 and 44) for driving the intermediate slide jib 21 and the tip slide jib 22 forward and backward, respectively, are collectively attached to the fixed jib 20. As a result, the horizontal jib crane A having excellent handleability and maintainability can be realized.

Further, the fixed support frame 11 is configured to include a front vertical support member 50, a rear oblique support member 51, and a front oblique support member 52, and also includes a front vertical support member 50, a rear oblique support member 51, and a front oblique support member 51. The installation support member 52, the counter diagonal support member 55, and the fixed jib 20 are pin-coupled. As a result, the members 50, 51, and 52 can be easily disassembled, and can be easily transported and assembled at the installation site. Further, since the fixed jib 20 is supported from the rear by the rear oblique support member 51, the height of the fixed support frame 11 can be suppressed to be significantly smaller than before.

Therefore, according to the horizontal jib crane A of the present embodiment, it is possible to realize a lifting device equipped with a horizontal jib 10 that can be smoothly moved laterally and that can keep the height as small as possible. Become.

Here, as shown in FIGS. 18 and 19, the horizontal jib crane A of the present embodiment is provided with a slip ring 58 for supplying power to the turning device 3, the driving means 33, 45, the hoisting device 16, and the like. ing.

Generally, the slip ring 58 is arranged directly above the swivel frame 7. However, in the horizontal jib crane A of the present embodiment, since each jib of the intermediate slide jib 21 and the tip slide jib 22 advances / retreats / traverses in the horizontal direction, if the slip ring 58 is arranged directly above the swivel frame 7, the horizontal jib 10 Will interfere with.

Therefore, in the present embodiment, the slip ring 58 is arranged above the top of the mast and below the openable sidewalk (inside the swivel frame 7). Further, the upper end portion is connected to the swivel frame 7, the slip ring 58 is placed on a mounting table attached to the lower end portion of the hanging support frame 60 suspended below, and the slip ring 58 is suspended and supported. It is configured in.

As a result, the slip ring 58 does not interfere with the wire 14 unwound from the horizontal jib 10 and the hoisting device 16, and the horizontal jib crane A can be suitably configured and driven.

On the other hand, in such a configuration, when adding the mast 1 of the tower crane, it is necessary to move the slip ring 58 to a position where it does not overlap with the through hole of the openable sidewalk in the vertical direction.

On the other hand, in the present embodiment, a rail 7a extending in the lateral direction is provided at the upper end of the swivel frame 7. In this embodiment, the rail 7a also serves as a constituent member of the swivel frame 7. Further, as shown in FIG. 20, a pair of upper and lower rollers 61 are provided at the upper end of the suspension support frame 60. Then, the suspension support frame 60 is suspended and installed so that the rail 7a is sandwiched between the upper roller 61 and the lower roller 61, and the slip ring 58 is placed and fixed on the mounting table.

With this configuration, as shown in FIGS. 18 and 19, when the operator pushes and pulls the suspension support frame 60, the pair of upper and lower rollers 61 in contact with the rail 7a rotate, and can be easily performed with a small force. The suspension support frame 60 and thus the slip ring 58 can be laterally moved along the rail 7a.

As a result, even when the slip ring 58 is arranged inside the swivel frame 7, the operator pushes the suspension support frame 60 when adding the mast 1 or the like, and the operator can easily and safely push the slip ring 58 from directly above the mast 1. The heavy slip ring 58 can be retracted. Further, the operator can pull the suspension support frame 60 and easily return it to a predetermined position directly above the mast 1.

Further, for example, a pin insertion hole 62 is provided in advance in a swivel frame 7 at a predetermined position directly above the mast 1 or at a retracted position of the slip ring 58. Further, a pin insertion hole 62 is also provided at a predetermined position of the suspension support frame 60. Then, in a state of being arranged at a predetermined position directly above the mast 1 or at a predetermined retracted position of the slip ring 58, an operator is provided on the swivel frame 7 and the suspension support frame 60, and a pin is inserted into a pin insertion hole 62 that communicates with each other. By inserting the slip ring 58, the slip ring 58 arranged at these predetermined positions can be fixed.

Further, in the present embodiment, at the upper end of the suspension support frame 60, a pair of rollers 61, a pair of protrusions 63, a midpoint of a straight line connecting the installation points of the pair of protrusions 63, and a pair of rollers 61. It is provided so that the midpoints of the straight lines connecting the installation points of are overlapped. As a result, when suspending the slip ring 58, the roller 61 naturally engages with the rail 7a and can grip the rail 7a. At the same time, when an upward load and a horizontal load are applied to the slip ring 58, the suspension support frame 60 can be locked (stoppered) by the protrusion 63 so as to be lifted and not inverted. Further, even when an excessive force is applied when the slip ring is retracted, it can be locked (stoppered) by the protrusion 63. This makes it possible to greatly improve operability.

Although the embodiment of the horizontal jib crane according to the present invention has been described above, the present invention is not limited to the above embodiment and can be appropriately modified without departing from the spirit of the present invention.

1 Mast 2 Mast body 3 Swivel device 4 Elevating device 5 Upper support part 6 Lower support part 7 Swivel frame (swivel frame)
7a Rail 8 Driver's cab 10 Horizontal jib 11 Fixed support frame 12 Overhang frame 13 Sheave 14 Wire 15 Suspended hook 16 Hoisting device 20 Fixed jib 20a Square frame part 20b Communication frame part 21 Intermediate slide jib (slide jib)
21a Square frame part 21b Communication frame part 22 Tip slide jib (slide jib)
23 Communication part 24 Communication part 25 Notch part 26 Advance / retreat drive mechanism for intermediate jib (advance / retreat drive mechanism)
27 Advance / retreat drive mechanism for tip jib (advance / retreat drive mechanism)
28 Roller 29 Roller 30 Rail 31 Rail 32 Traverse drive device for intermediate jib (traverse drive device)
33 Drive means 34 Sprocket (rotary support)
35 drive chain (cable body)
36 Shitte hardware 37 Stopper 38 Rocker type roller device 40 Roller 41 Roller 42 Rail 43 Rail 44 Traverse drive device for tip jib (traverse drive device)
45 Drive means 46 Fixed jib side sprocket (rotary support)
47 Intermediate jib side sprocket (rotary support)
48 drive chain (cable)
49 Shitte hardware 50 Front vertical support member 51 Rear diagonal support member 52 Front diagonal support member 53 Connection plate 55 Counter diagonal support member 56 Roller contact surface 57 Roller flange 60 Suspended support frame 61 Roller 62 Pin insertion hole 63 Protrusion A Horizontal jib crane (lifting device with horizontal jib)
O1 axis line O2 axis line

Claims (1)

A horizontal jib consisting of a fixed jib and a single or multiple slide jib provided so as to be able to move forward and backward relative to the fixed jib in the horizontal axis direction.
A swivel frame that supports the horizontal jib so that it can swivel around the vertical axis,
An overhanging frame that is integrally attached to the swivel frame and extends horizontally on the opposite side of the horizontal jib.
It is provided at the tip of the overhanging frame in the extending direction, and is provided with a hoisting device that winds up a wire connected to the hanging hook and feeds it out to raise and lower the hanging hook.
The slide jib is formed with a notch on the rear end side to prevent interference with the hoisting device.
The feature is that the last retracted position of the slide jib is configured so that the rear end portion of the slide jib and the hoisting device overlap when viewed from a direction orthogonal to the horizontal axis direction. Lifting device with a horizontal jib.

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