JP4705224B2 - crane - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crane provided with a seismic isolation device.
[0002]
[Prior art]
Conventionally, in a traveling crane including a swinging support leg swingably attached to the traveling unit main body and a rigid support leg fixed to the traveling unit main body, in a position near the tip of the rigid support leg, A plurality of laminated rubber sheets laminated via metal plates are arranged side by side in a direction perpendicular to the direction of the traveling rail, and the plurality of laminated rubbers are sandwiched by a rubber clamping member from above and below. there are seismic structure traveling crane which is adapted to (Japanese open 2 000-44168 JP).
[0003]
[Problems to be solved by the invention]
However, if a plurality of laminated rubbers are used like the conventional vibration-proof structure of a traveling crane, the horizontal spring constant (horizontal reaction force), which is the original purpose of the laminated rubber, cannot be reduced, and the horizontal reaction force increases. The proper vibration isolation function may not be achieved.
[0004]
The present invention was invented in view of the conventional problems, and the object of the present invention is to provide laminated rubber type seismic isolation without killing the horizontal characteristics of the laminated rubber, that is, laminated rubber type seismic isolation device. An object of the present invention is to provide a crane that covers a weak point in the vertical direction (tensile direction) of the apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the crane of the present invention is provided with seismic isolation means between the traveling device and the crane structure, and the seismic isolation means includes a laminated rubber type seismic isolation device and prevents the crane structure from being lifted. a floating preventing means, and restraint means for restraining horizontal movement of the crane structure while working in the crane constructed from restraint releasing means for releasing the restraint of the crane structure when the earthquake occurred, the prevention means the floating The crane structure or a shaft provided on the upper block side of the crane structure, a shaft provided on the lower block side of the traveling device or the crane structure, and a link held by both shafts, and the restraint Means is composed of two sets of links bridged in an X shape between the shafts of the lifting prevention means, and the restraining means It is characterized in that connected by two members constituting each link the restraint release means.
[0006]
The above cranes usually carry out work such as cargo handling work with the laminated rubber type seismic isolation device restrained by the restraining means, but if an earthquake occurs during the work, the restraint releasing means works and the laminated rubber type seismic isolation system works. The restraint of the device is automatically released. And the crane structure is seismically isolated by the seismic isolation action of the laminated rubber type seismic isolation device.
[0008]
Further, the restraining means is provided with a restraining release means comprising a pin that is broken by a seismic force greater than a design value.
[0010]
Further, an initial position returning means comprising a hydraulic cylinder or a push bolt is provided between the traveling device and the crane structure or between upper and lower blocks of the crane structure.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0012]
1 and 2 show the crane 1 in which the seismic isolation means 40 is installed between the traveling device 2 and the crane structure 3. FIGS. 3 and 4 show the lower block 35 of the crane structure 3 and the crane structure 3. The crane 50 which installed the seismic isolation means 40 between the upper blocks 36 of this is shown. Each of the cranes 1 and 50 travels in the direction of the double-headed arrow E along the rail 30.
[0013]
The seismic isolation means 40 basically includes a so-called laminated rubber type seismic isolation device (hereinafter referred to as seismic isolation device) 4 formed by laminating a plurality of rubber plates via metal plates, The prevention means 5, the restraint means 6, and the restraint release means 18 are configured.
[0014]
In the case of the crane 1 of FIGS. 1 and 2, the seismic isolation device 4 is attached between a support member 23 provided in the traveling device 2 and a support member 29 provided in the crane structure 3 as shown in FIG. 7. Yes. Further, as shown in FIG. 7, the lifting prevention means 5 includes a pair of left and right mechanical link mechanisms 8 and 8. Each link mechanism 8 supports shafts 11 and 12 that are separately passed through two long holes 10 and 10 provided in a wide link 9 (see FIG. 5) by upper and lower brackets 13 and 13 ', respectively. It has become. The upper bracket 13 is fixed to the lower surface of the crane structure 3, and the lower bracket 13 ′ is fixed to the upper surface of the traveling device 2.
[0015]
As shown in FIG. 5, restraining means 6 for restraining the horizontal movement of the crane structure 3 during work is provided at the ends of the two upper and lower shafts 11 and 12 of the lifting prevention means 5. As shown in FIG. 8, the restraining means 6 is constituted by two sets of links 14, 14 that are bridged in an X shape between shafts 11, 12 arranged in an oblique manner. Each link 14 includes a short piece portion 16 having a connecting plate 15 and a long piece portion 17 having no connecting plate 15. The connecting plate 15 is connected to the long piece portion 17 by a shear pin or a pulling pin 18. The shear pin or the pull pin 18 is designed to be broken when a stress greater than the design value is applied, and constitutes a so-called restraint releasing means.
[0016]
Further, as shown in FIG. 6, an initial position return means / oil damper 7 is provided on the side facing the restraining means 6 to return the crane structure 3 to the initial position after the end of the earthquake. As shown in FIG. 9, the initial position return means / oil damper 7 is constituted by a hydraulic cylinder 19, and the cylinder portion 20 is attached to a bracket 22 ′ fixed to the upper surface of the traveling device 2, and the piston rod portion 21. Is attached to a bracket 22 fixed to the lower surface of the crane structure 3.
[0017]
The crane 1 normally performs a cargo handling operation in a state where the crane structure 3 is restrained by the restraining means 6. When an earthquake occurs during the operation and a restraint releasing means attached to the restraining means 6, that is, when a stress greater than the design value is applied to the shear pin or the pull pin 18, the shear pin or the pull pin 18 breaks and the crane structure The restraint of the object 3 is released. Then, the crane structure 3 is seismically isolated by the seismic isolation action of the vibration isolator 4 and the initial position return means / oil damper 7.
[0018]
After the end of the earthquake, the seismic isolation device 4 deformed as shown in FIG. 10 is returned to the initial state by the hydraulic cylinder 19 of the initial position return means / oil damper 7. Thereafter, the connecting plate 15 of the short piece portion and the long piece portion 17 of the link 14 constituting the restraining means 6 are coupled to each other by a new shear pin or pulling pin 18 to restrain the crane structure 3.
[0019]
As described above, the present invention includes the laminated rubber type seismic isolation device 4 between the traveling device 2 and the crane structure 3, the lift prevention means 5 for preventing the crane structure 3 from lifting, and the crane structure 3 during operation. Since the restraint means 6 for restraining the horizontal movement of the crane and the restraint release means 18 for releasing the restraint of the crane structure 3 when an earthquake occurs, the rigidity of the crane can be ensured by the restraint means 6 during operation. .
[0020]
On the other hand, when an earthquake occurs, the restraint release means 18 releases the restraint means 6 so that the crane can be isolated by the laminated rubber type seismic isolation device 4 and the initial position return means / oil damper 7.
[0021]
Further, in the present invention, since the lifting prevention means 5 can prevent the laminated rubber-type seismic isolation device 4 from rising, the number of laminated rubber-type seismic isolation devices 4 can be selected only by the horizontal spring constant. As a result, the number of laminated rubber type seismic isolation devices 4 used can be minimized, and the seismic isolation device can be made compact.
[0022]
In the above description, the case where the link type restraining means 6 is used has been described. However, as shown in FIG. 11, the hydraulic cylinder 19 which is the initial position return mechanism 7 can also be used as the restraining means.
[0023]
That is, normally, the operation is performed with the hydraulic cylinder 19 locked, and when an earthquake occurs, the pipe relief valve (not shown) provided between the hydraulic cylinder 19 and an oil tank (not shown) is unlocked and hydraulic pressure is released. The cylinder 19 is used as an oil damper. In this case, in addition to the above advantages, the number of parts can be reduced. Other configurations are the same as those of the crane 1 already described, and thus the same reference numerals are assigned to the same components and detailed description thereof is omitted.
[0024]
On the other hand, when the push-bolt type initial position return mechanism 7 'shown in FIG. 14 is used instead of the initial position return mechanism / oil damper 7, the initial position return mechanism / oil damper 7 can be used only for the oil damper.
[0025]
As shown in FIG. 14, the push bolt type initial position return mechanism 7 ′ is configured by a pressing portion 24 fixed to the lower surface of the crane structure 3 and pressing bolts 25 and 26 arranged on both sides of the pressing portion 24. Has been. One push bolt 25 is screwed to a support 27 fixed to the upper surface of the traveling device 2, and the other one push bolt 26 is screwed to a support 28 fixed to the upper surface of the traveling device 2. Yes.
[0026]
After the end of the earthquake, one of the push bolts 25 (so that the distance L1 between the pressing part 24 and the support 27 and the distance L2 between the pressing part 24 and the support 28 are the same. 26) is operated to return the crane structure 3 to the initial position.
[0027]
Other configurations are the same as those of the crane 1 already described, and thus the same reference numerals are assigned to the same components and detailed description thereof is omitted.
[0028]
The crane 1 is configured to prevent the crane structure 3 from being lifted by a pair of left and right mechanical link mechanisms 8, 8. However, as shown in FIGS. 15 and 16, the crane 1 is provided on the upper surface of the traveling device 2. The crane structure 3 can be prevented from being lifted by the T-shaped bracket 31 and the left and right idle rollers 32 and 32 engaged with the T-shaped bracket 31. The idler roller 32 is rotatably provided on a bracket 33 fixed to the lower surface of the crane structure 3.
[0029]
3 and 4, the traveling device 2 in FIGS. 5 to 16 is regarded as the lower block 35 of the crane structure 3, and the crane structure 3 is connected to the upper block 36 of the crane structure 3. Shall be considered.
[0030]
【The invention's effect】
As described above, according to the present invention, the rigidity of the crane can be ensured by the restraining means during the cargo handling operation.
[0031]
On the other hand, when an earthquake occurs, the restraining means is released by the restraining release means, and the crane can be isolated by the laminated rubber type seismic isolation device and the initial position return means / oil damper.
[0032]
Further, according to the present invention, since the lifting of the laminated rubber type seismic isolation device can be prevented by the lifting prevention means, the number of laminated rubber type seismic isolation devices can be selected only by the horizontal spring constant. As a result, the number of laminated rubber type seismic isolation devices used can be minimized, and the seismic isolation device can be made compact.
[0033]
Further, when the initial position returning means / oil damper is applied to the restraining means, the link-type restraining means can be omitted, and the number of parts can be reduced.
[0034]
If a push bolt type initial position return means is installed instead of the hydraulic type initial position return means, the hydraulic initial position return means can be applied to the oil damper.
[Brief description of the drawings]
FIG. 1 is a front view showing a first embodiment of a crane according to the present invention.
FIG. 2 is a side view of the crane.
FIG. 3 is a front view showing a second embodiment of the crane according to the present invention.
FIG. 4 is a side view of the crane.
FIG. 5 is an enlarged side view of a main part including a partial cross section of basic seismic isolation means.
6 is a cross-sectional view taken along line XX in FIG.
7 is a cross-sectional view taken along the line AA in FIG.
8 is a cross-sectional view taken along the line BB in FIG.
FIG. 9 is a front view of the initial position return means / oil damper.
FIG. 10 is an explanatory diagram of the action of the lifting prevention means.
FIG. 11 is an enlarged side view including a partial cross section showing a modified example of the seismic isolation means.
FIG. 12 is an enlarged side view including a partial cross section showing another modification of the seismic isolation means.
13 is a cross-sectional view taken along line XX in FIG.
14 is a cross-sectional view taken along the line CC of FIG.
FIG. 15 is a front view showing another example of the floating prevention means.
16 is a cross-sectional view taken along line XX in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,40 Crane 2 Traveling device 3 Crane structure 4 Laminated rubber type seismic isolation device 5 Lift prevention means 6 Restraint means 18 Restraint release means

Claims (3)

Seismic isolation means is provided between the traveling device and the crane structure, and the seismic isolation means includes a laminated rubber type seismic isolation device, a lift prevention means for preventing the crane structure from being lifted, and the crane structure during operation. In a crane comprising restraint means for restraining horizontal movement and restraint release means for releasing restraint of the crane structure when an earthquake occurs,
The lift prevention means includes a shaft provided on the crane block or the upper block side of the crane structure, a shaft provided on the lower block side of the traveling device or the crane structure, and a link held by both shafts. Configure
The restraining means is composed of two sets of links bridged in an X shape between the shafts of the lifting prevention means, and two members constituting each link of the restraining means are connected by the restraining release means. A crane characterized by. The crane according to claim 1, wherein the restraining means is provided with a restraining release means comprising a pin that is broken by an earthquake force greater than a design value . The crane according to claim 1, further comprising an initial position return means comprising a hydraulic cylinder or a push bolt between the traveling device and the crane structure or between upper and lower blocks of the crane structure .

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