JP2014172734A - Seismic isolator of travel crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent, with a simple constitution, a wheel floating phenomenon and derailment problem of swinging in a right-angled direction to a rail caused in a travel crane when a large-scale earthquake is caused.SOLUTION: A seismic isolator comprises rise allowable mechanisms 10a and 10b having: a pair of rotary members 11a and 11b with upper parts longitudinally rotatably installed by first pins 13a and 13b on the front side and the rear side of a large-sized equalizer beam 4; second pins 16 and 17 for rotatably installing lower parts of the rotary members 11a and 11b on the front side or the rear side of respective intermediate type equalizer beams 5a and 5b in a position dislocated in the longitudinal direction to the first pins 13a and 13b; and load receiving means 22a and 22b for transmitting a load acting on the large-sized equalizer beam 4 from a support leg 100 to the intermediate type equalizer beams 5a and 5b by abutting on upper side abutting parts 18 and 20 and lower side abutting parts 19 and 21 provided between the rotary members 11a and 11b and the intermediate type equalizer beams 5a and 5b.

Description

  The present invention relates to a traveling crane used in a harbor or the like, and a problem that a wheel of a traveling device is lifted and a wheel is removed due to the lifting of the wheel when a swing in the direction perpendicular to the rail acts on the traveling crane due to an earthquake. The present invention relates to a seismic isolation device for a traveling crane that can be prevented by a simple configuration. In addition, although the traveling crane in the present invention includes a container crane provided in a harbor, the present invention is not limited to this, and various traveling cranes that have a portal structure and travel on a rail can be used. This is the case.

  A container crane, which is an example of a traveling crane, has a crane main body with supporting legs formed in a gate shape, and along a rail provided on a quay or the like by a traveling device provided on the supporting legs provided at the four corners of the crane main body. And run.

  When an earthquake occurs in such a traveling crane, vibrations in a direction parallel to the traveling direction of the traveling crane can be handled by the traveling device moving on the rail. On the other hand, the load caused by the swing of the traveling crane in the direction perpendicular to the traveling direction acts on the traveling crane as an external force. The crane body that constitutes the traveling crane is configured to the required strength, so even if a small earthquake occurs and a load perpendicular to the traveling direction acts, the crane body deforms flexibly and saves energy. It absorbs and damps the swing, so it doesn't cause a big problem.

  However, when a large earthquake occurs and a large load in the direction perpendicular to the traveling direction of the traveling crane is applied, the support leg rises due to the crane swinging greatly, and after the wheels are lifted from the rail, There is a possibility that the lifted wheel may cause a wheel-out to land outside without returning to the rail. For this reason, it is required to prevent this problem.

  In order to cope with such a problem, as a conventional traveling crane, a seismic isolation device installed between the lower equalizer beam and the upper equalizer beam of the traveling device is provided on the lower equalizer beam and extends along the upper equalizer beam. There is one constituted by a sliding part that slides in the vertical direction, a hydraulic mechanism having a damping element including a hydraulic cylinder provided between the lower equalizer beam and the upper equalizer beam, and a control part of the hydraulic mechanism. (See Patent Document 1).

JP 2007-284230 A

  However, the seismic isolation device of Patent Literature 1 has a problem that the structure becomes large and a control device for controlling the hydraulic mechanism may be required, and the structure for seismic isolation is complicated and expensive. .

  The present invention has been made in view of the above-described conventional problems, and when a large-scale earthquake occurs and a load due to a swing in a direction perpendicular to the rail acts on the traveling crane, the support legs rise and the wheels An object of the present invention is to provide a seismic isolation device for a traveling crane that can prevent problems such as lifting and derailment with a simple structure at low cost.

The present invention includes an upper equalizer beam in which an intermediate portion is attached to a lower portion of a support leg of a crane body traveling on a rail so that the front and rear ends of the crane body can swing up and down, and the upper equalizer beam. A traveling device having at least one stage of an equalizer device including a pair of lower equalizer beams disposed on the front side and the rear side, and having wheels on the front side and the rear side of the lowermost equalizer beam; A seismic isolation device for a traveling crane equipped with a rising allowance mechanism in one equalizer device,
The rising allowance mechanism is:
A pair of rotating members attached to the front side and the rear side of the upper equalizer beam so that the upper part can be rotated back and forth by a first pin;
A second pin attached to the front side or the rear side of each lower equalizer beam at a position displaced in the front-rear direction with respect to the first pin, the lower part of the rotating member;
The upper and lower abutting portions provided between the rotating member and the lower equalizer beam or between the upper equalizer beam and the lower equalizer beam abut against the upper equalizer beam from the support leg. Load receiving means for transmitting a load to be transmitted to the lower equalizer beam,
When the support leg is raised, the rotating member rotates so that the upper contact portion and the lower contact portion of the load receiving means are separated from each other, and the second pin comes close to the first pin. Accordingly, the present invention relates to a seismic isolation device for a traveling crane, characterized in that the lowermost equalizer beam wheel moves on the rail.

  In the seismic isolation device for the traveling crane, an upper contact portion and a lower contact portion of the load receiving means are provided between the rotating member and the lower equalizer beam or between the upper equalizer beam and the lower equalizer beam. It is preferable to provide an impact force mitigating means for mitigating the impact force when coming into contact again from the separated state.

  In the above-mentioned seismic isolation device for a traveling crane, the impact force relaxation means reduces the impact force by compressing fluid when the separated upper contact portion and lower contact portion come into close contact again. A fluid pressure damper is preferred.

  According to the seismic isolation device for a traveling crane of the present invention, even if the support leg is raised, it is possible to obtain an excellent effect that the problem of the wheel lifting and the problem of wheel removal can be prevented at a low cost with a simple configuration.

(A) is a side view which shows one Example of the support leg of the traveling crane which applies this invention, and the raise allowance mechanism in this invention, (b) is a side view which shows the action | operation when a support leg raises. (A) is the top view which looked at Fig.1 (a) from the IIA-IIA direction, (b) is the rear view which looked at Fig.1 (a) from the IIB-IIB direction. It is a side view which shows the structural example similar to FIG. It is a side view which shows the structural example at the time of making a rotation member into a rectangle. (A) is a side view which shows the other Example of the raise permission mechanism in this invention, (b) is a side view which shows the action | operation when a support leg raises. (A) is the side view which shows the Example which provided the impact force mitigation means in the raise permission mechanism in this invention, (b) is the rear view which looked at (a) from VIB-VIB direction, (c) is impact force relaxation. It is sectional drawing of the fluid pressure damper as a means. It is a side view which shows the Example which changed the installation position of the fluid pressure damper. It is a side view which shows another Example which changed the installation position of the fluid pressure damper. (A) is a side view which shows another Example which changed the installation position of the fluid pressure damper, (b) is a side view which shows the action | operation when a support leg raises.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 and FIG. 2 show an embodiment of a supporting leg of a traveling crane to which the present invention is applied and a lifting allowance mechanism according to the present invention. The traveling crane has supporting legs 100 at four corners of a portal crane body. (Only one support leg 100 is shown in FIGS. 1 and 2), and a traveling device capable of traveling on the rail 1 by receiving a load acting on the support leg 100 at the lower end of the support leg 100. 101.

  FIG. 1 (a) shows a case of an eight-wheel type traveling device 101 having eight wheels 2 (there may be other than eight wheels). At the lower end of the support leg 100, an intermediate portion of a large equalizer beam 4 (upper equalizer beam) extending forward and backward in the running direction is attached by a rocker pin 3 so that the front and rear ends can swing up and down. Medium-sized equalizer beams 5a and 5b (lower equalizer beams) are arranged at the lower portions of the front end and the rear end of the beam 4, respectively. The large equalizer beam 4 and the medium equalizer beams 5a and 5b constitute a first stage equalizer device 6.

  Further, upper middle portions of the small equalizer beams 8a and 8b (lowermost equalizer beams) are attached to the front and rear lower portions of the front middle-sized equalizer beam 5a by rocker pins 7 and swing back and forth. It is possible. In addition, upper middle portions of the small equalizer beams 8c and 8d (lowermost equalizer beams) are attached by rocker pins 7 to the front and rear lower portions of the other medium-sized equalizer beam 5b so that they can swing back and forth. It has become. Then, the second-stage equalizer device 9 is constituted by the medium-sized equalizer beams 5a and 5b and the small equalizer beams 8a, 8b, 8c and 8d. The wheels 2 that run on the rail 1 are attached to the front and rear sides of the lowermost small equalizer beams 8a, 8b, 8c, and 8d.

  In the embodiment of FIGS. 1 and 2, the first stage equalizer device 6 is provided with the rising allowance mechanisms 10 a and 10 b. The ascending allowance mechanisms 10a and 10b include front and rear rotating members 11a and 11b having, for example, right-angled isosceles triangles on the left and right sides of the large equalizer beam 4 (upper equalizer beam). The pivot members 11a and 11b have apex angle portions 12 having 90 ° attached to the front and rear sides of the large equalizer beam 4 by the first pins 13a and 13b so that they can swing back and forth. Accordingly, a front end portion 14 and a rear end portion 15 each having a bottom corner portion of 45 ° are formed on the front and rear of the lower portions of the front and rear rotating members 11a and 11b.

  Then, the front end portion 14 of the front rotation member 11a is rotatably attached to the front side of the middle-sized equalizer beam 5a (lower equalizer beam) by the second pin 16, and the rear end of the rear rotation member 11b. The end 15 is rotatably attached to the rear side of the middle equalizer beam 5b (lower equalizer beam) by a second pin 17.

  Further, the upper permissible mechanisms 10a and 10b are configured such that the upper contact portion 18 formed by the lower surface of the rear end portion 15 which is the lower side of the rotating member 11a contacts the rear side of the front middle equalizer beam 5a. The lower contact portion 19 is provided. In addition, a lower contact portion 21 is provided so that an upper contact portion 20 formed of a lower surface of the front end portion 14 which is the lower side of the rotating member 11b contacts the front side of the rear middle-sized equalizer beam 5b. ing. Accordingly, when the upper abutting portions 18 and 20 and the lower abutting portions 19 and 21 come into contact with each other, the load transmitted to the large equalizer beam 4 by acting on each support leg 100 from the crane body is medium-sized equalizer beam 5a. , 5b, load receiving means 22a, 22b are configured.

  In the embodiment of FIG. 1, the traveling device 101 including the first-stage equalizer device 6 and the second-stage equalizer device 9 has been described. However, the traveling device 101 includes only the first-stage equalizer device 6. Or three or more stages of equalizer devices may be provided. Further, in the above-described embodiment, the case where the first stage equalizer device 6 is provided with the rise allowance mechanisms 10a and 10b is illustrated, but the rise allowance mechanisms 10a and 10b may be provided in all the equalizer devices. . Further, the rising allowance mechanisms 10a and 10b are one between the middle equalizer beams 5a and 5b (upper equalizer beams) and the small equalizer beams 8a, 8b, 8c and 8d (lower equalizer beams) in the second stage equalizer device 9. Alternatively, only one of the equalizer devices having three or more stages may be provided.

  The above embodiment operates as follows.

  In FIG. 1A, the load acting on each support leg 100 from the crane body is transmitted to the large equalizer beam 4 via the rocker pin 3. Further, the upper pins 18 and 20 and the lower contacts of the first pins 13a and 13b and the second pins 16 and 17 of the rotating members 11a and 11b and the load receiving means 22a and 22b are in contact with each other. 19 and 21 to the medium equalizer beams 5a and 5b. Further, it is transmitted to the lowermost small equalizer beams 8 a, 8 b, 8 c, and 8 d through the rocker pins 7, and is transmitted to the rail 1 through the wheels 2.

  When a large-scale earthquake occurs and a load due to a swing in a direction perpendicular to the rail 1 is applied to the traveling crane, it is conceivable that the support leg 100 behaves ascending.

  When the support leg 100 is lifted, as shown in FIG. 1 (b), the upper contact portions 18 and 20 and the lower contact portions 19 and 21 of the load receiving means 22a and 22b constituting the lift allowance mechanisms 10a and 10b are Get away. At the same time, the first pins 13a and 13b and the second pins 16 and 17 of the rotating members 11a and 11b connect the large equalizer beam 4 and the medium equalizer beams 5a and 5b at positions shifted forward and backward. The middle equalizer beams 5a and 5b are pulled and moved so that the second pins 16 and 17 come close to the pins 13a and 13b, and the rotating members 11a and 11b rotate. As a result, as shown by the arrow X, the medium equalizer beams 5a and 5b move in directions toward each other.

  The height H that changes as the second pins 16 and 17 shown in FIG. 1A move directly below the first pins 13a and 13b as shown in FIG. The rotating members 11a and 11b are designed so as to be equal to or greater than the maximum height expected to rise. As a result, the wheel 2 provided on the lowermost small equalizer beams 8a, 8b, 8c, 8d is always held on the rail 1 even when the support leg 100 is lifted. The problem of rolling is reliably prevented. Here, when the maximum value of the height at which the support leg 100 rises due to a large-scale earthquake is predicted to be, for example, 15 cm, the second pins 16 and 17 are moved by the rotation of the rotation members 11a and 11b. The rotating members 11a and 11b may be designed so that the height H at which the 1 pins 13a and 13b rise is slightly larger than 15 cm.

  FIG. 3 shows a configuration example similar to the above-described embodiment. In this configuration example, the rear end portion 15 of the front rotating member 11a is connected to the second pin 16 with respect to the rear side of the medium equalizer beam 5a. And a lower contact portion 19 with which the upper contact portion 18 of the front end portion 14 of the front rotating member 11a contacts is provided on the front side of the medium equalizer beam 5a. Further, the front end portion 14 of the rear rotating member 11b is connected to the front side of the medium equalizer beam 5b by the second pin 17, and the upper contact portion 20 of the rear end portion 15 of the rear rotating member 11b. Is provided on the rear side of the middle equalizer beam 5a.

  In the configuration example of FIG. 3, when the support leg 100 is raised due to the occurrence of a large-scale earthquake, the medium-sized equalizer beams 5 a and 5 b are pulled by the second pins 16 and 17, as indicated by an arrow Y. , Move away from each other. This configuration example can also operate in the same manner as in the previous embodiment.

  FIG. 4 shows a configuration example in the case where rectangular rotating members 11a ′ and 11b ′ are used instead of the front and rear rotating members 11a and 11b having right-angled isosceles triangles. The configuration example of FIG. 4 can also operate in the same manner as in the above embodiment. In addition to the right-angled isosceles triangular rotating members 11a and 11b or the rectangular rotating members 11a ′ and 11b ′, the second pins 16 and 17 are arranged on one side of the front and rear, If the upper contact portions 18 and 20 can be provided on the other side, those having various shapes can be used.

  FIG. 5 shows another embodiment of the lifting allowance mechanisms 10a and 10b according to the present invention. In FIG. 5, instead of the rotating members 11a and 11b having the right isosceles triangle, a link-like rotating member is used. The case where 23a and 23b are provided is shown. In the case of the link-like rotating members 23a and 23b, the load receiving means 22a and 22b cannot be provided between the rotating members 23a and 23b and the medium-sized equalizer beams 5a and 5b. For this reason, in the embodiment shown in FIG. 5, the load receiving unit is configured such that the upper contact portion 18 on the front lower surface of the front middle equalizer beam 5a directly contacts the lower contact portion 19 on the upper surface of the middle equalizer beam 5b. The means 22a is comprised. Further, the load receiving means 22b is configured such that the upper contact portion 20 on the rear lower surface of the rear middle equalizer beam 5b directly contacts the lower contact portion 21 on the upper surface of the middle equalizer beam 5b. Yes.

  In the embodiment of FIG. 5, the upper contact portions 18 and 20 on the lower surface of the middle equalizer beam 5a act on the support leg 100 by contacting the lower contact portions 19 and 21 on the upper surface of the middle equalizer beam 5b. Since the load is transmitted to the medium-sized equalizer beams 5a and 5b, it is possible to operate in the same manner as in the above-described embodiment, and it is possible to greatly simplify the configuration of the ascending allowance mechanisms 10a and 10b.

  6 again shows the traveling device 101 having the allowance mechanisms 10a and 10b in FIG. 1 after the upper contact portions 18 and 20 of the load receiving means 22a and 22b are separated from the lower contact portions 19 and 21. An embodiment is shown in which impact force mitigating means 24 for mitigating the impact force at the time of contact is provided. 6 (a) and 6 (b) show a case where an impact force relaxation means 24 is provided between the rotating members 11a and 11b and the medium-sized equalizer beams 5a and 5b.

  FIG. 6C shows the case of a fluid pressure damper 25 which is an example of the impact force relaxation means 24. The fluid pressure damper 25 has a piston 28 inside a cylinder 27 having a rotatable connecting tool 26 at one end, and a rotatable connecting tool at the other end of a piston rod 29 fixed to the piston 28. 30 is provided. The piston 28 is provided with a communication hole 31 for communicating the first chamber 27 a and the second chamber 27 b of the cylinder 27, and a check valve 33 urged by a spring 32 is provided in the communication hole 31. . Further, the cylinder 27 is provided with a flow path 34 that connects the ends of the first chamber 27a and the second chamber 27b on the far side, and a cross-sectional area of the flow path 34 is provided in the middle of the flow path 34. A flow path adjuster 36 having a throttle part 35 to be changed is provided.

  The fluid pressure damper 25 in FIG. 6C is configured so that when the piston rod 29 moves in the direction a and the cylinder 27 extends, the check valve 33 opens the communication hole 31 against the spring 32. The oil in the second chamber 27b can flow into the first chamber 27a through the communication hole 31, so that the cylinder 27 can freely expand.

  On the other hand, when the piston rod 29 moves in the direction b and the cylinder 27 contracts, the check valve 33 closes the communication hole 31 by the spring 32, so that the oil in the first chamber 27 a passes through the communication hole 31 to the second chamber. 27b, the oil in the first chamber 27a flows into the flow path 34, but the cross-sectional area is reduced in the middle of the flow path 34 by the throttle portion 35 by the flow path adjuster 36. The oil in the first chamber 27a slowly flows into the second chamber 27b. Accordingly, since the fluid pressure damper 25 generates a large resistance force when being reduced, the upper contact portions 18 and 20 separated from the lower contact portions 19 and 21 again become the lower contact portions 19 and 21. The impact force when coming into contact with the fluid is reduced by the fluid pressure damper 25.

  As shown in FIG. 6, instead of the case where the fluid pressure damper 25 is provided between the rotating members 11a and 11b and the medium equalizer beams 5a and 5b, as shown in FIG. The case where the fluid pressure damper 25 is provided between the equalizer beam 4 is shown.

  FIG. 8 shows a case where a fluid pressure damper 25 is provided between the upper large equalizer beam 4 and the middle equalizer beams 5a and 5b. The configuration shown in FIG. 8 can also be applied to an embodiment in which the upper large equalizer beam 4 is in direct contact with the middle equalizer beams 5a and 5b as shown in FIG.

  FIG. 9 shows an embodiment in which the fluid pressure damper 25 is provided so as to connect the rear end portion 15 of the front rotation member 11a shown in FIG. 1 and the front end portion 14 of the rear rotation member 11b. An example is shown.

  In the embodiment of FIG. 9, when the support leg 100 is lifted from the state (a) as shown in (b), the rear end portion 15 of the front turning member 11a and the front end of the rear turning member 11b. When the support leg 100 is lowered and the upper contact portions 18 and 20 of the rotating members 11a and 11b are brought into contact with the lower contact portions 19 and 21, the interval is reduced. Becomes bigger. Therefore, in the embodiment of FIG. 9, in the fluid pressure damper 25 shown in FIG. 6C, when the cylinder 27 in which the piston rod 29 moves in the direction a is extended, the throttle effect of the throttle portion 35 by the flow path adjuster 36 is increased. In order to operate, the check valve 33 having a reverse direction is used. Thereby, also in the case of FIG. 9, the buffer effect similar to the said Example can be exhibited.

  Although the case of the fluid pressure damper 25 shown in FIG. 6C has been described as the impact force relaxation means 24, the upper contact portions 18, 20 and the lower contact portions 19, 21 of the load receiving means 22a, 22b. Various methods and configurations can be used as long as the impact force at the time of contact from the separated state can be reduced.

  As described above, according to the seismic isolation device for a traveling crane of the present invention, even if a large-scale earthquake causes a load due to a swing in the direction perpendicular to the rail 1 to act on the crane body, the support leg 100 rises. The upper contact portions 18 and 20 and the lower contact portions 19 and 21 of the load receiving means 22a and 22b constituting the 10a and 10b are separated from each other, and further, the rotating members 11a and 11b constituting the lifting allowance mechanisms 10a and 10b. , 11a ′, 11b ′, 23a, 23b only rotate to move the middle-sized equalizer beams 5a, 5b in the front-rear direction, and the wheels 2 of the lower-stage small equalizer beams 8a, 8b, 8c, 8d are rails 1 Since it is held on, the problem that the wheel 2 is lifted up or the wheel is removed can be prevented with a simple configuration.

  The load receiving means 22a, 22b further includes an impact force relaxation means 24 for reducing the impact force when the upper contact portions 18, 20 and the lower contact portions 19, 21 come into contact again from a separated state. Thus, the impact force generated on the traveling crane due to the earthquake can be reduced.

  Further, the impact force relaxation means 24 compresses the fluid when the separated upper contact portions 18 and 20 and the lower contact portions 19 and 21 come into close contact with each other, thereby reducing the impact force. Since the damper 25 is used, a large impact force can be reduced with a simple and inexpensive configuration.

  The seismic isolation device for a traveling crane of the present invention is not limited only to the above-described embodiments, and the shape of the rotating member is not limited to the illustrated example, and does not depart from the gist of the present invention. Of course, various changes can be made within the range.

1 Rail 2 Wheel 4 Large equalizer beam (upper equalizer beam)
5a, 5b Medium equalizer beam (lower equalizer beam)
6 Equalizer device 8a, 8b, 8c, 8d Small equalizer beam 9 Equalizer device 10a, 10b Allowable lifting mechanism 11a, 11b Rotating member 11a ', 11b' Rotating member 13a, 13b First pin 16, 17 Second pin 18 Upper side Contact part 19 Lower contact part 20 Upper contact part 21 Lower contact part 22a, 22b Load receiving means 23a, 23b Rotating member 24 Impact force reducing means 25 Fluid pressure damper (impact force relaxing means)
100 Support Leg 101 Traveling Device

Claims (3)

An upper equalizer beam with an intermediate part attached to the lower part of the supporting legs of the crane body that runs on the rails so that the front and rear ends can swing up and down in the running direction, and the front and rear sides of the upper equalizer beam A traveling device having at least one stage of an equalizer device including a pair of lower equalizer beams arranged on the front and having wheels on the front side and the rear side of the lowermost equalizer beam, and at least one equalizer device of the traveling device And a seismic isolation device for a traveling crane equipped with a lifting allowance mechanism,
The rising allowance mechanism is:
A pair of rotating members attached to the front side and the rear side of the upper equalizer beam so that the upper part can be rotated back and forth by a first pin;
A second pin attached to the front side or the rear side of each lower equalizer beam at a position displaced in the front-rear direction with respect to the first pin, the lower part of the rotating member;
The upper and lower abutting portions provided between the rotating member and the lower equalizer beam or between the upper equalizer beam and the lower equalizer beam abut against the upper equalizer beam from the support leg. Load receiving means for transmitting a load to be transmitted to the lower equalizer beam,
When the support leg is raised, the rotating member rotates so that the upper contact portion and the lower contact portion of the load receiving means are separated from each other, and the second pin comes close to the first pin. The traveling crane's seismic isolation device is characterized in that the lowermost equalizer beam wheel moves on the rail.   When the upper contact portion and the lower contact portion of the load receiving means are in contact again from the separated state between the rotating member and the lower equalizer beam, or between the upper equalizer beam and the lower equalizer beam. The seismic isolation device for a traveling crane according to claim 1, further comprising impact force relaxation means for reducing the impact force.   The impact force relaxation means is a fluid pressure damper that relieves an impact force by compressing fluid when the separated upper contact portion and lower contact portion come into close contact with each other again. Item 3. A seismic isolation device for a traveling crane according to item 2.

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