JP2013082524A - Seismic isolation support device for traveling crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wheels lifted and derailing phenomena due to shaking of a traveling crane in a direction perpendicular to the rails when a large earthquake occurs, with a simple configuration.SOLUTION: A link device 13 is provided in place of at least one of equalizer beams 4, 6a, 6b, 8a, 8b, 8c, and 8d. The link device includes: a pair of links 10 and 11 having upper edges 10a and 11a suspended from a supporting leg 101 by means of a rocker pin 3, and sliding edges 10b and 11b slidable in a traveling direction of a traveling device 102; and a stopper unit 12 which defines a maximum divergence angle α between the sliding edges 10b and 11b of one link 10 and other link 11 when a load is applied by the supporting leg 101.

Description

  In the traveling crane used in the harbor portion or the like, when a huge earthquake occurs, the traveling crane generates a swing in a direction perpendicular to the rail, and the problem that the wheel is lifted and derails, The present invention relates to a seismic isolation support device for a traveling crane that can be prevented with a simple configuration. The traveling crane in the present invention includes a large container crane provided in a harbor, but is not limited thereto, and may be various traveling cranes that have a portal structure and travel on a rail. 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 travels along rails provided on the quay by a traveling device provided at the four corners of the supporting legs of the crane main body. To do.

  When an earthquake occurs in such a traveling crane, an exciting force perpendicular to the traveling direction of the traveling crane acts on the traveling crane as an external force. The crane body that constitutes a traveling crane has flexibility, and even if a small-scale or medium-scale earthquake occurs and an excitation force in a direction perpendicular to the traveling direction acts, the crane body deforms flexibly. By doing so, the vibration force is absorbed, so there is no problem.

  However, when a large-scale earthquake occurs, the crane is greatly shaken and the support legs are lifted, which may cause the wheels to be removed from the rails.

  In order to deal with such problems, it has been proposed that conventional traveling cranes have various seismic isolation structures. For example, a seismic isolation device is provided between a lower equalizer beam and an upper equalizer beam. The seismic isolation device includes a sliding portion that is provided in the lower equalizer beam and slides vertically along the upper equalizer beam, and a lower equalizer. There is one constituted by a hydraulic mechanism having a damping element including a hydraulic cylinder provided between the beam and the upper equalizer beam, and a control unit of the hydraulic mechanism (see Patent Document 1).

JP 2007-284230 A

  However, the seismic isolation device of Patent Document 1 has a problem that the structure is large and a control device for controlling the hydraulic mechanism is 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 huge earthquake occurs, the traveling crane generates a swing in a direction perpendicular to the rails, and the support legs are lifted to cause the wheel to be removed. An object of the present invention is to provide a seismic isolation support device for a traveling crane that can be prevented by a simple configuration.

  The present invention is a seismic isolation support structure for a traveling crane in which a traveling device having at least one equalizer beam suspended from an upper member by a rocker pin is provided on a supporting leg and travels on a rail, and one end of the traveling device A pair of links that are suspended from the upper member by a rocker pin and whose swing ends can swing in the travel direction of the travel device, and swing ends of one link and the other link when a load is applied by the upper member The present invention relates to a seismic isolation support device for a traveling crane, characterized in that a link device having stopper means for defining a mutual maximum opening angle is provided by replacing at least one of the equalizer beams.

  In the above-described seismic isolation support device for a traveling crane, the stopper means may be abutting members that abut against each other in preparation for upper extensions of the links.

  Further, in the above-described seismic isolation support device for a traveling crane, the stopper means may be a bendable connecting member that connects the rocking ends of the links to each other.

  In the above-described base isolation device for a traveling crane, it is preferable that spring means for urging the swing ends in a direction to approach each other is provided between the links.

  In the above-mentioned seismic isolation support device for a traveling crane, it is preferable that a damper device that exerts a resistance force when the swing end is opened is provided between the links.

  Further, in the seismic isolation support device for the traveling crane, a shear plate is provided between the upper member and the links to prevent the links from being inclined inward between the rails with respect to the upper member. Is preferred.

  According to the seismic isolation support device for a traveling crane of the present invention, even if a swing in the direction perpendicular to the rail occurs in the crane main body and the support leg is lifted, the swing ends of one link and the other link An excellent effect of preventing the opening angle from decreasing and the wheel from separating from the rail can be obtained.

It is a side view which shows one Example of the seismic isolation support apparatus with which the traveling crane of this invention is equipped. It is a front view which shows the detail which looked at the link apparatus of FIG. 1 from the II-II direction. It is a side view which shows the action | operation of a link apparatus at the time of the phenomenon which a crane body generate | occur | produces a right angle direction and the support leg floats up. It is a side view which shows the other Example of the seismic isolation support apparatus with which the traveling crane of this invention is equipped. It is a front view which shows the state which the vibration of a perpendicular direction with a rail generate | occur | produces in a crane main body.

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

  FIG. 1 shows a traveling device 102 provided at the lower part of the four corners of a support leg 101 in a portal crane body 100 constituting a traveling crane. This traveling device 102 is known to have a large number of wheels 2 that are even or odd in accordance with quay conditions for traveling back and forth on the rail 1.

  FIG. 1 shows the case of an eight-wheel type traveling device 102 having eight wheels 2. In this traveling device 102, the lower part of the supporting leg 101 of the crane main body 100 is usually orthogonal to the rail 1 and horizontally. A large upper equalizer beam 4 is swingably attached back and forth via a rocker pin 3 extending in the direction, and a middle intermediate portion is interposed between the front end and the rear end of the upper equalizer beam 4 via a rocker pin 5. Equalizer beams 6a and 6b are attached so as to be able to swing back and forth. Further, small lower equalizer beams 8a and 8b are attached to the front end and the rear end of one intermediate equalizer beam 6a via rocker pins 7 in front and rear. A small lower equalizer beam 8c is attached to the lower part of the front end and the rear end of the other intermediate equalizer beam 6b via a rocker pin 7. 8d is is attached swingably back and forth, each lower equalizer beams 8a, 8b, 8c, before and after each of 8d, the wheel 2 is attached to travel on the rail 1.

  In the traveling device 102 of FIG. 1, an extension portion 9 extending downward for arranging the rocker pin 3 as shown in FIG. 2 is provided on the lower surface of the support leg 101 of the crane body 100 as an upper member. The upper equalizer beam 4 is disposed inside the extensions 9, 9 at a right angle.

  Here, in the present invention, instead of the upper equalizer beam 4, a pair of links 10 and 11 that can swing separately with respect to the rocker pin 3 are provided. Each link 10, 11 has one end 10a, 11a (upper end) pivotally supported by the rocker pin 3, and the other end (lower end) of the rocker end 10b, 11b has a rocker pin. 5, intermediate equalizer beams 6 a and 6 b are pivotally supported. Here, FIG. 1 shows the case where one end 10a, 11a of each link 10, 11 is pivotally supported by one rocker pin 3, but two parallel rocker pins 3 are provided and each rocker pin 3 is provided. The links 10 and 11 may be separately pivoted in each of the three.

  Between the links 10 and 11, stopper means 12 is provided for defining a maximum opening angle α when the swinging ends 10b and 11b open back and forth by the action of the load of the crane body 100. . The links 10 and 11 and the stopper means 12 constitute a link device 13 that is replaced with the upper equalizer beam 4.

  As shown in FIGS. 1 and 2, the stopper means 12 is formed with upper extensions 14 and 15 extending upward from the rocker pins 3 at one ends 10a and 11a of the links 10 and 11, respectively. The contact members 16 and 17 are fixed to the opposing surfaces of the extension portions 14 and 15, and the contact members 16 and 17 contact each other, whereby the maximum opening angle of the rocking ends 10b and 11b of the links 10 and 11 is obtained. α is defined so that it cannot be opened beyond the maximum opening angle α.

  Further, a tension spring 18 (spring means) urged so as to attract and bring the swinging ends 10b and 11b closer to each other is provided between the swinging ends 10b and 11b of the links 10 and 11. Yes. At this time, instead of the tension spring 18, a compression spring or a leaf spring may be provided between the upper extensions 14 and 15 so as to push the upper extensions 14 and 15 together. Good.

  Further, a damper device 19 is provided between the upper extensions 14 and 15 of the links 10 and 11 to exert a resistance force when the swinging ends 10b and 11b are opened. The damper device 19 may be provided between the rocking ends 10b and 11b of the links 10 and 11. The damper device 19 can be a fluid pressure cylinder having a check valve. That is, when operating in the direction in which the opening angle of the rocking ends 10b and 11b decreases, the check valve can be freely rotated by opening, and conversely, the opening angle of the rocking ends 10b and 11b. When the valve is actuated to increase, the check valve is closed, and the damper flows by exerting a fluid flow through the small opening provided in the fluid pressure cylinder and slowly increasing the opening angle.

  Further, as shown in FIG. 2, around the rocker pin 3 between the extensions 9 and 9 provided on the crane body 100 which is the upper member and the outside of the one ends 10a and 11a of the links 10 and 11, A shear plate 20 for preventing the links 10 and 11 from tilting inward between the rails 1 and 1 with respect to the extensions 9 and 9 when the support leg 101 is lifted and the rocker pin 3 is tilted. And when the support leg 101 is lifted and the rocker pin 3 is tilted between the extensions 9 and 9 and the upper extensions 14 and 15 provided in the links 10 and 11, A shear plate 21 is provided to prevent the links 10 and 11 from inclining inward between the rails 1 and 1 with respect to the extensions 9 and 9.

  FIG. 4 shows another embodiment of the present invention. In the embodiment of FIG. 4, the swinging ends 10b, 11b of the links 10, 11 are connected by a tension spring 18 (spring means). At the same time, the swinging ends 10b and 11b are connected to each other by a damper device 19 disposed at a position overlapping the tension spring 18 in a direction perpendicular to the paper surface.

  Further, stopper means 12 is provided between the rocking ends 10b and 11b of the links 10 and 11 by a connecting member 22 that can be bent. FIG. 4 shows a case where two connecting members 22a and 22b are provided, and one end of one connecting member 22a is provided with a connecting ring 23a fitted to the rocker pin 5 provided on the rocking end 10b. One end of the other connecting member 22b is provided with a connecting ring 23b fitted to the rocker pin 5 provided at the swing end 10b, and the other ends of the connecting members 22a and 22b can be turned up and down by the connecting pin 24. It is linked to. A chain or the like can be used instead of the connecting member 22.

  In the above embodiment, the case where the link device 13 of the present invention is applied to the upper equalizer beam 4 is illustrated, but the intermediate equalizer beams 6a and 6b attached to the upper equalizer beam 4 which is the upper member, and The present invention can also be applied to the lower equalizer beams 8a, 8b, 8c, and 8d that are attached to the middle equalizer beams 6a and 6b that are upper members. The link device 13 may be replaced with at least one of the equalizer beams 4, 6a, 6b, 8a, 8b, 8c, and 8d.

  Next, the operation of the above embodiment will be described.

  FIG. 1 shows a state in which the traveling device 102 receives the load of the crane body 100. At this time, the contact members 16 and 17 constituting the stopper means 12 come into contact with each other, so that the links 10 and 11 swing. The distance between the ends 10b and 11b is defined as the maximum opening angle α, and the load of the crane body 100 applied to the traveling device 102 is equally distributed to the eight wheels 2. Further, the tension spring 18 (spring means) provided between the swinging ends 10b and 11b is in an extended state, and the damper device 19 provided between the upper extension portions 14 and 15 is reduced. Is in a state.

  As shown in FIG. 5, when the ground on which the crane main body 100 is installed vibrates in a direction intersecting the longitudinal direction of the rail 1 due to an earthquake, the crane main body 100 itself deforms flexibly when the acceleration of vibration is small. However, if there is a huge earthquake that seems to be the strongest in the past and the future in the site where the traveling crane is installed, and the acceleration of the earthquake is large, As the wheel 2 of the support leg 101 and the wheel 2 of the support leg 101 on the land side alternately float from the rail 1, it is assumed that a swing R in the direction perpendicular to the rail 1 occurs in the crane body 100. At the next stage, there is a possibility that a problem occurs that the wheel 2 is shockedly dropped on the rail 1 or the wheel 2 that has lifted off does not return to the rail 1 and falls off. In a large traveling crane, when a swing R in the direction perpendicular to the rail 1 occurs due to a huge earthquake as described above, the lifting height at which the wheel 2 lifts from the rail 1 is expected to be several centimeters. Expected to be about centimeters.

  In the crane main body 100 shown in FIG. 1, as shown in FIG. 5, when a swing R in the direction perpendicular to the rail 1 occurs due to an earthquake and the support leg 101 is going to rise, the one ends 10 a and 11 a of the links 10 and 11 are The rocker is pivotally supported by the support leg 101 via the rocker pin 3, and the weight of the middle equalizer beam 6 a and the lower equalizer beams 8 a and 8 b is applied to the rocking end 10 b of the link 10. In addition, since the load of the intermediate equalizer beam 6b and the lower equalizer beams 8c and 8d is applied to the swing end 11b of the link 11, the links 10 and 11 swing as shown in FIG. The angle between the ends 10b and 11b is automatically reduced as the opening angle α ′. X in FIG. 3 represents the distance that the rocker pin 3 has moved upward as the support leg 101 moves up.

  Further, since the swinging ends 10b and 11b of the links 10 and 11 are attracted by the tension spring 18 (spring means), the angle between the swinging ends 10b and 11b is ensured at the same time as the support leg 101 is lifted. Will be reduced.

  As described above, when the support leg 101 is raised, the links 10 and 11 are automatically rotated so that the angle between the swing ends 10b and 11b is reduced. The height of the attached middle equalizer beams 6a, 6b does not change, only the middle equalizer beams 6a, 6b approach each other, and the wheels 2 of the lower equalizer beams 8a, 8b, 8c, 8d The state of meshing with the rail 1 is maintained, and the wheels 2 are prevented from floating from the rail 1.

  Further, when the acceleration for raising the support leg 101 is large, or when the acceleration for dropping the ground is large, the swinging ends 10b and 11b are attracted by the tension spring 18, so that the support leg 101 is accelerated with a large acceleration. Even if the rail 1 is about to separate, the links 10 and 11 are surely rotated so that the angle between the swinging ends 10b and 11b decreases and the wheel 2 is landed on the rail 1. Since the distance X that allows the rocker pin 3 to move upward can be secured, the wheel 2 can be prevented from separating from the rail 1.

  As described above, even if the crane body 100 is swayed in the direction perpendicular to the rail 1, the wheel 2 is prevented from moving away from the rail 1, so that the wheel 2 does not escape from the rail 1.

  Further, when the support leg 101 is lowered from the state shown in FIG. 3, the angle between the swinging ends 10b and 11b is opened from the reduced opening angle α ′. At this time, the damper device 19 is opened. Since the damper device 19 exhibits a damper function when being reduced, an increase in the opening angle is suppressed by the damper device 19, whereby the support leg 101 is lowered as described above, and the crane body The impact when 100 loads act on the traveling device 102 (at the time of sitting) is buffered. Further, the tension spring 18 attracting between the swinging ends 10b and 11b also works to suppress an increase in the opening angle, so that the action of buffering the impact at the time of sitting is also assisted by the tension spring 18.

  In the embodiment of FIG. 4, the maximum opening angle α is defined between the oscillating ends 10 b and 11 b by the stopper means 12 including the connecting member 22 that connects the oscillating ends 10 b and 11 b. The damper device 19 provided between the oscillating ends 10b and 11b is extended except that the damper device 19 expands due to an increase in opening angle and exhibits a damper function when the damper device 19 extends. It is the same as the embodiment of FIG. 1, and can operate in the same manner as the embodiment of FIG.

  The seismic isolation device by the link device 13 may be provided alone in the traveling crane, but may be provided in combination with a conventionally known seismic isolation structure.

  The seismic isolation support device for a traveling crane of the present invention is not limited to the above-described embodiment, and the shape of the link is not limited to that of the illustrated example, and other ranges that do not depart from the gist of the present invention. Of course, various changes can be made.

1 rail 3 rocker pin 4 upper equalizer beam (equalizer beam)
5 Rocker pins 6a, 6b Equalizer beam (equalizer beam)
7 Rocker pins 8a, 8b, 8c, 8d Lower equalizer beam (equalizer beam)
DESCRIPTION OF SYMBOLS 10, 11 Link 10a, 11a One end 10b, 11b Swing end 12 Stopper means 13 Link apparatus 14,15 Upper extension part 16,17 Contact member 18 Tension spring (spring means)
19 Damper Device 20 Shear Plate 21 Shear Plate 22 Connecting Material 100 Crane Body 101 Supporting Leg 102 Traveling Device α Maximum Opening Angle

Claims (6)

  A traveling device having a traveling leg having at least one equalizer beam suspended from a rocker pin with respect to an upper member and having a support leg traveling on a rail, the one end of which is a rocker from the upper member A pair of links that are suspended by pins and whose swing ends are swingable in the travel direction of the travel device, and the maximum opening of the swing ends of one link and the other link when a load is applied by the upper member. A traveling-base seismic isolation device for a traveling crane, comprising: a link device having a stopper means for defining a corner, wherein the link device is replaced with at least one of the equalizer beams.   2. The seismic isolation support device for a traveling crane according to claim 1, wherein the stopper means is an abutting member that abuts each other in preparation for an upper extension portion of each link.   The seismic isolation support device for a traveling crane according to claim 1, wherein the stopper means is a bendable connecting member that connects the swing ends of the links to each other.   4. The seismic isolation of a traveling crane according to claim 1, further comprising spring means for urging the swinging ends in a direction in which the swinging ends approach each other. Support device.   5. The seismic isolation support device for a traveling crane according to claim 1, further comprising a damper device that exerts a resistance force between the links when the swinging end is opened. .   The shear plate which prevents that each said link inclines to the inner side between rails with respect to the said upper member between the said upper member and each said link was provided. The seismic isolation support device of the traveling crane as described in one.

Images