JP5953256B2 - Quay crane - Google Patents

Description

  The present invention relates to a quay crane used for container handling at a port or an inland container terminal.

  At container terminals such as harbors and inland areas, containers between ships, railways and trailers are handled by quay cranes and portal cranes. If this container terminal is adjacent to the airport, quay cranes may be subject to height restrictions. Therefore, in such a container terminal, a quay crane (hereinafter referred to as a low profile crane or a crane) having a leg structure and a sliding boom (hereinafter referred to as a shuttle boom) is employed.

  FIG. 5 shows an outline of the low profile crane 1X. The crane 1X has a leg structure composed of a sea side leg 11a and a land side leg 11b on the traveling device 13, and a shuttle boom 2 installed so as to be slidable horizontally with respect to the leg structure. . Here, y indicates the transverse direction y of the crane, and z indicates the vertical direction.

  The applicant has already disclosed an invention relating to a structure in which the leg structure supports the shuttle boom 2 in the low profile crane 1X (see Patent Document 1). In FIG. 6, the front enlarged view of the low profile crane 1X described in patent document 1 is shown. The crane 1X has a leg 11 (sea side leg 11a or land side leg 11b) and a leg structure horizontal member 6. The crane 1 </ b> X has a suspension structure 3 that is suspended from a leg structure horizontal member 6 via a support pin 4.

  This suspension structure 3 is formed in a substantially U-shape with the lower end as an open end. Moreover, the suspension structure 3 has the support wheel 5 in the open end below. The suspension structure 3 is configured to be swingable in the traveling direction x of the crane 1X around the support pin 4.

  The shuttle boom 2 is supported by a support wheel 5 installed on the suspension structure 3 so as to be movable in the sea-land direction (the front-rear direction in FIG. 6). Further, the crane 1X includes a cargo handling device (hereinafter referred to as a trolley) 12 that travels along a rail (not shown) formed on the shuttle boom 2. Reference numeral 15 denotes a container being handled.

  With this configuration, the suspension structure 3 of the crane 1 </ b> X is not affected by the deflection of the leg structure 11, so that noise accompanying the movement of the shuttle boom 2 can be prevented. In addition, with the configuration in which the suspension structure 3 can be swung in the traveling direction x (see the arrow in FIG. 6), an effect of facilitating analysis and design related to deformation and the like of the leg structure 11 is obtained.

  However, as a result of the subsequent development by the applicant, it is sometimes desirable to suppress the swing of the suspension structure 3 in the traveling direction x when the low profile crane 1X is operated at an actual container terminal. I found out.

Specifically, it has been found that it is desirable to suppress the swinging of the suspension structure 3 that occurs during traveling of the crane, in order to reduce the stability of the crane. Further, it has been found that it is desirable to suppress the impulsive swing that occurs when the crane is driven to finely adjust the stop position of the crane. Furthermore, it has been found that it is desirable to suppress the fluctuation caused by wind or the like when handling the container. The low profile crane 1X described in Patent Document 1 has a problem that it does not satisfy the above requirements.

JP 2011-251835 A

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a traveling direction x of a suspended structure in a quay crane (low profile crane) that supports a sliding boom (shuttle boom) with the suspended structure. It is to provide a crane that suppresses swinging and improves stability.

To achieve the above object, a quay crane according to the present invention is a quay crane that supports a sliding boom with a support structure having a leg structure, and the support structure is a leg structure at an upper end of the leg structure. A horizontal member, a suspension structure suspended from the leg structure horizontal member via a support pin, and a support wheel installed on the suspension structure, the support wheel configured to support the sliding boom. In the supporting quay crane, one end is fixed to the suspension structure and the other end is the
An extension arm portion extending along the traveling direction of the quay crane, and a buffer member installed on the leg structure horizontal member or a leg constituting the leg structure and separated from the extension arm portion. The buffer member is normally configured not to come into contact with the extension arm portion, and when the suspension structure swings around the support pin, around the other end of the extension arm portion. It is provided with the structure which restrains rocking | fluctuation of the said extension arm part by colliding with a part.

  With this configuration, the swinging (rotating motion) of the suspended structure can be easily suppressed, and the stability of the crane can be improved. This is because the moment of the suspension structure around the support pin is constrained by the buffer member with the extended arm portion as a point of action at a position away from the support pin. That is, since the restraining force is proportional to the length of the extension arm portion, it can be easily increased. Further, the buffer member can be reduced in size.

The buffer member can be configured to be destroyed when an external force exceeding a predetermined value is applied.

Suspended rack structure is formed of a member of two substantially I-shaped that will be placed in a state of sandwiching the sliding boom from both sides in the running direction, each of the substantially I-shaped member is a supporting pin on the leg structure horizontal member It is possible to adopt a configuration in which the extension arm portion is installed while being suspended through the cable.

  According to the quay crane according to the present invention, in a quay crane (low profile crane) that supports a sliding boom (shuttle boom) with a suspension structure, the suspension structure is restrained from swinging in the traveling direction x and is stable. It is possible to provide a quay crane with an improved height.

It is the figure which showed the quay crane of embodiment which concerns on this invention. It is the figure which showed the wharf crane of different embodiment which concerns on this invention. It is the figure which showed the wharf crane of different embodiment which concerns on this invention. It is the figure which showed the wharf crane of different embodiment which concerns on this invention. It is the figure which showed the outline of the conventional low profile crane. It is the figure which showed the outline of the conventional low profile crane.

  Hereinafter, a quay crane (hereinafter, a low profile crane or a crane) according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the front enlarged view of the principal part of the low profile crane 1 of embodiment which concerns on this invention is shown. The crane 1 is a quay crane supported by a support structure having a sliding boom (shuttle boom) 2 having a leg structure. The support structure includes a leg structure horizontal member 6 at the upper end of the leg structure, a suspension structure 3 suspended from the leg structure horizontal member 6 via a support pin 4, and a support installed in the suspension structure 3. Wheels 5. The support wheel 5 supports the shuttle boom 2.

  The suspension structure 3 has an extension arm portion 20 formed by extending in a direction away from the support pin 4. The crane 1 also has a suspension structure 3 centered on the support pin 4 and a buffer member 21 that restrains the swing (see arrow) of the extension arm portion 20 fixed to the suspension structure 3.

  This suspension structure 3 is formed in a substantially U-shape with the lower end as an open end. Moreover, the extension arm part 20 is each extended | stretched and fixed to the front-back direction (FIG. 1 left-right direction) of the traveling direction x of the crane 1 from the suspension structure 3. As shown in FIG. Further, the buffer member 21 is fixed to the leg structure horizontal member 6 so as to be positioned above the peripheral portion of the end portion away from the support pin 4 in the extension arm portion 20. The buffer member 21 is arranged so as to obstruct the path through which the extension arm portion 20 passes when the extension arm portion 20 rotates vertically upward together with the swinging of the suspension structure 3. Here, the buffer member 21 can be formed of, for example, a metal material, a rubber material, or a synthetic resin material.

  Next, the operation of the crane 1 will be described. When the crane 1 travels in the travel direction x, the suspension structure 3 may swing (rotate) about the support pin 4 (see the arrow in FIG. 1). At this time, the extension arm portion 20 fixed to the suspension structure 3 also tries to swing together with the suspension structure 3 but collides with the buffer member 21 fixed to the leg structure horizontal member 6. Therefore, the rotation of the suspension structure 3 around the support pin 4 is restrained.

  With the above configuration, the swinging (rotating motion) of the suspension structure 3 can be easily suppressed, and the stability of the crane 1 can be improved. This is because the moment of the suspension structure 3 around the support pin 4 is constrained by the buffer member 21 with the extended arm portion 20 at a position away from the support pin 4 as an action point. That is, since the restraining force is proportional to the length of the extension arm portion 20, it can be easily increased. Further, the buffer member 21 can be reduced in size.

  Note that the suspension structure 3 only needs to have at least one extension arm portion 20, and may have a plurality of extension arm portions 20. However, when the extension arm portions 20 are installed on both sides of the suspension structure 3 in the front-rear direction (the left-right direction in FIG. 1) in the traveling direction x, the external force generated in the buffer member 21 is greater when the extension arm portions 20 are installed. As a result, the buffer member 21 can be reduced in size.

  Moreover, the material which comprises the buffer member 21 is not restricted to the above-mentioned thing. The buffer member 21 may be any shape and material that can restrain the rotation of the extension arm 20.

  Furthermore, the position where the extension arm part 20 is installed is not limited to the position above the suspension structure 3 as shown in FIG. The extension arm part 20 may be installed so that the point of action for restraining the swinging of the suspension structure 3 is located away from the support pin 4. For example, the extension arm part 20 may be installed so as to extend from the vicinity of the support wheel 5 toward the leg 11 (see the broken line in FIG. 1). At this time, the buffer member 21 is fixed to the leg 11.

  In addition, the buffer member 21 may have a size or an arrangement position that does not contact the extension arm portion 20 in a normal state. With this configuration, the minute vibration of the suspension structure 3 does not cause the buffer member 21 to generate an external force, so that the durability of the buffer member 21 can be improved. Furthermore, the effect that the leg structure horizontal member 6 and the leg 11 are deformed by their own weight, the load of the suspended load, or the like is prevented from being transmitted to the suspension structure 3 through the buffer member 21 and the extension arm portion 20. Can do. Thereby, the minute rocking | fluctuation of the suspension structure 3 can be suppressed and the shuttle boom 2 can be moved more smoothly.

  FIG. 2 shows a low profile crane 1A according to another embodiment of the present invention. The crane 1A includes a suspension structure 3A that is formed in two substantially I-shapes and that sandwiches the shuttle boom 2 from both sides, an extension arm portion 20A that is fixed to the suspension structure 3A, and a leg structure. It has a buffer member 21 </ b> A fixed to the horizontal member 6.

  The suspension structure 3A is formed of two substantially I-shaped members, each of which is suspended from the leg structure horizontal member 6 via a pin support 4A. Further, the buffer member 21A is fixed to the leg structure horizontal member 6 so as to sandwich the peripheral portion of the end portion away from the support pin 4A from the vertical direction in the extension arm portion 20A.

  With the above configuration, when the suspension structure 3A tries to rotate around the support pin 4A, the buffer member 21A restrains the extension arm portion 20A, so that the suspension structure 3A can be easily swung (rotated). It can suppress and can improve stability of crane 1A.

  Note that the interval between the two buffer members 21A arranged so as to sandwich the extension arm portion 20A from above and below may be arranged to be wider than the length of the extension arm portion 20A in the vertical direction z. With this configuration, the minute vibration of the suspension structure 3A does not generate an external force on the buffer member 21A, so that the durability of the buffer member 21A can be improved. Furthermore, it is possible to prevent the effects of deformation of the leg structure horizontal member 6 and the legs 11 due to their own weight or the load of the suspended load from being transmitted to the suspension structure 3 through the buffer member 21 and the extension arm portion 20. it can.

  Further, the extension arm portion 20A is not limited to the configuration having the longitudinal direction in the horizontal direction (left-right direction in FIG. 2) as shown in FIG. For example, the extension arm 20A may be configured to extend vertically upward from the vicinity of the support wheel 5 toward the leg 11 (see the broken line in FIG. 2). With this configuration, it is possible to improve the durability of the joint portion between the suspension structure 3A and the extension arm portion 20A. This is because the force generated at the joint portion between the suspension structure 3A and the extension arm portion 20A is in the compression direction, and an accident that the joint portion is broken can be prevented.

  FIG. 3 shows a low profile crane 1B according to another embodiment of the present invention. This crane 1B has two suspension structures 3B formed in a substantially I-shape, similarly to the embodiment shown in FIG. In addition, the crane 1B includes an extension arm portion 20B formed by extending from the two substantially I-shaped suspension structures 3B toward each other, and the vicinity of the end portions of the two extension arm portions 20B on the side close to each other. It has the buffer member 21B arrange | positioned so that a part may be pinched | interposed from an up-down direction. The buffer member 21B is fixed to the leg structure horizontal member 6.

  With the above configuration, the same operational effects as described above can be obtained. Moreover, the maintainability of the buffer member 21B in the crane 1B can be improved. This is because the buffer member 21B is positioned near the center of the crane 1B, and the operator can perform maintenance work such as inspection and replacement of the buffer member 21B from the upper surface of the leg structure horizontal member 6 and the shuttle boom 2. Because.

  In addition, you may fix the buffer member 21B so that not the leg structure horizontal member 6 but two extension arm parts 20B may mutually be connected. With this configuration, the same effects as described above can be obtained. Further, the buffer member 21B may be configured to be destroyed when receiving an external force exceeding a predetermined value. With this configuration, when an earthquake or the like occurs, the suspended structure 3B swings together with the shuttle boom 2 due to the destruction of the buffer member 21B, so that it can be used as a damping mass. That is, since the shuttle boom 2 and the suspension structure 3B swing in the traveling direction x as a damping mass, vibration of the entire crane 1B in the traveling direction x can be suppressed. In addition, the structure which utilizes a suspension structure and a shuttle boom as a damping mass can be similarly employed for the cranes 1 and 1A shown in FIGS.

  Furthermore, similarly to the embodiment described in FIGS. 1 and 2, the buffer member 21B may have a size or an arrangement position that does not contact the extension arm portion 20B during normal operation.

  FIG. 4 shows a low profile crane 1C according to another embodiment of the present invention. This crane 1C has two substantially I-shaped suspension structures 3C and extension arm portions 20C, as in the embodiment shown in FIG. The crane 1C has a buffer member 21C provided with a damper mechanism. One of the buffer members 21C provided with this damper mechanism is fixed to the leg structure horizontal member 6 or the leg 11 of the crane 1C, and the other is fixed to the extension arm portion 20C.

  With the above configuration, the swing of the suspension structure 3C can be attenuated, and the swing generated in the entire crane 1C can be suppressed. This is because the force transmitted from the suspension structure 3C to the leg structures 6 and 11 via the buffer member 21C can be attenuated by the buffer member 21C having a damper mechanism. That is, stability can be improved more than the above-mentioned crane.

  Note that the buffer member 21 </ b> C provided with the damper mechanism may have an adjustment mechanism for adjusting the damping force. Moreover, you may comprise so that expansion / contraction of the buffer member 21C provided with the damper mechanism can be controlled actively. With this configuration, the swinging of the suspension structure and the shuttle boom can be positively attenuated, so that the stability of the crane can be further improved. The configuration related to the buffer member 21C provided with the above-described damper mechanism can also be applied to the embodiments described in FIGS.

1, 1A, 1B, 1C Quay crane, low profile crane 2 Sliding boom, shuttle boom 3, 3A, 3B, 3C Suspension structure 4, 4A, 4B Support pin 5 Support wheel 6 Leg structure horizontal member 20, 20A, 20B, 20C Extension arm portion 21, 21A, 21B Buffer member 21C Buffer member provided with damper mechanism

Claims (3)

A quay crane that supports a sliding boom with a support structure of a leg structure,
The support structure includes a leg structure horizontal member at an upper end of the leg structure, a suspension structure suspended from the leg structure horizontal member via a support pin, and a support wheel installed in the suspension structure. And a quay crane in which the support wheel supports the sliding boom,
One end is fixed to the suspension structure, and the other end is installed on the leg constituting the leg structure horizontal member or the leg structure, and the extension is extended along the traveling direction of the quay crane. A buffer member separated from the arm portion,
The buffer member is normally configured not to contact the extension arm portion, and when the suspension structure swings around the support pin, a peripheral portion of the other end of the extension arm portion A quay crane having a configuration that collides and restrains the swinging of the extension arm portion. The quay crane according to claim 1, wherein the buffer member is configured to be destroyed when an external force exceeding a predetermined value is applied . The suspension structure is configured to pre-Symbol sliding boom in two substantially I-shaped member that will be disposed in a state sandwiching from both sides of the traveling direction, each of the substantially I-shaped member and the leg structure The quay crane according to claim 1 or 2, wherein the extension arm portion is installed while being suspended from a horizontal member via the support pin .

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