JP2011251835A - Quay crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crane that includes a support structure preventing noise of a slide boom 2 during movement, which is simple and has high durability, and which includes a movable cargo machinery (trolley 12), in a low-profile crane (quay crane) 1.SOLUTION: In the quay crane 1 in which a support structure included in a leg structure slidably supports a slide boom 2, the support structure includes: a leg structure horizontal member 6 at an upper end of the leg structure; a suspended structure 3 suspended from the leg structure horizontal member 6; and a support wheel 5 installed to the suspended structure 3. The support wheel 5 supports the slide boom 2.

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, 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 in such a container terminal (see, for example, Patent Document 1). FIG. 4 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. .

  Next, cargo handling work by the low profile crane 1X will be described. The crane 1 </ b> X lifts the container 15 mounted on the container ship 18 with the trolley 12 and performs a cargo handling operation for mounting on the trailer 17 waiting on the quay 16. Alternatively, the crane 1 </ b> X performs a cargo handling operation for loading the container 15 from the trailer 17 onto the container ship 18. In this loading / unloading work, the crane 1X moves along the quay 16 (in the back or front direction of FIG. 4) with the traveling device 13 and performs the loading / unloading work while changing the unloading or loading position. When the cargo handling work is completed and the container ship 18 leaves the berth, the shuttle boom 2 of the crane 1X moves to the land side (left side in FIG. 4) and enters a rest state (FIG. 5).

  FIG. 5 shows a resting state of the low profile crane 1X. When the container ship berths, the crane 1X projects the shuttle boom 2 to the sea side (right side in FIG. 5) and enters a working state. This is performed in order to avoid interference between the bridge of the container ship 18 and the shuttle boom 2 when the container ship 18 contacts or leaves the berth. In addition, 14 has shown the machine room, y has shown the transverse direction or the sea-land direction of a crane, and z has shown the perpendicular direction.

  By the way, in recent years, with the increase in size of container ships, the size of low-profile cranes has also increased. Therefore, the shuttle boom installed in the crane is also large, and the weight has reached 500 to 600 t. The low profile crane has a support structure for supporting the shuttle boom and moving in the sea-land direction. As the support structure of the shuttle boom, (1) a cantilever structure, (2) a structure in which a vertical reinforcing material is added to the cantilever structure, and (3) a frame type structure have been put into practical use. Hereinafter, it demonstrates in order.

  FIG. 6 shows a low profile crane 1P employing a cantilever structure. Here, FIG. 6A shows a front view of the low profile crane 1P having the cantilever structure 20 viewed from the sea side, and FIG. 6B shows an enlarged view of the periphery of the cantilever structure 20. In addition, this cantilever structure 20 is formed in at least one of the sea side leg 11a or the land side leg 11b.

The crane 1P has a cantilever structure 20 installed on the leg 11 (the sea side leg 11a or the land side leg 11b) and a support wheel 5 installed on the end of the cantilever structure 20. The shuttle boom 2 is configured to move on the support wheel 5 in the sea-land (front or back in FIG. 6) direction y. The trolley 12 is configured to move in the sea-land direction y on the shuttle boom 2. Furthermore, the leg structure horizontal member 6 has a support wheel 5a for pressing the lift of the shuttle boom 2 downward. Note that x indicates the traveling direction of the crane. Reference numeral 13 denotes a traveling device, and 15 denotes a container.

  FIG. 7A shows a state of the leg structure in which the shuttle boom 2 and the trolley 12 are removed from the crane 1P. FIG. 7B shows a deformation analysis model of the leg structure. The broken line in FIG. 7B shows the state of the leg structure when no load is applied to the support wheel 5, and the solid line shows the deformation of the leg structure when the load such as the shuttle boom 2 and the trolley 12 is applied to the support wheel 5. The shape is shown.

  This cantilever structure has several problems. First, when a load is applied to the support wheel 5, there is a problem that the entire leg structure is deflected as shown by the solid line in FIG. 7B. Due to the deformation of the leg structure, the distance between the support wheels 5 increases from D1 to D2, and the support wheels 5 tilt. For this reason, the shuttle boom 2 and the support wheel 5 will contact non-uniformly (one-piece contact).

  Secondly, there is a problem that it is difficult to suppress the deflection generated in the leg structure. That is, to suppress the deflection, it is necessary to increase the size of the leg structure or add a reinforcing material, which means an increase in the size and weight of the crane. In most cases, the crane cannot increase its weight due to problems such as the strength of the quay.

  Third, since the load applied to the support wheel 5 varies between 0 and 100%, the design (analysis) is difficult. Since the load applied to the support wheel 5 becomes 0% and the shuttle boom 2 may float completely from the support wheel 5, the support wheel 5a (see FIG. 6B) is also installed on the upper surface side of the shuttle boom 2. Sometimes.

  Further, in the crane 1 </ b> P having a cantilever structure, the load applied to the support wheel 5 changes as the shuttle boom 2 moves. Due to this load change, the leg structures 6 and 11 and the cantilever structure 20 are deflected. Due to this deflection, the position of the support wheel 5 changes, and one-sided contact occurs with respect to the shuttle boom 2. This one-piece contact causes noise generation, and further causes wear of the support wheel 5 and the shuttle boom 2. As described above, there is a possibility that the shuttle boom 2 may be damaged and an accident that the shuttle boom 2 is detached from the support wheel 5 may occur.

  FIG. 8A shows a low profile crane 1Q in which a vertical reinforcing member 21 is installed on a cantilever structure 20, and FIG. 8B shows an enlarged view of the periphery of the vertical reinforcing member 21. The crane 1 </ b> Q connects the cantilever structure 20 and the leg structure horizontal member 6 with a vertical reinforcing member 21. As shown in FIG. 8B, the vertical reinforcing member 21 is configured by connecting an x-direction swinging member 31 installed on each of the leg structure horizontal member 6 and the cantilever structure 20 with a y-direction swinging member 32. . As shown by the arrow in FIG. 8B, the vertical member 21 is swingable in the traveling direction x and the transverse direction y of the crane. With this configuration, the vertical reinforcing member 21 can suppress the deflection of the cantilever structure 20.

  However, the structure in which the vertical reinforcing member 21 is added to the cantilever structure 20 has several problems. First, the installation of the vertical reinforcement 21 has a problem that the weight of the crane increases.

Second, since the structure of the vertical reinforcing material 21 is complicated, the manufacturing cost of the vertical reinforcing material 21 increases. At the same time, since the structure of the vertical reinforcing member 21 is complicated, the durability is lowered. The structure of the vertical reinforcing member 21 is complicated because it supports only a vertical load and prevents a force from acting in a horizontal direction or a twisting direction.

  FIG. 9A shows a low profile crane 1R provided with a frame-type structure 22, and FIG. 9B shows an enlarged view of the periphery of the frame-type structure 22. The crane 1 </ b> R has a frame structure 22 installed on the legs 11. Due to this shape, this frame-type structure 22 suppresses the occurrence of deflection even when a load is applied to the support wheel 5, and suppresses the shuttle boom 2 and the support wheel 5 from contacting non-uniformly to some extent. can do.

  However, the location where the frame structure 22 is installed has a problem that the trolley 12 cannot pass between the support wheels 5. That is, the frame structure 22 cannot be installed on the seaside leg 11a. In addition, the installation of the frame structure 22 has a problem that the weight of the crane increases.

Japanese Utility Model Publication No. 01-121091

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a quay crane (low profile crane) in which a sliding boom (shuttle boom) is supported by a support structure having a leg structure so as to be slidable in a horizontal direction. ), A quay crane having a structure in which the supporting structure prevents noise during movement of the sliding boom, is simple and highly durable, and the cargo handling device (trolley) is movable.

  In order to achieve the above object, a quay crane according to the present invention is a quay crane that slidably supports a sliding boom with a support structure included in a leg structure, wherein the support structure is a leg structure at an upper end of the leg structure. An object horizontal member, a suspension structure suspended from the leg structure horizontal member, and a support wheel installed on the suspension structure, wherein the sliding boom is supported by the support wheel. To do.

  With this configuration, it is possible to prevent the generation of noise when the sliding boom (shuttle boom) moves. That is, since the suspension structure is a structure formed separately from the leg structure, the rigidity of the suspension structure can be designed high. Furthermore, since loads such as a sliding boom and a cargo handling device (trolley) are applied to the leg structure horizontal member via the suspension structure, the suspension structure is deformed even if the leg structure is deformed, and Changes in the position and direction of the support wheels can also be prevented or suppressed. Therefore, it is possible to prevent the generation of noise that leads to wear of the support wheels and the like and accidents of wheel removal.

  In the above quay crane, the suspension structure is substantially U-shaped with the lower end as an open end, and has a support wheel at the open end of the suspension structure.

  With this configuration, it is possible to prevent the generation of noise when the sliding boom is moved. Even if the load applied to the suspension structure fluctuates with the movement of the sliding boom or the cargo handling device (trolley) traveling on the sliding boom, This is because the distance and direction of the support wheels do not change. Moreover, since the suspended structure is substantially U-shaped, the structure can be configured to be simple and highly durable. Furthermore, the trolley can pass by the structure which makes an open end downward. That is, the above support structure can be adopted for the sea side leg.

  In the above quay crane, the suspension structure is installed above the suspension structure on the leg structure horizontal member via a pin so that the suspension structure can swing along the longitudinal direction of the leg structure horizontal member. It is characterized by comprising.

  With this configuration, it is possible to easily analyze and design the deformation of the leg structure. This is because the load of the sliding boom is applied vertically downward only to the place where the pin is installed by the leg structure horizontal member. Further, when the sliding boom vibrates in the traveling direction of the crane as the quay crane travels (when an eccentric load is generated), the suspension structure swings and this vibration can be suppressed. That is, it is possible to suppress or prevent the force that complicates the analysis such as torsion from acting on the leg structure.

  In the above quay crane, the suspension structures are respectively installed on the leg structure horizontal members of both the sea side legs and the land side legs constituting the leg structures. With this configuration, the same operational effects as described above can be obtained sufficiently.

  In the above quay crane, the suspension structure is installed on a horizontal member of either the sea side leg or the land side leg constituting the leg structure, and the support is provided on the other leg structure. It is characterized by installing wheels. With this configuration, the same effects as described above can be obtained. Moreover, the support structure of this invention can be easily employ | adopted by modifying the conventional quay crane.

  According to the quay crane according to the present invention, in the quay crane (low profile crane) in which the sliding boom (shuttle boom) is supported by the supporting structure having the leg structure so as to be slidable in the horizontal direction, the supporting structure is a sliding boom. It is possible to provide a quay crane that prevents noise during movement, is simple and highly durable, and allows a cargo handling device (trolley) to be moved.

It is the figure which showed the quay crane of embodiment which concerns on this invention. 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 conventional low profile crane (working state). It is the figure which showed the conventional low profile crane (resting state). It is the figure which showed the cantilever structure of the conventional low profile crane. It is the figure which showed the deformation | transformation analysis model of the cantilever structure. It is the figure which showed the structure which attached | subjected the vertical reinforcement material to the conventional cantilever structure. It is the figure which showed the frame type structure 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 low profile crane 1 of embodiment which concerns on this invention is shown. The crane 1 has legs 11 (sea side legs 11a or land side legs 11b) and leg structure horizontal members 6. The crane 1 also has a suspension structure 3 suspended from a leg structure horizontal member 6 via a pin 4.

  This suspension structure 3 is preferably formed in a substantially U-shape with the open side at the bottom. Each suspension structure 3 has support wheels 5 at the lower open ends. The suspension structure 3 is configured to be swingable in the traveling direction x around the pin 4.

  A sliding boom (hereinafter referred to as shuttle boom) 2 is movably supported by support wheels 5 installed on the suspension structure 3. Furthermore, the crane 1 has a cargo handling device (hereinafter referred to as a trolley) 12 that moves along a rail (not shown) formed on the shuttle boom 2.

  In the low profile crane 1, the above suspension structure 3 is installed on at least one of the sea side leg 11a or the land side leg 11b, and the other uses the conventional support structure to support the shuttle boom 2. Can be configured. Desirably, the suspension structure 3 is installed on both the sea-side leg 11a and the land-side leg 11b to support the shuttle boom 2.

  The structure for suspending the suspension structure 3 from the leg structure horizontal member 6 is not limited to the pin 4 described above, and has a structure for suspending the weight of the suspension structure 3 and the shuttle boom 2 in the vertical direction. It only has to be. For example, the suspension structure 3 may be suspended by a wire or a link structure.

  FIG. 2 shows an enlarged side view of the low profile crane 1. The suspension structure 3 is installed so as to sandwich the leg structure horizontal member 6 from the transverse direction y. A support wheel 5 is installed at the lower end of the suspension structure 3. This support wheel 5 supports the shuttle boom 2. The shuttle boom 2 is configured to be movable in the transverse direction y on the support wheel 5 (see arrow in FIG. 2).

  Next, operation | movement of the support structure of the crane 1 is demonstrated with reference to FIG. When the crane 1 performs a cargo handling operation (working state), the trolley 12 travels along the shuttle boom 2. At this time, the shuttle boom 2 is fixed so as not to move in the transverse direction y of the crane 1. On the other hand, when the crane 1 finishes the cargo handling operation and the container ship 18 leaves the bank (rest state), the shuttle boom 2 moves to the land side (left side in FIG. 2) on the support wheel 5 installed in the suspension structure 3. To do. The shuttle boom 2 can be moved by pulling a wire or the like installed on the shuttle boom 2 or by rotating the support wheel 5.

  With the above configuration, the following operational effects can be obtained. First, it is possible to prevent the support wheels 5 from hitting one side when the shuttle boom 2 moves. Therefore, generation of noise can be prevented and the life of the support wheel 5 can be extended. This is because the load fluctuations of the shuttle boom 2 and the trolley 12 applied to the support wheels 5 do not affect the distance between the support wheels 5 on both sides.

  Second, since the shape of the suspension structure 3 is simple, a support structure that can be manufactured at low cost and has high durability can be obtained. Furthermore, the load of the shuttle boom 2 is applied vertically downward only to the place where the pin 4 is installed by the leg structure horizontal member 6. Therefore, analysis and design relating to deformation and the like of the leg structure can be easily performed.

  When the shuttle boom 2 vibrates in the traveling direction x as the crane 1 travels, the suspension structure 3 swings in the traveling direction x (see the arrow in FIG. 1) and can be suppressed. With this configuration, it is possible to suppress or prevent a force that complicates analysis such as torsion from occurring in the leg structure.

Thirdly, since the suspension structure 3 has a substantially U-shape with the open end at the bottom, the trolley 12 can pass through. For this reason. The support structure using the suspension structure 3 can be employed for either of the sea side legs 11a and 11b.
FIG. 3 shows a low profile crane 1A according to another embodiment of the present invention. The crane 1A employs a support structure that uses the suspension structure 3 for the sea-side leg 11a, and a support structure that uses the frame-type structure 22 for the land-side leg 11b. In addition, the crane 1A is a seaside leg 1
1a, land-side leg 11b, shuttle boom 2, machine room 14, and trolley 12.
Here, the land-side leg 11b has a shape inclined to the land side (left side in FIG. 3). This is a shape necessary when the hatch cover 19 installed on the container ship 18 is removed by the crane 1A. Normally, the hatch cover 19 is placed on the land side (left side in FIG. 3) with respect to the land-side traveling device 13b, and thus the trolley 12 can be moved to the land side with respect to the land-side traveling device 13b. In addition, since the inclination of the land side leg 11b becomes unnecessary if the support structure using the suspension structure 3 is employ | adopted for the land side leg 11b, size reduction and weight reduction of the crane 1A are realizable.

DESCRIPTION OF SYMBOLS 1, 1A Quay crane, low profile crane 2 Sliding boom, shuttle boom 3 Suspended structure 4 Pin 5 Support wheel 6 Leg structure horizontal member 11 Leg 11a Sea side leg 11b Land side leg

Claims (5)

In a quay crane that slidably supports a sliding boom with a support structure of a leg structure,
The support structure has a leg structure horizontal member at the upper end of the leg structure, a suspension structure suspended from the leg structure horizontal member, and a support wheel installed on the suspension structure,
A quay crane, wherein the sliding boom is supported by the support wheel.   2. The quay crane according to claim 1, wherein the suspension structure is substantially U-shaped with an open end at a lower side, and has a support wheel at an open end of the suspension structure.   The upper part of the suspension structure is installed on the leg structure horizontal member via a pin, and the suspension structure is configured to be swingable along the longitudinal direction of the leg structure horizontal member. The quay crane according to claim 1 or 2.   4. The suspension structure according to claim 1, wherein the suspension structure is installed on each of the leg structure horizontal members of both the sea-side leg and the land-side leg constituting the leg structure. 5. Quay crane.   The suspension structure is installed on one leg structure horizontal member of either the sea side leg or the land side leg constituting the leg structure, and the support wheel is installed on the other leg structure. The quay crane according to any one of claims 1 to 3, wherein

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