JP6896460B2 - Cargo handling equipment - Google Patents

Description

The present invention relates to a cargo handling device.

Conventionally, as a technique in such a field, for example, a cargo handling device described in Patent Document 1 is known. The main body of the cargo handling device of Patent Document 1 is divided into a plurality of parts in the vertical direction. Further, a seismic isolation device is provided between the upper end side portion and the lower end side portion of the main body portion. Immediately after the occurrence of an earthquake in the cargo handling device, the shear pin that regulates the relative movement between the upper end side portion and the lower end side portion breaks. As a result, the seismic isolation function of the seismic isolation device works.

Japanese Unexamined Patent Publication No. 2011-144404

Here, when a large earthquake occurs, long-period vibration may occur after short-period vibration occurs. Since the cargo handling device of Patent Document 1 assumes short-period vibration, it can cope with short-period vibration immediately after the occurrence of an earthquake. However, there is a possibility that the vibration of the cargo handling device becomes large because the long-period vibration and the natural period of the cargo handling device in the state where the seismic isolation device is operating substantially match.

Therefore, an object of the present invention is to provide a cargo handling device capable of suppressing vibration according to a frequency that changes with the passage of time.

In order to solve the above problems, the cargo handling device according to the present invention includes a main body portion divided into a first portion on the upper end side and a second portion on the lower end side, and a first portion and a second portion. The seismic isolation portion is provided between the seismic isolation portions and enables the relative movement of the first portion in a predetermined direction with respect to the second portion, and the seismic isolation portion corresponds to the vibration of the first period. The seismic isolation unit is configured to be switchable between the first mode and the second mode corresponding to the vibration of the second cycle, which is a cycle longer than the first cycle, and the seismic isolation unit is the first mode and the second mode. Switch in the order of.

According to the cargo handling device according to the present invention, the seismic isolation unit corresponds to the vibration of the first cycle corresponding to the vibration of the first cycle and the vibration of the second cycle which is a cycle longer than the first cycle. It is configured so that it can be switched between two modes. Further, the seismic isolation unit switches in the order of the first mode and the second mode. Therefore, for the vibration of the first cycle of the short cycle immediately after the occurrence of the earthquake, the seismic isolation unit is set to the first mode corresponding to the vibration of the first cycle. On the other hand, for the vibration of the second cycle of the long cycle that occurs after the short cycle, the seismic isolation unit is set to the second mode corresponding to the vibration of the second cycle. As described above, the vibration can be suppressed according to the frequency that changes with the passage of time.

In the cargo handling device, the seismic isolation portion is inserted into the first member and the second member that move relative to each other with vibration, and the first member and the second member in a superposed state, and the second member. The first mode is provided with a first shear pin that breaks when the mode is set to 1, and a second shear pin that can be inserted into the first member and the second member in a superposed state. After that, the mode may be switched from the first mode to the second mode by inserting the second shear pin into the first member and the second member in the overlapped state. As a result, in the first mode, the restraint between the first member and the second member is released by breaking the first shear pin. Therefore, the seismic isolation unit can act on the seismic isolation function against vibration. On the other hand, in the second mode, the second shear pin is inserted into the first member and the second member in the overlapped state. As a result, the relative movement between the first member and the second member is restricted, so that the seismic isolation function of the seismic isolation portion is stopped. Therefore, even when the relationship between the vibration of the second period of the long period and the natural period of the cargo handling device in the state where the seismic isolation function of the seismic isolation unit is operating is established, the seismic isolation unit is established. By stopping the seismic isolation function of, it is possible to prevent the vibration of the cargo handling device from becoming large.

In the cargo handling device, the seismic isolation unit may switch to the second mode after a preset set time has elapsed after the first shear pin is broken. As a result, the seismic isolation unit can easily switch from the first mode to the second mode without providing a special sensor for measuring seismic waves.

According to the present invention, it is possible to provide a cargo handling device capable of suppressing vibration according to a frequency that changes with the passage of time.

It is a perspective view which shows the cargo handling apparatus which concerns on embodiment of this invention. The configuration when the seismic isolation part is viewed from the negative side in the Y-axis direction is shown. FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. It is a schematic diagram which shows the state of the switching mechanism at the time of normal operation in which an earthquake does not occur. It is a schematic diagram which shows the state of the switching mechanism in the 1st mode. It is a schematic diagram which shows the state of the switching mechanism in the 2nd mode. It is a schematic diagram which shows the structure of the switching mechanism of the cargo handling apparatus which concerns on a modification. It is a figure when the switching mechanism of the cargo handling apparatus which concerns on a modification is seen from the positive side in the X-axis direction.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals will be used for the same or equivalent elements, and duplicate description will be omitted.

The cargo handling device 1 according to the present embodiment is provided on a quay, for example, and is used for cargo handling operations such as loading cargo (for example, loose objects and containers) on a berthed ship or landing cargo from a ship. As shown in FIG. 1, the cargo handling device 1 includes a cargo handling section 2 that performs cargo handling work, a girder section 3 that supports the cargo handling section 2, and a main body section 10 that supports the cargo handling section 2 via the girder section 3. And, it is equipped with seismic isolation units 30 and 40 for seismic isolation. The main body portion 10 is divided into an upper main body portion 11, a lower main body portion 12, and a traveling portion 20. The traveling portion 20 is provided at the lower part of the lower main body portion 12 and is for causing the main body portion 10 to travel along the rail R. The seismic isolation unit 30 may be omitted.

The cargo handling unit 2 is for carrying out cargo handling work, and in the case of a crane, a club trolley type, a rope trolley type, a hoist type, etc. can be adopted, and in the case of an unloader, a club trolley type or a double type. A link type or the like can be adopted.

The girder section 3 supports the cargo handling section 2. The girder portion 3 is attached to the main body portion 10 so as to extend in the horizontal direction intersecting the rail R. The girder portion 3 has a girder 3A attached to the main body portion 10 and a boom 3B having one end connected to the girder 3A and the other end undulating with respect to the girder 3A. The girder portion 3 does not have to be undulating. Further, a part of the girder portion 3 does not have to protrude toward the ship side.

A machine room 4 is provided above the upper main body portion 11. The machine room 4 is provided with a drive mechanism for raising and lowering the boom 3B. The machine room 4 is supported by the main body 10. In the following, the direction in which the girder portion 3 extends is the Y-axis direction, the direction in which the rail R extends and the main body portion 10 travels (horizontal direction perpendicular to the Y-axis direction) is the X-axis direction, and the vertical direction. It will be described as the Z-axis direction.

The upper main body 11 is provided with four legs 11A, and the lower main body 12 is also provided with four legs 12A. The position of each leg portion 11A of the upper main body portion 11 in the plan view coincides with the position of each leg portion 12A of the lower main body portion 12 in the plan view. A beam 11B connecting the lower portions of the two leg portions 11A is fixed to the lower portion of the leg portion 11A of the upper main body portion 11, and the beam 11B extends in the Y-axis direction. A beam 12C connecting the upper portions of the two leg portions 12A is fixed to the upper portion of the leg portion 12A of the lower main body portion 12, and the beam 12C extends in the Y-axis direction. Further, the lower main body portion 12 has a beam 12B connected to the lower ends of the two leg portions 12A and extending in the X-axis direction. When the seismic isolation portion 30 is omitted, the leg portion 11A and the leg portion 12A may be integrated.

The traveling portion 20 is provided at the lower part of the main body portion 10, and causes the main body portion 10 to travel along the rail R. The traveling portion 20 is fixed below each beam 12B of the lower main body portion 12, and includes wheels 21 for traveling the main body portion 10 along the rail R.

The seismic isolation portion 40 is provided between the beam 12B of the lower main body portion 12 and the traveling portion 20. In addition, with respect to the seismic isolation portion 40, the lower main body portion 12 (when the seismic isolation portion 30 is omitted, the upper main body portion 11 and the lower main body portion 12 which are integrated) is the "first on the upper end side" in the claim. It corresponds to the "part 1", and the traveling portion 20 corresponds to the "second part on the lower end side". The seismic isolation portion 30 is provided between each leg portion 11A of the upper main body portion 11 and each leg portion 12A of the lower main body portion 12. With respect to the seismic isolation portion 30, the upper main body portion 11 corresponds to the "first portion on the upper end side" in the claim, and the lower main body portion 12 corresponds to the "second portion on the lower end side".

Next, the structure of the seismic isolation unit 40 will be described with reference to FIGS. 2 and 3. The seismic isolation unit 30 may also have the same configuration as the seismic isolation unit 40 below. FIG. 2 shows the configuration when the seismic isolation portion is viewed from the negative side in the Y-axis direction. Note that FIG. 2 shows the seismic isolation portion 40 indicated by “40A” in FIG. FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. As shown in FIG. 2, the seismic isolation unit 40 includes a seismic isolation rubber 50, slide mechanisms 70A and 70B, a damper mechanism 80, and a link mechanism 60. The slide mechanism 70A and the slide mechanism 70B are arranged so as to sandwich the seismic isolation rubber 50 in the X-axis direction. Further, the damper mechanism 80 is arranged so as to sandwich the slide mechanism 70B with the seismic isolation rubber 50 in the X-axis direction. However, the arrangement of each component is not particularly limited.

The seismic isolation portion 40 includes a bracket 51 fixed to the lower surface of the beam 12B of the lower main body portion 12, a bracket 52 fixed to the upper surface of the base portion 41 provided on the upper surface of the traveling portion 20, and the bracket 51 and the bracket 52. It is provided with a laminated rubber 53 provided between the and. The upper end of the laminated rubber 53 is fixed to the bracket 51, and the lower end of the laminated rubber 53 is fixed to the bracket 52. The laminated rubber 53 is formed by laminating a plurality of rubber plates in the vertical direction.

In the slide mechanisms 70A and 70B, the guided member 71 fixed to the lower surface of the beam 12B of the lower main body portion 12, the flange portion 72 extending horizontally at the lower end portion of the guided member 71, and the flange portion 72 are lifted. It is provided with a levitation prevention roller 73 to prevent the above. The guided member 71 extends downward from the lower surface of the beam 12B and extends in the Y-axis direction. Further, the flange portion 72 extends from the lower end of the guided member 71 to both sides in the X-axis direction and extends in the Y-axis direction. The levitation prevention rollers 73 are provided in pairs so as to sandwich the guided member 71. The levitation prevention roller 73 is rotatably supported by a rotating shaft extending in the X-axis direction. The outer peripheral surface of the levitation prevention roller 73 is arranged so as to sandwich the flange portion 72 with the bottom plate 74. With the above configuration, in the slide mechanisms 70A and 70B, the floating prevention roller 73 restricts the movement of the guided member 71 and the flange portion 72 in the X-axis direction and the Z-axis direction, and is restricted in the Y-axis direction. Movement is allowed.

As shown in FIGS. 2 and 8, the damper mechanism 80 includes a mounting portion 83, a cylinder 81, a rod 84, and a mounting portion 82. In FIG. 8, the slide mechanism 70B and the link mechanism 60 are omitted for the sake of explanation. The mounting portion 83 is fixed to the positive end of the beam 12B in the X-axis direction, and extends downward at the position of the positive end of the cylinder 81 in the Y-axis direction. An end portion of the cylinder 81 on the positive side in the Y-axis direction is attached to the attachment portion 83. The mounting portion 82 extends upward at the position of the negative end portion of the base portion 41 in the Y-axis direction. The end of the rod 84 on the negative side in the Y-axis direction is attached to the attachment portion 82. The cylinder 81 is a cylindrical member extending in the Y-axis direction. The rod 84 is a shaft member extending in the Y-axis direction, part of which is housed inside the cylinder 81 so as to be reciprocating in the Y-axis direction. In the damper mechanism 80, the cylinder 81 attached to the attachment portion 83 and the rod 84 attached to the attachment portion 82 move relatively in the Y-axis direction due to vibration during an earthquake. At this time, the damper mechanism 80 damps the vibration in the cylinder 81. The fixing portion of the mounting portion 83 is not limited to the end portion in the X-axis direction.

As shown in FIGS. 2 and 3, the link mechanism 60 includes a link member 61, a support member 64, and a support member 66. The support member 64 and the support member 66 function as a switching mechanism 100 for switching between the first mode and the second mode of the seismic isolation unit 40. Details of the switching mechanism 100 will be described later.

The link member 61 is arranged so as to extend in the vertical direction at the negative end portion of the beam 12B and the base portion 41 in the Y-axis direction. The support member 64 is fixed to the end face on the negative side of the beam 12B in the Y-axis direction. The support member 64 includes a pair of support portions 64a that sandwich the upper end portions of the link member 61 from both sides in the X-axis direction. A shaft member 67 extending in the X-axis direction and penetrating the link member 61 is provided between the pair of support portions 64a. As a result, the upper end of the link member 61 is rotatably supported by the shaft member 67. The through hole at the upper end of the link member 61 is formed in the shape of an elongated hole extending along the extending direction of the link member 61, and the shaft member 67 is relative to the link member 61 along the extending direction. Allows you to move. The support member 66 is fixed to the end of the base portion 41 on the negative side in the Y-axis direction. A pair of support members 66 are provided so as to sandwich the lower end portions of the link member 61 from both sides in the X-axis direction. A shaft member 68 extending in the X-axis direction and penetrating the link member 61 is provided between the pair of support members 66. As a result, the lower end of the link member 61 is rotatably supported by the shaft member 67.

Further, the link mechanism 60 includes a bracket (first member) 63 and a bracket (second member) 62 that sandwiches the bracket 63. The bracket 63 is fixed to the end surface on the negative side of the base portion 41 in the Y-axis direction and extends upward. The pair of brackets 62 are provided near the lower end of the link member 61. The pair of brackets 62 are arranged so as to sandwich the brackets 63 from both sides in the X-axis direction. As a result, the bracket 63 and the pair of brackets 62 are in a state of being overlapped in the X-axis direction.

With the above structure, the seismic isolation portion 40 enables the lower main body portion 12 to move relative to the traveling portion 20 in the Y-axis direction. That is, when the lower main body portion 12 moves relative to the traveling portion 20, it moves in the Y-axis direction by being guided by the slide mechanisms 70A and 70B. At this time, the rod 84 of the damper mechanism 80 advances and retreats in the Y-axis direction with respect to the cylinder 81 to damp the vibration (see FIG. 8). Further, as shown in FIG. 3, the laminated rubber 53 of the seismic isolation rubber 50 is deformed so as to be inclined as the lower main body portion 12 moves relative to the traveling portion 20 in the Y-axis direction. This attenuates the vibration. Further, in the link member 61 of the link mechanism 60, as the lower main body portion 12 moves relative to the traveling portion 20 in the Y-axis direction, the upper end portion and the lower end portion are around the shaft members 67 and 68. Rotate. At this time, the pair of brackets 62 move relative to the brackets 63 fixed to the base portion 41 as the link member 61 moves.

Here, at the time of a large earthquake, a large short-period tremor occurs in the initial stage, and after a certain period of time, the long-period tremor may arrive with a delay. On the other hand, the seismic isolation unit 40 has a first mode corresponding to the vibration of the first cycle (short cycle) and a vibration of the second cycle (long cycle) which is a cycle longer than the first cycle. It is configured so that it can be switched between the corresponding second mode. The seismic isolation unit 40 switches in the order of the first mode and the second mode. Here, the first mode is a mode in which the seismic isolation function of the seismic isolation unit 40 is activated in order to attenuate the vibration of the first period (short period). The second mode is a mode in which the occurrence of resonance due to substantially matching between the vibration wave of the second period (long period) and the natural period of the cargo handling device 1 is suppressed. The switching mechanism 100 will be described in detail with reference to FIGS. 4 to 6. FIG. 4 is a schematic view showing the state of the switching mechanism during normal operation in which no earthquake has occurred. FIG. 5 is a schematic view showing a state of the switching mechanism in the first mode. FIG. 6 is a schematic view showing a state of the switching mechanism in the second mode.

As shown in FIGS. 4 to 6, in the switching mechanism 100, through holes 63a and 63b are formed in the bracket 63, and through holes 62a and 62b are formed in the pair of brackets 62, respectively. During normal operation, the through hole 63a of the bracket 63 and the through hole 62a of the pair of brackets 62 communicate with each other so that their central axes coincide with each other (see FIG. 4). The positional relationship between the through holes 62a and 63a and the through holes 62b and 63b is not particularly limited. The switching mechanism 100 includes a first shear pin 101, a second shear pin 102, a drive unit 103 for driving the second shear pin 102, and a control unit 110 for controlling the drive unit 103.

The first shear pin 101 is inserted into the bracket 63 and the pair of brackets 62 in a superposed state. The first shear pin 101 is inserted into the through hole 63a of the bracket 63 and the through hole 62a of the pair of brackets 62. The first shear pin 101 breaks when the first mode is entered (see FIG. 5).

The second shear pin 102 is configured to be insertable into the bracket 63 and the pair of brackets 62 in a superposed state. The second shear pin 102 is inserted into the through hole 63b of the bracket 63 and the through hole 62b of the pair of brackets 62 when the second mode is set (see FIG. 6). The second shear pin 102 is inserted into the through holes 62b and 63b by applying a driving force from the driving unit 103 at a predetermined timing based on the control signal of the control unit 110. During normal operation and in the first mode, the second shear pin 102 stands by while being inserted only into the through hole 62b of one of the brackets 62.

The drive unit 103 advances and retreats the second shear pin 102 with respect to the through holes 62b and 63b. The drive unit 103 is not particularly limited as long as it can drive the second shear pin 102, but is composed of, for example, a hydraulic cylinder. The control unit 110 controls the operation of the drive unit 103. The control unit 110 controls the drive unit 103 at the timing of switching from the first mode to the second mode. Further, the control unit 110 controls the drive unit 103 at the timing when the bracket 63 and the bracket 62 return to the origin position and the through hole 63b and the through hole 62b communicate with each other. The timing at which the control unit 110 switches from the first mode to the second mode is not particularly limited, but the second mode is after a preset set time has elapsed after the first shear pin 101 is broken. You may switch to. The set time is set in consideration of the arrival time of long-period earthquakes based on the observation results of past earthquakes. Alternatively, the control unit 110 may control the drive unit 103 based on the fact that the shaking of a long-period earthquake is actually detected by a seismograph or the like.

Next, the operation of the switching mechanism 100 will be described. First, as shown in FIG. 4, during normal operation, the first shear pin 101 is inserted into the through holes 62a and 63a. This restricts movement between the bracket 63 and the pair of brackets 62. As a result, the rotation of the link member 61 with respect to the support members 64 and 66 is restricted, so that the relative movement between the lower main body portion 12 and the traveling portion 20 is restricted. That is, the seismic isolation function of the seismic isolation unit 40 is stopped. During normal operation, the second shear pin 102 is in a retracted state with respect to the through hole 63b. Here, the tip of the second shear pin 102 is inserted only into one of the through holes 62b.

Next, in the state immediately after the occurrence of the earthquake, as shown in FIG. 5, a large shearing force is generated between the bracket 63 and the pair of brackets 62 due to the occurrence of large shaking in the first period (short period). Occurs. As a result, the first shear pin 101 is broken. At this time, of the first shear pin 101, the portion located at the boundary between one bracket 62 and the bracket 63 is broken, and the portion located at the boundary between the other bracket 62 and the bracket 63 is broken. In the first shear pin 101, a small diameter portion having a reduced diameter is formed at a position where the fracture is planned, so that the shear pin 101 is easily broken. As a result, the portion 101a corresponding to the end region of the first shear pin 101 remains in the through hole 62a, and the portion 101c corresponding to the central region of the first shear pin 101 remains in the through hole 63a. Further, in the state immediately after the occurrence of the earthquake, the second shear pin 102 is in a state of being retracted from the through hole 63b. As a result, the link member 61 can rotate with respect to the support members 64 and 66, so that the lower main body portion 12 can move relative to the traveling portion 20. That is, the seismic isolation function of the seismic isolation unit 40 is activated. In this way, the seismic isolation unit 40 switches from the normal operation state to the first mode.

Next, when a predetermined time elapses from the occurrence of the earthquake and the shaking of the second cycle (long cycle) arrives, as shown in FIG. 6, the control unit 110 drives the drive unit 103 to perform the second operation. The shear pin 102 of 2 is inserted into the through holes 62b and 63b. This restricts movement between the bracket 63 and the pair of brackets 62. As a result, the rotation of the link member 61 with respect to the support members 64 and 66 is restricted, so that the relative movement between the lower main body portion 12 and the traveling portion 20 is restricted. That is, the seismic isolation function of the seismic isolation unit 40 is stopped. In this way, the seismic isolation unit 40 switches from the first mode to the second mode.

Next, the operation / effect of the cargo handling device 1 according to the present embodiment will be described.

According to the cargo handling device 1 according to the present embodiment, the seismic isolation unit 40 is subjected to the first mode corresponding to the vibration of the first cycle and the vibration of the second cycle which is a cycle longer than the first cycle. It is configured so that it can be switched between the corresponding second mode. Further, the seismic isolation unit 40 switches in the order of the first mode and the second mode. Therefore, the seismic isolation unit 40 is set to the first mode corresponding to the vibration of the first cycle for the vibration of the first cycle of the short cycle immediately after the occurrence of the earthquake. On the other hand, for the vibration of the second cycle of the long cycle that occurs after the short cycle, the seismic isolation unit 40 is set to the second mode corresponding to the vibration of the second cycle. As described above, the vibration can be suppressed according to the frequency that changes with the passage of time.

In the cargo handling device 1, the seismic isolation unit 40 is inserted into the bracket 62 and the bracket 63 that move relative to each other with vibration, and the bracket 62 and the bracket 63 in a superposed state, and is in the first mode. It includes a first shear pin 101 that sometimes breaks, and a second shear pin 102 that can be inserted into the bracket 62 and the bracket 63 in a superposed state. Further, the seismic isolation unit 40 changes from the first mode to the second mode by inserting the second shear pin 102 into the bracket 62 and the bracket 63 in the overlapped state after the first mode is set. Make a switch. As a result, in the first mode, the restraint between the bracket 62 and the bracket 63 is released by breaking the first shear pin 101. Therefore, the seismic isolation unit 40 can exert a seismic isolation function on vibration. On the other hand, in the second mode, the second shear pin 102 is inserted into the bracket 62 and the bracket 63 in the overlapped state. As a result, the relative movement between the bracket 62 and the bracket 63 is restricted, so that the seismic isolation function of the seismic isolation unit 40 is stopped. Therefore, even if the relationship between the vibration of the second period of the long period and the natural period of the cargo handling device 1 in the state where the seismic isolation function of the seismic isolation unit 40 is operating is established, the exemption is established. By stopping the seismic isolation function of the seismic unit 40, it is possible to avoid the vibration of the cargo handling device 1 from becoming large.

In the cargo handling device 1, the seismic isolation unit 40 switches to the second mode after a preset set time has elapsed after the first shear pin 101 is broken. As a result, the seismic isolation unit 40 can easily switch from the first mode to the second mode without providing a special sensor for measuring seismic waves.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments.

For example, in the above-described embodiment, the hydraulic cylinder is used as the drive unit, but any means may be used as long as the second shear pin can be driven. For example, as shown in FIG. 7, a drive unit using a spring mechanism may be adopted. The drive unit includes a spring 107 capable of applying an elastic force to the second shear pin 102, and a support portion 106 that supports the spring 107 on the opposite side of the second shear pin 102. In the configuration shown in FIG. 7, as shown in FIG. 7A, the central axes of the through hole 63b and the through hole 62b do not coincide with each other during normal operation. Therefore, the tip of the second shear pin 102 is pressed against the side surface of the bracket 63 while being inserted into one of the through holes 62b. In the first mode, since the vibration cycle is short, the amplitude of the bracket 63 is also small, and the second shear pin 102 is not inserted into the through hole 63b. On the other hand, in the second mode, since the vibration cycle is long, the amplitude of the bracket 63 becomes large. As a result, as shown in FIG. 7B, the central axes of the through hole 63b and the through hole 62b coincide with each other, and the second shear pin 102 is inserted into the through holes 62b and 63b by the elastic force of the spring 107. As described above, as in the switching mechanism 100 shown in FIG. 7, the mode may be switched from the first mode to the second mode by a mechanical mechanism without using a control unit.

Further, a switching mechanism that does not use the second shear pin may be adopted. For example, as shown in FIG. 8, the damper mechanism 80 may be used to switch from the first mode to the second mode. As shown in FIG. 8, the pump 87 and the valve 86 are connected to the cylinder 81. In the first mode, as shown in FIG. 8B, the damper mechanism 80 operates the damping function of the seismic isolation portion 40 by expanding and contracting the cylinder 81 and the rod 84 in accordance with the vibration. On the other hand, when switching to the second mode, the valve 86 is closed at the position shown at the origin position (FIG. 8A). As a result, the cylinder 81 and the rod 84 stop at the origin position, so that the seismic isolation function of the seismic isolation unit 40 is stopped.

Further, the first member and the second member for inserting the shear pins 101 and 102 do not have to be provided in the link mechanism as in the above-described embodiment. That is, the first member and the second member can move relative to each other with vibration, and the seismic isolation function of the seismic isolation portion can be stopped when the shear pins 101 and 102 are inserted. For example, any structure may be used.

Further, the overall configuration of the cargo handling device may also be modified without changing the gist of the present invention. For example, in the above-described embodiment, both the seismic isolation unit 30 and the seismic isolation unit 40 are configured so that the first mode and the second mode can be switched. Instead, only one of the seismic isolation unit 30 and the seismic isolation unit 40 may be configured so that the first mode and the second mode can be switched. Further, either one of the seismic isolation unit 30 and the seismic isolation unit 40 may be omitted.

Further, the girder section 3 is not an indispensable configuration, and may be applied to a cargo handling device that does not include the girder section 3. For example, when applied to a traveling jib crane, a jib is provided instead of the girder portion 3.

1 ... Cargo handling device, 10 ... Main body, 11 ... Upper main body (first part, second part), 12 ... Lower main body (first part, second part), 20 ... Running part (1st part, second part) Second part), 30, 40 ... Seismic isolation part, 62 ... Bracket (second member), 63 ... Bracket (first member), 101 ... First shear pin, 102 ... Second shear pin.

Claims (2)

The main body divided into the first part on the upper end side and the second part on the lower end side,
A seismic isolation portion provided between the first portion and the second portion and capable of relative movement of the first portion in a predetermined direction with respect to the second portion is provided.
The seismic isolation section
The first mode corresponding to the vibration of the first period and
It is configured to be switchable between the second mode corresponding to the vibration of the second cycle, which is a cycle longer than the first cycle.
The seismic isolation unit is a cargo handling device that switches between the first mode and the second mode in this order.
The seismic isolation section
A first member and a second member that move relative to each other with vibration,
A first shear pin that is inserted into the first member and the second member in a superposed state and breaks when the first mode is entered.
The first member in a superposed state and a second shear pin that can be inserted into the second member are provided.
By inserting the second shear pin into the first member and the second member in a superposed state after the first shear pin is broken, the first mode to the second mode to switch to, cargo handling equipment. The cargo handling device according to claim 1 , wherein the seismic isolation unit switches to the second mode after a preset set time has elapsed after the first shear pin is broken.

Images