JP7220094B2 - Crane collision mitigation device and crane device - Google Patents

Description

The present disclosure relates to crane crash mitigation devices and crane apparatus.

Crane devices such as overhead cranes and stacker cranes are widespread. These crane devices have a moving body that travels horizontally along rails while supporting slings.

For example, Patent Literature 1 discloses a configuration in which a crane traveling along a crane rail is stopped by a damper. This damper is fixed at the end position of the rail and attenuates the shock caused by the collision of the crane.

Japanese Utility Model Laid-Open No. 4-117889

However, moving bodies (for example, girders, trolleys, hoists, cranes, etc.) that move along rails differ in moving speed during normal use and during an earthquake. When an earthquake occurs, the moving speed of the moving body may become faster than during normal use.

In this regard, in the configuration of Patent Document 1, if the damper is designed based on the moving speed of the moving object during normal use, the damper cannot sufficiently attenuate the impact against the moving speed of the moving object when an earthquake occurs. There is fear.

On the other hand, if the damper is designed based on the moving speed of the moving body when an earthquake occurs, the damper becomes large, and the installation of the damper reduces the movable range of the moving body.

As described above, it may be difficult to simultaneously attenuate the impact in the event of an earthquake and secure the movable range of the movable body during normal use with a single damper.

In view of the above circumstances, it is an object of at least one embodiment of the present invention, in a crane apparatus, to simultaneously attenuate impacts in the event of an earthquake and ensure a movable range of a movable body during normal use.

(1) A crane collision mitigation device according to at least one embodiment of the present invention includes:
Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. a shock absorber for damping the movement speed of the moving body toward the object to be avoided when the moving body reaches an operating position located on the front side in the longitudinal direction of the rail from the object to be avoided;
Provided on the moving body or the object to be avoided, has a viscous resistor inside, and has a speed of movement of the moving body toward the object to be avoided at a position on the front side of the rail in the longitudinal direction from the operating position a damper to start damping;
Prepare.

According to the configuration (1) above, the drag force of the damper having the viscous resistor inside increases as the stroke speed (that is, the moving speed of the moving body) increases. For example, if the Reynolds number is small, the damper's drag force is proportional to its stroke speed. For large Reynolds numbers, the damper drag is proportional to the square of its stroke speed.

Therefore, when the moving body moves at a moving speed (relatively low speed) in normal use, the damper's resistance is small, so the moving body can move to the operating position of the shock absorber. In addition, since the drag force of the shock absorber is further applied at the operating position, the movable body can be stopped. In other words, in normal use, installation of the damper does not excessively reduce the movable range of the moving body, and the shock absorber can stop the moving body.

On the other hand, when the moving object moves at a moving speed (relatively high speed) at the time of an earthquake, the damper attenuates the moving speed of the moving object with a large drag force on this side of the rail in the longitudinal direction from the operating position of the shock absorber. Further, when the moving body reaches the operating position of the shock absorber, the drag force of the shock absorber is further applied to attenuate the moving speed of the moving body. Therefore, even when an earthquake occurs, the impact of the moving body can be sufficiently attenuated.

Therefore, it is possible to both attenuate the impact in the event of an earthquake and ensure the movable range of the moving body during normal use.

(2) In some embodiments, in the configuration of (1) above, the shock absorber is another damper having the viscous resistance inside the damper, and the damper and the other damper are fluid. including two filled internal spaces and at least one orifice communicating with the two internal spaces, wherein at least one of the opening area of the orifice, the viscosity of the fluid, and the density of the fluid is different from each other have different attenuation constants.

The damping constant of the damper varies with the orifice opening area, the viscosity of the fluid, and the density of the fluid. Therefore, according to the configuration (2) above, the damper and the other damper are configured so that at least one of the orifice opening area, the fluid viscosity, and the fluid density is different from each other, thereby damping them. A constant difference can be easily set.

(3) In some embodiments, in the configuration of (1) or (2) above, the damper is provided on the moving body and includes a piston rod projecting from the moving body on both sides in the longitudinal direction of the rail. and a biasing member biasing the piston rod toward both sides of the rail in the longitudinal direction so that the piston rod moves toward the origin position.

According to the configuration (3) above, the damper can attenuate impacts on both sides in the longitudinal direction of the rail of the moving body by the piston rods projecting from the moving body on both sides in the longitudinal direction of the rail. Therefore, the number of parts can be reduced compared to the case where dampers are provided on both sides of the moving body and the case where dampers are provided on both end positions of the rail. In addition, since the stroke is restored by the urging by the urging member, the impact can be attenuated even if the collision occurs repeatedly.

(4) In some embodiments, in the configuration of any one of (1) to (3) above, the moving body is provided with wheels for traveling along the rails and on top of the wheels. and a trolley, wherein the damper is provided at the same height position as the wheel with respect to the moving body.

With configuration (4) above, the damper is provided at the same height position as the wheels of the moving body, so the center of gravity of the moving body is lowered. As a result, it is possible to stabilize the running of the moving body.

(5) In some embodiments, in the configuration of (4) above, the damper in the moving body is more damped than the damper so as to contact the object to be avoided and not the damper at the time of collision. It is provided at a low position, and the shock absorber is provided at a position where it contacts the trolley at the time of collision in the object to be avoided.

According to the configuration (5) above, since the damper and the shock absorber are configured so as not to come into contact with each other, it is possible to reduce the risk of unstable running of the moving body due to their contact.

(6) In some embodiments, in the configuration of any one of (1) to (3) above, the moving body is provided with wheels for traveling along the rails and under the wheels. and a hoist, wherein the damper is provided at the same height position as the wheel with respect to the moving body.

According to the configuration (6) above, since the damper is provided at the same height position as the wheels of the mobile body, it is difficult for a moment to occur with the position of the wheel as a fulcrum, and the running of the mobile body can be stabilized. .

(7) In some embodiments, in the configuration of (6) above, the damper in the moving object is damper than the damper so as to contact the object to be avoided and not the damper at the time of collision. Provided at a high position, the shock absorber is provided at a position of the object to be avoided where it contacts the hoist in the event of a collision.

According to the configuration (7) above, since the damper and the shock absorber are configured so as not to come into contact with each other, it is possible to reduce the risk of unstable running of the moving body due to their contact.

(8) In some embodiments, in the configuration of any one of (1) to (7) above, the damper is configured to be able to control a damping constant.

According to the configuration (8) above, it is possible to change the attenuation constant according to the situation. For example, if more damping is desired, the damping constant can be increased.

(9) In some embodiments, in the configuration of (8) above, the damper increases the damping constant more than normal when an earthquake occurs, based on the earthquake detection signal.

According to the configuration (9) above, when an earthquake occurs, the moving speed of the moving body can be damped with a larger damping constant than in normal times. In addition, since the damping constant is smaller in normal times than in the case of an earthquake, it is possible to ensure the movable range of the movable body during normal use.

(10) In some embodiments, in the configuration of any one of (1) to (9) above, the damper includes two internal spaces filled with fluid and at least an orifice; and an opening control mechanism configured to change the open state of one or more of the at least one orifice.

According to the configuration (10) above, it is possible to easily control the attenuation constant with a simple configuration.

(11) A crane collision mitigation device according to at least one embodiment of the present invention includes:
Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. comprising a damper for damping the moving speed of the moving body toward the object to be avoided;
The damper has a viscous resistor inside, and increases the damping constant more than usual when an earthquake occurs based on the earthquake detection signal.

According to the configuration (11) above, the damper normally damps the moving body with a small damping constant, and damps the moving body with a large damping constant when an earthquake occurs. Therefore, even when an earthquake occurs, it is possible to sufficiently attenuate the impact of the moving body. Also, since the damper normally has a small damping constant, it is possible to suppress a decrease in the movable range due to installation.

(12) A crane device according to at least one embodiment of the present invention,
a rail;
a hanging tool;
a moving body that travels along the rails while supporting the slings;
A collision mitigation device for a crane according to any one of (1) to (11) above.

According to the configuration of (12) above, the collision mitigation device for a crane according to any one of (1) to (11) above dampens the impact of the moving body in the event of an earthquake and reduces the impact on the moving body during normal use. It is possible to ensure both the movable range of

Advantageous Effects of Invention According to at least one embodiment of the present invention, in a crane device, it is possible to both attenuate impacts in the event of an earthquake and ensure a movable range of a movable body during normal use.

1 is a schematic side view of a crane apparatus according to one embodiment of the present invention; FIG. It is a schematic sectional view showing the structure of the damper of the crane device according to one embodiment. It is a schematic sectional view showing the structure of the damper of the crane device according to one embodiment. FIG. 10 is a schematic diagram showing a state in which the moving body is located on the front side in the longitudinal direction of the rail from the operating position; FIG. 4 is a schematic diagram showing a state in which the moving body has reached the operating position; 1 is a schematic side view of a crane apparatus according to one embodiment of the present invention; FIG.

Several embodiments of the present invention will now be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, expressions that express shapes such as squares and cylinders do not only represent shapes such as squares and cylinders in a geometrically strict sense, but also include irregularities and chamfers to the extent that the same effect can be obtained. The shape including the part etc. shall also be represented.
On the other hand, the expressions "comprising", "comprising", "having", "including", or "having" one component are not exclusive expressions excluding the presence of other components.

FIG. 1 is a schematic side view of a crane apparatus 100 according to one embodiment of the invention. The crane device 100 is, for example, an overhead crane. As shown in FIG. 1, a crane apparatus 100 includes a horizontally extending rail 10, a sling 20 for hoisting an object, a moving body 30 that travels along the rail 10 while supporting the sling 20, and a moving body 30. a crane crash mitigation device 40 for mitigating the crash of the body 30;

In one embodiment, the moving body 30 includes a plurality of wheels 3 for traveling along the rails 10 and a trolley 4 provided on top of the plurality of wheels 3 . Wheels 3 are provided on each of the front, rear, left, and right sides of the moving body 30 , and the moving body 30 includes four wheels 3 . Note that the moving body 30 may include one or more wheels 3 . For example, the mobile body 30 may be provided with wheels 3 on each of the left and right sides, and the mobile body 30 may include two wheels.

Note that the rail 10 shown in FIG. 1 is a girder, and the moving body 30 is an object that travels along the girder while directly supporting the sling 20 . However, the moving body 30 may be a girder that travels while indirectly supporting the sling 20 . An object traveling along the girder is, for example, an object including the trolley 4, a hoist 8, which will be described later, and the like. The rail 10 may be a rail on which a girder runs instead of a girder.

Frames 12 are provided at the end positions of the rails 10, respectively. A collision mitigation device 40 for a crane includes a shock absorber 41 and a damper 42 for attenuating the moving speed of the moving body 30 when moving toward the object to be avoided. In this embodiment, the object to be avoided is the frame 12 . Note that the object to be avoided is not limited to the frame 12 and may be any object that should avoid colliding with the moving object 30 . For example, the object to be avoided may be a wall of a building in which the crane device 100 is installed. Also, objects to be avoided are not limited to objects positioned at the end positions of the rail 10, but may be objects positioned at least on one end side of the movable range of the moving body 30 traveling on the rail 10. FIG.

The buffer 41 is provided on the object to be avoided, that is, the frame 12 . In this embodiment, the damper 41 is a buffer such as a spring damper, a friction damper, a rubber damper, a hydraulic damper, or an air damper. The buffer 41 may be a damper having a viscous resistor inside.

The buffer 41 attenuates the moving speed of the moving body 30 toward the frame 12 when the moving body 30 reaches the operating position. The operating position is the position where damper 41 starts damping. The operating position of the shock absorber 41 is located on the front side in the longitudinal direction of the rail 10 from the object to be avoided. Here, "the front side of the rail 10 in the longitudinal direction" means the front side of the moving body 30 traveling along the longitudinal direction of the rail 10 when the traveling destination is viewed. For example, as shown in FIG. 1, when the moving body 30 is moving in the direction of the arrow A1, the "front side of the rail 10 in the longitudinal direction" is between the frame 12 on the left side in the drawing and the moving body 30. It means a position closer to the moving body 30 .

A damper 42 is provided on the moving body 30 . For example, the damper 42 is provided at the same height position as the wheels 3 in the moving body 30 . The damper 42 has a viscous resistor inside, and starts damping the moving speed of the moving body 30 toward the frame 12 at a position on the front side of the rail 10 in the longitudinal direction from the operating position of the damper 41 .

The configuration of the collision mitigation device 40 for the crane is not limited to the example described above. For example, the dampener 41 may be provided on the moving body 30 rather than the avoidance object (eg, the frame 12), and in the actuated position begin to dampen the speed of movement of the moving body 30 toward the avoidance object. Also, the damper 42 is provided on an object to be avoided (for example, the frame 12) instead of the moving object 30, and the damper 42 moves toward the object to be avoided at a position on the front side in the longitudinal direction of the rail 10 from the operating position of the damper 41. may start slowing down.

In this manner, the collision mitigation device 40 for the crane may be constructed so that the shock absorber 41 operates at the operating position and the damper 42 operates on the front side of the operating position. That is, it is sufficient that the damper 42 operates before the shock absorber 41 operates. Therefore, the positional relationship between the shock absorber 41 and the damper 42 can be changed as appropriate.

The damper 42 is provided in the moving body 30 at a position that contacts the frame 12 at the time of collision. The shock absorber 41 is provided on the frame 12 at a position where it comes into contact with the trolley 4 upon collision. The damper 42 is provided at a position lower than the damper 41 so as not to come into contact with the damper 41 upon collision. The stroke length of damper 42 is configured to partially overlap the stroke length of damper 41 .

Here, the configuration of the damper 42 will be described in detail. FIG. 2 is a schematic cross-sectional view showing the configuration of the damper 42 (42a) of the crane device 100 according to one embodiment. As shown in FIG. 2, the damper 42 (42a) includes the piston rod 1, the cylinder tube 2 through which the piston rod 1 is axially movably inserted, and the piston rod 1 in the longitudinal direction of the rail 10 (that is, the piston rod). and a biasing member 5 that biases from both sides in the axial direction of 1). The inside of the cylinder tube 2 is filled with fluid. The cylinder tube 2 is fixed to the mobile body 30 .

The piston rod 1 includes two extending portions 1a and 1b extending in a direction perpendicular to the axial direction, and an extending portion 1c extending in the cylinder tube 2 in a direction perpendicular to the axial direction. The extension 1c divides the interior of the cylinder tube 2 into two, and the interior of the cylinder tube 2 is formed with two internal spaces filled with fluid. The extension 1c includes at least one orifice 6 that communicates the two internal spaces. The extension 1c is configured to separate the two internal spaces in a portion other than the orifice 6 so that the fluid does not move.

The biasing member 5 is an elastic body such as a double torsion spring or return spring. For example, as shown in FIG. 2, the biasing member 5 is composed of springs 5a and 5b provided on both sides of the cylinder tube 2 in the axial direction. The spring 5 a is provided between one axial end surface of the cylinder tube 2 and the extension portion 1 a of the piston rod 1 , and the spring 5 b is provided between the other axial end surface of the cylinder tube 2 and the extension portion 1 a of the piston rod 1 . It is provided between the existing portion 1b.

The springs 5a and 5b bias the extension 1c of the piston rod 1 toward the origin position. The origin position is a position where the biasing force of the biasing member 5 is balanced in the axial direction, and is a position in which the strokes on both sides of the damper 42 (42a) in the axial direction are restored. For example, the spring 5a is configured to urge the cylinder tube 2 and the extending portion 1a in a direction to separate them, and the spring 5b is configured to urge the cylinder tube 2 and the extending portion 1b in a direction to separate them. Alternatively, the spring 5a may bias the cylinder tube 2 and the extension portion 1a in the direction to bring them together, and the spring 5b may bias the cylinder tube 2 and the extension portion 1b in the direction to bring them together. .

The damper 42 ( 42 a ) is provided on the moving body 30 so that the axial direction of the piston rod 1 is parallel to the longitudinal direction of the rail 10 . Further, as shown in FIG. 1, the piston rod 1 is configured to protrude from the moving body 30 to both sides (front side and back side) of the rail 10 in the longitudinal direction.

The damper 42 may be configured to be able to control the damping constant. Damper 42 may be configured with a variable orifice. An example will be described below. FIG. 3 is a schematic cross-sectional view showing the configuration of the damper 42 (42b) of the crane device 100 according to one embodiment.

As shown in FIG. 3, the damper 42 (42b) has at least one orifice 6 that communicates two internal spaces in the cylinder tube 2, and changes the opening state of one or more of the at least one orifices 6. an aperture control mechanism 7 configured to allow the opening of the opening control mechanism 7; The opening control mechanism 7 may be an on-off valve that opens and closes the opening of the orifice 6 or a flow control valve that increases or decreases the opening area of the orifice 6 .

The opening control mechanism 7 of the damper 42 (42b) increases the damping constant at the time of occurrence of an earthquake based on the earthquake detection signal. The earthquake detection signal is a detection signal indicating the occurrence of an earthquake. For example, the damper 42 (42b) is configured to receive an earthquake detection signal from a seismometer 50 provided outside the moving body 30 through wired communication or wireless communication. Note that the damper 42 (42b) may acquire the detection signal as the earthquake detection signal when the accelerometer provided in the moving body 30 detects acceleration equal to or greater than a predetermined value.

FIG. 4 is a schematic diagram showing a state in which the moving body 30 is located on the near side in the longitudinal direction of the rail from the operating position. In FIG. 4, moving body 30 is moving in the direction of arrow A1 (that is, the direction toward frame 12 on the left side in the figure) as compared with FIG.

At the position of the moving body 30 shown in FIG. 4, the piston rod 1 of the damper 42 is in contact with the frame 12 . Since the moving body 30 has not yet reached the operating position, it is not in contact with the shock absorber 41 . Therefore, only the damper 42 operates in this state.

FIG. 5 is a schematic diagram showing a state in which the moving body 30 has reached the operating position. In FIG. 5, moving body 30 is further moving in the direction of arrow A1 as compared with FIG.

In the working position the buffer 41 rests against the trolley 4 of the mobile body 30 . Therefore, in this state, the buffer 41 operates. It should be noted that the piston rod 1 of the damper 42 is in contact with the frame 12 even at this operating position. That is, the damper 42 continues to operate from the position where the piston rod 1 contacts the frame 12 .

As described above, the collision mitigation device 40 for a crane according to one embodiment is positioned on at least one end side of the movable range of the moving body 30 traveling on the rail 10, as shown in FIG. A moving body 30 provided on an object to be avoided (a frame 12) to avoid a collision and heading toward the object to be avoided when the moving body 30 reaches an operating position located in front of the object to be avoided in the longitudinal direction of the rail 10. is provided with a buffer 41 that attenuates the moving speed of the Further, the collision mitigation device 40 of the crane is provided on the moving body 30, has a viscous resistance body inside, and moves toward the object to be avoided at a position on the front side in the longitudinal direction of the rail 10 from the operating position of the shock absorber 41. A damper 42 is provided to start damping the movement speed of the body 30 . Note that the damper 41 may be provided on the moving body 30 and the damper 42 may be provided on the object to be avoided.

According to such a configuration, the drag force of the damper 42 having the viscous resistor inside increases as the stroke speed (that is, the moving speed of the moving body 30) increases. For example, when the Reynolds number is small, the drag force of the damper 42 is proportional to its stroke speed. When the Reynolds number is large, the drag of damper 42 is proportional to the square of its stroke speed.

Therefore, when the moving body 30 moves at a moving speed (relatively low speed) at the time of normal use, the damper 42 has a small drag force, so the moving body 30 can move to the operating position of the damper 41 . Moreover, since the drag force of the shock absorber 41 is further applied at the operating position, the moving body 30 can be stopped. In other words, during normal use, installation of the damper 42 does not excessively reduce the movable range of the moving body 30 , and the buffer 41 can stop the moving body 30 .

On the other hand, when the moving body 30 moves at the moving speed (relatively high speed) at the time of an earthquake, the damper 42 attenuates the moving speed with a large drag at a position on the front side of the rail longitudinal direction from the operating position of the shock absorber 41. Let Further, when the moving body 30 reaches the operating position of the damper 41 , the drag force of the damper 41 is further applied to attenuate the moving speed of the moving body 30 . Therefore, even when an earthquake occurs, the impact of the moving body 30 can be sufficiently attenuated.

Therefore, it is possible to both attenuate the impact when an earthquake occurs and secure the movable range of the moving body 30 during normal use.

In some embodiments, the crane crash mitigation device 40 may comprise more than two dampers (including dampers 41 or dampers 42), each configured to operate at a different position. In this case, the degree of freedom in design is increased, and it is possible to configure so as not to hinder normal operation.

In some embodiments, the damper 41 is another damper having a viscous resistor inside, and the damper 42 and the other damper being the damper 41 comprise two fluid-filled interior spaces and two At least one orifice 6 communicating with two internal spaces may be included, and at least one of the opening area of the orifice 6, the viscosity of the fluid, and the density of the fluid may have different damping constants.

For example, the drag force D of a damper having a viscous resistor inside (the damper 42 and the damper 41 in the above example) is determined by the relational expression D=ρV ² SC/2 when the Reynolds number is large. where ρ is the density of the fluid, V is the relative velocity between the object and the fluid, S is the projected area of the object, and C is the drag coefficient. The drag coefficient C changes with the viscosity of the fluid. The relative speed V corresponds to the stroke speed of the damper (that is, the moving speed of the moving body 30). The projected area S corresponds to the opening area of the orifice 6 . Therefore, the drag force D of the damper changes and the damping constant changes depending on the opening area of the orifice 6, the viscosity of the fluid, and the density of the fluid.

When the Reynolds number is small, the damper drag D is determined by a relational expression proportional to the relative speed V, not the relational expression proportional to the square of the relative speed V described above. In this case as well, the drag force D of the damper changes depending on the density ρ of the fluid, the projected area S, and the viscosity of the fluid, as in the case of a large Reynolds number.

Therefore, according to the above configuration, by configuring the damper 42 and another damper that is the buffer 41 such that at least one of the opening area of the orifice 6, the viscosity of the fluid, and the density of the fluid is different from each other, The difference in their damping constants can be easily set.

In some embodiments, as shown in FIGS. 2 and 3, the damper 42 is provided on the moving body 30, the piston rod 1 projecting from the moving body 30 to both longitudinal sides of the rail 10, and the piston rod 1 biasing members 5 biasing the piston rod 1 to both longitudinal sides of the rail 10 toward the origin position.

According to such a configuration, the damper 42 can attenuate the impact on both sides of the rail 10 of the moving body 30 in the longitudinal direction by the piston rod 1 projecting from the moving body 30 to both sides of the rail 10 in the longitudinal direction. Therefore, the number of parts can be reduced as compared with the case where the dampers 42 are provided on both sides of the moving body 30 or the dampers 42 are provided at both end positions of the rail 10 . In addition, since the stroke of the damper 42 is restored by the urging of the urging member 5, the impact can be attenuated even if the collision occurs repeatedly.

In some embodiments, as shown in FIG. 1 , the moving body 30 includes wheels 3 for traveling along the rails 10 and trolleys 4 provided on the wheels 3, and the dampers 42 are It is provided at the same height position as the wheels 3 with respect to the moving body 30 .

According to this configuration, the damper 42 is provided at the same height position as the wheel 3 of the moving body 30, so the center of gravity of the moving body 30 is lowered. As a result, it is possible to stabilize the running of the moving body. For example, the possibility of the moving body 30 overturning, derailing, or falling off is reduced.

In some embodiments, as shown in FIGS. 1, 4, and 5, the damper 42 contacts the object to be avoided (for example, the frame 12) and does not contact the buffer 41 in the moving body 30 at the time of collision. The buffer 41 is provided at a position lower than the buffer 41 as shown in FIG.

According to this configuration, the damper 42 and the shock absorber 41 are configured so as not to contact each other, so that the risk of the traveling of the moving body 30 becoming unstable due to their contact can be reduced.

In some embodiments, damper 42 is configured to have a controllable damping constant, as shown in FIG. With such a configuration, it is possible to change the damping constant of the damper 42 depending on the situation. For example, if more damping is desired, the damping constant can be increased.

In some embodiments, as shown in FIG. 3, the damper 42 increases the damping constant more than normal when an earthquake occurs, based on the earthquake detection signal. According to such a configuration, when an earthquake occurs, the moving speed of the moving body 30 can be damped with a larger damping constant than normal. In addition, since the damping constant is smaller in normal times than when an earthquake occurs, the movable range of the moving body 30 in normal use can be ensured.

In some embodiments, as shown in FIG. 3, the damper 42 includes two fluid-filled interior spaces, at least one orifice 6 communicating between the two interior spaces, and at least one of the orifices 6. and an opening control mechanism 7 configured to change the open state of the one or more orifices. With such a configuration, it is possible to easily control the attenuation constant with a simple configuration.

The present invention is not limited to the above-described embodiments, and includes modifications of the above-described embodiments and modes in which these modes are combined as appropriate.

For example, the crane device 100 is not limited to the configuration shown in FIG. FIG. 6 is a schematic side view of the crane apparatus 100 according to one embodiment of the invention.

In some embodiments, as shown in FIG. 6, the moving body 30 includes wheels 3 for traveling along the rails 10 and hoists 8 provided below the wheels 3, and the dampers 42 are It may be provided at the same height position as the wheels 3 with respect to the moving body 30 .

According to this configuration, the damper 42 is provided at the same height position as the wheel 3 of the moving body 30, so that the moment with the position of the wheel 3 as a fulcrum is less likely to occur, and the traveling of the moving body 30 can be stabilized. can. For example, the possibility of the moving body 30 derailing or falling off is reduced.

In some embodiments, as shown in FIG. 6, the damper 42 is provided in the moving body 30 so as to contact the object to be avoided (for example, the frame 12) and not the damper 41 at the time of collision. The shock absorber 41 is provided at a position higher than 41, and is provided at a position where it contacts the hoist 8 at the time of collision with respect to the object to be avoided.

According to this configuration, the damper 42 and the shock absorber 41 are configured so as not to contact each other, so that the risk of the traveling of the moving body 30 becoming unstable due to their contact can be reduced.

The collision mitigation device 40 for the crane may be configured, for example, to include only the damper 42 (42b) shown in FIG. That is, the collision mitigation device 40 for a crane according to one embodiment is provided on at least one end side of the movable range of the moving body 30 that travels along the rail 10 while supporting the sling 20, or the moving body 30 that travels on the rail 10. A damper 42 (42b) is provided on an object to be avoided (for example, the frame 12) to avoid a collision with the moving body 30 and dampens the moving speed of the moving body 30 toward the object to be avoided. The damper 42 (42b) of the collision mitigation device 40 of the crane has a viscous resistor inside, and increases the damping constant more than usual when an earthquake occurs based on the earthquake detection signal.

According to such a configuration, the damper 42 (42b) normally dampens the moving body 30 with a small damping constant, and dampens the moving body 30 with a large damping constant when an earthquake occurs. Therefore, it is possible to sufficiently attenuate the impact of the moving body 30 even when an earthquake occurs. Moreover, since the damper 42 (42b) normally has a small damping constant, it is possible to suppress a decrease in the movable range due to installation.

1 Piston rod 1a, 1b, 1c Extension part 2 Cylinder tube 3 Wheel 4 Trolley 5 Biasing member 6 Orifice 7 Opening control mechanism 8 Hoist 10 Rail 12 Frame 20 Hanging tool 30 Moving body 40 Collision mitigation device 41 Shock absorber 42 Damper 50 Seismograph 100 Crane device

Claims (11)

Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. a shock absorber for damping the movement speed of the moving body toward the object to be avoided when the moving body reaches an operating position located on the front side in the longitudinal direction of the rail from the object to be avoided;
Provided on the moving body or the object to be avoided, has a viscous resistor inside, and has a speed of movement of the moving body toward the object to be avoided at a position on the front side of the rail in the longitudinal direction from the operating position a damper to start damping;
with
The damper is another damper having the viscous resistor inside the damper,
The damper and the other damper include two internal spaces filled with fluid and at least one orifice communicating with the two internal spaces, wherein the opening area of the orifice, the viscosity of the fluid, and the Attenuation constants differ from each other by at least one of the densities of the fluids being different from each other
collision mitigation device for cranes that Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. a shock absorber for damping the movement speed of the moving body toward the object to be avoided when the moving body reaches an operating position located on the front side in the longitudinal direction of the rail from the object to be avoided;
Provided on the moving body or the object to be avoided, has a viscous resistor inside, and has a speed of movement of the moving body toward the object to be avoided at a position on the front side of the rail in the longitudinal direction from the operating position a damper to start damping;
with
The damper is
provided on the moving body,
a piston rod projecting from the moving body to both sides in the longitudinal direction of the rail;
a biasing member that biases the piston rod toward both sides of the rail in the longitudinal direction so that the piston rod moves toward the origin position;
Crash mitigation device for cranes including . Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. a shock absorber for damping the movement speed of the moving body toward the object to be avoided when the moving body reaches an operating position located on the front side in the longitudinal direction of the rail from the object to be avoided;
Provided on the moving body or the object to be avoided, has a viscous resistor inside, and has a speed of movement of the moving body toward the object to be avoided at a position on the front side of the rail in the longitudinal direction from the operating position a damper to start damping;
with
The moving body is
wheels for traveling along the rail;
a trolley provided on top of the wheel;
including
The damper is provided at the same height position as the wheel with respect to the moving body.
Crash mitigation device for cranes . The damper is provided at a position lower than the damper in the moving body so as to contact the object to be avoided and not the damper in the event of a collision,
4. The collision mitigation device for a crane according to claim 3 , wherein the shock absorber is provided at a position of the object to be avoided, which contacts the trolley in the event of a collision. Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. a shock absorber for damping the movement speed of the moving body toward the object to be avoided when the moving body reaches an operating position located on the front side in the longitudinal direction of the rail from the object to be avoided;
Provided on the moving body or the object to be avoided, has a viscous resistor inside, and has a speed of movement of the moving body toward the object to be avoided at a position on the front side of the rail in the longitudinal direction from the operating position a damper to start damping;
with
The moving body is
wheels for traveling along the rail;
a hoist provided at the bottom of the wheel;
including
A collision mitigation device for a crane, wherein the damper is provided at the same height position as the wheel with respect to the moving body. The damper is provided at a position higher than the damper so as to contact the object to be avoided and not the damper at the time of collision in the moving object,
6. The collision mitigation device for a crane according to claim 5 , wherein the shock absorber is provided in the object to be avoided at a position where it comes into contact with the hoist in the event of a collision. Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. a shock absorber for damping the movement speed of the moving body toward the object to be avoided when the moving body reaches an operating position located on the front side in the longitudinal direction of the rail from the object to be avoided;
Provided on the moving body or the object to be avoided, has a viscous resistor inside, and has a speed of movement of the moving body toward the object to be avoided at a position on the front side of the rail in the longitudinal direction from the operating position a damper to start damping;
with
The damper is configured to be able to control a damping constant
Crash mitigation device for cranes . 8. The collision mitigation device for a crane according to claim 7 , wherein the damper increases the damping constant when an earthquake occurs based on the earthquake detection signal. Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. a shock absorber for damping the movement speed of the moving body toward the object to be avoided when the moving body reaches an operating position located on the front side in the longitudinal direction of the rail from the object to be avoided;
Provided on the moving body or the object to be avoided, has a viscous resistor inside, and has a speed of movement of the moving body toward the object to be avoided at a position on the front side of the rail in the longitudinal direction from the operating position a damper to start damping;
with
The damper is configured to change the opening state of two internal spaces filled with fluid, at least one orifice communicating between the two internal spaces, and one or more of the at least one orifices. an aperture control mechanism ;
Crash mitigation device for cranes . Provided on a moving body that travels along a rail while supporting a sling, or on an object to be avoided that is located at least one end of the movable range of the moving body that runs on the rail and that should avoid collision with the moving body. comprising a damper for damping the moving speed of the moving body toward the object to be avoided;
A collision mitigation device for a crane, wherein the damper has a viscous resistor inside, and increases a damping constant when an earthquake occurs, compared to normal times, based on an earthquake detection signal. a rail;
a hanging tool;
a moving body that travels along the rails while supporting the slings;
A collision mitigation device for a crane according to any one of claims 1 to 10 ;
Crane device with.

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