JP2020132344A - Track travel type crane - Google Patents

Abstract

To provide a track travel type crane that, while maximizing hoisting capability during work, is able to temporarily improve the hoisting capability, and is able to reduce load on an understructure.SOLUTION: A track travel type crane comprises: a travel body 10 freely traveling along a rail 15 and having a wheel base longer than a rail span S; a post 20 extended upward from the travel body 10; a revolving body 30 disposed at an upper end of the post 20 so as to freely revolve; a jib 40 provided on the revolving body 30 so as to be free to rise/lie; and a detachable weight 50 attached to one side of the travel body 10 in a rail span S direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to an orbital traveling crane.

Generally, orbital traveling cranes are installed in docks for building ships.

In the orbital traveling crane, a traveling body is freely arranged along a rail laid on a quay, and a post (columnar structure) as a representative example is erected from the traveling body, and the post is formed. A swivel body is rotatably arranged at the upper end, and a jib is provided on the swivel body so as to be undulating.

For example, Patent Document 1 indicates a general technical level related to the orbital traveling crane.

JP-A-2017-95237

By the way, in a conventional orbital traveling crane, the wheel base (wheel body spacing in the direction parallel to the rail) and the rail span (wheel body spacing in the direction perpendicular to the rail) of the traveling body are different, and the rail span is shorter than the wheel base. Therefore, the rated load was set based on the rail span in consideration of the stability of the track-traveling crane during work.

However, as described above, if the rated load is set based on the rail span, heavier suspended loads can be lifted in a situation where the jib is oriented toward the wheelbase longer than the rail span, that is, toward the traveling direction. In spite of this, the suspension load was restricted, and improvement was desired.

Furthermore, in recent years, from the viewpoint of preventing environmental pollution (energy saving), we would like to temporarily increase the lifting capacity of the orbital crane only when necessary, instead of operating a large-capacity orbital crane that is not always needed. Was also issued. Incidentally, the swivel body of the orbital traveling crane is provided with a counterweight, and it is possible to replace the counterweight with a heavy one corresponding to a large capacity, but in this case, a constant load is applied to the foundation of the quay. It will act and the burden on the foundation will increase. Further, although it is possible to attach a detachable weight to the counterweight only when necessary, since the counterweight is arranged above the mast, it takes time and effort to attach and detach the weight.

The present invention has been made in view of the above-mentioned conventional problems, and is a trajectory capable of temporarily improving the lifting capacity while maximizing the lifting capacity during work and reducing the burden on the foundation. It intends to provide a traveling crane.

The present invention includes a traveling body that can travel along rails and has a wheelbase longer than the rail span.
A columnar structure erected from the traveling body and
A swivel body rotatably arranged at the upper end of the columnar structure,
A jib provided on the swivel body in an undulating manner,
It relates to a track-traveling crane equipped with a removable weight mounted on one side in the rail span direction of the traveling body.

In the orbital traveling crane, a turning angle detector for detecting the turning angle of the jib and a turning angle detector
An undulation angle detector that detects the undulation angle of the jib,
A load detector that detects the load of the suspended load lifted by the jib, and
A controller in which a plurality of rated load curves with respect to the working radius of the jib are set according to the turning angle of the jib is provided.
The rated load curve is set so that the working radius of the jib with respect to the same load gradually increases as the turning angle of the jib approaches from the direction perpendicular to the rail to the direction parallel to the rail. The working radius of the jib on the opposite side of the turning center with respect to the side on which the removable weight is mounted and for the same load in the set turning angle range is larger than the working radius on the side on which the removable weight is mounted. It is preferable that it is set to be.

The track traveling crane is provided with a weight detector that detects that the detachable weight is attached and outputs a signal to the controller.
The controller can select a rated load curve according to the signal detected by the weight detector and the turning angle of the jib detected by the turning angle detector.

In the track traveling type crane, the undulation angle detector uses a signal detected by the weight detector and a rated load curve selected according to the turning angle of the jib detected by the turning angle detector. A swivel limiting mechanism for limiting the swivel of the swivel body by a control signal output from the controller based on the undulation angle of the jib detected in the above and the load of the suspended load detected by the load detector. be able to.

In the track traveling type crane, the undulation angle detector uses a signal detected by the weight detector and a rated load curve selected according to the turning angle of the jib detected by the turning angle detector. Provided with a lodging limiting mechanism that limits the lodging of the jib by a control signal output from the controller based on the undulation angle of the jib detected in the above and the load of the suspended load detected by the load detector. You can also.

In the track traveling type crane, the undulation angle detector uses a signal detected by the weight detector and a rated load curve selected according to the turning angle of the jib detected by the turning angle detector. A ground cutting restriction mechanism that limits the lifting of the suspended load by a control signal output from the controller based on the undulation angle of the jib detected in the above and the load of the suspended load detected by the load detector. You can also prepare.

According to the orbital traveling crane of the present invention, it is possible to temporarily improve the lifting capacity while maximizing the lifting capacity during work, and it is possible to achieve an excellent effect that the burden on the foundation can be reduced. ..

It is a schematic block diagram which shows the Example of the orbital traveling type crane of this invention. FIG. 1 is a view taken along the line II-II of FIG. It is a perspective view which shows the detachable weight in the Example of the orbital traveling type crane of this invention. It is a block diagram which shows the control system in the Example of the orbital traveling type crane of this invention. It is a diagram which shows a plurality of rated load curves in the Example of the orbital traveling crane of this invention. It is a schematic diagram which shows the relationship between the turning angle of the jib and the working radius at the time of lifting the maximum rated load in the Example of the orbital traveling crane of this invention.

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

1 to 6 are examples of the orbital traveling crane of the present invention.

First, the orbital traveling crane in the present embodiment will be described. As shown in FIGS. 1 and 2, the orbital traveling crane includes a traveling body 10, a post 20, a swivel body 30, and a jib 40. There is.

The traveling body 10 is provided with a plurality of equalizer beams 13 whose intermediate portion is supported by rocker pins 12 extending in a horizontal direction perpendicular to the traveling direction on the bottom surface side of the traveling frame 11 in the vertical direction, and the lowermost equalizer beam. 13 has a configuration in which traveling wheels 14 are arranged so as to be rollable along the rail 15. As a result, the traveling body 10 can travel along the rail 15 and the wheelbase W is longer than the rail span S.

The post 20 is a columnar structure having a circular cross section, and is erected from the traveling body 10. The columnar structure erected from the traveling body 10 is not limited to the post 20, and a mast having a truss structure having a rectangular cross section can also be adopted.

The swivel body 30 is rotatably arranged at the upper end of the post 20.

The jib 40 is provided on the swivel body 30 so as to be undulating.

The orbital traveling crane in the present embodiment is characterized by having a detachable weight 50.

The removable weight 50 is mounted on one side of the traveling body 10 in the rail span S direction. More specifically, the detachable weight 50 includes a weight base 51 and a weight body 52 as shown in FIG. The weight base 51 includes a holding frame 51a, a hook 51b, and a reinforcing frame 51c. The holding frame 51a is formed in a shallow box shape with open upper and lower surfaces. The hook 51b is projected from both width ends on the back surface of the holding frame 51a, and a hook groove 51d is formed on the lower surface side thereof. The reinforcing frame 51c is provided with a U-shaped vertical frame 51e hanging from the lower surface on the side where the hook 51b of the holding frame 51a is projected, and a hook 51b of the holding frame 51a. It is composed of a diagonal member 51f that extends diagonally downward from the lower surface on the side opposite to the side and is connected to the lower part of the vertical frame 51e. A support bracket 11b provided with a pin 11c is projected on both side surfaces of the upper beam portion 11a of the traveling frame 11, and a hook 51b of the weight base 51 is hooked on the pin 11c of the support bracket 11b. It is supposed to be. The weight body 52 has a hanging bracket 52a projecting from the upper surface thereof, and stoppers 52b project from the upper ends of both side surfaces, and the stoppers 52b engage with the holding frame 51a of the weight base 51. It has become like. In the example shown in FIG. 3, the weight body 52 is divided into four pieces, for example, the weight of one piece is 20 tons, and the total weight is 80 tons. However, the number of divisions of the weight body 52 is not limited to four, and other number may be selected, or one may be divided without division. Further, the weight of one piece of the weight body 52 is not limited to 20 tons, and can be appropriately changed according to the scale of the orbital traveling crane.

Weight detectors 60 are attached to both side surfaces of the upper beam portion 11a of the traveling frame 11 via a pedestal 11d. The weight detector 60 is, for example, a load cell, and when the hook 51b of the weight base 51 is hooked on the pin 11c of the support bracket 11b and the weight body 52 is suspended on the weight base 51. The lower part of the vertical frame 51e of the weight base 51 is pressed against the weight detector 60.

Further, as shown in FIG. 4, the track traveling type crane in this embodiment includes a turning angle detector 100, an undulation angle detector 200, a load detector 300, and a controller 400.

The turning angle detector 100 is a detector such as an encoder that detects the turning angle of the jib 40, and is attached to a turning drive motor that drives a turning ring (not shown). The gear of the swivel ring may be engaged with a pinion to which the swivel angle detector 100 is attached, and the swivel angle detector 100 may be attached as a separately placed detector.

The undulation angle detector 200 is a detector such as an encoder that detects the undulation angle of the jib 40, and is attached to an undulation drive motor of an undulation rope drive winch (not shown). A pinion to which the undulation angle detector 200 is attached is engaged with a gear provided on the outer circumference of a pin that is the center of undulation of the jib 40, and the undulation angle detector 200 is attached as a separately placed detector. Sometimes.

The load detector 300 is a detector such as a load cell that detects the load of a suspended load lifted by the jib 40, and is hung on a sheave (not shown) provided at the tip of the jib 40 or the sheave. It is attached to the hoisting rope.

As shown in FIG. 5, a plurality of rated load curves with respect to the working radius of the jib 40 are set in the controller 400 according to the turning angle of the jib 40. In the case of this embodiment, the rated load curve shows that the working radius of the jib 40 with respect to the same load is gradually increased as the turning angle of the jib 40 approaches from the direction perpendicular to the rail 15 to the direction parallel to the rail 15. The working radius of the jib 40 is set to be larger, and the working radius of the jib 40 with respect to the same load in the set turning angle range on the opposite side of the turning center with respect to the side on which the removable weight 50 is mounted is the detachable type. It is set to be larger than the working radius on the side where the weight 50 is mounted. This is because the wheelbase W is longer than the rail span S, and the turning angle of the jib 40 approaches from a direction perpendicular to the rail 15 to a direction parallel to the rail 15, the track traveling crane is less likely to tip over and stability. This is because the attachment of the detachable weight 50 makes it easier to balance the work on the opposite side. Incidentally, in the examples shown in FIGS. 5 and 6, the turning angle of the jib 40 is 0 ° and 180 ° in the counterclockwise direction parallel to the rail 15 and 90 ° in the direction perpendicular to the rail 15. When set to 270 °, the working radius capable of lifting 120t, which is the maximum value of the rated load, is set to 30m in the turning work range of 190 ° to 350 °. The working radius that can lift 120t, which is the maximum value of the rated load, is 33m in the turning work range of 30 ° to 150 °, which is the opposite side of the turning center with respect to the side on which the removable weight 50 is mounted. Is set to. Further, in the turning work range of 150 ° to 165 °, the turning work range of 180 ° to 190 °, the turning work range of 350 ° to 0 °, and the turning work range of 15 ° to 30 °, the rated load is The working radius that can lift the maximum value of 120t is set to 37m. Furthermore, in the turning work range of 165 ° to 180 ° and the turning work range of 0 ° to 15 °, the working radius capable of lifting 120t, which is the maximum value of the rated load, is set to 44m. As shown in FIG. 5, each of the rated load curves is set so that the rated load that can be lifted gradually decreases from the maximum value as the working radius increases, and the working radius is 65 m and the rated load is 20 tons. However, the numerical values shown in FIGS. 5 and 6 are merely examples, and it goes without saying that the working radius and the rated load can be appropriately changed according to the size of the orbital traveling crane. Then, the controller 400 is detected by the signal detected by one of the weight detectors 60 provided on both side surfaces of the upper beam portion 11a of the traveling frame 11 and the turning angle detector 100. The rated load curve is selected according to the turning angle of the jib 40.

Further, as shown in FIG. 4, the controller 400 is connected to a turning limiting mechanism 500, a lodging limiting mechanism 600, and a ground cutting limiting mechanism 700.

The controller 400 obtains the working radius of the jib 40 based on the turning angle of the jib 40 detected by the undulation angle detector 200.

The turning limiting mechanism 500 uses a rated load curve selected according to the signal detected by the weight detector 60 and the turning angle of the jib 40 detected by the turning angle detector 100, and the undulation angle. The swivel body 30 is swiveled by a control signal output from the controller 400 based on the undulation angle of the jib 40 detected by the detector 200 and the load of the suspended load detected by the load detector 300. It is designed to be restricted.

The lodging limiting mechanism 600 uses a rated load curve selected according to the signal detected by the weight detector 60 and the turning angle of the jib 40 detected by the turning angle detector 100, and the undulation angle. The lodging of the jib 40 is restricted by a control signal output from the controller 400 based on the undulation angle of the jib 40 detected by the detector 200 and the load of the suspended load detected by the load detector 300. It is designed to do.

The ground cutting limiting mechanism 700 uses a rated load curve selected according to the signal detected by the weight detector 60 and the turning angle of the jib 40 detected by the turning angle detector 100, and the undulations. The lift of the suspended load is lifted by a control signal output from the controller 400 based on the undulation angle of the jib 40 detected by the angle detector 200 and the load of the suspended load detected by the load detector 300. It is designed to be restricted.

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

When operating the orbital traveling crane, the hook 51b of the weight base 51 is hooked on the pin 11c of the support bracket 11b provided on one side of the traveling body 10 in the rail span S direction, and the weight is used. By suspending the weight body 52 from the base 51, the removable weight 50 is attached.

When the lower part of the vertical frame 51e of the weight base 51 is pressed against the weight detector 60 and the detection value of the weight detector 60 reaches a specified value, the weight detector 60 indicates that the removable weight 50 is attached. The detected signal is detected by the controller 400. At the same time, the turning angle detector 100 detects the turning angle of the jib 40, the undulation angle detector 200 detects the undulating angle of the jib 40, and the load detector 300 detects the load of the suspended load lifted by the jib 40. Then, each detected value is input to the controller 400.

In the controller 400, the rated load curve is selected according to the signal detected by the weight detector 60 and the turning angle of the jib 40 detected by the turning angle detector 100.

When the turning angle of the jib 40 is in the range of 30 ° to 150 ° on the opposite side of the removable weight 50, for example, in FIG. 6, the rated load curve shown by the broken line in FIG. Is selected, and the working radius that can lift 120t, which is the maximum value of the rated load, is 33m. Then, in the rated load curve shown by the broken line in FIG. 5, for example, when the working radius is 45 m, the rated load is about 70 t. That is, when a 70t suspended load is lifted by the jib 40 and the working radius is about to exceed 45 m, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 A control signal is output from the controller 400 to the lodging limiting mechanism 600 based on the load of the suspended load detected in the above, and the lodging limiting mechanism 600 limits the lodging of the jib 40. Further, when a suspended load exceeding 70 tons is to be lifted by the jib 40 from a position where the working radius is 45 m, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 detect it. A control signal is output from the controller 400 to the ground cutting limiting mechanism 700 based on the load of the suspended load, and the lifting of the suspended load is restricted by the ground cutting limiting mechanism 700.

Incidentally, when the turning angle of the jib 40 is in the range of 190 ° to 350 ° on the same side as, for example, the detachable weight 50 is mounted in FIG. 6, the rated load shown by the solid line in FIG. 5 is shown. A curve is selected, and the working radius that can lift 120t, which is the maximum value of the rated load, is 30m. Then, in the rated load curve shown by the solid line in FIG. 5, for example, when the working radius is 45 m, the rated load is about 60 tons. That is, when the working radius is about to exceed 45 m while the suspended load of 60 tons is being lifted by the jib 40, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 A control signal is output from the controller 400 to the lodging limiting mechanism 600 based on the load of the suspended load detected in the above, and the lodging limiting mechanism 600 limits the lodging of the jib 40. Further, when a suspended load exceeding 60 tons is about to be lifted by the jib 40 from a position where the working radius is 45 m, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 detect it. A control signal is output from the controller 400 to the ground cutting limiting mechanism 700 based on the load of the suspended load, and the lifting of the suspended load is restricted by the ground cutting limiting mechanism 700.

Further, in FIG. 6, the turning angle of the jib 40 is, for example, in the range of 150 ° to 165 °, the range of 180 ° to 190 °, the range of 350 ° to 0 °, or the range of 15 ° to 30 °. In this case, the rated load curve shown by the alternate long and short dash line in FIG. 5 is selected, and the working radius at which 120 t, which is the maximum value of the rated load, can be lifted is 37 m. Then, in the rated load curve shown by the alternate long and short dash line in FIG. 5, for example, when the working radius is 45 m, the rated load is about 80 tons. That is, when the working radius exceeds 45 m while the suspended load of 80 tons is being lifted by the jib 40, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 A control signal is output from the controller 400 to the lodging limiting mechanism 600 based on the load of the suspended load detected in the above, and the lodging limiting mechanism 600 limits the lodging of the jib 40. Further, when a suspended load exceeding 80 tons is about to be lifted by the jib 40 from a position where the working radius is 45 m, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 detect it. A control signal is output from the controller 400 to the ground cutting limiting mechanism 700 based on the load of the suspended load, and the lifting of the suspended load is restricted by the ground cutting limiting mechanism 700.

Furthermore, when the turning angle of the jib 40 is in the range of, for example, 165 ° to 180 ° or 0 ° to 15 ° in FIG. 6, the rated load curve shown by the alternate long and short dash line in FIG. 5 is selected. The working radius that can lift 120t, which is the maximum value of the rated load, is 44m. Then, in the rated load curve shown by the alternate long and short dash line in FIG. 5, for example, when the working radius is 45 m, the rated load is about 110 t. That is, when the working radius exceeds 45 m while the 110t suspended load is being lifted by the jib 40, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 A control signal is output from the controller 400 to the lodging limiting mechanism 600 based on the load of the suspended load detected in the above, and the lodging limiting mechanism 600 limits the lodging of the jib 40. Further, when a suspended load exceeding 110 tons is about to be lifted by the jib 40 from a position where the working radius is 45 m, the undulation angle of the jib 40 detected by the undulation angle detector 200 and the load detector 300 detect it. A control signal is output from the controller 400 to the ground cutting limiting mechanism 700 based on the load of the suspended load, and the lifting of the suspended load is restricted by the ground cutting limiting mechanism 700.

On the other hand, in FIG. 6, the turning angle of the jib 40 is, for example, in the range of 165 ° to 180 ° or 0 ° to 15 °, and the rated load curve shown by the alternate long and short dash line in FIG. 5 is selected. At that time, it is assumed that the working radius is 45 m and the suspended load of 110 tons is lifted by the jib 40. From this state, when the turning angle of the jib 40 tries to deviate from, for example, the range of 165 ° to 180 ° or the range of 0 ° to 15 ° in FIG. 6, it is detected by the undulation angle detector 200. A control signal is output from the controller 400 to the turning limiting mechanism 500 based on the undulation angle of the jib 40 and the load of the suspended load detected by the load detector 300, and the turning limiting mechanism 500 outputs the control signal to the turning limiting mechanism 500. The turning of is restricted.

Further, in FIG. 6, the turning angle of the jib 40 is, for example, in the range of 150 ° to 165 °, the range of 180 ° to 190 °, the range of 350 ° to 0 °, or the range of 15 ° to 30 °. It is assumed that when the rated load curve shown by the alternate long and short dash line in FIG. 5 is selected, the working radius is 45 m and an 80 ton suspended load is suspended by the jib 40. From this state, when the turning angle of the jib 40 is about to shift to, for example, a range of 30 ° to 150 ° or a range of 190 ° to 350 ° in FIG. 6, it is detected by the undulation angle detector 200. A control signal is output from the controller 400 to the turning limiting mechanism 500 based on the undulation angle of the jib 40 and the load of the suspended load detected by the load detector 300, and the turning limiting mechanism 500 outputs the control signal to the turning limiting mechanism 500. The turning of is restricted.

As a result, in the case of this embodiment, unlike the conventional orbital traveling crane in which the rated load is set based on the rail span S, the wheelbase W is longer than the rail span S, that is, closer to the traveling direction. In situations where the jib 40 is facing, heavier loads can be lifted.

Further, in the case of this embodiment, unlike replacing the counterweight with a heavy one corresponding to a large capacity, the detachable weight 50 is attached to the traveling body 10 only when necessary, thereby burdening the foundation of the quay. It is possible to reduce it.

Further, in the case of this embodiment, since the traveling body 10 is arranged near the ground, the removable weight 50 can be easily and quickly attached and detached, which is useful for improving work efficiency.

In this way, it is possible to temporarily improve the lifting capacity while maximizing the lifting capacity during work, and it is possible to reduce the burden on the foundation.

Then, in the case of this embodiment, the swivel angle detector 100 that detects the swivel angle of the jib 40, the undulation angle detector 200 that detects the undulation angle of the jib 40, and the load of the suspended load lifted by the jib 40 are applied. A load detector 300 to be detected and a controller 400 in which a plurality of rated load curves with respect to the working radius of the jib 40 are set according to the turning angle of the jib 40 are provided, and the rated load curve is the turning angle of the jib 40. Is set so that the working radius of the jib 40 with respect to the same load gradually increases as the angle approaches from the direction perpendicular to the rail 15 to the direction parallel to the rail 15, and the removable weight 50 is attached. The working radius of the jib 40 is set to be larger than the working radius of the side on which the detachable weight 50 is mounted, on the opposite side of the turning center with respect to the turning side and for the same load in the set turning angle range. There is. With this configuration, the set rated load curve can be selected according to the situation and the work can be performed stably.

Further, in the case of this embodiment, the weight detector 60 that detects that the detachable weight 50 is attached and outputs a signal to the controller 400 is provided, and the controller 400 is the weight detector 60. The rated load curve is selected according to the detected signal and the turning angle of the jib 40 detected by the turning angle detector 100. With this configuration, the rated load curve can be selected more accurately.

Moreover, in the case of this embodiment, the undulations are used by using the rated load curve selected according to the signal detected by the weight detector 60 and the turning angle of the jib 40 detected by the turning angle detector 100. The swivel body 30 is swiveled by a control signal output from the controller 400 based on the undulation angle of the jib 40 detected by the angle detector 200 and the load of the suspended load detected by the load detector 300. The turning limiting mechanism 500 is provided. With this configuration, even if the jib 40 tries to turn in a direction exceeding the rated load, its movement is restricted, which is effective in improving the stability of the orbital traveling crane during work.

Further, in the case of this embodiment, the undulations are used by using the rated load curve selected according to the signal detected by the weight detector 60 and the turning angle of the jib 40 detected by the turning angle detector 100. The foresail of the jib 40 is tilted by a control signal output from the controller 400 based on the undulation angle of the jib 40 detected by the angle detector 200 and the load of the suspended load detected by the load detector 300. The lodging limiting mechanism 600 for limiting is provided. With this configuration, even if the jib 40 tries to fall down to the extent that the working radius becomes large and exceeds the rated load, its movement is restricted, so that the stability of the orbital traveling crane during work is improved. Valid on.

Furthermore, in the case of this embodiment, the rated load curve selected according to the signal detected by the weight detector 60 and the turning angle of the jib 40 detected by the turning angle detector 100 is used. Lifting of the suspended load by a control signal output from the controller 400 based on the undulating angle of the jib 40 detected by the undulation angle detector 200 and the load of the suspended load detected by the load detector 300. The ground cutting restriction mechanism 700 is provided. With this configuration, even if an attempt is made to lift a suspended load that exceeds the rated load, the movement is restricted, which is effective in improving the stability of the orbital traveling crane during work.

The orbital traveling crane of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

10 Traveling body 11 Traveling frame 11a Upper beam part 11b Support bracket 11c pin 11d Pedestal 12 Rocker pin 13 Equalizer beam 14 Traveling wheel 15 Rail 20 Post (columnar structure)
30 Swivel body 40 Jib 50 Detachable weight 51 Weight stand 51a Holding frame 51b Hook hook 51c Reinforcing frame 51d Hook groove 51e Vertical frame 51f Slanted material 52 Weight body 52a Suspension bracket 52b Stopper 60 Weight detector 100 Swivel angle Detector 200 Undulating angle detector 300 Load detector 400 Controller 500 Swing limiting mechanism 600 Tilt limiting mechanism 700 Ground cutting limiting mechanism S Railspan W Wheelbase

Claims (6)

A traveling body that can travel along the rail and has a wheelbase longer than the rail span.
A columnar structure erected from the traveling body and
A swivel body rotatably arranged at the upper end of the columnar structure,
A jib provided on the swivel body in an undulating manner,
An orbital traveling crane equipped with a removable weight mounted on one side in the rail span direction of the traveling body. A swivel angle detector that detects the swivel angle of the jib,
An undulation angle detector that detects the undulation angle of the jib,
A load detector that detects the load of the suspended load lifted by the jib, and
A controller in which a plurality of rated load curves with respect to the working radius of the jib are set according to the turning angle of the jib is provided.
The rated load curve is set so that the working radius of the jib with respect to the same load gradually increases as the turning angle of the jib approaches from the direction perpendicular to the rail to the direction parallel to the rail. The working radius of the jib on the opposite side of the turning center with respect to the side on which the removable weight is mounted and for the same load in the set turning angle range is larger than the working radius on the side on which the removable weight is mounted. The track traveling crane according to claim 1, which is set to be. A weight detector that detects that the detachable weight is attached and outputs a signal to the controller is provided.
The track traveling crane according to claim 2, wherein the controller selects a rated load curve according to a signal detected by the weight detector and a turning angle of a jib detected by the turning angle detector. Using the rated load curve selected according to the signal detected by the weight detector and the turning angle of the jib detected by the turning angle detector, the undulation angle of the jib detected by the undulation angle detector is used. The track traveling according to claim 3, further comprising a turning limiting mechanism for limiting the turning of the swinging body by a control signal output from the controller based on the load of the suspended load detected by the load detector. Type crane. Using the rated load curve selected according to the signal detected by the weight detector and the turning angle of the jib detected by the turning angle detector, the undulation angle of the jib detected by the undulation angle detector is used. The track according to claim 3 or 4, further comprising a lodging limiting mechanism for limiting the lodging of the jib by a control signal output from the controller based on the load of the suspended load detected by the load detector. Traveling crane. Using the rated load curve selected according to the signal detected by the weight detector and the turning angle of the jib detected by the turning angle detector, the undulation angle of the jib detected by the undulation angle detector is used. 3 to 5 of claims 3 to 5, further comprising a ground cutting limiting mechanism for limiting the lifting of the suspended load by a control signal output from the controller based on the load of the suspended load detected by the load detector. The track-traveling crane according to any one of the items.

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