JP5319147B2 - Crane power feeding system and method - Google Patents

Description

  The present invention relates to a crane power feeding technique, and more particularly to a crane power feeding technique for supplying power from a power feeding rail to a crane apparatus.

  A method of supplying power via a trolley wire installed along a lane as a power supply system that supplies power to a crane device such as a gate-type transfer crane device that loads and unloads a container with respect to a trailer in a container terminal (See, for example, Patent Document 1). In such a crane apparatus, when a moving body such as a person or a vehicle other than the crane apparatus enters the lane, it is necessary to prevent an electric shock to the trolley wire. For this reason, when the structure which insulates an overhead wire along a lane is installed, it becomes impossible for a mobile body to move freely across a lane.

In particular, in the case of a transfer crane device, a trolley wire is installed along a lane having an extremely long distance provided in a container terminal, and a structure such as a passage for insulating the trolley wire is continuously provided along the trolley wire. It is necessary to install. For this reason, the container worker and the trailer for transporting the container cannot cross the lane and need to make a detour to the end of the lane.
Further, in the case of a tire type transfer crane device, since the straight traveling accuracy is not so high, the current collecting structure for maintaining the power supply from the trolley wire becomes complicated.

JP 2003-137494 A

In such a power supply system, a method using a power supply rail instead of the trolley wire can be considered. If this power supply rail is provided on the ground, it is possible for a person to straddle and cross it, and if it is provided at almost the same height as the ground, it is possible for a vehicle or device to move freely across the road. . Moreover, even if the traveling device has a low straight traveling accuracy such as a crane device, the power supply can be easily maintained by giving the cart that collects power by traveling on the power supply rail.
However, when the power supply rail is used, the contact portion between the power supply rail and the carriage cannot be insulated, and there is a problem that an electric shock may occur when a moving body passes on the power supply rail.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a crane power supply system and method that can prevent electric shock from a power supply rail provided on the ground.

In order to achieve such an object, a crane power feeding system according to the present invention includes a crane device that operates by a power source supplied from the outside, and a feeding rail that is provided along a lane in which the crane device travels. A power supply unit that supplies power to the power supply rail, and a current collector that collects power supplied from the power supply unit by electrically contacting the power supply rail to the crane device; and a power supply rail A part of the power supply rail including the current collection point where the current collector and the current collector are in electrical contact is covered as a protective section from above, so that an electric shock protection unit is provided to protect the electric shock on the power supply rail in the protective section. The rail is composed of a plurality of rows of partial rails that are electrically insulated from each other, and the rail length of the partial rail is equal to or less than the protection distance from the end point of the protection section to the current collecting point, The power supply power is supplied to only the partial rail that is in electrical contact with the current collector among the partial rails, and the power supply rail is the partial rail only in the section where any moving body enters the lane. Consisting of

At this time, the power supply unit is provided with a detector that detects electrical contact between the partial rail and the current collector based on an electrical signal obtained from the partial rail, and a corresponding partial rail based on the detection output of the detector. A switch for switching supply / stop of the power supply to the power supply may be provided.
Further, the crane device may output an electric signal to the partial rail with which the current collector is in electrical contact.

  Further, as current collection, the electric shock protection unit is rotatably supported and rolls on the power supply rail, and collects power from the power supply rail using the physical contact point with the power supply rail as a current collection point. Wheels may be used.

  Further, the current collector may be provided in an intermediate portion of the protection section, and the electric shock protection section may rotatably support a wheel that rolls on the power supply rail between the current collection point and the end point of the protection section.

The crane power supply method according to the present invention includes a crane device that operates with power supply supplied from the outside, a power supply rail provided along a lane in which the crane device travels, and a power supply for the power supply rail. A crane power supply method used in a crane power supply system including a power supply unit that supplies electric power, wherein the power supply supplied from the power supply unit by electrically contacting the power supply rail via a current collector is collected by a crane device. The power supply rail in the protection section is covered by covering the part of the power supply rail including the current collection point where the power supply rail and the current collector are in electrical contact with each other as a protection section from above by the step of collecting power and the crane device. Have a rail length that is less than the protection distance from the end point of the protection section to the current collection point and are electrically insulated from each other. Te among the plurality of partial rails constituting the power supply rail by being conditions set, and a step of supplying source power from the power supply unit only to the part rails in contact condenser electronically and electrically, the electric power supply rails Consists of a row of partial rails only in a section of a lane where an arbitrary moving body enters.

According to the present invention, all the partial rails that are in electrical contact with the current collector can be covered with the cover. For this reason, the partial rail that is being fed is not exposed from the cover, and it is possible to suppress electric shock to the partial rail that is being fed.
Therefore, any moving body such as a person, a vehicle, or a device can safely cross the power supply rail provided in the lane where the crane device travels, and a complicated configuration is used. It is possible to provide a ground power supply method.

Next, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
First, a crane power feeding system according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is an explanatory diagram of a crane power feeding system according to a first embodiment of the present invention.

  This crane power supply system is a power supply system based on a ground power supply system that supplies power to the crane device 6 from the ground, and mainly includes the crane device 6, the power supply rail 1, and the power supply unit 2.

The power feeding unit 2 is a facility device that is installed outside the crane device 6 such as on the ground or underground and supplies power power 25 of the crane device 6.
The crane device 6 is a vehicle device that collects power supply power 25 via the current collector 4 and travels on a lane based on the power supply power 25 to perform cargo handling at an arbitrary position.
The power supply rail 1 is provided on the ground G along the lane of the crane device 6 and electrically contacts the current collector 4 of the crane device 6 at the current collection point P, thereby supplying power to the crane device 6. It is a rail.

  In the present embodiment, the crane device 6 is covered (protected) from a part of the power supply rail 1 including the current collection point P as a protection section S from above, thereby protecting (preventing) electric shock on the power supply rail 1 in the protection section S. The cover 3 (electric shock protection portion) is provided, and the power supply rail 1 is constituted by a row of a plurality of partial rails 11 that are electrically insulated from each other. The rail length L of the partial rail 11 is defined as an end point of the protection section S. The power source 25 is supplied only to the partial rail 11 that is in electrical contact with the current collector 4 among the partial rails 11 by the power feeding unit 2 with a length equal to or shorter than the protective distance W from E to the current collecting point P. It is what I did.

[Crane supply system]
Next, with reference to FIG. 1, the crane electric power feeding system concerning the 1st Embodiment of this invention is demonstrated in detail.
The crane device 6 is a crane device such as a gate-type transfer crane device that loads and unloads a container on a trailer in a container terminal.

In the crane device 6 according to the present embodiment, for example, power supply power 25 for traveling along a lane provided in a container terminal and performing cargo handling at an arbitrary position is supplied from a power supply rail 1 provided on the ground. A current collector 4 for collecting current is provided.
Further, the crane device 6 includes a protection section S that covers a part of the power supply rail 1 including the current collection point P where the power supply rail 1 and the current collector 4 are in electrical contact with each other. A cover 3 for protecting the electric shock on the power supply rail 1 in the section S is provided.

  At this time, the positional relationship between the end point of the protection section S and the current collecting point P is fixed, and the protection section S moves on the power supply rail 1 according to the traveling of the crane device 6. In the present embodiment, a case in which all of the protection section S is formed by the cover 3 will be described as an example. However, part or all of other parts such as a vehicle body and a tire covering the power supply rail 1 in the crane device 6. The protection section S may be formed by using both of them, or a plurality of these parts may be combined to form the protection section S.

The power supply rail 1 is provided along the lane in which the crane device 6 travels, and feeds the power source 25 to the crane device 6 by making electrical contact with the current collector 4 of the crane device 6 at the current collection point P. It is a rail.
The power supply rail 1 is composed of a row of a plurality of partial rails 11 that are electrically insulated from each other. The partial rail 11 has a rail length L equal to or less than a protection distance W from the end point E of the protection section S to the current collection point P. have.

The power feeding unit 2 is a facility device installed on the ground including the underground, and includes a power supply device 21 and a switching unit 22.
The power supply device 21 has a function of converting power generated by the power generation facility into a predetermined voltage and supplying power power 25 of the crane device 6. Examples of the power source 25 for the crane device 6 include a DC power source, an AC power source, and a three-phase AC power source.

The switching unit 22 includes a switching device 23 provided between the power supply device 21 and each partial rail 11. The switching device 23 has a function of switching and supplying the power supply 25 to the partial rail 11 only during a period when the electrical contact of the current collector 4 of the crane device 6 with respect to the corresponding partial rail 11 is detected. Yes.
Accordingly, the power supply unit 2 supplies the power supply power 25 only to the partial rail 11 that is in electrical contact with the current collector 4 of the crane device 6 in the power supply rail 1.

At this time, as described above, the rail length L of the partial rail 11 is limited to the protection distance W from the end point E of the protection section S to the current collection point P or less. For this reason, even when one end of the partial rail 11 is in electrical contact with the current collector 4 and the power supply power 25 is supplied to the partial rail 11, the section where there is a possibility of electric shock with respect to the partial rail 11 is not collected. The section is from the electrical point P to the rail length L.
On the other hand, the cover 3 of the crane device 6 is always protected against electric shock for the power supply rail 1 in the protection section S at the protection distance W from the current collection point P. Accordingly, in the power supply rail 1, the electric shock is always protected by the cover 3 for the partial rail 11 to which the power supply power 25 is supplied via the switching device 23.

[Crane equipment]
Next, with reference to FIG. 2 and FIG. 3, the structural example of the crane apparatus 6 to which the crane electric power feeding system concerning this invention is applied is demonstrated in detail. FIG. 2 is a side view showing the configuration of the crane apparatus. FIG. 3 is a front view showing the configuration of the crane apparatus.

The crane apparatus 6 is composed of a gantry 60 composed of a portal frame as a whole. The gantry 60 includes an upper beam 6A, leg portions 6B that support both ends of the beam 6A, and a base 6C that supports the leg portions 6B. A tire 6E is provided below the base 6C via a carriage 6D. The tire 6E is supported by the carriage 6D so that the traveling direction can be freely changed to a forward direction X along the lane or a perpendicular direction Y orthogonal to the lane.
Further, an upper portion of the base 6C sandwiched between the leg portions 6B is in contact with a power supply device or a power storage device that supplies power to each unit with the power source collected by the current collector 4, and further to the current collector 4. A device unit 6G that houses an electrical device such as a signal output device that outputs a power supply request signal 24 to the partial rail is provided.

  A trolley 6H is provided on the beam 6A at the upper portion of the gantry 60, and the trolley 6H travels on the rail of the beam 6A in the right-angle direction Y by driving the traverse motor 6L mounted on the trolley 6H. . Further, a spreader 6I for suspending the upper portion of the container 9 is suspended from the trolley 6H via a cable 6J. The main winding motor 6M placed on the trolley 6H is driven to drive the cable 6J. By performing the winding up and down, the spreader 6I moves up and down. In addition, the trolley 6H is provided with electrical equipment such as a command room 6K on which an operator is boarded and a controller.

  The cover 3 is an outer lower portion of the base 6C, and is attached between the two carriages 6D at a position facing the power supply rail 1 on the ground G via the support member 5 and the arm 5A. By covering a partial section of the power supply rail 1 including from above, electric shock in the section is protected. The current collector 4 attached to the cover 3 is always in electrical contact with the power supply rail 1 by traveling or sliding on the power supply rail 1 even when the crane device 6 is traveling. Power supply power from the power supply device 21 collected by the current collector 4 is input to the crane device 6.

[Container Terminal]
Next, with reference to FIG. 4, the container terminal in which the crane electric power feeding system concerning this Embodiment is used is demonstrated. FIG. 4 is a plan view showing a configuration example of the container terminal.
The container terminal 70 is provided facing the port wharf 7A, and the container 9 is loaded and unloaded from the ship 7B by a container crane 7C disposed on the wharf 7A.

The container terminal 70 is provided with a plurality of lanes 71 each having a rectangular area extending along the longitudinal direction of the container 9, that is, the forward direction X. The crane device 6 travels in the forward direction X in the lane 71. The containers 9 placed in the lane 71 are sorted efficiently.
The container terminal 70 is provided with a gate 73 on the road 72 side, and the trailer 91 passes through the gate 73 to carry in / out the container 9 and transport the container 9 to other locations in the container terminal 70. I do.

The lane 71 is provided with a passage for the trailer 91, and the container 9 is loaded and unloaded by the crane device 6 on the trailer 91 stopped in this passage.
In each lane 71, for example, the power supply device 21 of the crane power feeding system is arranged on the ground or underground at the end of the lane 71, and the power feeding rail 1 extends along the forward direction X at the side end of the lane 71. It is installed. The crane apparatus 6 is supplied with power from a power supply device 21 via a current collector 4 that is in electrical contact with the power supply rail 1.

  At this time, power is supplied only to the partial rails 11 that are in electrical contact with the current collector of the power supply rail 1 and is not supplied to the other partial rails 11, so there is no danger of electric shock. In addition, each partial rail 11 has a rail length L that is equal to or shorter than the protection distance W from the end point E of the protection section S to the current collection point P by the current collector 4. For this reason, the supplied partial rail 11 is completely protected from electric shock by the cover 3, and there is no risk of electric shock.

[Power supply rail]
Next, the power supply rail of the crane power supply system according to the first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 5 is a plan view showing a main part of the power supply rail. FIG. 6 is a front view showing a main part of the power supply rail. FIG. 7 is a cross-sectional view showing the main part of the power supply rail.

  The power supply rail 1 is composed of two power supply rails 1A and 1B provided in parallel in a groove 12 formed on the ground G. These power supply rails 1A and 1B are composed of a row of a plurality of partial rails 11A and 11B that are electrically insulated from each other. These partial rails 11A and 11B only have to have a rail length L that is equal to or less than the protection distance W from the end point E of the protection section S to the current collecting point P, and all of these partial rails need to have the same rail length L. There is no. As for the insulating portion 13, a general insulator such as resin may be used, and a space provided between adjacent partial rails may be used as the insulator. A DC power supply or an AC power supply is supplied from the power supply device 21 through the two supply rails 1A and 1B.

The cover 3 of the crane device 6 is composed of a box-shaped main body 3A having an opening at the bottom facing the power supply rail 1, and covers a part of the power supply rail 1 including the current collection point P from above by covering the section 3A. Has a function to protect against electric shock.
The main body 3A may be made of a member that can prevent an electric shock of an operator, and may be a plate-like member or a plate-like member having a vent hole. Or you may comprise 3 A of main bodies with a cage | basket body or a frame body using the combination of a net-like member or a rod-shaped member.

The current collectors 4A and 4B are wheels that are rotatably supported in the inner chamber of the cover 3 via the axle 4X, and are electrically connected to the power supply rails 1A and 1B by rolling on the power supply rails 1A and 1B. The power supply power 25 is collected from the power supply rails 1A and 1B.
The current collectors 4A and 4B have a partial rail 11A in which the protection distance W between the current collection point P in contact with the power supply rails 1A and 1B and the end point E of the protection section S of the cover 3 constitutes the power supply rails 1A and 1B. , 11B is supported at a position that is longer than the rail length L.

  One end of the arm 5A is rotatably attached to the end of the support member 5, and the other end is rotatably attached to the upper portion of the main body 3A. One end of the hydraulic cylinder 5B is rotatably attached to the side portion of the support member 5, and the other end is rotatably attached to the middle of the arm 5A.

  At this time, during normal traveling of the crane device 6, a hydraulic circuit (not shown) is controlled so that, for example, hydraulic oil on the rod side and the head side of the hydraulic cylinder 5B is communicated via a reservoir tank (not shown). As a result, the arm 5 </ b> A is brought into a state in which the arm 5 </ b> A can freely rotate up and down around the support member 5. As a result, the cover 3 is lowered by its own weight, and the current collector 4 of the cover 3 comes into electrical contact with the power supply rail 1 on the ground G. Accordingly, since the vertical movement of the crane device 6 is not transmitted to the cover 3, the current collector 4 can smoothly run or slide on the power supply rail 1 even when the ground G undulates or the crane device 6 shakes. it can.

  During maintenance, a hydraulic circuit (not shown) is controlled to supply hydraulic oil from an oil pump (not shown) to the rod side of the hydraulic cylinder 5B, for example, and the head side hydraulic oil is returned to the reservoir tank. The cover 3 may be lifted from the ground G by lifting the arm 5A.

  During normal travel, the cover 3 may be pressed against the ground G via the arm 5A by increasing the internal pressure of the hydraulic cylinder 5B to some extent. At this time, the upper limit of the internal pressure of the hydraulic cylinder 5B may be adjusted by the relief valve of the hydraulic cylinder 5B so that a predetermined pressure or more is not applied to the cover 3. Thereby, it is possible to improve current collection efficiency.

[Switching device]
Next, with reference to FIG. 8, the switch of the crane electric power feeding system concerning this Embodiment is demonstrated in detail. FIG. 8 is a block diagram showing the configuration of the switch.
The partial rail 11 constituting the power supply rail 1 is provided with a switching device 23 for controlling the supply of power from the power supply device 21 to each partial rail 11.
The switching device 23 is provided with a detector 23A and a switch 23B as main functional units.

  The detector 23A includes a dedicated circuit unit such as a signal detection circuit, and has a function of detecting and outputting the presence / absence of a power supply request signal 24 output from the crane device 6 via the partial rail 11. For example, if the power supply request signal 24 is always output from the power supply unit (not shown) of the crane device 6 via the current collector 4, only the partial rail 11 in electrical contact with the current collector 4 is automatically Therefore, the power supply request signal 24 is output. When a high-frequency signal having a predetermined frequency is used as the power supply request signal 24, the power supply request signal 24 output to the partial rail 11 from the crane device 6 can be obtained by providing a filter circuit for selecting the frequency signal component in the signal detection unit 23A. It can be detected.

  The switch 23B is composed of a dedicated circuit unit such as a relay circuit, and based on a detection output indicating whether or not the power supply request signal 24 is detected from the detector 23A, the power supply from the power supply device 21 to the corresponding partial rail 11 is provided. It has a function of supplying power 25 by switching. Thereby, only when the power supply request signal 24 is detected by the detector 23A, the power supply power 25 is supplied to the partial rail 11 based on the detection output, and the power supply request signal 24 is not detected by the detector 23A. The supply of the power supply 25 to the partial rail 11 is stopped based on the detection output.

  If the switching device 23 is disposed in the vicinity of the partial rail 11, the length of the wiring cable connecting the switching device 23 and the partial rail 11 can be shortened. Further, by routing the wiring cable from the power supply device 21 along the power supply rail 1 and branching the wiring cable to connect to each switching device 23, or by connecting the wiring cable by each switching device 23, Power supply power can be supplied from the power supply device 21 to each switching device 23. Therefore, the length of the wiring connecting the power supply device 21 and each switching device 23 can be shortened, and the wiring work burden can be greatly reduced.

[Operation of crane power supply system]
Next, with reference to FIGS. 9-11, operation | movement of the crane electric power feeding system concerning the 1st Embodiment of this invention is demonstrated. FIG. 9 is an explanatory diagram illustrating the relationship between the current collectors and the partial rails of the crane power feeding system according to the first embodiment of the present invention. FIG. 10 is an explanatory diagram illustrating an example of a power feeding operation of the crane power feeding system according to the first embodiment of the present invention. FIG. 11 is an explanatory diagram illustrating another power feeding operation of the crane power feeding system according to the first embodiment of the present invention.

  FIG. 9 shows an example in which two current collectors 41 and 42 are provided on the cover 3. The positions of the current collectors 41, 42, that is, the current collecting point P are separated from the end point E of the protection section S by the protection distance W. At this time, the rail length L of the partial rails 11X, 11Y, and 11Z is equal to or less than the protection distance W. Hereinafter, a case where the distance between the two current collectors 41 and 42 is shorter than the rail length L will be described as an example.

When the cover 3 moves in the X direction on the power supply rail 1 and enters the partial rail 11X, the current collector 41 is in electrical contact with the partial rail 11X for the first time at time T1, and the partial current from the partial rail 11X at time T3. It moves to the rail 11Y, moves from the partial rail 11Y to the partial rail 11Z at time T5, and leaves the partial rail 11Z at time T7.
Similarly, the current collector 42 is in electrical contact with the partial rail 11X for the first time at time T2, moves from the partial rail 11X to the partial rail 11Y at time T4, and moves from the partial rail 11Y to the partial rail 11Z at time T6. It leaves | separates from the partial rail 11Z at the time T8. At this time, the time difference between the current collectors 41 and 42 is determined by the moving speed of the current collectors 41 and 42 and the distance between the current collectors 41 and 42.

On the other hand, with the movement of the current collectors 41 and 42, power is supplied to the partial rail 11X only during the period from time T1 to time T4, and power is supplied to the partial rail 11Y only during the period from time T3 to time T6. Thus, power is supplied to the partial rail 11Z only during the period from time T5 to time T8.
At this time, in the partial rails 111X, 11Y, and 11Z, there is a possibility of electric shock as the timing when the current collector 41 first contacts with these partial rails and from the partial rail with which the current collector 42 has been in contact so far. The time to leave is given.

The current collector 41 is initially in contact with the partial rails 11X, 11Y, and 11Z at times T1, T3, and T5, respectively. The rail length L of these partial rails varies from the current collection point P to the end point E of the protection section S. Or less than the protection distance W. For this reason, at time T1, T3, T5, when the current collector 41 first contacts one end of the partial rail, the other end of the partial rail is already hidden under the cover 3.
Similarly, the current collector 42 is detached from the partial rails 11X, 11Y, and 11Z at times T4, T6, and T8, respectively. The rail length L of these partial rails is the end point of the protection section S from the current collection point P. Less than or equal to the protection distance W to E. Therefore, at time T4, T6, T8, when the current collector 42 is detached from one end of the partial rail, the other end of the partial rail is still hidden under the cover 3.

  Therefore, power supply start and power supply stop for the partial rails 11X, 11Y, and 11Z are performed in a state where the partial rails 11X, 11Y, and 11Z are hidden under the cover 3. For this reason, the supplied partial rail is always hidden under the cover 3, and the electric shock is suppressed by the cover 3 by the supplied partial rail.

FIG. 10 shows a case where the distance between the two current collecting points P is shorter than the rail length L. In this case, the partial rail does not enter between the two current collecting points P. When the distance between them is longer than the rail length L of the partial rail, there is a state in which the partial rail enters between these two current collection points P, and thus the power feeding operation as shown in FIG.
In this case, for example, between time T2 and time T3, the partial rail 11X enters between the current collectors 41 and 42, that is, between the current collecting points P. During this period, power supply to the partial rail 11X is temporarily stopped and restarted. The However, since these power supply stops and restarts are all performed in a state of being hidden under the cover 3, there is no possibility of electric shock.

  In the present embodiment, as shown in FIG. 9, the case where two current collectors 41 and 42 are used has been described as an example. 3 stability can be improved. In this case, the rail length L of the partial rail may be equal to or less than the protection distance W between the current collecting point P and the end point E of the current collector that is closest to the end point E of the protection section S of the current collector.

[Effect of the first embodiment]
As described above, the present embodiment is configured such that a current collector that collects the power supplied from the power feeding unit by making electrical contact with the power feeding rail is connected to the crane device, and a power feeding rail including the current collecting point P. By covering a part as a protection section S from above, a cover (electric shock protection portion) is provided to protect against electric shock to the power supply rail in the protection section S, and the power supply rail is electrically insulated from each other. It consists of a row of rails, and the rail length L of this partial rail is set to a length equal to or shorter than the protective distance W from the end point E of the protection section S to the current collecting point P. Since the power supply power 25 is supplied only to the partial rails that are in contact with each other, all the partial rails that are in electrical contact with the current collector can be covered with the cover.

For this reason, the partial rail that is being fed is not exposed from the cover, and it is possible to suppress electric shock to the partial rail that is being fed.
Therefore, any moving body such as a person, a vehicle, or a device can safely cross the power supply rail provided in the lane where the crane device travels, and a complicated configuration is used. It is possible to provide a ground power supply method.

In the present embodiment, the power feeding unit is based on an electrical signal obtained from the partial rail, a detector that detects electrical contact between the partial rail and the current collector, and a detection output of the detector. Since the switch is configured to switch and supply power to the corresponding partial rail, the power can be switched and supplied to any partial rail with a simple configuration.
Furthermore, since an electrical signal is output from the crane device to the partial rail with which the current collector is in electrical contact, the electrical contact between the partial rail and the current collector can be detected very easily and accurately. be able to.

  Further, in the present embodiment, the case where the power supply rail is configured by a row of partial rails has been described as an example, but the row of partial rails is provided only in a section where an arbitrary moving body enters the lane of the crane device. The power supply rail may be configured from the above. Thereby, the number of partial rails and switches can be suppressed, and the equipment scale and equipment cost of the crane power feeding system can be reduced.

  Further, in the present embodiment, as the current collector, the power supply rail is supported by the cover of the crane device so as to be rotatable and rolls on the power supply rail, and the physical contact point with the power supply rail serves as a current collection point. Since the wheel for collecting power from the power supply is used, it is possible to realize both the function of collecting power from the power supply rail and the function of supporting the cover above the power supply rail. Furthermore, the configuration of the crane power feeding system can be simplified.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 12 is an explanatory diagram illustrating a relationship between the current collectors and the partial rails of the crane power feeding system according to the second embodiment of the present invention.
In the first embodiment, a case has been described in which the current collector 4 provided on the cover 3 also serves as a wheel that supports the cover 3 on the power supply rail 1. In the present embodiment, a case where the current collector 4 and the wheel are provided separately will be described as an example.

  In the present embodiment, as shown in FIG. 12, a current collector 43 is provided in the center of both end points E of the protection section S. Between the current collector 43 and both end points E, the crane device 6 and Is provided with two insulated wheels 44. Like the current collectors 4A and 4B of FIG. 7 described above, these wheels 44 are wheels that roll on the power supply rails 1A and 1B, and are rotatably supported in the inner chamber of the main body 3A via an axle. . As the insulating structure of the wheel 44, a generally known technique such as an insulating axle or bearing may be used.

On the other hand, the current collector 43 may use wheels in the same manner as the current collectors 4A and 4B of FIG. 7 described above, but the weight of the cover 3 is supported by the wheel 44, and therefore the current collector 43 supports the weight of the cover 3 by the current collector 43. There is no need. For this reason, you may use the slider pressed so that it may slide with the electric power feeding rail 1. FIG.
The position of the current collector 43, that is, the current collecting point P is separated from the both end points E of the cover 3 by a protection distance W. At this time, the rail length L of the partial rails 11X and 11Y is equal to or less than the protection distance W.
In addition, about the other structure of the crane electric power feeding system in this Embodiment, it is the same as that of 1st Embodiment, and detailed description here is abbreviate | omitted.

[Operation of Second Embodiment]
Next, with reference to FIG. 13, the power feeding operation of the crane power feeding system according to the second embodiment of the present invention will be described. FIG. 13 is an explanatory diagram illustrating an example of a power feeding operation of the crane power feeding system according to the second embodiment of the present invention.

When the cover 3 moves in the X direction on the power supply rail 1 and enters the partial rail 11X, the current collector 43 is in electrical contact with the partial rail 11X for the first time at time T1, and the partial current from the partial rail 11X at time T2. Move to the rail 11Y, move from the partial rail 11Y to the partial rail 11Z at time T3, and leave the partial rail Y at time T7.
With such movement of the current collector 43, power is supplied to the partial rail 11X only during the period from time T1 to time T2, and power is supplied to the partial rail 11Y only during the period from time T2 to time T3.

At this time, in the partial rails 111X, 11Y, and 11Z, the timing when there is a possibility of electric shock includes the time when the current collector 43 first contacts with these partial rails and the time when the current collector 43 leaves the partial rail that has been in contact so far. can give.
The current collector 43 is initially in contact with the partial rails 11X and 11Y at times T1 and T2, respectively. The rail length L of these partial rails is equal to or less than the protective distance W from the current collection point P to the end point E of the cover 3. It is. For this reason, at time T1, T2, when the current collector 43 first contacts one end of the partial rail, the other end of the partial rail is already hidden under the cover 3.

On the other hand, the current collector 43 is detached from the partial rails 11X and 11Y at times T2 and T3, respectively, but the rail length L of these partial rails is equal to or less than the protective distance W from the current collection point P to the end point E of the cover 3. It is. For this reason, at time T2 and T3, when the current collector 43 is detached from one end of the partial rail, the other end of the partial rail is still hidden under the cover 3.
Accordingly, the power supply start and power supply stop for the partial rails 11X and 11Y are performed in a state where the partial rails 11X and 11Y are hidden under the cover 3. For this reason, the supplied partial rail is always hidden under the cover 3, and the electric shock is suppressed by the cover 3 by the supplied partial rail.

[Effect of the second embodiment]
Thus, in this embodiment, the current collector of the crane apparatus has a current collection point P in the middle part of the protection section S, and the current collection point P and the end point E of the protection section S are covered by the cover of the crane apparatus. During this period, the wheels that roll on the power supply rail are supported rotatably, so that the cover can be stably supported above the power supply rail even when the current collecting point is located near the center of the cover. Can do.
For this reason, the rail length of a partial rail can be brought close to 1/2 of the protection section S, the number of switching devices provided for each partial rail and each partial rail can be minimized, and the equipment of the crane feeding system Scale and equipment costs can be reduced.

[Extended embodiment]
In each of the above embodiments, the case where two rails are used as the power supply rail 1 has been described as an example, but the present invention is not limited to this. For example, when a three-phase AC power source is used as the power source, in FIG. 5 and FIG. 7 described above, three power supply rails may be provided in parallel.
Moreover, although the description has been made on the assumption that the power supply rail 1 is electrically insulated from the ground potential on the ground, any one of the rails may be electrically connected to the ground potential on the ground. Thereby, the number of wiring cables can be reduced in a part or all of the sections connecting the power supply device 21 and the partial rail 11.

  Moreover, in each embodiment, as shown in FIG. 3 or FIG. 7, a plurality of rails constituting the power supply rail 1 are provided in parallel to the outside of one tire 6 </ b> E of the crane device 6. However, the position where the power supply rail 1 is provided with respect to the crane device 6 is not limited to this. For example, a plurality of rails constituting the power supply rail 1 may be provided in parallel to the inside of the tire 6E of the crane device 6, or the plurality of rails may be provided in parallel by separating the outer side and the inside of the tire 6E. May be. Furthermore, a plurality of rails constituting the power supply rail 1 may be provided separately from the outside or the inside of the left and right tires 6E that support the gantry 60 of the crane device 6.

Moreover, in each embodiment, as shown in FIG. 3 or FIG. 7, the power supply rail 1 is used as a power supply rail for the power supply 25 and also used as a travel rail for traveling the cover 3 of the crane device 6. Although the case has been described as an example, rails according to these purposes may be separately provided in parallel.
In each embodiment, as shown in FIG. 3 or FIG. 7, the case where the power supply rail 1 is provided in the groove 12 provided on the ground G has been described as an example. However, the present invention is not limited to this. Absent. For example, when the moving body that enters the lane is only a person, or when a vehicle or device that can move over some protrusions enters the lane, the power supply rail 1 may be provided on the ground G as it is.

  Moreover, although each embodiment demonstrated the case where the switching device 23 was arrange | positioned for every partial rail 11, you may integrate the function of the several switching device 23 in one switching device. That is, in one switching device, a detector that detects an electrical contact between the partial rail and the current collector based on an electrical signal obtained from each partial rail 11, and a response based on the detection output of the detector It is only necessary to provide a switch for switching and supplying power to the partial rail to be connected, and to connect the switching device and each partial rail in a radial pattern with a wiring cable. Thereby, the number of switching devices can be reduced, and the equipment scale and equipment cost of the crane power feeding system can be reduced.

It is explanatory drawing of the crane electric power feeding system concerning the 1st Embodiment of this invention. It is a side view which shows the structure of a crane apparatus. It is a front view which shows the structure of a crane apparatus. It is a top view which shows the structural example of a container terminal. It is a top view which shows the principal part of a feed rail. It is a front view which shows the principal part of a feed rail. It is sectional drawing which shows the principal part of a feed rail. It is a block diagram which shows the structure of a switch. It is explanatory drawing which shows the relationship between the current collection of the crane electric power feeding system concerning the 1st Embodiment of this invention, and a partial rail. It is explanatory drawing which shows the electric power feeding operation example of the crane electric power feeding system concerning the 1st Embodiment of this invention. It is explanatory drawing which shows the other electric power feeding operation | movement of the crane electric power feeding system concerning the 1st Embodiment of this invention. It is explanatory drawing which shows the relationship between the current collection of the crane electric power feeding system concerning the 2nd Embodiment of this invention, and a partial rail. It is explanatory drawing which shows the electric power feeding operation example of the crane electric power feeding system concerning the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A, 1B ... Feed rail, 11, 11A, 11B, 11X, 11Y, 11Z ... Partial rail, 12 ... Groove, 13 ... Insulation part, 2 ... Feeding part, 21 ... Power supply device, 22 ... Switching part, 23 ... Switching device, 24 ... Power supply request signal, 25 ... Power supply, 3 ... Cover (electric shock protection unit), 4,4A, 4B, 41,42,43 ... Current collector, 44 ... Wheel, 4X ... Axle, 5 ... Support member 5A ... arm, 5B ... hydraulic cylinder, 6 ... crane device, 60 ... frame, 6A ... beam, 6B ... leg, 6C ... base, 6D ... cart, 6E ... tire, 6G ... equipment unit, 6H ... trolley, 6I ... Spreader, 6J ... Cable, 6K ... Command room, 70 ... Container terminal, 71 ... Lane, 72 ... Road, 73 ... Gate, 7A ... Pier, 7B ... Ship, 7C ... Container crane, 9 ... Container, 91 ... Trailer , ... ground, P ... collector point, E ... endpoints (GI), S ... guard interval, L ... rail length (partial rail), W ... protective distance.

Claims (6)

A crane device that operates with power supplied from outside;
A power supply rail provided along the lane in which the crane device travels;
A power supply section for supplying power to the power supply rail,
The crane device includes a current collector that collects power supplied from the power supply unit by being in electrical contact with the power supply rail, and a current collection point at which the power supply rail and the current collector are in electrical contact. Including a part of the power supply rail including a protection section from above to protect the power supply rail in the protection section.
The feed rail is composed of a plurality of rows of partial rails that are electrically insulated from each other,
The partial rail has a rail length equal to or less than a protection distance from an end point of the protection section to the current collecting point,
The power supply unit supplies power only to a partial rail that is in electrical contact with the current collector of the partial rails,
The power feeding rail is composed of a row of the partial rails only in a section in which an arbitrary moving body enters in the lane. In the crane electric power feeding system of Claim 1,
The power feeding unit includes a detector that detects electrical contact between the partial rail and the current collector based on an electrical signal obtained from the partial rail, and a corresponding partial rail based on a detection output of the detector. And a switching device for switching supply / stop of power supply to the crane. In the crane electric power feeding system of Claim 2,
The crane power supply system, wherein the crane device outputs the electrical signal to a partial rail with which the current collector is in electrical contact. In the crane electric power feeding system of Claim 1,
The current collector is rotatably supported by the electric shock protection unit and rolls on the power supply rail, and collects power from the power supply rail using a physical contact point with the power supply rail as a current collection point. A crane power feeding system characterized by comprising wheels that perform. In the crane electric power feeding system of Claim 1,
The current collector has a current collecting point at an intermediate portion of the protection section,
The electric shock protection unit rotatably supports a wheel that rolls on the power supply rail between the current collection point and an end point of the protection section. Crane power supply comprising a crane device that operates by power supply supplied from outside, a power supply rail provided along a lane in which the crane device travels, and a power supply unit that supplies power to the power supply rail A crane power feeding method used in the system,
Collecting the power supplied from the power supply unit by making electrical contact with the power supply rail via the current collector by the crane device; and
By covering a part of the power supply rail including the current collecting point at which the power supply rail and the current collector are in electrical contact with each other as a protective section from above, the crane device is provided for the power supply rail in the protective section. Steps to protect against electric shock,
Of the plurality of partial rails that have the rail length that is equal to or less than the protection distance from the end point of the protection section to the current collection point and that are electrically insulated from each other to form the power supply rail, Supplying power from the power feeding unit only to the partial rail that is in electrical contact with the electrons,
The crane is a method of feeding a crane, characterized in that the feeding rail is composed of a row of the partial rails only in a section in which an arbitrary moving body enters the lane.

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