JP2013129529A - Crane system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crane system eliminating useless coupling of a charging part when the charging is not required.SOLUTION: A crane system includes: a tire type crane traveling on a traveling path by receiving electric power supply from a battery and including a current collector carriage 30 used during the charging of the battery; and a power supply facility 23 installed at a side part of the traveling path and coupled to the current collector carriage 30 during charging to the battery. The current collector carriage 30 includes a retracting mechanism 50 allowing selective movement between a non-charging position in which the current collector carriage passes without being coupled with the power supply facility 23 and a charging position in which the current collector carriage passes by being coupled with the power supply facility 23.

Description

  The present invention relates to a crane system that includes a tire-type crane that travels by battery power feeding and is used for loading and unloading loads such as containers.

  The container yard, which is a place where containers are temporarily stored, is provided with a crane system using a yard crane that loads and unloads containers while traveling along a plurality of traveling lanes provided on the road surface. . As a yard crane, a tire-type portal crane that has a portal shape and travels with tires, so-called RTG (Rubber Tired Gantry Crane), is often used.

  Some RTGs realize traveling along a traveling lane by automatic driving. In this case, the RTG is equipped with a magnetic sensor, while ground guidelines made of a magnetic material are laid along the traveling rail. Then, the position of the RTG is detected by detecting the magnetism of the ground guideline with a magnetic sensor, and the RTG is driven along the ground guideline by controlling the deviation from the ground guideline.

  In addition, from the viewpoint of increasing environmental awareness in recent years, an electric type has attracted attention as an RTG driving method. In such an electrically driven RTG, in particular, a so-called ground-fed RTG is equipped with a battery as a power source of a drive source, and receives power from a power supply provided along a traveling lane to charge the battery. Development is progressing.

  In the conventional ground feed type, for example, as disclosed in Patent Document 1 below, when the RTG changes lanes, the power feed arm of the power feed carriage is lifted up using a suspension mechanism, so that the contact of the power feed arm And contact with the power supply rail. In this case, a megaphone-like insulator guide whose entrance is widened and a guide (flipper) for guiding the running wheels of the feed carriage to the guide rail are used at the entrance of the feed rail.

JP 2010-275057 A

The conventional technology of the charging device disclosed in Patent Document 1 described above corresponds to the amount that the RTG can shift in the width direction perpendicular to the traveling direction in order to unite the position of the power supply carriage with ground equipment such as a power supply rail and a guide rail. Thus, a flipper that performs alignment in the width direction is required at the lane entrance of the lane change unit.
However, since the above-described flipper cannot perform smooth position correction unless the angle range is reduced to some extent with respect to the traveling direction, it is necessary to ensure a sufficient length in the traveling direction of the flipper. For this reason, with the installation of the flipper, the space at the lane entrance increases, and as a result, the space that can be effectively used for cargo handling, which is the original purpose of the container yard, decreases.

  In addition, in an electrically driven RTG that uses a battery as a power source, the power supply carriage on the moving side only needs to be combined with the power source of the fixed ground equipment only during charging, so the charging device is installed in the center rather than the end of the lane. Better to do. However, in the conventional charging structure, when the charging device is installed at the center, the RTG is always united every time it travels through the charging unit, and it is necessary to perform the uniting release operation.

Therefore, the conventional charging device is not preferable from the viewpoint of durability and the like because it may receive many impacts associated with coalescence and release. Further, since it is necessary to decelerate during traveling in order to reduce the impact associated with coalescence and release, there arises a problem that the cargo handling efficiency is lowered.
This invention is made | formed in view of said situation, The place made into the objective is to provide the crane system which can eliminate the unnecessary union of the charging part in the case where charging is unnecessary.

In order to solve the above problems, the present invention employs the following means.
The crane system of the present invention receives a power supply from a battery, travels along a travel route, and includes a tire-type crane provided with a current collector cart used when charging the battery, and is installed at a side portion of the travel route and A power supply facility that merges with the current collector cart when charging the battery, and a charge that passes through the current collector cart without combining with the power supply facility and with the power supply facility. A retraction mechanism is provided that can selectively move between positions.

According to such a crane system of the present invention, the current collecting cart selectively moves between a non-charging position that passes without being combined with the power supply equipment and a charging position that passes through the power supply equipment. Since the retractable mechanism is provided, when the tire-type crane passes the side of the power supply facility, it is possible to combine the current collector truck and the power supply facility only when charging is required. .
As a suitable retraction mechanism, a hydraulic cylinder, a pneumatic cylinder, an electric cylinder or the like is used as an actuator, and a current collecting cart is pulled in the horizontal direction to draw in a non-charging position, a hydraulic cylinder, a pneumatic cylinder, an electric cylinder Extrusion method that uses a cylinder such as a cylinder as an actuator to push the current collector cart horizontally to make it a charging position, a hoisting method that moves the current collector cart up and down using an electric motor, etc., hydraulic cylinder, pneumatic cylinder, There are mechanisms such as a link system that moves a current collecting cart via a link mechanism that swings in conjunction with a cylinder such as an electric cylinder.

In the above-described invention, it is preferable to provide a meandering absorption mode in which the actuator of the retraction mechanism is a cylinder and the cylinder is in a free state. This enables the retraction mechanism and the meandering absorption mechanism to be used together. As the cylinder in this case, a hydraulic cylinder, a pneumatic cylinder, an electric cylinder or the like can be used.
In this case, it is preferable that the mounting portion of the current collector carriage includes an absorption mechanism for yaw rotation and rolling rotation.

  According to the present invention described above, when it is not necessary to charge the battery, the current collector can be passed through the side of the power supply equipment in the non-charging position. Unnecessary coalescence becomes unnecessary. As a result, the number of impacts associated with the union and release of the charging unit is greatly reduced, contributing to the improvement of durability, and the number of decelerations for the purpose of reducing the impact at the time of coalescence is also reduced. Is also effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a main part showing a retracting mechanism of a current collecting carriage using a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder as an embodiment of a crane system according to the present invention, and (a) is a charging united with a power supply facility. The state of the position, (b) is the state of the non-charging position. It is a perspective view showing the outline of the crane system concerning the present invention. It is a front view of the principal part which shows the evacuation mechanism of the current collection trolley which employ | adopted the winding system which moves a current collection trolley up and down using an electric motor etc. It is a front view of the principal part which shows the retraction | saving mechanism of the current collection trolley which employ | adopted the link system which moves a current collection trolley via the link mechanism which rocks | fluctuates interlockingly with a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder. It is a block diagram of the principal part which shows the structural example provided with the absorption mechanism of meandering absorption mode, yaw rotation, and rolling rotation by making the actuator of a retraction | saving mechanism into a hydraulic cylinder, a pneumatic cylinder, or an electric cylinder. It is a top view which shows the 1st modification regarding the absorption mechanism of a yaw rotation and a rolling rotation. FIG. 7 is a side view of FIG. 6. It is a structure and operation | movement explanatory drawing of the 2nd modification regarding the absorption mechanism of yaw rotation and rolling rotation.

Hereinafter, an embodiment of a crane system according to the present invention will be described with reference to the drawings.
A crane system 1 shown in FIG. 2 includes a plurality of traveling lanes (traveling routes) R installed in a container yard Y in which containers C are accumulated, and a plurality of tire cranes 10 that travel along the traveling lanes R (hereinafter, referred to as “crane lanes”). , Referred to as “RTG”), and a power feeding unit 20 provided in each traveling lane R. In the crane system 1 of FIG. 2, only one of a plurality of traveling lanes R is shown.

  The travel lane R defines the travel range of each RTG 10. On the road surface of the traveling lane R, ground guidelines (not shown) are laid on one side in the width direction of the RTG 10. This ground guideline is for guiding the traveling direction of the RTG 10 and is a wire containing a magnetic material. In the present embodiment, the number of travel lanes R provided in the container yard Y can be appropriately changed according to various conditions.

The RTG 10 loads and unloads cargo such as the container C (hereinafter simply referred to as “container C”) from the trailer and accumulates it in the container yard Y, or loads the container C accumulated in the container yard Y onto the trailer T. It is a crane device to perform.
The RTG 10 includes a portal crane body 11, tire rows 12 provided on both sides in the width direction of the crane body 11, magnetic sensors (not shown) provided in the periphery of the tire row 12 in the crane body 11, a crane A current collector truck 30 provided at a position directly above the tire row 12 on one side in the width direction of the main body 11, an electric chamber 14 provided at a position immediately above the current collector truck 30, and the opposite of the electric chamber 14 in the crane main body 11. The battery 15 provided in the position of the side and the suspension device 16 provided in the top part of the crane main body 11 are provided.

According to the RTG 10 configured as described above, the battery 15 is charged with the electric power supplied from the power supply unit 20 to the current collector carriage 30, and the tire train 12 is driven using this electric power as a driving source. The RTG 10 automatically travels in accordance with the ground guideline by detecting the magnetism of the ground guideline by the magnetic sensor to recognize the current position of the RTG 10 and controlling the deviation from the ground guideline.
The electric power charged in the battery 15 is also used as a drive source for driving the suspension device 16 when the container C is loaded or unloaded.

On the other hand, the power supply unit 20 constituting the crane system 1 supplies power to the RTG 10. As shown in FIG. 2, the power supply system 20 includes a plurality of external power sources 21 installed at one end portion of the traveling lane R along the traveling direction of the RTG 10, and one end connected to the external power source 21. And a power supply facility 23 provided at a predetermined position of the supply wiring path 22.
The number and installation positions of the external power sources 21 are design items that are not limited to the present embodiment. For example, the external power sources 21 may be provided for each traveling lane R, or may be shared by a plurality of traveling lanes R. May be.

Hereinafter, the current collector truck 30 constituting the RTG 10 will be described in detail with reference to FIGS. 1 and 2.
The current collecting cart 30 is supplied with electric power for charging by combining (connecting) with the power supply equipment 23 constituting the power supply unit 20. The current collecting cart 30 includes a retraction mechanism 50 that enables reciprocal movement in the horizontal direction (arrow S in the drawing) from the side of the crane body 11. As shown in FIG. 1A, the retraction mechanism 50 according to the present embodiment includes a charging position where the current collecting cart 30 is combined with the power supply facility 23 and a current collecting cart as shown in FIG. It is possible to selectively move between a non-charge position 30 through which 30 passes without being combined with the power supply facility 23.

The movement of the current collecting carriage 30 between the charging position and the non-charging position described above is performed by extending and contracting a cylinder 51 such as a hydraulic cylinder, a pneumatic cylinder or an electric cylinder provided as an actuator. In the following description, a case where a hydraulic cylinder is adopted as the cylinder 51 will be described, but the present invention is not limited to this.
The cylinder 51 is fixedly supported at a proper position on the side of the crane body 11, that is, at a position facing the power supply unit 20, and the current collector carriage 30 is supported at the tip of a piston rod 51 b that operates by receiving hydraulic pressure. ing. In this case, the cylinder 51 receives a hydraulic pressure and pulls the current collecting cart 30 in the horizontal direction to make it a non-charging position, or receives the hydraulic pressure and pushes the current collecting cart 30 in the horizontal direction to set the charging position. Any extrusion method can be used.

Further, in the illustrated current collecting carriage 30, reference numeral 31 in the figure is an upper guide rail pair, 32 is a lower guide rail pair, 33 is a carriage body, 34 is a guide roller in the horizontal direction (width direction of the RTG 10), and 35 is an upper and lower The direction guide roller 36 is a current collecting unit. The current collecting unit 36 is a portion that receives power and charges the battery 15 when a plurality of current collectors are connected to the insulated trolley wire 24 of the power supply unit 20. The wiring system from the current collecting unit 36 to the battery 15 is not shown.
On the other hand, in the power supply facility 23, reference numeral 24 in the figure is an insulated trolley wire for power supply connected to the external power source 21, 25 is a guide groove for positioning in the horizontal direction by engaging with the guide roller 34, and 26 is upper and lower It is a traveling rail of the guide roller 35 for positioning in the direction.

In the crane system 1 configured as described above, the current collector truck 30 selectively selects between a non-charging position where the power collecting carriage 30 passes without being combined with the power supply facility 23 and a charging position where the power collecting facility 23 passes through. Since the movable retracting mechanism 50 is provided, when the RTG 10 passes the side of the power supply facility 23, the current collecting cart 30 and the power supply facility 23 are connected only when the battery 15 needs to be charged. It can be merged.
More specifically, the RTG 10 that travels along the travel lane R by the cargo handling work performs normal work with the current collector carriage 30 in the non-charging position. It does not merge with the power supply facility 23.

  However, when the remaining amount of the battery 15 is low and charging is required, the retraction mechanism 50 is operated to move the current collecting cart 30 to the charging position. This operation is performed based on a signal for detecting the remaining amount of the battery 15 and a signal for detecting that the RTG 10 has approached the power supply facility 23, or by a switch operation or the like based on the judgment of the driver. Is performed by outputting an operation signal. As a result, when the current collector cart 30 passes the side of the power supply facility 23, the current collector cart 30 and the power supply facility 23 are combined, and the insulated trolley wire 24 and the current collector of the current collector unit 36 come into contact with each other. Therefore, the battery 15 is charged. Note that a guide mechanism (not shown) such as a flipper is provided on the inlet side of the power supply facility 30 as necessary so that it can be smoothly combined.

At this time, the union of the current collecting carriage 30 and the power supply equipment 23 is positioned in the horizontal direction substantially perpendicular to the traveling direction by the engagement of the guide roller 34 and the guide groove 25, and the guide roller 35 and the traveling rail 26 are aligned. Positioning in the vertical direction is performed by the engagement. Further, a stable contact is maintained between the insulated trolley wire 24 and the current collector of the current collector unit 36 by a known spring structure (not shown) or the like.
After the battery 15 is charged with the required amount, the retracting mechanism 50 is operated by the operation signal from the control unit at the traveling position where the current collecting carriage 30 is not united with the power supply equipment 23, and the current collecting carriage 30 is moved away from the charging position. Move to charging position. As a result, in the subsequent cargo handling operation, the current collecting cart 30 does not merge even if it passes through the side of the power supply facility 23.

  Therefore, the combination of the current collecting cart 30 and the power supply facility 23 is limited to the case where the battery 15 needs to be charged, and thus the number of times of combining can be minimized. That is, when it is not necessary to charge the battery 15, it is possible to pass the side of the power supply facility 23 with the current collector cart 30 in the non-charging position. Unnecessary coalescence becomes unnecessary, and the number of impacts associated with the coalescence and release of the charging unit is greatly reduced, contributing to improvement in durability. In addition, since the number of times of decelerating operation that lowers the traveling speed of the RTG 10 is reduced for the purpose of reducing the impact at the time of coalescence, it is also effective in improving the cargo handling efficiency.

  By the way, the retraction mechanism 50 described above pulls the current collecting carriage 30 in the horizontal direction using the cylinder 51, or pulls the current collecting carriage 30 in the horizontal direction using the cylinder 51. However, the present invention is not limited to this.

As another preferred retraction mechanism, for example, a retraction mechanism 50A shown in FIG. 3 is provided with a mechanism for winding or unwinding the wire 53 using a drive source such as an electric motor 52, and the current collecting cart 30 is moved up and down. There is a hoisting method to move. In this case, the non-charging position of the current collector truck 30 is higher than the uppermost part of the power supply facility 23.
Further, for example, the retracting mechanism 50B shown in FIG. 4 may be a link system that moves the current collecting cart 30 via a link mechanism 54 that swings in conjunction with the cylinder 51A. In this case, when the cylinder 51A is operated, the current collecting cart 30 connected to the link mechanism 54 that moves as indicated by the arrow R swings and moves between the charging position and the non-charging position so as to draw a substantially arc. To do.

By the way, the crane system 1 mentioned above is provided with the mechanism (not shown) which absorbs the meandering part which arises at the time of driving | running | working of RTG10 besides the evacuation mechanism 50. FIG.
Therefore, the retracting mechanism 50C of the embodiment shown in FIG. 5 incorporates a function for absorbing the meandering generated when the RTG 10 travels. That is, a meandering absorption mode for absorbing meandering portion of the RTG 10 is provided by using a hydraulic cylinder as an actuator of the retraction mechanism 50C to form a cylinder 51B and setting the cylinder 51B to a free state.

More specifically, the cylinder 51 </ b> B of the retracting mechanism 50 </ b> C supports the current collecting cart 30 via the power supply device expansion / contraction unit 60. The power supply device extension / contraction unit 60 includes an outer cylinder 61 fixed to the crane body 11. A cylinder 51B supported by the crane body 11 is installed inside the outer cylinder 61, and an extendable rod 62 is connected to the tip of the piston rod 51b.
On the other end side of the telescopic rod 62, that is, on the end opposite to the end connected to the piston rod 51 b, the current collecting cart 30 is supported via a shift angle corresponding portion 63. The deviation angle corresponding portion 63 is a portion connected through the pin 63a in the vertical direction. Therefore, the current collecting cart 30 is substantially horizontal with respect to the telescopic rod 62 with the pin 63a of the deviation angle corresponding portion 63 as a fulcrum. The upper relative movement is possible.

Further, when the telescopic rod 62 is released by releasing the hydraulic pressure of the cylinder 51B, the telescopic rod 62 can move in the telescopic direction with the outer cylinder 61 as a guide according to the external force.
Therefore, when the cylinder 51B is brought into a free state in a state where the current collecting carriage 30 is combined with the power supply equipment 23, the telescoping rod 62 of the retracting mechanism 50C absorbs the meandering generated on the RTG 10 side. The function of the retracting mechanism and the function of the meander absorbing mechanism are combined. That is, the cylinder 51B requires hydraulic pressure only when moving between the charging position and the non-charging position, and once combined, there is no problem even if the hydraulic pressure is released and the meandering ball seeding mode is set. Note that a pneumatic cylinder or an electric cylinder can be used instead of the hydraulic cylinder as the actuator of the retracting mechanism 50C.

  Further, as described above, since the shift angle corresponding portion 63 is provided in the mounting portion of the current collector cart 30, when the RTG 10 travels while being charged, even if the yaw rotation and rolling rotation occur in the RTG 10, this is absorbed. It becomes possible. That is, since the deviation angle corresponding part 63 functions as a rotation absorbing mechanism that absorbs the yaw rotation and rolling rotation of the RTG 10, it is possible to prevent an extra external force from acting on the combined part of the current collecting cart 30 and the power supply equipment 23. .

Further, the above-described rotation absorbing mechanism is not limited to the shift angle corresponding portion 63 using the pin 63a, and may be configured as a first modified example and a second modified example as shown in FIGS. Good.
In the first modified example shown in FIGS. 6 and 7, a telescopic beam 70 having a plurality of stages (three stages in the illustrated example) is used. The telescopic beam 70 has a configuration in which a plurality of rollers 71 are interposed on sliding surfaces where inner and outer wall surfaces of the outer cylinder 70a, the inner cylinder 70b, and the tip beam 70c are in contact. In this case, the gap between the roller 71 and the telescopic beam 70 can be operated by yaw rotation and rolling rotation. Although not shown, a piston rod of a cylinder (not shown) is pin-coupled to one end of the tip beam 70c.

On the other hand, the other end portion of the tip beam 70c to which the current collector cart 30 is connected is a connecting portion in which a vertical pin 72 and a horizontal pin 73 are interposed. Therefore, when the RTG 10 travels while being charged, even if the yaw rotation and rolling rotation occur in the RTG 10, the operation of the telescopic beam 70 and the pins 72 and 73 that can operate within a predetermined range and the roller 71 and the telescopic beam 70 It can be absorbed by the gap.
Further, as in the second modification shown in FIG. 8, by arranging a plurality of ball casters 75 at the other end of the tip beam 70 c, when pressed in the direction of the current collector cart 30, the ballast is connected to the current collector cart 30. The relative inclination with the pressed plate 76 is zero.

As described above, when the battery 15 does not need to be charged, the current collector carriage 30 is placed in the non-charging position so that it can pass through the side of the power supply equipment 23. Unnecessary coalescence of the charging unit is unnecessary, and the crane system 1 improves the durability of the charging unit and the cargo handling efficiency.
In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary, it can change suitably.

1 Crane system 10 Tire crane (RTG)
DESCRIPTION OF SYMBOLS 11 Crane main body 15 Battery 20 Power supply unit 23 Power supply equipment 24 Insulation trolley wire 30 Current collector truck 36 Current collection unit 50, 50A, 50B, 50C Retraction mechanism 51, 51A, 51B, 51C Cylinder 52 Electric motor 53 Wire 54 Link mechanism 60 Power supply device Telescopic part 61 Outer cylinder 62 Telescopic rod 63 Deviation angle corresponding part 70 Telescopic beam R Travel lane

Claims (3)

A tire-type crane that receives power supply from a battery and travels along a travel route and includes a current collector cart used when charging the battery; and a tire-type crane that is installed on a side of the travel route and charges the battery when the battery is charged. A power supply facility combined with the electric cart,
The current collecting cart includes a retraction mechanism that is selectively movable between a non-charging position that passes without being combined with the power supply facility and a charging position that passes through the power supply facility. A crane system characterized by that.   The crane system according to claim 1, wherein the actuator of the retraction mechanism is a cylinder, and a meandering absorption mode for setting the cylinder to a free state is provided. The crane system according to claim 2, wherein the mounting portion of the current collector carriage includes an absorption mechanism for yaw rotation and rolling rotation.

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