JP7005374B2 - Crane system and emergency power supply method - Google Patents

Description

The present invention relates to a crane system and an emergency power supply method.

For example, there are crane devices such as container cranes and jib cranes that handle cargo at ports. In the conventional crane device, a system power source (commercial power source) and an engine generator are used as main power sources (see Patent Document 1).

On the other hand, there are generally emergency engine generators that can supply electric power to various electric devices.

Japanese Unexamined Patent Publication No. 2013-006641

If the system power supply fails or the engine generator fails during the operation of the crane device and power supply to each drive unit becomes impossible, the crane device's hanger and suspended load are urgently evacuated. There are times when I have to.

However, it is difficult to supply power to the crane device using a general emergency engine generator because the crane device may generate a large amount of regenerative power. In order to supply power from the emergency engine generator, it is necessary to modify the power distribution section of the crane device to correspond to the emergency engine generator, which takes time and effort and hinders emergency evacuation.

On the other hand, it is possible to consider modifying the power distribution unit of the existing crane device in advance. However, in order to make such a modification, it is necessary to suspend the existing crane device during the modification, which reduces the operating efficiency of the cargo handling facility. For example, in a facility that handles cargo on a container ship, the crane device may operate day and night, and it is not desirable to suspend the crane device for a long time. In addition, if a circuit that is not normally used is installed in the power distribution section of the crane device, normal maintenance is required and maintenance costs increase, even though it is used only in rare situations such as when power cannot be supplied. Occurs.

An object of the present invention is to provide a crane system and an emergency power supply method capable of promptly supplying emergency power to a crane device when power supply to the crane device becomes impossible.

The crane system according to the present invention is
With an engine generator
An inverter that converts the power of the engine generator into AC power,
A connection part that can be connected to a container crane and outputs the power converted by the inverter,
A regenerative resistor that absorbs the power returned from the connection to the inverter,
With an emergency power supply ,
Boom part and
An undulating device that undulates the boom portion and
A traveling device that travels along the rails and
A hoisting device with a hoisting motor and
An electric facility that supplies the electric power sent from the engine generator to the hoisting motor and returns the regenerative power generated during braking of the hoisting motor to the emergency power supply device.
With the container crane,
It was configured to be equipped with.

The emergency power supply method according to the present invention is
In the above crane system, the method of supplying electric power from the emergency power supply device to the container crane is adopted.

According to the present invention, there is an effect that emergency power can be promptly supplied to the crane device when the power supply to the crane device becomes impossible.

It is a block diagram which shows the emergency power supply device for a crane of embodiment of this invention. It is an external view which shows the emergency power supply device for a crane of an embodiment. It is an external view which shows the modification of the emergency power supply device for a crane of an embodiment. It is a perspective view which shows the crane apparatus of embodiment. It is a block diagram which shows the electric equipment of the crane apparatus of embodiment. It is a waveform diagram which shows the voltage and current of each output of (A) engine generator, (B) harmonic filter, (C) inverter and (D) sine wave filter of the emergency power supply device for cranes.

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

(Embodiment 1)
FIG. 1 is a block diagram showing an emergency power supply device for a crane according to an embodiment of the present invention. FIG. 2 is an external view showing an emergency power supply device for a crane according to an embodiment.

The crane emergency power supply device 1 of the present embodiment is a device capable of supplying emergency power to the crane device 100 (FIG. 4) that handles cargo at a port. The emergency power supply device 1 for a crane includes an engine generator 10, an electric room 20 for converting and transmitting electric power, and a portable table (hereinafter referred to as a portable table) 40 (hereinafter referred to as a portable table) on which these are mounted (FIG. 2). And have.

The engine generator 10 is, for example, a diesel engine generator, and generates AC power from the power obtained by burning fuel in an internal combustion engine.

The electric chamber 20 includes a harmonic filter 21, an inverter 22, a sine wave filter 23, a regenerative unit 24, a regenerative resistor 25, and an interrupter 26 as a harmonic suppression circuit as a first transmission system. The first transmission system mainly transmits electric power for driving the motor of the crane device 100. The output stage of the first transmission system (for example, the subsequent stage of the interrupter 26) is provided with a connector 31 as a connection portion that can be connected to the motor system power cable of the crane device 100.

The harmonic filter 21 is provided between the engine generator 10 and the inverter 22 and suppresses the harmonics transmitted between them. By suppressing the harmonics, the harmonics generated by the switching control of the inverter 22 are suppressed from being mixed into the engine generator 10, and the AC current and the AC voltage of the engine generator 10 can be stabilized. As a result, the harmonic reverse phase current can be suppressed and the capacity increase of the engine generator 10 can be suppressed. The harmonic filter 21 includes, for example, inductors L1 and L2 connected in series to one power line, inductors L3 connected in series between these connection points and another power line, and capacitances C1 and C2. Consists of.

The inverter 22 converts the AC output of the engine generator 10 into AC power having a predetermined frequency. Further, the inverter 22 has a function of sending the regenerative power to the regenerative unit 24 side when the regenerative power is input from the output side.

The sine wave filter 23 converts the rectangular wave output voltage of the inverter 22 into a sine wave shape. In the crane device 100, since the motor is driven by PWM (Pulse Width Modulation) control of the inverter, if the voltage on the power supply side has a rectangular wave shape, normal PWM control is hindered. However, by supplying electric power through the sine wave filter 23, the PWM control on the crane device 100 side can be normally performed. The sine wave filter 23 includes, for example, an inductance LS1 provided in one power line, a capacitance C1 provided between a plurality of power lines, and the like.

The regenerative unit 24 converts the regenerative power sent from the inverter 22 into a current waveform that can be consumed by the regenerative resistor 25.

The regenerative resistor 25 converts the regenerative power into power or heat and consumes it.

The interrupter 26 is provided, for example, after the sine wave filter 23, and switches the interruption of the output of the first transmission system.

The electric room 20 further includes an interrupter 28 and a transformer 29 as a second transmission system. The second transmission system transmits electric power for driving auxiliary equipment (brake, lighting, etc.) of the crane device 100 that does not generate large regenerative electric power. The output stage of the second transmission system is provided with a connector 32 as a connection portion that can be connected to the power cable for auxiliary equipment of the crane device 100.

The interrupter 28 switches the interruption of the output of the second transmission system.

The transformer 29 converts the AC voltage output by the engine generator 10 into an AC voltage having a size for an auxiliary machine.

The portable table 40 has a floor portion 41 and side wall portions 42 at both ends in the longitudinal direction, and the upper portion and the side portion in the lateral direction are open, and the floor portion 41 and the side wall portion 42 correspond to the container. It has the same dimensions as the part to be used. Further, a suspended portion similar to a container on which a suspending tool is hung is provided on the upper portion of the side wall portion 42. According to such a portable table 40, the arrangement location of the emergency power supply device 1 for a crane can be easily changed by using the crane device 100 or a top lifter (forklift dedicated to container transportation) in the cargo handling facility.

FIG. 3 is an external view showing a modified example of the emergency power supply device for a crane according to the embodiment.

As shown in FIG. 3, a towed carriage 40A provided with wheels 45 may be applied to the emergency power supply device 1 for a crane instead of the portable platform 40. According to such a configuration, in the cargo handling facility, the arrangement location of the emergency power supply device 1 for a crane can be easily changed by using a towing vehicle.

<Crane system>
FIG. 4 is a perspective view showing the crane device of the embodiment. FIG. 5 is a block diagram showing the electrical equipment of the crane device of the embodiment.

The crane system of the embodiment according to the present invention includes the above-mentioned emergency power supply device 1 for a crane and the crane device 100 as shown in FIG.

The crane device 100 is, for example, a container crane (also referred to as a gantry crane), and includes a driver's cab 110, a boom portion 112, a machine room 114, a hanger device (spreader) 116, and a traveling device 118 traveling along a rail.

The machine room 114 is a hoisting device having a hoisting motor, a traversing device for moving the hanger device 116 in the horizontal direction, an undulating device for undulating the boom portion 112, a moving device for moving the cab 110, and control of each of these electric parts. And accommodates the electrical equipment 200 that supplies power.

As shown in FIG. 5, the electric facility 200 of the crane device 100 has a distribution unit 210 that inputs and distributes electric power from a system power source, and a switch that has a switch and draws current from the distribution unit 210 to the motor control unit 215 side. It is provided with 1 lead-in portion 212. Further, the electrical equipment 200 includes a second lead-in unit 222 that has a switch and draws a current from the power distribution unit 210 to the auxiliary equipment control unit 224 side. Further, the electric equipment 200 includes a power cable 231 and 232 that can be connected to the emergency power supply device 1 for a crane, and an intermittent device 233 that switches the connection between the power cables 231 and 232 and the first and second lead-in portions 212 and 222. To prepare for. The power cables 231 and 232 can be connected to the connectors 31 and 32 via the plugs P1 and P2. The power cables 231 and 232 and the plugs P1 and P2 correspond to an example of the power input unit according to the present invention.

The distribution unit 210 includes a transformer 210a that converts the AC voltage of the system power supply into a high AC voltage for driving the motor, and a transformer 210b that converts the AC voltage of the system power supply into a low AC voltage for auxiliary equipment. Through these, the distribution unit 210 distributes the electric power supplied from the system power supply to the motor control unit 215 side and the auxiliary machine control unit 224 side.

An AC reactor unit 214 that buffers the inrush current and a motor control unit 215 that controls the motor M of each system are provided in the subsequent stage of the first lead-in unit 212. The motor control unit 215 includes a common converter 215A and a plurality of inverters 215B, and drive currents are output from the plurality of inverters 215B to the motors M of the plurality of systems, respectively. When the power running operation and the regenerative operation occur simultaneously in the plurality of inverters 215B, the common converter 215A transfers power between the plurality of inverters 215B and performs power conversion so that the power running power and the regenerative power are offset. Further, the common converter 215A performs power conversion so as to supply power or transmit regenerative power that is not offset between the input side and the plurality of inverters 215B. The plurality of inverters 215B output a drive current to each motor M based on the drive request of each motor M from the cab 110, for example, by using PWM control. The plurality of motors M include a plurality of hoisting motors for driving the hoisting device, a plurality of traversing motors for driving the traversing device, a moving motor for the cab 110, and a plurality of traveling motors for the traveling device 118.

An auxiliary machine control unit 224 for controlling various auxiliary machines F1 and F2 is provided in the subsequent stage of the second lead-in unit 222. The auxiliary machine control unit 224 has a plurality of switches, and controls the driving of the auxiliary machines F1 and F2 by switching the opening and closing of the switches based on the command from the driver's cab 110. The auxiliary machines F1 and F2 include a disc brake (DB) and a brake unit (BU) for braking the traveling of the traveling device 118, a brake (TH) for braking each device, and the like.

<Operation during normal power supply>
When the electrical equipment 200 is started and the interrupters of the first lead-in unit 212 and the second lead-in unit 222 are closed during normal power supply with power supply from the grid power supply, the motor control unit 215 is required via the AC reactor unit 214. AC power is supplied. Further, low voltage AC power is supplied to the auxiliary control unit 224. In the motor control unit 215, a plurality of inverters 215B operate in response to a command from the cab 110, and the torque requested by each motor M is output. Further, in the auxiliary machine control unit 224, the switch is switched according to the command from the driver's cab 110 to drive the requested auxiliary machines F1 and F2.

When braking each motor M, a relatively large regenerative power is returned to the inverter 215B, and if this regenerative power cannot be consumed by the power running of another inverter 215B, the regenerative power is returned from the common converter 215A to the distribution unit 210 side. .. This regenerative power is absorbed by the grid power supply via the power line.

<Emergency power supply method>
When the power supply from the grid power supply becomes impossible, the worker first transports the crane emergency power supply device 1 to the vicinity of the crane device 100. Next, the worker cuts the interrupter of the first pull-in portion 212 and the second pull-in portion 222 of the crane device 100, and connects the power cables 231 and 232 to the connectors 31 and 32 of the emergency power supply device 1 for the crane. The intermittent device 233 is closed. Then, the worker starts the emergency power supply device 1 for the crane.

As a result, the engine generator 10 is driven to start power generation. The electric power generated by the engine generator 10 is transmitted from the first lead-in portion 212 to the electric equipment 200 of the crane device 100 via the harmonic filter 21, the inverter 22, and the sine wave filter 23 in the first transmission system. .. The electric power input from the first lead-in unit 212 is sent to the motor control unit 215 and used to drive each motor M.

FIG. 6 is a waveform diagram showing the voltage and current of each output of (A) engine generator, (B) harmonic filter, (C) inverter and (D) sine wave filter of the emergency power supply device for cranes.

In the first transmission system, the harmonics are suppressed by the presence of the harmonic filter 21 between the engine generator 10 and the inverter 22, and the output of the engine generator 10 is as shown in FIG. 6A. The waveform is stable. As a result, the harmonic reverse phase current can be suppressed and the capacity increase of the engine generator 10 can be suppressed.

Further, in the first transmission system, an inverter 22 is provided to distribute the regenerative power to the regenerative resistance 25 side. On the other hand, the output voltage of the inverter 22 has a rectangular wave shape as shown in FIG. 6C, and the motor control unit 215 of the crane device 100 does not operate normally as it is. However, by providing the sine wave filter 23 in the subsequent stage of the inverter 22, the AC voltage output to the crane device 100 becomes a sine wave shape (see FIG. 6D), which is normal in the motor control unit 215 of the crane device 100. PWM control can be realized.

When relatively large regenerative power is returned to the emergency power supply device 1 for cranes during braking of each motor M, the inverter 22 sends the regenerative power to the regenerative unit 24, and the regenerative power 25 consumes the regenerative power. This prevents the regenerative power from being input to the engine generator 10.

In the second transmission system of the emergency power supply device 1 for a crane, the electric power generated by the engine generator 10 is transformed by the transformer 29 and output from the second lead-in unit 213 to the electric facility 200 of the crane device 100. .. The electric power input from the second lead-in unit 213 is sent to the auxiliary equipment control unit 224 and used to drive the auxiliary equipment F1 and F2.

The operator of the crane device 100 can operate the crane device 100 in the same manner as usual by supplying electric power from the emergency power supply device 1 for the crane, whereby can perform an evacuation operation such as retracting a hanging tool or a suspended load. ..

When there are a plurality of crane devices 100 in the port facility where power cannot be supplied from the grid power supply, the worker uses a top lifter or the like to sequentially use one crane emergency power supply device 1 for each crane device 100. Transport to the vicinity of. Then, power is sequentially supplied from the crane emergency power supply device 1 to each crane device 100 to perform an evacuation operation. As a result, one crane emergency power supply device 1 can perform the evacuation operation of the plurality of crane devices 100.

As described above, the emergency power supply device 1 for a crane of the present embodiment includes an engine generator 10, an inverter 22, and a regenerative resistor 25. Therefore, the crane device 100 can be operated by supplying electric power from the emergency power supply device 1 for a crane without making major modifications to the crane device 100 that operates by receiving electric power from the system power supply. Specifically, when power is supplied to the crane device 100 using only a general engine generator, a regenerative resistor that absorbs the regenerative power to the crane device 100 and a regenerative resistor that sends this power to the regenerative resistor when the regenerative power is generated are sent. It is necessary to add a switch. In this case, it takes a long time to modify and the cost for performing these maintenances also increases. However, the crane emergency power supply device 1 of the present embodiment can consume and absorb the regenerative power returned from the crane device 100. Therefore, it is only necessary to provide the electric equipment 200 of the crane device 100 with a configuration in which electric power is input from the emergency power supply device 1 for the crane, and a long suspension period does not occur due to the expansion.

Further, according to the emergency power supply device 1 for a crane of the embodiment, a harmonic filter 21 is provided between the inverter 22 and the engine generator 10. Thereby, even if the switching control according to the output is performed by the inverter 22, the waveforms of the output voltage and the output current of the engine generator 10 can be stabilized. Therefore, the output rating of the emergency power supply device 1 for a crane can be set larger than the current capacity of the engine generator 10.

Further, according to the emergency power supply device 1 for a crane of the embodiment, a sine wave filter 23 is provided after the inverter 22. As a result, the voltage waveform output to the crane device 100 becomes a sinusoidal shape, and the PWM control of the inverter 215B that drives the motor M of the crane device 100 can be normally executed.

Further, according to the emergency power supply device 1 for a crane of the embodiment, each component is mounted on the portable table 40 or the towed vehicle 40A. Therefore, the emergency power supply device 1 for a crane can be easily transported by a transport means (top lifter, towing vehicle, or the like) normally provided in a cargo handling facility. As a result, when the system power supply is lost, the crane emergency power supply device 1 can be easily transported to the vicinity of the crane device 100, and the crane device 100 can be supplied with emergency power.

The embodiment of the present invention has been described above. However, it is not limited to the above embodiment of the present invention. For example, the crane device 100 for supplying emergency electric power is not limited to a container crane or a jib crane, and various crane devices can be applied. Further, in the above embodiment, the configuration is shown in which the emergency power supply device 1 for a crane includes a second transmission system for supplying electric power for auxiliary equipment without going through the inverter 22, but the second transmission system is omitted. You may. In this case, one end of the power line connectable to the emergency power supply device for the crane may be connected upstream of the transformer 210b of the crane device 100 as the power input unit for inputting the power for the auxiliary machine. Then, the electric power of the first transmission system may be input from here, and the electric power of the auxiliary machine may be supplied. In addition, the details shown in the embodiment, such as the specific circuit configuration of the harmonic filter and the specific circuit configuration of the sine wave filter, can be appropriately changed without departing from the spirit of the invention.

1 Emergency power supply for crane 10 Engine generator 20 Electrical room 21 Harmonic filter (harmonic suppression circuit)
22 Inverter 23 Sine wave filter 24 Regenerative unit 25 Regenerative resistor 31, 32 Connector (connection part)
40 Portable stand (stand)
42 Side wall 40A Towed trolley 45 Wheels 100 Crane device 200 Electrical equipment 210 Power distribution section 212 1st lead-in section 214 AC reactor section 215 Motor control section 215A Common converter 215B Inverter M motor 222 2nd lead-in section 224 Auxiliary machine control section F1, F2 auxiliary machine 233 intermittent device 231 and 232 power cable (power input section)
P1, P2 plug (power input section)

Claims (7)

With an engine generator
An inverter that converts the power of the engine generator into AC power,
A connection part that can be connected to a container crane and outputs the power converted by the inverter,
A regenerative resistor that absorbs the power returned from the connection to the inverter,
With an emergency power supply ,
Boom part and
An undulating device that undulates the boom portion and
A traveling device that travels along the rails and
A hoisting device with a hoisting motor and
An electric facility that supplies the electric power sent from the engine generator to the hoisting motor and returns the regenerative power generated during braking of the hoisting motor to the emergency power supply device.
With the container crane,
Crane system equipped with . A harmonic suppression circuit is further provided between the inverter and the engine generator.
The crane system according to claim 1. A sine wave filter is further provided between the inverter and the connection portion.
The crane system according to claim 1 or 2. The components from the engine generator to the connection portion and the regenerative resistance are mounted on a portable table.
The crane system according to any one of claims 1 to 3. Wheels for moving the platform are provided,
The crane system according to claim 4. The container crane does not include a regenerative resistor that absorbs the regenerative power.
The crane system according to any one of claims 1 to 5 . The emergency power supply method for supplying electric power from the emergency power supply device to the container crane in the crane system according to any one of claims 1 to 6 .

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