JP2008247590A - Crane device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably feed required electric power even when engine speed is reduced. <P>SOLUTION: This crane device includes: an engine generator 1 having a generator 12 driven by an engine to feed driving electric power 15; an inverter 44 converting the voltage and frequency of the driving electric power 15 and outputting it as auxiliary electric power; and a switching unit 5 changing over and feeding either of the driving electric power 15 and auxiliary electric power 16 to the auxiliary machine installation 6 of the crane device. A controller 7 controls the engine speed of the engine generator 1 and the switching unit 5 according to the operating condition of the crane device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crane apparatus, and more particularly to a crane apparatus that controls the engine rotation speed of an engine power generation apparatus that generates drive power.

  In a yard such as a harbor, a crane apparatus that loads and unloads a cargo such as a container with respect to a ship or a trailer uses a plurality of electric motors to perform operations such as raising and lowering the cargo, and further running and traversing a gantry. In order to supply operating electric power to these electric motors, the engine-driven power generation system is configured to supply necessary electric power to each electric motor using an engine power generator that drives the electric generator using a diesel engine.

  In such a crane apparatus, the maximum load is applied when the load is wound up, but the load fluctuation is large in some cases because little electric power is required when the load is lowered. Therefore, a large-scale diesel engine or generator is required to supply the appropriate power from the generator at the maximum load, but the equipment scale exceeds the average load, so in terms of equipment costs and operating costs. It was inefficient.

  Conventionally, such a crane device is provided with a power storage device, and the engine power generator always generates power, and power is supplied in parallel from the power storage device at the time of maximum load, and surplus power generated during regeneration is supplied to the power storage device. An electric storage device has been proposed (see, for example, Patent Document 1). Thereby, since electric power is temporarily supplied from the power storage device to the electric motor, the scale of the diesel engine and the generator can be reduced, and the efficiency can be improved in terms of equipment cost and operation cost.

JP 2001-163574 A

  In the above-described conventional crane device, the maximum load power required when hoisting the load can be temporarily supplemented with the stored power of the power storage device. However, in order to stably supply such maximum load power, the engine is always used. The generator is operating at a constant rotational speed. For this reason, the generated power becomes excessive and the fuel efficiency of the engine power generator deteriorates when the load is low, such as during idling when the crane is not performing crane operations such as hoisting of a load, traveling of a platform, or traversing.

As a method of improving the fuel consumption of such an engine power generation device, a method of reducing the rotation speed of the engine power generation device at low load is conceivable. The lower the rotation speed, the more the fuel consumption of the engine power generation device can be reduced. It becomes possible.
However, in such a method, when the rotational speed of the engine power generator is reduced, it becomes impossible to obtain generated power of a specified voltage and frequency, and the generated power from the engine power generator is reduced even when the crane device has a low load. There has been a problem that the operation of various auxiliary equipments provided as ancillary equipment of crane devices such as lighting devices, air conditioning devices, or controllers used is unstable.

  The present invention is intended to solve such problems, and an object of the present invention is to provide a crane apparatus that can stably supply necessary power even when the engine rotational speed is reduced.

  In order to achieve such an object, a crane apparatus according to the present invention includes an engine power generator that supplies driving power by driving a generator by an engine, and an electric motor that is driven by the driving power and loads and unloads luggage. An inverter that converts the voltage and frequency of the driving power and outputs it as auxiliary power, a switch that switches either the driving power or the auxiliary power to the auxiliary equipment of the crane device, and the crane device And a controller for controlling the engine rotation speed of the engine and the switch according to the operation state.

  At this time, if the detected value indicating the engine rotation speed, the drive power voltage, or the drive power frequency of the engine power generator is greater than or equal to a predetermined threshold, the controller switches the switch to control the drive power. If the detected value falls below a predetermined threshold value, the switch may be switched and the auxiliary power may be supplied to the auxiliary equipment.

  In addition, the controller switches the switch based on the operation start operation input from the operator instructing the start of the crane operation to supply drive power to the auxiliary equipment, and from the operator instructing the stop of the crane operation. The switching device may be switched based on the operation stop operation input to supply the auxiliary machine power to the auxiliary equipment.

According to the present invention, the generator of the engine power generator is driven by the engine and supplied with driving power, the voltage and frequency of the driving power are converted by the inverter and output as auxiliary power, and the driving power or auxiliary power is output by the switch. Either one of the mechanical power is switched and supplied to the auxiliary equipment of the crane apparatus, and the controller controls the engine rotation speed and the switch of the engine power generator according to the operation status of the crane apparatus.
Specifically, when the detected value indicating the engine rotation speed of the engine power generator is equal to or greater than a predetermined threshold value, the controller switches the switch to supply drive power to the auxiliary equipment, and the detected value is When the value falls below the predetermined threshold value, the switch is controlled to be switched and the auxiliary power is supplied to the auxiliary equipment.

As a result, even when the driving power having the desired voltage and frequency is not supplied from the generator because the rotational speed of the engine is reduced, the auxiliary power having the desired voltage and frequency is stably supplied from the inverter. Therefore, it is possible to maintain normal operation of auxiliary equipment provided as ancillary equipment of the crane device.
Therefore, the rotational speed of the engine power generation device can be greatly reduced according to the operation status of the crane device, and as a result, the fuel efficiency of the engine power generation device can be effectively reduced and the impact on the environment can also be reduced. It becomes.

  Further, the inverter can usually convert and output the power of the desired voltage and frequency even if the voltage and frequency of the input power change to some extent. In the present invention, the drive power from the engine power generator is converted by the inverter and the auxiliary power is supplied. Therefore, the auxiliary power having the desired frequency and voltage even if the voltage or frequency of the drive power changes linearly. It becomes possible to supply power stably. Therefore, the engine speed of the engine power generator can be changed linearly, and compared with the case where the engine power generator is operated by selecting one of a plurality of fixedly set engine speeds, the engine power generator The fuel consumption can be reduced extremely effectively, and the environmental impact can be further reduced.

Next, embodiments of the present invention will be described with reference to the drawings.
[Configuration of the embodiment]
First, a crane apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a functional block diagram showing a configuration of a crane apparatus according to an embodiment of the present invention.
This crane apparatus is an apparatus that drives electric motors connected to a common bus by supplying electric power generated by driving an engine to the common bus, and loads and unloads luggage. The main winding motor 30, the traveling motors 31, 32, the traversing motor 33, the inverters (INV) 41 to 44, the switch 5, the auxiliary equipment 6, the controller 7, and the common bus 9 are provided.

  The present embodiment includes an engine power generator 1 that supplies driving power by driving a generator by an engine, an inverter 44 that converts the voltage and frequency of the driving power and outputs it as auxiliary power, and driving power or auxiliary power. A switch 5 is provided for switching and supplying either one of the electric power to the auxiliary equipment 6 of the crane apparatus. The controller 7 controls the engine speed of the engine power generator 1 and the switch 5 according to the operation status of the crane apparatus. Is controlled.

Hereinafter, the structure of the crane apparatus concerning this Embodiment is demonstrated in detail.
The engine power generator 1 includes a diesel engine (DE) 11 and a power generator 12, and is a device that generates and outputs AC drive power 15 by driving the power generator (G) 12 with the diesel engine 11. It has a function of controlling the engine rotation speed of the diesel engine 11 based on an operation instruction 10A from the controller 7 indicating the engine rotation speed.
In the engine generator 1, the generator 12 is a driving power having an appropriate voltage and frequency as power used in the auxiliary equipment 6 when the diesel engine 11 is operating at a rotational speed equal to or higher than a threshold value Nth described later. 15 has a function of generating electricity.

The main winding motor 30 is an AC motor for raising and lowering a load. The traveling motors 31 and 42 are AC motors for traveling the gantry. The traverse motor 33 is an AC motor for traversing the gantry.
Inverter 41 is an AC / DC / AC converter that converts drive power 15 on common bus 9 into AC power and supplies it to main winding motor 30 and traveling motor 31.
Inverter 42 is an AC / DC / AC converter that converts drive power 15 on common bus 9 into AC power and supplies it to main winding motor 30 and traveling motor 32.

The inverter 43 is an AC / DC / AC converter that converts the drive power 15 on the common bus 9 into AC power and supplies the AC power to the traverse motor 33.
The inverter 44 is an AC / DC / AC converter that converts the drive power 15 on the common bus 9 into AC power and supplies the AC power to the switch 5.
The switch 5 is a switching device that switches and supplies either the driving power 15 from the common bus 9 or the auxiliary power 16 from the inverter 44 to the auxiliary equipment 6.

  The controller 7 has a microprocessor such as a CPU and its peripheral circuits, and reads and executes the program from a memory provided in the microprocessor or the peripheral circuit, thereby causing the program and the hardware to cooperate with each other. It has various functions for controlling the entire apparatus.

  The main function of the controller 7 is to control the inverters 41 to 43 by exchanging various commands 4A on the basis of the crane operation 70 of the operator detected through the operation lever and the operation switch. Crane operation function for controlling operation such as traveling and traversing of the gantry, power supply status confirmation function for confirming the power supply status from the engine power generator 1 to the common bus 9, and command input 71 and power supply status from the operator There is a rotation speed control function for calculating a new engine rotation speed based on the operation status of the crane apparatus obtained from the above and instructing the engine power generation apparatus 1 by the operation instruction 10A.

The power supply status from the engine power generator 1 to the common bus 9 can be grasped by monitoring the supply voltage of the common bus 9, for example. When hoisting a load, traveling a traversing base, or traversing based on a crane operation, the driving power on the common bus 9 is used when the corresponding electric motors 30 to 33 are driven, so that the supply voltage decreases.
Therefore, the supply voltage of the common bus 9 is detected based on the detection value 15A from the detector provided on the wiring from the engine power generator 1 to the common bus 9, for example, and stored in the memory in advance by the power supply status confirmation function. By reading and comparing the lower and upper threshold values, it is possible to confirm whether the power supply status is excessive or insufficient.

Further, the controller 7 compares, as one of main functions, a detection value indicating the engine rotation speed of the engine power generator 1, the voltage of the driving power 15, or the frequency of the driving power 15 with a predetermined threshold value, It has an auxiliary power switching function for outputting a switching instruction 5A for switching control of the switch 5 according to the comparison result.
At this time, the engine rotation speed of the engine power generation device 1 may be obtained from the operation notification 10B from the engine power generation device 1. The voltage and frequency of the driving power 15 may be detected based on a detection value 15A from a detector provided on the wiring from the engine power generation device 1 to the common bus 9, for example.

[Operation of this embodiment]
Next, with reference to FIGS. 2-4, operation | movement of the crane apparatus concerning one Embodiment of this invention is demonstrated in detail. FIG. 2 is a flowchart showing an engine rotation speed control process of the crane device according to the embodiment of the present invention. FIG. 3 is an operational characteristic showing the relationship between the power generated by the engine power generator and the engine speed. FIG. 4 is a flowchart showing auxiliary power switching processing of the crane device according to the embodiment of the present invention.

[Engine speed control]
First, with reference to FIG. 2 and FIG. 3, the engine rotational speed control in the controller 7 will be described in detail as the operation of the crane device according to the present embodiment.
The controller 7 starts the engine rotation speed control process of FIG. 2 in response to the detection of the operation start operation by the operator.

  First, the controller 7 checks the presence / absence of the command input 71 from the operator using the engine speed control function (step 100). If there is a command input 71 (step 100: YES), the controller 7 inputs the command input 71. The operation instruction 10A indicating the engine rotation speed N corresponding to the load and the command speed is output to the engine power generator 1 (step 101), and the process returns to step 100.

  The engine power generator 1 has operational characteristics as shown in FIG. 3 with respect to the generated power P and the engine rotational speed N. In general, this type of operating characteristic tends to attenuate after the generated power P monotonously increases as the engine speed N increases and reaches a predetermined maximum power value. Therefore, if such operation characteristics are stored in advance in the memory of the controller 7 in the form of a function or a table, the engine speed N required to supply the desired generated power P, that is, the command supply power, can be calculated.

Accordingly, since the command supply power (= load × command speed) can be calculated from the load and the command speed, the engine rotation speed corresponding to the command supply power is calculated with reference to the operation characteristics, and the engine power generation device is determined by the operation instruction 10A. You only need to indicate to 1.
As a result, the diesel engine 11 of the engine power generator 1 is operated at the engine speed N, and the command supply power corresponding to the load and command speed input by the operator is generated by the generator 12.

  On the other hand, when there is no command input 71 from the operator in step 100 (step 100: NO), the controller 7 detects the supply voltage V of the common bus 9 by the power supply status confirmation function (step 102). It is compared with the lower threshold value VL stored in the memory (step 103).

Here, when the supply voltage V is lower than the lower limit threshold VL (step 103: YES), the engine speed acquired by the operation notification 10B from the engine power generator 1 is increased by a predetermined amount, and a new engine speed N is obtained. (Step 104), a driving instruction 10A indicating a new engine speed N is output to the engine power generator 1 (step 107), and the process returns to step 100.
As a result, when the DC power of the common bus 9 is used and the supply voltage is lower than the lower limit threshold, the engine speed of the engine power generator 1 is increased and more generated power is shared. 9 is supplied.

  In step 105, if the supply voltage V is not lower than the lower limit threshold VL (step 103: NO), the power supply status confirmation function determines the upper limit threshold stored in the memory for the supply voltage V of the common bus 9. It is compared with the value VH (step 105).

Here, when the supply voltage V is lower than the upper limit threshold value VH (step 105: YES), the engine speed acquired by the operation notification 10B from the engine power generator 1 is reduced by a predetermined amount, and a new engine speed N is obtained. (Step 106), a driving instruction 10A indicating a new engine speed N is output to the engine power generator 1 (step 107), and the process returns to step 100.
As a result, when the DC power of the common bus 9 is not used and the supply voltage is higher than the upper limit threshold value, the engine speed of the engine power generator 1 is reduced and power generation supplied to the common bus 9 Power is suppressed.

[Auxiliary power switching control]
Next, with reference to FIG. 4, auxiliary power switching control in the controller 7 will be described in detail as the operation of the crane device according to the embodiment of the present invention. Here, a case where the controller 5 switches and controls the switch 5 based on the engine rotation speed of the engine power generator 1 will be described as an example.
The controller 7 starts the auxiliary power switching control process of FIG. 4 in parallel with the engine rotation speed control process of FIG. 2 in response to the detection of the driving start operation by the operator.

First, the controller 7 detects the engine rotation speed N (detected value) of the engine power generator 1 using the operation notification 10B from the engine power generator 1 by the auxiliary power switching function (step 110), and is stored in the memory. The threshold value Nth is compared (step 111).
Here, when the engine speed N is equal to or higher than the threshold value Nth (step 111: YES), the auxiliary machine power switching function outputs a switching instruction 5A for switching control of the switch 5 to the drive power 15 side ( Step 112), and return to Step 110.

At this time, as the threshold value Nth, an engine rotational speed necessary for supplying the driving power 15 having an appropriate voltage and frequency as the power used in the auxiliary equipment 6 from the generator 12 of the engine power generator 1 is used. It is done.
As a result, when the engine speed becomes equal to or higher than the threshold value Nth, the switch 5 is switched to the common bus 9 (H) side, and driving power 15 having an appropriate voltage and frequency is supplied to the auxiliary equipment 6. Is done.

On the other hand, when the engine speed N is lower than the threshold value Nth in step 111 (step 111: NO), the auxiliary machine power switching function is a switching instruction for switching the switch 5 to the auxiliary machine power 16 side. 5A is output (step 113), and the process returns to step 110.
As a result, when the engine rotational speed falls below the threshold value Nth, the switch 5 is switched from the common bus 9 (H) side to the inverter 44 (L) side of the engine power generator 1, and the appropriate voltage and frequency are set. The auxiliary machine electric power 16 is supplied to the auxiliary machine facility 6.

[Operation example of this embodiment]
Next, with reference to FIG. 5, the operation example of the crane apparatus concerning one embodiment of this invention is demonstrated. FIG. 5 is a timing chart showing an operation example of the crane apparatus according to the embodiment of the present invention. Here, an example will be described in which the engine rotation speed of the engine power generation device 1 is increased according to the start of the crane operation, and then the engine rotation speed of the engine power generation device 1 is decreased according to the stop of the crane operation. Note that, as the threshold value Nth for the engine speed, the engine speed Nb at the time of high speed rotation is set in advance in the memory of the controller 7.

  Prior to time T0, the crane operation is not performed, and the diesel engine of the engine power generator 1 is operated at the engine rotation speed Na. At this time, the specified drive power PMa is output from the engine power generator 1. Therefore, since the engine speed N is lower than the threshold value Nth, that is, Nb, the switch 5 is switched to the inverter 44 (L) side by the controller 7, and the auxiliary power 16 from the inverter 44 is supplemented. It is supplied to the machine equipment 6.

Next, when a crane operation 70 indicating a load hoisting instruction is performed at time T0, the controller 7 outputs an operation instruction 10A indicating an engine rotation speed Nb corresponding to the operation instruction to the engine power generator 1. As a result, the engine rotation speed of the engine power generator 1 gradually increases from Na to Nb, and the drive power 15 from the engine power generator 1 increases.
Thereafter, at time T1, the engine speed N reaches Nb and becomes constant, and the maximum drive power PMb is output as the drive power 15.

  Therefore, after time T1, the engine speed N has risen to the threshold value Nth, that is, Nb or more. Therefore, the switch 5 is switched to the common bus 9 (H) side by the controller 7, and the generator 12 Is supplied to the auxiliary equipment 6.

Further, when a crane operation 70 indicating a load lowering command is performed at time T2, the controller 7 outputs an operation instruction 10A indicating the engine rotation speed Na corresponding to the operation command to the engine power generator 1. As a result, the engine rotation speed of the engine power generator 1 gradually decreases from Nb to Na, and the drive power 15 from the engine power generator 1 decreases.
After that, at time T3, the engine speed N reaches Nb and becomes constant, and the specified drive power PMa is output as the drive power 15.

Therefore, after time T3, the engine speed N falls below the threshold value Nth, that is, Nb. Therefore, the switch 5 is switched to the inverter 44 (L) side by the controller 7, and the auxiliary machine from the inverter 44 is Electric power 16 is supplied to the auxiliary equipment 6.
As a result, even when the engine speed N decreases to Nb and the voltage and frequency of the driving power 15 from the generator 12 decrease, the auxiliary power having an appropriate voltage and frequency as the power used in the auxiliary equipment 6 16 is supplied from the inverter 44, and the normal operation of the auxiliary equipment 6 is maintained.

[Effects of the present embodiment]
As described above, in this embodiment, the engine generator 1 having the generator 12 that is driven by the engine and supplies the driving power 15 and the inverter 44 that converts the voltage and frequency of the driving power 15 and outputs the converted power as auxiliary power. And a switch 5 for switching and supplying either the driving power 15 or the auxiliary power 16 to the auxiliary equipment 6 of the crane apparatus, and the engine power generator according to the operation status of the crane apparatus by the controller 7 The engine speed of 1 and the switch 5 are controlled.

  Specifically, when the detected value indicating the engine rotation speed of the engine power generator 1 is equal to or greater than a predetermined threshold value Nth, the controller 7 controls the switch 5 to supply the driving power 15 to the auxiliary equipment 6. When the detected value falls below a predetermined threshold value, the switch 5 is switched and the auxiliary power 16 is supplied to the auxiliary equipment 6.

As a result, even if the driving power 15 having the desired voltage and frequency is not supplied from the generator 12 because the engine rotational speed has been reduced, the auxiliary power 16 having the desired voltage and frequency is supplied from the inverter 44. It can be stably supplied, and normal operation of the auxiliary equipment 6 provided as ancillary equipment of the crane apparatus can be maintained.
Therefore, the rotational speed of the engine power generation device can be greatly reduced according to the operation status of the crane device, and as a result, the fuel efficiency of the engine power generation device can be effectively reduced and the impact on the environment can also be reduced. It becomes.

  Further, the inverter can usually convert and output the power of the desired voltage and frequency even if the voltage and frequency of the input power change to some extent. In the present embodiment, the drive power 15 from the engine power generator 1 is converted by the inverter 44 and the auxiliary power 16 is supplied. Therefore, even if the voltage or frequency of the drive power 15 changes linearly, the desired power is supplied. Auxiliary power 16 having a frequency and a voltage can be stably supplied. Therefore, the engine rotation speed of the engine power generation apparatus 1 can be changed linearly, and the engine power generation apparatus 1 is operated in comparison with the case where the engine power generation apparatus 1 is operated by selecting any one of a plurality of fixedly set engine rotation speeds. The fuel efficiency of the power generation device can be extremely effectively reduced, and the environmental impact can be further reduced.

Further, in the present embodiment, the case where the switching device 5 is controlled to be switched based on the comparison result between the engine rotational speed of the engine power generation device 1 and the threshold value has been described as an example. However, instead of the engine rotational speed, the driving power 15 A voltage or frequency may be used.
Further, the case where the maximum rotational speed Nb is used as the threshold value has been described as an example. However, the present invention is not limited to this. Can be arbitrarily set in accordance with the voltage and frequency of the driving power 15 obtained in the above and the power required for the auxiliary equipment 6.

  Further, in the present embodiment, the case where the switching device 5 is controlled to be switched based on the comparison result between the engine speed of the engine power generation device 1 and the threshold value has been described as an example, but the crane operation starts instead of the engine speed. The switch 5 may be switched based on an operation operation input from an operator who instructs to stop.

  For example, in the case of FIG. 5, when a crane operation 70 indicating a cargo winding command is performed at time T0, the controller 5 is shared by the controller 7 after a predetermined period from time T0 based on this operation operation input. When switching operation to the bus 9 (H) side is performed and a crane operation 70 indicating a load lowering command is performed at time T2, the controller 5 immediately switches the switch 5 to the inverter 44 based on this operation operation input. If switching control is performed to the (L) side, switching control similar to that described above can be realized.

  Note that the arrival period during which the engine speed of the engine power generator 1 reaches the threshold value Nth, here Nb, from Na can be grasped in advance by measurement. Therefore, when the switching device 5 is controlled to be switched to the common bus 9 (H) side, the switching control timing can be accurately determined by measuring the arrival period from the time T0 using the time measuring function of the controller 7.

[Extended embodiment]
In the above embodiment, the switching timing to the driving power 15 side or the auxiliary power 16 side with respect to the switching device 5 has been described as an example of the determination using the same threshold value Nth, but is not limited thereto. Instead of this, a different threshold value Nth may be used according to each switching direction.

  Further, the supply start / stop of the auxiliary power 16 from the inverter 44 may be controlled at a timing before and after the switching control for the switch 5. Specifically, in step 112 of FIG. 4, after switching the switch 5 to the drive power 15 side, the supply of the auxiliary power 16 from the inverter 44 may be stopped by the switching instruction 5 </ b> A from the controller 7. . Further, in step 113 in FIG. 4, the supply of the auxiliary power 16 from the inverter 44 may be started by the switching instruction 5 </ b> A from the controller 7 before the switch 5 is controlled to be switched to the auxiliary power 16. Thereby, in the period when it is not necessary to supply auxiliary machine electric power 16, supply of auxiliary machine electric power 16 or power conversion operation in inverter 44 can be stopped, and useless equipment operation and power consumption can be controlled.

  Moreover, although each embodiment demonstrated as an example the case where the alternating current drive power 15 was supplied from the engine power generation apparatus 1, it is not limited to this, The alternating current drive power is supplied from the engine power generation apparatus 1 Even in this case, each embodiment can be applied in the same manner as described above, and the same effects can be obtained. At this time, a DC generator is used as the generator, a DC / AC converter is used as the inverters 41 to 43, a DC / AC / DC converter is used as the inverter 44, and the switch 5 and the auxiliary equipment 6 are interposed. An inverter including a DC / AC converter may be provided.

It is a functional block diagram which shows the structure of the crane apparatus concerning one embodiment of this invention. It is a flowchart which shows the engine speed control process of the crane apparatus concerning one embodiment of this invention. It is an operating characteristic which shows the relationship between the electric power generated by the engine power generator and the engine speed. It is a flowchart which shows the auxiliary machinery electric power switching process of the crane apparatus concerning one embodiment of this invention. It is a timing chart which shows the operation example of the crane apparatus concerning one embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Engine power generation device, 10A ... Driving instruction, 11 ... Diesel engine, 12 ... Generator, 15 ... Driving power, 16 ... Auxiliary power, 30 ... Main winding motor, 31, 32 ... Traveling motor, 33 ... Traverse motor, 34 ... Load power, 41-44 ... Inverter, 5 ... Switch, 6 ... Auxiliary equipment, 7 ... Controller, 70 ... Crane operation, 71 ... Command input, 9 ... Common bus.

Claims (3)

An engine generator that supplies driving power by driving a generator by an engine;
An electric motor driven by the driving power to load and unload luggage;
An inverter that converts the voltage and frequency of the driving power and outputs it as auxiliary power; and
A switch for switching and supplying either the driving power or the auxiliary power to the auxiliary equipment of the crane device;
A controller for controlling the engine rotation speed of the engine and the switch according to the operation status of the crane device;
A crane apparatus comprising: The crane apparatus according to claim 1,
When the detected value indicating the engine rotation speed of the engine power generation device, the voltage of the driving power, or the frequency of the driving power is equal to or higher than a predetermined threshold, the controller switches the switch to control the driving power. Is supplied to the auxiliary equipment, and when the detected value falls below a predetermined threshold value, the switching device is controlled to supply the auxiliary power to the auxiliary equipment. The crane apparatus according to claim 1,
The controller switches the switch based on an operation start operation input of an operator instructing start of crane operation, supplies the driving power to the auxiliary equipment, and instructs the stop of crane operation. A crane apparatus, wherein the switch is controlled to be switched based on an operation stop operation input from the power supply to supply the auxiliary power to the auxiliary equipment.

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