JP2012121675A - System and method for utilizing regenerative electric power of cargo handling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain a remarkable energy-saving effect, by utilizing regenerative electric power generated in an electric motor of a motor-driven cargo handling device.SOLUTION: This system 100 utilizing the regenerative electric power of an overhead crane 10 utilizes the regenerative electric power generated in the electric motor 24 of the overhead crane 10, at the time of an unloading operation in the overhead crane 10, and the overhead crane 10 is used for cargo handling work of unloading, to a bottom part of a vertical shaft, a material such as a segment for constructing a shield tunnel in the bottom part of the vertical shaft, and includes a utilizing means for supplying the regenerative electric power generated in the electric motor 24, to an electric power consumption line within a construction field such as a water supply pump 32 or the like.

Description

  The present invention relates to a system and method for using regenerative electric power generated by an electric motor of a cargo handling device when the electric cargo handling device is unloaded.

  A crane configured to store the regenerative power generated by the electric motor (motor) of the electric crane in the power storage device for the purpose of reducing the energy consumption of the electric crane used for cargo handling work at construction sites and ports. Control systems are known (see, for example, Patent Documents 1 to 3). In these systems, the regenerative power generated by the electric motor during the crane unloading operation is stored in the power storage device, and the power stored in the power storage device and the power from the commercial power source are consumed during the crane unloading operation.

JP 2007-166775 A JP 2006-225093 A JP-A-9-295793

  As in the crane control systems described in Patent Documents 1 to 3, various studies have been made on using regenerative power for the purpose of reducing energy consumption. However, in any case, the amount of regenerative power generated is very small compared to the amount of power consumed by the crane, so the energy saving effect by using the regenerative power is not significant.

  This invention is made | formed in view of the said situation, and makes it a subject to obtain the remarkable energy saving effect using the regenerative electric power which generate | occur | produces with the electric motor of an electric-type cargo handling apparatus.

  In order to solve the above-described problem, a system for using regenerative power of a cargo handling device according to the present invention provides a regeneration system for a cargo handling device that uses regenerative power generated by an electric motor of the cargo handling device during unloading operation of the electric cargo handling device. An electric power utilization system, wherein the cargo handling device is used for a cargo handling operation for unloading materials for constructing an underground structure at a bottom of a shaft to the bottom of the shaft, and the regenerative power is used for the shaft. Is provided with a utilization means for supplying power to a power consuming system in a construction site where power is supplied, storing power in a power storage device, or supplying power to a power distribution system of a power company.

  In the utilization system of the regenerative power of the cargo handling device, the utilization means may supply the regenerative power to a power consumption system in the construction site.

  Moreover, the utilization system of the regenerative electric power of the said cargo handling apparatus may be provided with the display apparatus which displays the generation amount of the said regenerative electric power.

  Further, the method of using the regenerative power of the cargo handling device according to the present invention is a method of using the regenerative power of the cargo handling device that uses the regenerative power generated by the motor of the cargo handling device during the unloading operation of the electric cargo handling device. The material handling equipment is used for material handling work for unloading the material for constructing an underground structure at the bottom of the shaft to the bottom of the shaft, and the regenerative power is used in a construction site where the shaft is installed. The power is supplied to a power consumption system, is stored in a power storage device, or is supplied to a power provider's distribution system.

  In the method of using regenerative power of the cargo handling device, the cargo handling device may be operated so that the amount of regenerative power generated is greater than the power consumption of the cargo handling device.

  According to the system and method for using the regenerative power of the cargo handling device, a significant energy saving effect can be obtained by using the regenerative power generated by the electric motor of the electric cargo handling device.

It is an elevational sectional view showing a construction site of a shield tunnel employing a regenerative power utilization system according to an embodiment. It is an elevation view showing an overhead crane. It is a block diagram which shows schematic structure of the regenerative electric power utilization system which concerns on one Embodiment. It is a block diagram which shows schematic structure of the regenerative electric power utilization system which concerns on other embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an elevational sectional view showing a construction site of a shield tunnel 1 that employs a regenerative power utilization system (hereinafter referred to as a regenerative power utilization system) 100 (refer to FIG. 3) of an overhead crane 10 according to an embodiment. . As shown in this figure, the overhead crane 10 is installed in the upper part of the shaft 2 and unloads materials and equipment such as segments 3 and floor slabs that constitute the lining surface of the shield tunnel 1 to the bottom of the shaft 2. To do. In the present embodiment, two shield tunneling machines on one side are started from the bottom of the shaft 2 to both sides to construct two shield tunnels 1 penetrating the bottom of the shaft 2. Moreover, the same number of overhead cranes 10 as the shield machine are installed at the upper part of the shaft 2 so as to correspond to each shield machine.

  FIG. 2 is an elevational view showing the overhead crane 10. As shown in this figure, the overhead crane 10 includes a garter 12 installed so as to straddle the upper portion of the shaft 2, a trolley 14 traversing the garter 12, and a hook block 16 suspended from the trolley 14 by a wire 15. And a lifting device 18 that lifts and lowers the hook block 16 by winding and unwinding the wire 15. The elevating device 18 includes a pulley 20 provided on each of the hook block 16 and the trolley 14, a winding drum 22 provided on the trolley 14, and an electric motor (motor) 24 that rotationally drives the winding drum 22.

  During the unloading operation of the overhead crane 10, the winding drum 22 is rotated in the direction of winding the wire 15 by the power running operation of the electric motor 24. On the other hand, when the overhead crane 10 is unloaded, the winding drum 22 is rotated in the direction of unwinding the wire 15 by the load of the suspended load. At this time, the regenerative brake of the electric motor 24 acts on the winding drum 22, so that the winding drum 22 rotates at a low speed, and the suspended load descends at a low speed. The electric motor 24 generates regenerative power.

  FIG. 3 is a block diagram illustrating a schematic configuration of the regenerative power utilization system 100. As shown in this figure, a regenerative power utilization system 100 includes a cubicle type high-voltage power receiving facility (hereinafter referred to as cubicle) 110 that receives high-voltage (for example, 6600 V) power from a power system, and a power distribution unit connected to the cubicle 110. Panels 120 and 122, a control panel 130 connected to the distribution board 120, a motor 24 connected to the control panel 130, and a display device 140 that displays the amount of regenerative power generated from the motor 24 and the like. Yes. In addition to the plurality of overhead cranes 10, the distribution board 120 is connected to a vertical belt conveyor 30 for conveying excavated soil or the like to the ground. In addition, the distribution board 122 is connected to facilities such as a water supply pump 32 and a security light 34 installed in the shaft 2 or in the vicinity of the shaft 2. That is, the cubicle 110 supplies power to loads (power consumption system) such as the overhead crane 10, the vertical belt conveyor 30, the water supply pump 32, the security lighting 34, and the like.

  The cubicle 110 is installed on the ground and accommodates a transformer, a switch, and the like. Electricity received at a high voltage is converted to 400V and converted to the distribution panel 120, and then converted to 200V and transmitted to the distribution panel 122. To do. In addition, the distribution boards 120 and 122 are installed on the ground and accommodate an earth leakage breaker or the like. The distribution board 120 distributes the received AC of 400V to the control panel 130 and other connected 400V system facilities, and the distribution board 122 supplies the received 200V AC to the water supply pump 32 and security lighting. Distributes electricity to equipment of 200V system such as 34.

  The control panel 130 is installed on the garter 12 of the overhead crane 10 and accommodates a PWM cycloconverter 132 (matrix converter), a watt hour meter, and the like. The PWM cycloconverter 132 is an AC / AC converter including a main circuit unit composed of a small input filter and a plurality of bidirectional switches. An AC voltage of a three-phase AC power source is converted into an arbitrary voltage by PWM control. -It converts directly into the alternating voltage of a frequency, outputs it to the electric motor 24, and recirculates the regenerated electric power which generate | occur | produced in the electric motor 24 to the alternating current power supply side.

  The display device 140 is installed on the ground and connected to a watt hour meter provided on the control panel 130 or the like, and the current power consumption (kWh) and power amount of the entire power consumption system measured by the watt hour meter. The current regenerative power amount (kWh) of the electric motor 24 measured by the meter and the maximum demand power amount (maximum demand) (kWh) of the entire power consumption system are displayed.

  By the way, 400 V equipment such as another overhead crane 10 and the vertical belt conveyor 30 is connected to the control panel 130 via the distribution board 120, and is generated by the electric motor 24 as indicated by an arrow in the figure. The regenerative electric power is supplied to the other overhead crane 10 in operation and the vertical belt conveyor 30 in operation. The control panel 130 is connected to 200V equipment such as the water supply pump 32 and the security lighting 34 via the distribution board 120, the cubicle 110, and the distribution board 122. As shown by arrows in the figure, The regenerative electric power generated by the regenerative operation of the electric motor 24 is transformed to 200V by the transformer of the cubicle 110 and then supplied to the operating 200V equipment. In other words, the regenerative power utilization system 100 includes utilization means for supplying regenerative power to the power consumption system in the construction site where the shaft 2 is provided.

  Here, as an example of the capacity (kW) of equipment distributed from the cubicle 110, the total capacity of 400V equipment such as the overhead crane 10 and the vertical belt conveyor 30 is 615 kW, such as the water supply pump 32 and the security lighting 34. The total capacity of the 200V equipment is 193.4 kW, and the total capacity thereof, that is, the total capacity of the equipment distributed from the cubicle 110 is 808.4 kW. On the other hand, the capacity of the electric motor 24 of the overhead crane 10 is 90 kW, which is smaller than the total capacity of facilities distributed from the cubicle 110.

  Thus, the capacity of the load connected to the electric motor 24 that generates regenerative power is much larger than the capacity of the electric motor 24, which is sufficient for the regenerative capacity of the entire power consumption system connected to the cubicle 110. Afford. Therefore, all the regenerative power generated in the motor 24 can be consumed by the power consumption system connected to the motor 24, and no power is thrown away without being used. Can be reduced.

  In particular, in this embodiment, since the shield tunnel 1 is constructed at the bottom of the vertical shaft 2, materials such as the segment 3 and the floor slab are lowered to the bottom of the vertical shaft 2 by the unloading operation of the overhead crane 10, and the ceiling The operation of hoisting the crane 10 in an empty state is repeated. As described above, since the earth and sand generated by the excavation of the shield machine by the shield machine is transported to the ground by the vertical belt conveyor 30, it is not lifted by the overhead crane 10.

  When the overhead crane 10 is lowered, the potential energy corresponding to the weight of the suspended load is regenerated as electric energy from the electric motor 24. When the overhead crane 10 is lowered, the suspended load such as the segment 3 is often present. When the crane 10 is hoisted, electric energy is consumed by the electric motor 24 as kinetic energy corresponding to the weight of the hoisted load. For this reason, in the overhead crane 10, the amount of regenerative electric power generated from the electric motor 24 exceeds the electric power consumption in the electric motor 24, and surplus electric power that is not consumed in the overhead crane 10 is generated. And the regenerative electric power which is surplus electric power which generate | occur | produces in large quantities in the overhead crane 10 is supplied to the equipment of electric power consumption systems, such as another overhead crane 10 and the water supply pump 32, and is consumed. Thereby, the power consumption of the whole power consumption system can be reduced more effectively, and a remarkable energy saving effect can be obtained.

  In the present embodiment, the regenerative power generated in the electric motor 24 is not stored in the power storage device but is consumed in the power consumption system connected to the electric motor 24, so that a capacitor, a battery, etc. The cost for installing the power storage device can be reduced.

  In this embodiment, the PWM cycloconverter 132 having both functions of the inverter and the power regeneration converter is provided in the control panel 130, so that space can be saved as compared with the case where the inverter and the converter are provided separately, and the control is performed. The board 130 can be reduced in size. Moreover, since there is no diode that is a component of the inverter, generation of harmonics can be prevented. Furthermore, since the PWM cycloconverter 132 generally has a higher regenerative efficiency than the regenerative converter, the regenerative power from the electric motor 24 can be efficiently recovered.

  In the present embodiment, the amount of regenerative power generated from the electric motor 24 is displayed on the display device 140. The display device 140 displays the current power consumption amount and the maximum demand power amount of the entire power consumption system. Thereby, the consciousness with respect to energy saving of an operator etc. can be raised. In addition, the operator and the like can adjust the power consumption of the entire power consumption system so as not to exceed the maximum demand power amount in consideration of the amount of regenerative power generated.

  FIG. 4 is a block diagram illustrating a schematic configuration of a regenerative power utilization system 200 according to another embodiment. As shown in this figure, the regenerative power utilization system 200 includes a control panel 230 instead of the control panel 130 described above. The control panel 230 includes an AC / DC converter 232, an inverter 234, a regeneration converter 235, a power storage device 236 such as a capacitor or a battery, and a control device 238. The AC / DC converter 232 converts 400V alternating current into direct current and outputs the direct current to the inverter 234. The inverter 234 converts the direct current converted by the AC / DC converter 232 into alternating current of arbitrary voltage / frequency and outputs it to the electric motor 24, and is generated by the regenerative operation of the electric motor 24 as shown by the solid line arrow in the figure. The alternating current converted into direct current is stored in the power storage device 236. Further, as indicated by a chain line arrow in the figure, regeneration converter 235 is connected in parallel with inverter 234 and recirculates the alternating current generated by the regeneration operation of electric motor 24 to the power supply side.

  Control device 238 switches the power supply path to electric motor 24 in accordance with the remaining capacity of power storage device 236. For example, when the remaining capacity of the power storage device 236 is equal to or greater than a predetermined threshold, the control device 238 switches to power supply from the power storage device 236 to the motor 24, and the remaining capacity of the power storage device 236 is less than the predetermined threshold. In addition, power is switched from the cubicle 110 to the electric motor 24.

  Further, the control device 238 switches the supply path of the regenerative power from the electric motor 24 according to the remaining capacity of the power storage device 236 and the power consumption of the power consumption system. For example, when the power storage device 236 is in a fully charged state, the control device 238 receives power from the electric motor 24 to the electric utility distribution system 240 via the regenerative converter 235 as indicated by a chain line arrow in the figure. Switch to supply. Further, the control device 238 switches the power supply from the electric motor 24 to the power consumption system in the field via the regeneration converter 235 when the power consumption of the power consumption system in the field becomes equal to or greater than a predetermined threshold value. . Thereby, it can suppress that the electric power consumption of the electric power consumption system in a field exceeds the maximum demand electric energy.

  In this way, the regenerative power utilization system 200 supplies regenerative power to the power consumption system in the construction site where the shaft 2 is provided, stores the regenerative power in the power storage device 236, and supplies it to the power distribution system 240 of the power company. Means.

  Here, also in the present embodiment, as in the above-described embodiment, there are many cases where there is a suspended load such as the segment 3 when the overhead crane 10 is lowered, while there is no suspended load when the overhead crane 10 is rolled up. Therefore, the amount of regenerative power generated from the motor 24 exceeds the amount of power consumed by the motor 24. Therefore, the amount of power stored in the power storage device 236 can be maintained at a high level. Further, regenerative power exceeding the storage capacity of the power storage device 236 is consumed in the field or sold to the power company by supplying it to the power consumption system in the field connected to the electric motor 24 or the distribution system 240 of the power company. Or can be electrified. As described above, a remarkable energy saving effect can be obtained.

  In addition, the above-mentioned embodiment is for making an understanding of this invention easy, and does not limit this invention. It goes without saying that the present invention can be changed and improved without departing from the gist thereof, and that the present invention includes equivalents thereof.

  For example, in each of the above-described embodiments, the present invention has been described by taking the shield tunnel 1 as an example of an underground structure to be constructed at the bottom of the shaft 2, but other underground structures such as a case where the shaft itself is an underground structure. The present invention can also be applied when constructing an object. Moreover, although the present invention has been described by taking the overhead crane 10 as an example of the electric cargo handling device, the present invention can also be applied to the case where other electric cargo handling devices such as winches are used.

DESCRIPTION OF SYMBOLS 1 Shield tunnel (underground structure), 2 shafts, 3 segments (materials), 10 Overhead crane (handling device), 12 Garter, 14 Trolley, 15 Wire, 16 Hook block, 18 Lifting device, 20 Pulley, 22 Winding drum, 24 electric motor, 30 vertical belt conveyor, 32 water supply pump, 34 security lighting, 100 regenerative power utilization system, 110 cubicle, 120, 122 distribution panel, 130 control panel, 132 PWM cycloconverter, 140 display device, 230 control panel, 232 AC / DC converter, 234 inverter, 235 regenerative converter, 236 power storage device, 238 control device, 240 distribution system of electric power company

Claims (5)

A system for using regenerative power of a cargo handling device that uses regenerative power generated by an electric motor of the cargo handling device during unloading operation of the electric cargo handling device,
The cargo handling device is used for cargo handling work for unloading materials for constructing an underground structure at the bottom of a shaft to the bottom of the shaft,
Supplying the regenerative power to a power consuming system in a construction site where the shaft is provided, storing the regenerative power in a power storage device, or using a supply means for supplying to a power distribution system of a power company Regenerative power usage system.   The said utilization means supplies the said regenerative electric power to the electric power consumption system in the said construction site, The utilization system of the regenerative electric power of the cargo handling apparatus of Claim 1 characterized by the above-mentioned.   The utilization system of the regenerative electric power of the cargo handling apparatus of Claim 1 or Claim 2 provided with the display apparatus which displays the generation amount of the said regenerative electric power. A method of using regenerative power of a cargo handling device that uses regenerative power generated by an electric motor of the cargo handling device during unloading operation of an electric cargo handling device,
The material handling equipment is used for material handling work for unloading the material for constructing an underground structure at the bottom of the shaft to the bottom of the shaft,
Supplying the regenerative power to a power consumption system in a construction site where the vertical shaft is provided, storing the regenerative power in a power storage device, or supplying the regenerative power to a power provider's power distribution system, Method.   The method for using regenerative power of a cargo handling device according to claim 4, wherein the cargo handling device is operated so that the amount of generated regenerative power is greater than the power consumption of the cargo handling device.

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